channels/chan_zap.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 1999 - 2006, Digium, Inc.
   5  *
   6  * Mark Spencer <markster@digium.com>
   7  *
   8  * See http://www.asterisk.org for more information about
   9  * the Asterisk project. Please do not directly contact
  10  * any of the maintainers of this project for assistance;
  11  * the project provides a web site, mailing lists and IRC
  12  * channels for your use.
  13  *
  14  * This program is free software, distributed under the terms of
  15  * the GNU General Public License Version 2. See the LICENSE file
  16  * at the top of the source tree.
  17  */
  18
  19 /*! \file
  20  *
  21  * \brief Zaptel Pseudo TDM interface
  22  *
  23  * \author Mark Spencer <markster@digium.com>
  24  *
  25  * Connects to the zaptel telephony library as well as
  26  * libpri. Libpri is optional and needed only if you are
  27  * going to use ISDN connections.
  28  *
  29  * You need to install libraries before you attempt to compile
  30  * and install the zaptel channel.
  31  *
  32  * \par See also
  33  * \arg \ref Config_zap
  34  *
  35  * \ingroup channel_drivers
  36  *
  37  * \todo Deprecate the "musiconhold" configuration option post 1.4
  38  */
  39
  40 /*** MODULEINFO
  41         <depend>res_smdi</depend>
  42         <depend>zaptel_vldtmf</depend>
  43         <depend>zaptel</depend>
  44         <depend>tonezone</depend>
  45         <use>pri</use>
  46         <use>ss7</use>
  47  ***/
  48
  49 #include "asterisk.h"
  50
  51 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  52
  53 #include <stdio.h>
  54 #include <string.h>
  55 #ifdef __NetBSD__
  56 #include <pthread.h>
  57 #include <signal.h>
  58 #else
  59 #include <sys/signal.h>
  60 #endif
  61 #include <errno.h>
  62 #include <stdlib.h>
  63 #if !defined(SOLARIS) && !defined(__FreeBSD__)
  64 #include <stdint.h>
  65 #endif
  66 #include <unistd.h>
  67 #include <sys/ioctl.h>
  68 #include <math.h>
  69 #include <ctype.h>
  70 #include "asterisk/zapata.h"
  71
  72 #ifdef HAVE_PRI
  73 #include <libpri.h>
  74 #endif
  75
  76 #ifdef HAVE_SS7
  77 #include <libss7.h>
  78 #endif
  79
  80 #include "asterisk/lock.h"
  81 #include "asterisk/channel.h"
  82 #include "asterisk/config.h"
  83 #include "asterisk/logger.h"
  84 #include "asterisk/module.h"
  85 #include "asterisk/pbx.h"
  86 #include "asterisk/options.h"
  87 #include "asterisk/file.h"
  88 #include "asterisk/ulaw.h"
  89 #include "asterisk/alaw.h"
  90 #include "asterisk/callerid.h"
  91 #include "asterisk/adsi.h"
  92 #include "asterisk/cli.h"
  93 #include "asterisk/cdr.h"
  94 #include "asterisk/features.h"
  95 #include "asterisk/musiconhold.h"
  96 #include "asterisk/say.h"
  97 #include "asterisk/tdd.h"
  98 #include "asterisk/app.h"
  99 #include "asterisk/dsp.h"
 100 #include "asterisk/astdb.h"
 101 #include "asterisk/manager.h"
 102 #include "asterisk/causes.h"
 103 #include "asterisk/term.h"
 104 #include "asterisk/utils.h"
 105 #include "asterisk/transcap.h"
 106 #include "asterisk/stringfields.h"
 107 #include "asterisk/abstract_jb.h"
 108 #include "asterisk/smdi.h"
 109 #include "asterisk/astobj.h"
 110 #include "asterisk/event.h"
 111
 112 #define SMDI_MD_WAIT_TIMEOUT 1500 /* 1.5 seconds */
 113
 114 #ifdef ZT_SPANINFO_HAS_LINECONFIG
 115 static const char *lbostr[] = {
 116 "0 db (CSU)/0-133 feet (DSX-1)",
 117 "133-266 feet (DSX-1)",
 118 "266-399 feet (DSX-1)",
 119 "399-533 feet (DSX-1)",
 120 "533-655 feet (DSX-1)",
 121 "-7.5db (CSU)",
 122 "-15db (CSU)",
 123 "-22.5db (CSU)"
 124 };
 125 #endif
 126
 127 /*! Global jitterbuffer configuration - by default, jb is disabled */
 128 static struct ast_jb_conf default_jbconf =
 129 {
 130         .flags = 0,
 131         .max_size = -1,
 132         .resync_threshold = -1,
 133         .impl = ""
 134 };
 135 static struct ast_jb_conf global_jbconf;
 136
 137 #if !defined(ZT_SIG_EM_E1) || (defined(HAVE_PRI) && !defined(ZT_SIG_HARDHDLC))
 138 #error "Your zaptel is too old.  Please update"
 139 #endif
 140
 141 #ifndef ZT_TONEDETECT
 142 /* Work around older code with no tone detect */
 143 #define ZT_EVENT_DTMFDOWN 0
 144 #define ZT_EVENT_DTMFUP 0
 145 #endif
 146
 147 /* define this to send PRI user-user information elements */
 148 #undef SUPPORT_USERUSER
 149
 150 /*!
 151  * \note Define ZHONE_HACK to cause us to go off hook and then back on hook when
 152  * the user hangs up to reset the state machine so ring works properly.
 153  * This is used to be able to support kewlstart by putting the zhone in
 154  * groundstart mode since their forward disconnect supervision is entirely
 155  * broken even though their documentation says it isn't and their support
 156  * is entirely unwilling to provide any assistance with their channel banks
 157  * even though their web site says they support their products for life.
 158  */
 159 /* #define ZHONE_HACK */
 160
 161 /*! \note
 162  * Define if you want to check the hook state for an FXO (FXS signalled) interface
 163  * before dialing on it.  Certain FXO interfaces always think they're out of
 164  * service with this method however.
 165  */
 166 /* #define ZAP_CHECK_HOOKSTATE */
 167
 168 /*! \brief Typically, how many rings before we should send Caller*ID */
 169 #define DEFAULT_CIDRINGS 1
 170
 171 #define CHANNEL_PSEUDO -12
 172
 173 #define AST_LAW(p) (((p)->law == ZT_LAW_ALAW) ? AST_FORMAT_ALAW : AST_FORMAT_ULAW)
 174
 175 /*! \brief Signaling types that need to use MF detection should be placed in this macro */
 176 #define NEED_MFDETECT(p) (((p)->sig == SIG_FEATDMF) || ((p)->sig == SIG_FEATDMF_TA) || ((p)->sig == SIG_E911) || ((p)->sig == SIG_FGC_CAMA) || ((p)->sig == SIG_FGC_CAMAMF) || ((p)->sig == SIG_FEATB))
 177
 178 static const char tdesc[] = "Zapata Telephony Driver"
 179 #ifdef HAVE_PRI
 180                " w/PRI"
 181 #endif
 182 #ifdef HAVE_SS7
 183                " w/SS7"
 184 #endif
 185 ;
 186
 187 static const char config[] = "zapata.conf";
 188
 189 #define SIG_EM          ZT_SIG_EM
 190 #define SIG_EMWINK      (0x0100000 | ZT_SIG_EM)
 191 #define SIG_FEATD       (0x0200000 | ZT_SIG_EM)
 192 #define SIG_FEATDMF     (0x0400000 | ZT_SIG_EM)
 193 #define SIG_FEATB       (0x0800000 | ZT_SIG_EM)
 194 #define SIG_E911        (0x1000000 | ZT_SIG_EM)
 195 #define SIG_FEATDMF_TA  (0x2000000 | ZT_SIG_EM)
 196 #define SIG_FGC_CAMA    (0x4000000 | ZT_SIG_EM)
 197 #define SIG_FGC_CAMAMF  (0x8000000 | ZT_SIG_EM)
 198 #define SIG_FXSLS       ZT_SIG_FXSLS
 199 #define SIG_FXSGS       ZT_SIG_FXSGS
 200 #define SIG_FXSKS       ZT_SIG_FXSKS
 201 #define SIG_FXOLS       ZT_SIG_FXOLS
 202 #define SIG_FXOGS       ZT_SIG_FXOGS
 203 #define SIG_FXOKS       ZT_SIG_FXOKS
 204 #define SIG_PRI         ZT_SIG_CLEAR
 205 #define SIG_SS7         (0x1000000 | ZT_SIG_CLEAR)
 206 #define SIG_SF          ZT_SIG_SF
 207 #define SIG_SFWINK      (0x0100000 | ZT_SIG_SF)
 208 #define SIG_SF_FEATD    (0x0200000 | ZT_SIG_SF)
 209 #define SIG_SF_FEATDMF  (0x0400000 | ZT_SIG_SF)
 210 #define SIG_SF_FEATB    (0x0800000 | ZT_SIG_SF)
 211 #define SIG_EM_E1       ZT_SIG_EM_E1
 212 #define SIG_GR303FXOKS  (0x0100000 | ZT_SIG_FXOKS)
 213 #define SIG_GR303FXSKS  (0x0100000 | ZT_SIG_FXSKS)
 214
 215 #define NUM_SPANS               32
 216 #define NUM_DCHANS              4       /*!< No more than 4 d-channels */
 217 #define MAX_CHANNELS    672             /*!< No more than a DS3 per trunk group */
 218
 219 #define CHAN_PSEUDO     -2
 220
 221 #define DCHAN_PROVISIONED (1 << 0)
 222 #define DCHAN_NOTINALARM  (1 << 1)
 223 #define DCHAN_UP          (1 << 2)
 224
 225 #define DCHAN_AVAILABLE (DCHAN_PROVISIONED | DCHAN_NOTINALARM | DCHAN_UP)
 226
 227 /* Overlap dialing option types */
 228 #define ZAP_OVERLAPDIAL_NONE 0
 229 #define ZAP_OVERLAPDIAL_OUTGOING 1
 230 #define ZAP_OVERLAPDIAL_INCOMING 2
 231 #define ZAP_OVERLAPDIAL_BOTH (ZAP_OVERLAPDIAL_INCOMING|ZAP_OVERLAPDIAL_OUTGOING)
 232
 233 static char defaultcic[64] = "";
 234 static char defaultozz[64] = "";
 235
 236 static char progzone[10] = "";
 237
 238 static int usedistinctiveringdetection = 0;
 239 static int distinctiveringaftercid = 0;
 240
 241 static int numbufs = 4;
 242
 243 #ifdef HAVE_PRI
 244 static struct ast_channel inuse;
 245 #ifdef PRI_GETSET_TIMERS
 246 static int pritimers[PRI_MAX_TIMERS];
 247 #endif
 248 static int pridebugfd = -1;
 249 static char pridebugfilename[1024] = "";
 250 #endif
 251
 252 /*! \brief Wait up to 16 seconds for first digit (FXO logic) */
 253 static int firstdigittimeout = 16000;
 254
 255 /*! \brief How long to wait for following digits (FXO logic) */
 256 static int gendigittimeout = 8000;
 257
 258 /*! \brief How long to wait for an extra digit, if there is an ambiguous match */
 259 static int matchdigittimeout = 3000;
 260
 261 /*! \brief Protect the interface list (of zt_pvt's) */
 262 AST_MUTEX_DEFINE_STATIC(iflock);
 263
 264
 265 static int ifcount = 0;
 266
 267 #ifdef HAVE_PRI
 268 AST_MUTEX_DEFINE_STATIC(pridebugfdlock);
 269 #endif
 270
 271 /*! \brief Protect the monitoring thread, so only one process can kill or start it, and not
 272    when it's doing something critical. */
 273 AST_MUTEX_DEFINE_STATIC(monlock);
 274
 275 /*! \brief This is the thread for the monitor which checks for input on the channels
 276    which are not currently in use. */
 277 static pthread_t monitor_thread = AST_PTHREADT_NULL;
 278
 279 static int restart_monitor(void);
 280
 281 static enum ast_bridge_result zt_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags, struct ast_frame **fo, struct ast_channel **rc, int timeoutms);
 282
 283 static int zt_sendtext(struct ast_channel *c, const char *text);
 284
 285 static void mwi_event_cb(const struct ast_event *event, void *userdata)
 286 {
 287         /* This module does not handle MWI in an event-based manner.  However, it
 288          * subscribes to MWI for each mailbox that is configured so that the core
 289          * knows that we care about it.  Then, chan_zap will get the MWI from the
 290          * event cache instead of checking the mailbox directly. */
 291 }
 292
 293 /*! \brief Avoid the silly zt_getevent which ignores a bunch of events */
 294 static inline int zt_get_event(int fd)
 295 {
 296         int j;
 297         if (ioctl(fd, ZT_GETEVENT, &j) == -1)
 298                 return -1;
 299         return j;
 300 }
 301
 302 /*! \brief Avoid the silly zt_waitevent which ignores a bunch of events */
 303 static inline int zt_wait_event(int fd)
 304 {
 305         int i, j = 0;
 306         i = ZT_IOMUX_SIGEVENT;
 307         if (ioctl(fd, ZT_IOMUX, &i) == -1)
 308                 return -1;
 309         if (ioctl(fd, ZT_GETEVENT, &j) == -1)
 310                 return -1;
 311         return j;
 312 }
 313
 314 /*! Chunk size to read -- we use 20ms chunks to make things happy. */
 315 #define READ_SIZE 160
 316
 317 #define MASK_AVAIL              (1 << 0)        /*!< Channel available for PRI use */
 318 #define MASK_INUSE              (1 << 1)        /*!< Channel currently in use */
 319
 320 #define CALLWAITING_SILENT_SAMPLES      ( (300 * 8) / READ_SIZE) /*!< 300 ms */
 321 #define CALLWAITING_REPEAT_SAMPLES      ( (10000 * 8) / READ_SIZE) /*!< 300 ms */
 322 #define CIDCW_EXPIRE_SAMPLES            ( (500 * 8) / READ_SIZE) /*!< 500 ms */
 323 #define MIN_MS_SINCE_FLASH                      ( (2000) )      /*!< 2000 ms */
 324 #define DEFAULT_RINGT                           ( (8000 * 8) / READ_SIZE)
 325
 326 struct zt_pvt;
 327
 328 static int ringt_base = DEFAULT_RINGT;
 329
 330 #ifdef HAVE_SS7
 331
 332 #define LINKSTATE_INALARM       (1 << 0)
 333 #define LINKSTATE_STARTING      (1 << 1)
 334 #define LINKSTATE_UP            (1 << 2)
 335 #define LINKSTATE_DOWN          (1 << 3)
 336
 337 #define SS7_NAI_DYNAMIC         -1
 338
 339 struct zt_ss7 {
 340         pthread_t master;                                               /*!< Thread of master */
 341         ast_mutex_t lock;
 342         int fds[NUM_DCHANS];
 343         int numsigchans;
 344         int linkstate[NUM_DCHANS];
 345         int numchans;
 346         int type;
 347         enum {
 348                 LINKSET_STATE_DOWN = 0,
 349                 LINKSET_STATE_UP
 350         } state;
 351         char called_nai;                                                /*!< Called Nature of Address Indicator */
 352         char calling_nai;                                               /*!< Calling Nature of Address Indicator */
 353         char internationalprefix[10];                                   /*!< country access code ('00' for european dialplans) */
 354         char nationalprefix[10];                                        /*!< area access code ('0' for european dialplans) */
 355         char subscriberprefix[20];                                      /*!< area access code + area code ('0'+area code for european dialplans) */
 356         char unknownprefix[20];                                         /*!< for unknown dialplans */
 357         struct ss7 *ss7;
 358         struct zt_pvt *pvts[MAX_CHANNELS];                              /*!< Member channel pvt structs */
 359 };
 360
 361 static struct zt_ss7 linksets[NUM_SPANS];
 362
 363 static int cur_ss7type = -1;
 364 static int cur_linkset = -1;
 365 static int cur_pointcode = -1;
 366 static int cur_cicbeginswith = -1;
 367 static int cur_adjpointcode = -1;
 368 static int cur_networkindicator = -1;
 369 static int cur_defaultdpc = -1;
 370 #endif /* HAVE_SS7 */
 371
 372 #ifdef HAVE_PRI
 373
 374 #define PVT_TO_CHANNEL(p) (((p)->prioffset) | ((p)->logicalspan << 8) | (p->pri->mastertrunkgroup ? 0x10000 : 0))
 375 #define PRI_CHANNEL(p) ((p) & 0xff)
 376 #define PRI_SPAN(p) (((p) >> 8) & 0xff)
 377 #define PRI_EXPLICIT(p) (((p) >> 16) & 0x01)
 378
 379 struct zt_pri {
 380         pthread_t master;                                               /*!< Thread of master */
 381         ast_mutex_t lock;                                               /*!< Mutex */
 382         char idleext[AST_MAX_EXTENSION];                                /*!< Where to idle extra calls */
 383         char idlecontext[AST_MAX_CONTEXT];                              /*!< What context to use for idle */
 384         char idledial[AST_MAX_EXTENSION];                               /*!< What to dial before dumping */
 385         int minunused;                                                  /*!< Min # of channels to keep empty */
 386         int minidle;                                                    /*!< Min # of "idling" calls to keep active */
 387         int nodetype;                                                   /*!< Node type */
 388         int switchtype;                                                 /*!< Type of switch to emulate */
 389         int nsf;                                                        /*!< Network-Specific Facilities */
 390         int dialplan;                                                   /*!< Dialing plan */
 391         int localdialplan;                                              /*!< Local dialing plan */
 392         char internationalprefix[10];                                   /*!< country access code ('00' for european dialplans) */
 393         char nationalprefix[10];                                        /*!< area access code ('0' for european dialplans) */
 394         char localprefix[20];                                           /*!< area access code + area code ('0'+area code for european dialplans) */
 395         char privateprefix[20];                                         /*!< for private dialplans */
 396         char unknownprefix[20];                                         /*!< for unknown dialplans */
 397         int dchannels[NUM_DCHANS];                                      /*!< What channel are the dchannels on */
 398         int trunkgroup;                                                 /*!< What our trunkgroup is */
 399         int mastertrunkgroup;                                           /*!< What trunk group is our master */
 400         int prilogicalspan;                                             /*!< Logical span number within trunk group */
 401         int numchans;                                                   /*!< Num of channels we represent */
 402         int overlapdial;                                                /*!< In overlap dialing mode */
 403         int facilityenable;                                             /*!< Enable facility IEs */
 404         struct pri *dchans[NUM_DCHANS];                                 /*!< Actual d-channels */
 405         int dchanavail[NUM_DCHANS];                                     /*!< Whether each channel is available */
 406         struct pri *pri;                                                /*!< Currently active D-channel */
 407         int debug;
 408         int fds[NUM_DCHANS];                                            /*!< FD's for d-channels */
 409         int offset;
 410         int span;
 411         int resetting;
 412         int resetpos;
 413         time_t lastreset;                                               /*!< time when unused channels were last reset */
 414         long resetinterval;                                             /*!< Interval (in seconds) for resetting unused channels */
 415         struct zt_pvt *pvts[MAX_CHANNELS];                              /*!< Member channel pvt structs */
 416         struct zt_pvt *crvs;                                            /*!< Member CRV structs */
 417         struct zt_pvt *crvend;                                          /*!< Pointer to end of CRV structs */
 418 };
 419
 420
 421 static struct zt_pri pris[NUM_SPANS];
 422
 423 #if 0
 424 #define DEFAULT_PRI_DEBUG (PRI_DEBUG_Q931_DUMP | PRI_DEBUG_Q921_DUMP | PRI_DEBUG_Q921_RAW | PRI_DEBUG_Q921_STATE)
 425 #else
 426 #define DEFAULT_PRI_DEBUG 0
 427 #endif
 428
 429 static inline void pri_rel(struct zt_pri *pri)
 430 {
 431         ast_mutex_unlock(&pri->lock);
 432 }
 433
 434 #else
 435 /*! Shut up the compiler */
 436 struct zt_pri;
 437 #endif
 438
 439 #define SUB_REAL        0                       /*!< Active call */
 440 #define SUB_CALLWAIT    1                       /*!< Call-Waiting call on hold */
 441 #define SUB_THREEWAY    2                       /*!< Three-way call */
 442
 443 /* Polarity states */
 444 #define POLARITY_IDLE   0
 445 #define POLARITY_REV    1
 446
 447
 448 static struct zt_distRings drings;
 449
 450 struct distRingData {
 451         int ring[3];
 452         int range;
 453 };
 454 struct ringContextData {
 455         char contextData[AST_MAX_CONTEXT];
 456 };
 457 struct zt_distRings {
 458         struct distRingData ringnum[3];
 459         struct ringContextData ringContext[3];
 460 };
 461
 462 static char *subnames[] = {
 463         "Real",
 464         "Callwait",
 465         "Threeway"
 466 };
 467
 468 struct zt_subchannel {
 469         int zfd;
 470         struct ast_channel *owner;
 471         int chan;
 472         short buffer[AST_FRIENDLY_OFFSET/2 + READ_SIZE];
 473         struct ast_frame f;             /*!< One frame for each channel.  How did this ever work before? */
 474         unsigned int needringing:1;
 475         unsigned int needbusy:1;
 476         unsigned int needcongestion:1;
 477         unsigned int needcallerid:1;
 478         unsigned int needanswer:1;
 479         unsigned int needflash:1;
 480         unsigned int needhold:1;
 481         unsigned int needunhold:1;
 482         unsigned int linear:1;
 483         unsigned int inthreeway:1;
 484         ZT_CONFINFO curconf;
 485 };
 486
 487 #define CONF_USER_REAL          (1 << 0)
 488 #define CONF_USER_THIRDCALL     (1 << 1)
 489
 490 #define MAX_SLAVES      4
 491
 492 static struct zt_pvt {
 493         ast_mutex_t lock;
 494         struct ast_channel *owner;                      /*!< Our current active owner (if applicable) */
 495                                                         /*!< Up to three channels can be associated with this call */
 496
 497         struct zt_subchannel sub_unused;                /*!< Just a safety precaution */
 498         struct zt_subchannel subs[3];                   /*!< Sub-channels */
 499         struct zt_confinfo saveconf;                    /*!< Saved conference info */
 500
 501         struct zt_pvt *slaves[MAX_SLAVES];              /*!< Slave to us (follows our conferencing) */
 502         struct zt_pvt *master;                          /*!< Master to us (we follow their conferencing) */
 503         int inconference;                               /*!< If our real should be in the conference */
 504
 505         int sig;                                        /*!< Signalling style */
 506         int radio;                                      /*!< radio type */
 507         int outsigmod;                                  /*!< Outbound Signalling style (modifier) */
 508         int oprmode;                                    /*!< "Operator Services" mode */
 509         struct zt_pvt *oprpeer;                         /*!< "Operator Services" peer tech_pvt ptr */
 510         float cid_rxgain;                                       /*!< "Gain to apply during caller id */
 511         float rxgain;
 512         float txgain;
 513         int tonezone;                                   /*!< tone zone for this chan, or -1 for default */
 514         struct zt_pvt *next;                            /*!< Next channel in list */
 515         struct zt_pvt *prev;                            /*!< Prev channel in list */
 516
 517         /* flags */
 518         unsigned int adsi:1;
 519         unsigned int answeronpolarityswitch:1;
 520         unsigned int busydetect:1;
 521         unsigned int callreturn:1;
 522         unsigned int callwaiting:1;
 523         unsigned int callwaitingcallerid:1;
 524         unsigned int cancallforward:1;
 525         unsigned int canpark:1;
 526         unsigned int confirmanswer:1;                   /*!< Wait for '#' to confirm answer */
 527         unsigned int destroy:1;
 528         unsigned int didtdd:1;                          /*!< flag to say its done it once */
 529         unsigned int dialednone:1;
 530         unsigned int dialing:1;
 531         unsigned int digital:1;
 532         unsigned int dnd:1;
 533         unsigned int echobreak:1;
 534         unsigned int echocanbridged:1;
 535         unsigned int echocanon:1;
 536         unsigned int faxhandled:1;                      /*!< Has a fax tone already been handled? */
 537         unsigned int firstradio:1;
 538         unsigned int hanguponpolarityswitch:1;
 539         unsigned int hardwaredtmf:1;
 540         unsigned int hidecallerid:1;
 541         unsigned int hidecalleridname:1;      /*!< Hide just the name not the number for legacy PBX use */
 542         unsigned int ignoredtmf:1;
 543         unsigned int immediate:1;                       /*!< Answer before getting digits? */
 544         unsigned int inalarm:1;
 545         unsigned int mate:1;                            /*!< flag to say its in MATE mode */
 546         unsigned int outgoing:1;
 547         /* unsigned int overlapdial:1;                  unused and potentially confusing */
 548         unsigned int permcallwaiting:1;
 549         unsigned int permhidecallerid:1;                /*!< Whether to hide our outgoing caller ID or not */
 550         unsigned int priindication_oob:1;
 551         unsigned int priexclusive:1;
 552         unsigned int pulse:1;
 553         unsigned int pulsedial:1;                       /*!< whether a pulse dial phone is detected */
 554         unsigned int restrictcid:1;                     /*!< Whether restrict the callerid -> only send ANI */
 555         unsigned int threewaycalling:1;
 556         unsigned int transfer:1;
 557         unsigned int use_callerid:1;                    /*!< Whether or not to use caller id on this channel */
 558         unsigned int use_callingpres:1;                 /*!< Whether to use the callingpres the calling switch sends */
 559         unsigned int usedistinctiveringdetection:1;
 560         unsigned int zaptrcallerid:1;                   /*!< should we use the callerid from incoming call on zap transfer or not */
 561         unsigned int transfertobusy:1;                  /*!< allow flash-transfers to busy channels */
 562         /* Channel state or unavilability flags */
 563         unsigned int inservice:1;
 564         unsigned int locallyblocked:1;
 565         unsigned int remotelyblocked:1;
 566 #if defined(HAVE_PRI) || defined(HAVE_SS7)
 567         unsigned int alerting:1;
 568         unsigned int alreadyhungup:1;
 569         unsigned int isidlecall:1;
 570         unsigned int proceeding:1;
 571         unsigned int progress:1;
 572         unsigned int resetting:1;
 573         unsigned int setup_ack:1;
 574 #endif
 575         unsigned int use_smdi:1;                /* Whether to use SMDI on this channel */
 576         struct ast_smdi_interface *smdi_iface;  /* The serial port to listen for SMDI data on */
 577
 578         struct zt_distRings drings;
 579
 580         char context[AST_MAX_CONTEXT];
 581         char defcontext[AST_MAX_CONTEXT];
 582         char exten[AST_MAX_EXTENSION];
 583         char language[MAX_LANGUAGE];
 584         char mohinterpret[MAX_MUSICCLASS];
 585         char mohsuggest[MAX_MUSICCLASS];
 586 #if defined(PRI_ANI) || defined(HAVE_SS7)
 587         char cid_ani[AST_MAX_EXTENSION];
 588 #endif
 589         int cid_ani2;
 590         char cid_num[AST_MAX_EXTENSION];
 591         int cid_ton;                                    /*!< Type Of Number (TON) */
 592         char cid_name[AST_MAX_EXTENSION];
 593         char lastcid_num[AST_MAX_EXTENSION];
 594         char lastcid_name[AST_MAX_EXTENSION];
 595         char *origcid_num;                              /*!< malloced original callerid */
 596         char *origcid_name;                             /*!< malloced original callerid */
 597         char callwait_num[AST_MAX_EXTENSION];
 598         char callwait_name[AST_MAX_EXTENSION];
 599         char rdnis[AST_MAX_EXTENSION];
 600         char dnid[AST_MAX_EXTENSION];
 601         ast_group_t group;
 602         int law;
 603         int confno;                                     /*!< Our conference */
 604         int confusers;                                  /*!< Who is using our conference */
 605         int propconfno;                                 /*!< Propagated conference number */
 606         ast_group_t callgroup;
 607         ast_group_t pickupgroup;
 608         struct ast_variable *vars;
 609         int channel;                                    /*!< Channel Number or CRV */
 610         int span;                                       /*!< Span number */
 611         time_t guardtime;                               /*!< Must wait this much time before using for new call */
 612         int cid_signalling;                             /*!< CID signalling type bell202 or v23 */
 613         int cid_start;                                  /*!< CID start indicator, polarity or ring */
 614         int callingpres;                                /*!< The value of callling presentation that we're going to use when placing a PRI call */
 615         int callwaitingrepeat;                          /*!< How many samples to wait before repeating call waiting */
 616         int cidcwexpire;                                /*!< When to expire our muting for CID/CW */
 617         unsigned char *cidspill;
 618         int cidpos;
 619         int cidlen;
 620         int ringt;
 621         int ringt_base;
 622         int stripmsd;
 623         int callwaitcas;
 624         int callwaitrings;
 625         int echocancel;
 626         int echotraining;
 627         char echorest[20];
 628         int busycount;
 629         int busy_tonelength;
 630         int busy_quietlength;
 631         int callprogress;
 632         struct timeval flashtime;                       /*!< Last flash-hook time */
 633         struct ast_dsp *dsp;
 634         int cref;                                       /*!< Call reference number */
 635         ZT_DIAL_OPERATION dop;
 636         int whichwink;                                  /*!< SIG_FEATDMF_TA Which wink are we on? */
 637         char finaldial[64];
 638         char accountcode[AST_MAX_ACCOUNT_CODE];         /*!< Account code */
 639         int amaflags;                                   /*!< AMA Flags */
 640         struct tdd_state *tdd;                          /*!< TDD flag */
 641         char call_forward[AST_MAX_EXTENSION];
 642         char mailbox[AST_MAX_EXTENSION];
 643         struct ast_event_sub *mwi_event_sub;
 644         char dialdest[256];
 645         int onhooktime;
 646         int msgstate;
 647         int distinctivering;                            /*!< Which distinctivering to use */
 648         int cidrings;                                   /*!< Which ring to deliver CID on */
 649         int dtmfrelax;                                  /*!< whether to run in relaxed DTMF mode */
 650         int fake_event;
 651         int polarityonanswerdelay;
 652         struct timeval polaritydelaytv;
 653         int sendcalleridafter;
 654 #ifdef HAVE_PRI
 655         struct zt_pri *pri;
 656         struct zt_pvt *bearer;
 657         struct zt_pvt *realcall;
 658         q931_call *call;
 659         int prioffset;
 660         int logicalspan;
 661 #endif
 662         int polarity;
 663         int dsp_features;
 664 #ifdef HAVE_SS7
 665         struct zt_ss7 *ss7;
 666         struct isup_call *ss7call;
 667         char charge_number[50];
 668         int transcap;
 669         int cic;                                                        /*!< CIC associated with channel */
 670         unsigned int dpc;                                               /*!< CIC's DPC */
 671         unsigned int loopedback:1;
 672 #endif
 673         char begindigit;
 674 } *iflist = NULL, *ifend = NULL;
 675
 676 /*! \brief Channel configuration from zapata.conf .
 677  * This struct is used for parsing the [channels] section of zapata.conf.
 678  * Generally there is a field here for every possible configuration item.
 679  *
 680  * The state of fields is saved along the parsing and whenever a 'channel'
 681  * statement is reached, the current zt_chan_conf is used to configure the
 682  * channel (struct zt_pvt)
 683  *
 684  * \see zt_chan_init for the default values.
 685  */
 686 struct zt_chan_conf {
 687         struct zt_pvt chan;
 688 #ifdef HAVE_PRI
 689         struct zt_pri pri;
 690 #endif
 691
 692 #ifdef HAVE_SS7
 693         struct zt_ss7 ss7;
 694 #endif
 695         ZT_PARAMS timing;
 696
 697         char smdi_port[SMDI_MAX_FILENAME_LEN];
 698 };
 699
 700 /** returns a new zt_chan_conf with default values (by-value) */
 701 static struct zt_chan_conf zt_chan_conf_default(void) {
 702         /* recall that if a field is not included here it is initialized
 703          * to 0 or equivalent
 704          */
 705         struct zt_chan_conf conf = {
 706 #ifdef HAVE_PRI
 707                 .pri = {
 708                         .nsf = PRI_NSF_NONE,
 709                         .switchtype = PRI_SWITCH_NI2,
 710                         .dialplan = PRI_NATIONAL_ISDN + 1,
 711                         .localdialplan = PRI_NATIONAL_ISDN + 1,
 712                         .nodetype = PRI_CPE,
 713
 714                         .minunused = 2,
 715                         .idleext = "",
 716                         .idledial = "",
 717                         .internationalprefix = "",
 718                         .nationalprefix = "",
 719                         .localprefix = "",
 720                         .privateprefix = "",
 721                         .unknownprefix = "",
 722                         .resetinterval = -1,
 723                 },
 724 #endif
 725 #ifdef HAVE_SS7
 726                 .ss7 = {
 727                         .called_nai = SS7_NAI_NATIONAL,
 728                         .calling_nai = SS7_NAI_NATIONAL,
 729                         .internationalprefix = "",
 730                         .nationalprefix = "",
 731                         .subscriberprefix = "",
 732                         .unknownprefix = ""
 733                 },
 734 #endif
 735                 .chan = {
 736                         .context = "default",
 737                         .cid_num = "",
 738                         .cid_name = "",
 739                         .mohinterpret = "default",
 740                         .mohsuggest = "",
 741                         .transfertobusy = 1,
 742
 743                         .cid_signalling = CID_SIG_BELL,
 744                         .cid_start = CID_START_RING,
 745                         .zaptrcallerid = 0,
 746                         .use_callerid = 1,
 747                         .sig = -1,
 748                         .outsigmod = -1,
 749
 750                         .cid_rxgain = +5.0,
 751
 752                         .tonezone = -1,
 753
 754                         .echocancel = 1,
 755
 756                         .busycount = 3,
 757
 758                         .accountcode = "",
 759
 760                         .mailbox = "",
 761
 762
 763                         .polarityonanswerdelay = 600,
 764
 765                         .sendcalleridafter = DEFAULT_CIDRINGS
 766                 },
 767                 .timing = {
 768                         .prewinktime = -1,
 769                         .preflashtime = -1,
 770                         .winktime = -1,
 771                         .flashtime = -1,
 772                         .starttime = -1,
 773                         .rxwinktime = -1,
 774                         .rxflashtime = -1,
 775                         .debouncetime = -1
 776                 },
 777                 .smdi_port = "/dev/ttyS0",
 778         };
 779
 780         return conf;
 781 }
 782
 783
 784 static struct ast_channel *zt_request(const char *type, int format, void *data, int *cause);
 785 static int zt_digit_begin(struct ast_channel *ast, char digit);
 786 static int zt_digit_end(struct ast_channel *ast, char digit, unsigned int duration);
 787 static int zt_sendtext(struct ast_channel *c, const char *text);
 788 static int zt_call(struct ast_channel *ast, char *rdest, int timeout);
 789 static int zt_hangup(struct ast_channel *ast);
 790 static int zt_answer(struct ast_channel *ast);
 791 static struct ast_frame *zt_read(struct ast_channel *ast);
 792 static int zt_write(struct ast_channel *ast, struct ast_frame *frame);
 793 static struct ast_frame *zt_exception(struct ast_channel *ast);
 794 static int zt_indicate(struct ast_channel *chan, int condition, const void *data, size_t datalen);
 795 static int zt_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);
 796 static int zt_setoption(struct ast_channel *chan, int option, void *data, int datalen);
 797 static int zt_func_read(struct ast_channel *chan, const char *function, char *data, char *buf, size_t len);
 798
 799 static const struct ast_channel_tech zap_tech = {
 800         .type = "Zap",
 801         .description = tdesc,
 802         .capabilities = AST_FORMAT_SLINEAR | AST_FORMAT_ULAW | AST_FORMAT_ALAW,
 803         .requester = zt_request,
 804         .send_digit_begin = zt_digit_begin,
 805         .send_digit_end = zt_digit_end,
 806         .send_text = zt_sendtext,
 807         .call = zt_call,
 808         .hangup = zt_hangup,
 809         .answer = zt_answer,
 810         .read = zt_read,
 811         .write = zt_write,
 812         .bridge = zt_bridge,
 813         .exception = zt_exception,
 814         .indicate = zt_indicate,
 815         .fixup = zt_fixup,
 816         .setoption = zt_setoption,
 817         .func_channel_read = zt_func_read,
 818 };
 819
 820 #ifdef HAVE_PRI
 821 #define GET_CHANNEL(p) ((p)->bearer ? (p)->bearer->channel : p->channel)
 822 #else
 823 #define GET_CHANNEL(p) ((p)->channel)
 824 #endif
 825
 826 struct zt_pvt *round_robin[32];
 827
 828 #ifdef HAVE_PRI
 829 static inline int pri_grab(struct zt_pvt *pvt, struct zt_pri *pri)
 830 {
 831         int res;
 832         /* Grab the lock first */
 833         do {
 834                 res = ast_mutex_trylock(&pri->lock);
 835                 if (res) {
 836                         ast_mutex_unlock(&pvt->lock);
 837                         /* Release the lock and try again */
 838                         usleep(1);
 839                         ast_mutex_lock(&pvt->lock);
 840                 }
 841         } while (res);
 842         /* Then break the poll */
 843         pthread_kill(pri->master, SIGURG);
 844         return 0;
 845 }
 846 #endif
 847
 848 #ifdef HAVE_SS7
 849 static inline void ss7_rel(struct zt_ss7 *ss7)
 850 {
 851         ast_mutex_unlock(&ss7->lock);
 852 }
 853
 854 static inline int ss7_grab(struct zt_pvt *pvt, struct zt_ss7 *pri)
 855 {
 856         int res;
 857         /* Grab the lock first */
 858         do {
 859                 res = ast_mutex_trylock(&pri->lock);
 860                 if (res) {
 861                         ast_mutex_unlock(&pvt->lock);
 862                         /* Release the lock and try again */
 863                         usleep(1);
 864                         ast_mutex_lock(&pvt->lock);
 865                 }
 866         } while (res);
 867         /* Then break the poll */
 868         pthread_kill(pri->master, SIGURG);
 869         return 0;
 870 }
 871 #endif
 872 #define NUM_CADENCE_MAX 25
 873 static int num_cadence = 4;
 874 static int user_has_defined_cadences = 0;
 875
 876 static struct zt_ring_cadence cadences[NUM_CADENCE_MAX] = {
 877         { { 125, 125, 2000, 4000 } },                   /*!< Quick chirp followed by normal ring */
 878         { { 250, 250, 500, 1000, 250, 250, 500, 4000 } }, /*!< British style ring */
 879         { { 125, 125, 125, 125, 125, 4000 } },  /*!< Three short bursts */
 880         { { 1000, 500, 2500, 5000 } },  /*!< Long ring */
 881 };
 882
 883 /*! \brief cidrings says in which pause to transmit the cid information, where the first pause
 884  * is 1, the second pause is 2 and so on.
 885  */
 886
 887 static int cidrings[NUM_CADENCE_MAX] = {
 888         2,                                                                              /*!< Right after first long ring */
 889         4,                                                                              /*!< Right after long part */
 890         3,                                                                              /*!< After third chirp */
 891         2,                                                                              /*!< Second spell */
 892 };
 893
 894 #define ISTRUNK(p) ((p->sig == SIG_FXSLS) || (p->sig == SIG_FXSKS) || \
 895                         (p->sig == SIG_FXSGS) || (p->sig == SIG_PRI))
 896
 897 #define CANBUSYDETECT(p) (ISTRUNK(p) || (p->sig & (SIG_EM | SIG_EM_E1 | SIG_SF)) /* || (p->sig & __ZT_SIG_FXO) */)
 898 #define CANPROGRESSDETECT(p) (ISTRUNK(p) || (p->sig & (SIG_EM | SIG_EM_E1 | SIG_SF)) /* || (p->sig & __ZT_SIG_FXO) */)
 899
 900 static int zt_get_index(struct ast_channel *ast, struct zt_pvt *p, int nullok)
 901 {
 902         int res;
 903         if (p->subs[0].owner == ast)
 904                 res = 0;
 905         else if (p->subs[1].owner == ast)
 906                 res = 1;
 907         else if (p->subs[2].owner == ast)
 908                 res = 2;
 909         else {
 910                 res = -1;
 911                 if (!nullok)
 912                         ast_log(LOG_WARNING, "Unable to get index, and nullok is not asserted\n");
 913         }
 914         return res;
 915 }
 916
 917 #ifdef HAVE_PRI
 918 static void wakeup_sub(struct zt_pvt *p, int a, struct zt_pri *pri)
 919 #else
 920 static void wakeup_sub(struct zt_pvt *p, int a, void *pri)
 921 #endif
 922 {
 923 #ifdef HAVE_PRI
 924         if (pri)
 925                 ast_mutex_unlock(&pri->lock);
 926 #endif
 927         for (;;) {
 928                 if (p->subs[a].owner) {
 929                         if (ast_channel_trylock(p->subs[a].owner)) {
 930                                 ast_mutex_unlock(&p->lock);
 931                                 usleep(1);
 932                                 ast_mutex_lock(&p->lock);
 933                         } else {
 934                                 ast_queue_frame(p->subs[a].owner, &ast_null_frame);
 935                                 ast_channel_unlock(p->subs[a].owner);
 936                                 break;
 937                         }
 938                 } else
 939                         break;
 940         }
 941 #ifdef HAVE_PRI
 942         if (pri)
 943                 ast_mutex_lock(&pri->lock);
 944 #endif
 945 }
 946
 947 static void zap_queue_frame(struct zt_pvt *p, struct ast_frame *f, void *data)
 948 {
 949 #ifdef HAVE_PRI
 950         struct zt_pri *pri = (struct zt_pri*) data;
 951 #endif
 952 #ifdef HAVE_SS7
 953         struct zt_ss7 *ss7 = (struct zt_ss7*) data;
 954 #endif
 955         /* We must unlock the PRI to avoid the possibility of a deadlock */
 956 #if defined(HAVE_PRI) || defined(HAVE_SS7)
 957         if (data) {
 958                 switch (p->sig) {
 959 #ifdef HAVE_PRI
 960                 case SIG_PRI:
 961                         ast_mutex_unlock(&pri->lock);
 962                         break;
 963 #endif
 964 #ifdef HAVE_SS7
 965                 case SIG_SS7:
 966                         ast_mutex_unlock(&ss7->lock);
 967                         break;
 968 #endif
 969                 default:
 970                         break;
 971                 }
 972         }
 973 #endif
 974         for (;;) {
 975                 if (p->owner) {
 976                         if (ast_channel_trylock(p->owner)) {
 977                                 ast_mutex_unlock(&p->lock);
 978                                 usleep(1);
 979                                 ast_mutex_lock(&p->lock);
 980                         } else {
 981                                 ast_queue_frame(p->owner, f);
 982                                 ast_channel_unlock(p->owner);
 983                                 break;
 984                         }
 985                 } else
 986                         break;
 987         }
 988 #if defined(HAVE_PRI) || defined(HAVE_SS7)
 989         if (data) {
 990                 switch (p->sig) {
 991 #ifdef HAVE_PRI
 992                 case SIG_PRI:
 993                         ast_mutex_lock(&pri->lock);
 994                         break;
 995 #endif
 996 #ifdef HAVE_SS7
 997                 case SIG_SS7:
 998                         ast_mutex_lock(&ss7->lock);
 999                         break;
1000 #endif
1001                 default:
1002                         break;
1003                 }
1004         }
1005
1006 #endif
1007 }
1008
1009 static int restore_gains(struct zt_pvt *p);
1010
1011 static void swap_subs(struct zt_pvt *p, int a, int b)
1012 {
1013         int tchan;
1014         int tinthreeway;
1015         struct ast_channel *towner;
1016
1017         ast_debug(1, "Swapping %d and %d\n", a, b);
1018
1019         tchan = p->subs[a].chan;
1020         towner = p->subs[a].owner;
1021         tinthreeway = p->subs[a].inthreeway;
1022
1023         p->subs[a].chan = p->subs[b].chan;
1024         p->subs[a].owner = p->subs[b].owner;
1025         p->subs[a].inthreeway = p->subs[b].inthreeway;
1026
1027         p->subs[b].chan = tchan;
1028         p->subs[b].owner = towner;
1029         p->subs[b].inthreeway = tinthreeway;
1030
1031         if (p->subs[a].owner)
1032                 ast_channel_set_fd(p->subs[a].owner, 0, p->subs[a].zfd);
1033         if (p->subs[b].owner)
1034                 ast_channel_set_fd(p->subs[b].owner, 0, p->subs[b].zfd);
1035         wakeup_sub(p, a, NULL);
1036         wakeup_sub(p, b, NULL);
1037 }
1038
1039 static int zt_open(char *fn)
1040 {
1041         int fd;
1042         int isnum;
1043         int chan = 0;
1044         int bs;
1045         int x;
1046         isnum = 1;
1047         for (x = 0; x < strlen(fn); x++) {
1048                 if (!isdigit(fn[x])) {
1049                         isnum = 0;
1050                         break;
1051                 }
1052         }
1053         if (isnum) {
1054                 chan = atoi(fn);
1055                 if (chan < 1) {
1056                         ast_log(LOG_WARNING, "Invalid channel number '%s'\n", fn);
1057                         return -1;
1058                 }
1059                 fn = "/dev/zap/channel";
1060         }
1061         fd = open(fn, O_RDWR | O_NONBLOCK);
1062         if (fd < 0) {
1063                 ast_log(LOG_WARNING, "Unable to open '%s': %s\n", fn, strerror(errno));
1064                 return -1;
1065         }
1066         if (chan) {
1067                 if (ioctl(fd, ZT_SPECIFY, &chan)) {
1068                         x = errno;
1069                         close(fd);
1070                         errno = x;
1071                         ast_log(LOG_WARNING, "Unable to specify channel %d: %s\n", chan, strerror(errno));
1072                         return -1;
1073                 }
1074         }
1075         bs = READ_SIZE;
1076         if (ioctl(fd, ZT_SET_BLOCKSIZE, &bs) == -1) return -1;
1077         return fd;
1078 }
1079
1080 static void zt_close(int fd)
1081 {
1082         if (fd > 0)
1083                 close(fd);
1084 }
1085
1086 static int zt_setlinear(int zfd, int linear)
1087 {
1088         int res;
1089         res = ioctl(zfd, ZT_SETLINEAR, &linear);
1090         if (res)
1091                 return res;
1092         return 0;
1093 }
1094
1095
1096 static int alloc_sub(struct zt_pvt *p, int x)
1097 {
1098         ZT_BUFFERINFO bi;
1099         int res;
1100         if (p->subs[x].zfd < 0) {
1101                 p->subs[x].zfd = zt_open("/dev/zap/pseudo");
1102                 if (p->subs[x].zfd > -1) {
1103                         res = ioctl(p->subs[x].zfd, ZT_GET_BUFINFO, &bi);
1104                         if (!res) {
1105                                 bi.txbufpolicy = ZT_POLICY_IMMEDIATE;
1106                                 bi.rxbufpolicy = ZT_POLICY_IMMEDIATE;
1107                                 bi.numbufs = numbufs;
1108                                 res = ioctl(p->subs[x].zfd, ZT_SET_BUFINFO, &bi);
1109                                 if (res < 0) {
1110                                         ast_log(LOG_WARNING, "Unable to set buffer policy on channel %d\n", x);
1111                                 }
1112                         } else
1113                                 ast_log(LOG_WARNING, "Unable to check buffer policy on channel %d\n", x);
1114                         if (ioctl(p->subs[x].zfd, ZT_CHANNO, &p->subs[x].chan) == 1) {
1115                                 ast_log(LOG_WARNING, "Unable to get channel number for pseudo channel on FD %d\n", p->subs[x].zfd);
1116                                 zt_close(p->subs[x].zfd);
1117                                 p->subs[x].zfd = -1;
1118                                 return -1;
1119                         }
1120                         ast_debug(1, "Allocated %s subchannel on FD %d channel %d\n", subnames[x], p->subs[x].zfd, p->subs[x].chan);
1121                         return 0;
1122                 } else
1123                         ast_log(LOG_WARNING, "Unable to open pseudo channel: %s\n", strerror(errno));
1124                 return -1;
1125         }
1126         ast_log(LOG_WARNING, "%s subchannel of %d already in use\n", subnames[x], p->channel);
1127         return -1;
1128 }
1129
1130 static int unalloc_sub(struct zt_pvt *p, int x)
1131 {
1132         if (!x) {
1133                 ast_log(LOG_WARNING, "Trying to unalloc the real channel %d?!?\n", p->channel);
1134                 return -1;
1135         }
1136         ast_debug(1, "Released sub %d of channel %d\n", x, p->channel);
1137         if (p->subs[x].zfd > -1) {
1138                 zt_close(p->subs[x].zfd);
1139         }
1140         p->subs[x].zfd = -1;
1141         p->subs[x].linear = 0;
1142         p->subs[x].chan = 0;
1143         p->subs[x].owner = NULL;
1144         p->subs[x].inthreeway = 0;
1145         p->polarity = POLARITY_IDLE;
1146         memset(&p->subs[x].curconf, 0, sizeof(p->subs[x].curconf));
1147         return 0;
1148 }
1149
1150 static int digit_to_dtmfindex(char digit)
1151 {
1152         if (isdigit(digit))
1153                 return ZT_TONE_DTMF_BASE + (digit - '0');
1154         else if (digit >= 'A' && digit <= 'D')
1155                 return ZT_TONE_DTMF_A + (digit - 'A');
1156         else if (digit >= 'a' && digit <= 'd')
1157                 return ZT_TONE_DTMF_A + (digit - 'a');
1158         else if (digit == '*')
1159                 return ZT_TONE_DTMF_s;
1160         else if (digit == '#')
1161                 return ZT_TONE_DTMF_p;
1162         else
1163                 return -1;
1164 }
1165
1166 static int zt_digit_begin(struct ast_channel *chan, char digit)
1167 {
1168         struct zt_pvt *pvt;
1169         int index;
1170         int dtmf = -1;
1171
1172         pvt = chan->tech_pvt;
1173
1174         ast_mutex_lock(&pvt->lock);
1175
1176         index = zt_get_index(chan, pvt, 0);
1177
1178         if ((index != SUB_REAL) || !pvt->owner)
1179                 goto out;
1180
1181 #ifdef HAVE_PRI
1182         if ((pvt->sig == SIG_PRI) && (chan->_state == AST_STATE_DIALING) && !pvt->proceeding) {
1183                 if (pvt->setup_ack) {
1184                         if (!pri_grab(pvt, pvt->pri)) {
1185                                 pri_information(pvt->pri->pri, pvt->call, digit);
1186                                 pri_rel(pvt->pri);
1187                         } else
1188                                 ast_log(LOG_WARNING, "Unable to grab PRI on span %d\n", pvt->span);
1189                 } else if (strlen(pvt->dialdest) < sizeof(pvt->dialdest) - 1) {
1190                         int res;
1191                         ast_debug(1, "Queueing digit '%c' since setup_ack not yet received\n", digit);
1192                         res = strlen(pvt->dialdest);
1193                         pvt->dialdest[res++] = digit;
1194                         pvt->dialdest[res] = '\0';
1195                 }
1196                 goto out;
1197         }
1198 #endif
1199         if ((dtmf = digit_to_dtmfindex(digit)) == -1)
1200                 goto out;
1201
1202         if (pvt->pulse || ioctl(pvt->subs[SUB_REAL].zfd, ZT_SENDTONE, &dtmf)) {
1203                 int res;
1204                 ZT_DIAL_OPERATION zo = {
1205                         .op = ZT_DIAL_OP_APPEND,
1206                 };
1207
1208                 zo.dialstr[0] = 'T';
1209                 zo.dialstr[1] = digit;
1210                 zo.dialstr[2] = '\0';
1211                 if ((res = ioctl(pvt->subs[SUB_REAL].zfd, ZT_DIAL, &zo)))
1212                         ast_log(LOG_WARNING, "Couldn't dial digit %c\n", digit);
1213                 else
1214                         pvt->dialing = 1;
1215         } else {
1216                 ast_debug(1, "Started VLDTMF digit '%c'\n", digit);
1217                 pvt->dialing = 1;
1218                 pvt->begindigit = digit;
1219         }
1220
1221 out:
1222         ast_mutex_unlock(&pvt->lock);
1223
1224         return 0;
1225 }
1226
1227 static int zt_digit_end(struct ast_channel *chan, char digit, unsigned int duration)
1228 {
1229         struct zt_pvt *pvt;
1230         int res = 0;
1231         int index;
1232         int x;
1233
1234         pvt = chan->tech_pvt;
1235
1236         ast_mutex_lock(&pvt->lock);
1237
1238         index = zt_get_index(chan, pvt, 0);
1239
1240         if ((index != SUB_REAL) || !pvt->owner || pvt->pulse)
1241                 goto out;
1242
1243 #ifdef HAVE_PRI
1244         /* This means that the digit was already sent via PRI signalling */
1245         if (pvt->sig == SIG_PRI && !pvt->begindigit)
1246                 goto out;
1247 #endif
1248
1249         if (pvt->begindigit) {
1250                 x = -1;
1251                 ast_debug(1, "Ending VLDTMF digit '%c'\n", digit);
1252                 res = ioctl(pvt->subs[SUB_REAL].zfd, ZT_SENDTONE, &x);
1253                 pvt->dialing = 0;
1254                 pvt->begindigit = 0;
1255         }
1256
1257 out:
1258         ast_mutex_unlock(&pvt->lock);
1259
1260         return res;
1261 }
1262
1263 static char *events[] = {
1264         "No event",
1265         "On hook",
1266         "Ring/Answered",
1267         "Wink/Flash",
1268         "Alarm",
1269         "No more alarm",
1270         "HDLC Abort",
1271         "HDLC Overrun",
1272         "HDLC Bad FCS",
1273         "Dial Complete",
1274         "Ringer On",
1275         "Ringer Off",
1276         "Hook Transition Complete",
1277         "Bits Changed",
1278         "Pulse Start",
1279         "Timer Expired",
1280         "Timer Ping",
1281         "Polarity Reversal",
1282         "Ring Begin",
1283 };
1284
1285 static struct {
1286         int alarm;
1287         char *name;
1288 } alarms[] = {
1289         { ZT_ALARM_RED, "Red Alarm" },
1290         { ZT_ALARM_YELLOW, "Yellow Alarm" },
1291         { ZT_ALARM_BLUE, "Blue Alarm" },
1292         { ZT_ALARM_RECOVER, "Recovering" },
1293         { ZT_ALARM_LOOPBACK, "Loopback" },
1294         { ZT_ALARM_NOTOPEN, "Not Open" },
1295         { ZT_ALARM_NONE, "None" },
1296 };
1297
1298 static char *alarm2str(int alarm)
1299 {
1300         int x;
1301         for (x = 0; x < sizeof(alarms) / sizeof(alarms[0]); x++) {
1302                 if (alarms[x].alarm & alarm)
1303                         return alarms[x].name;
1304         }
1305         return alarm ? "Unknown Alarm" : "No Alarm";
1306 }
1307
1308 static char *event2str(int event)
1309 {
1310         static char buf[256];
1311         if ((event < (sizeof(events) / sizeof(events[0]))) && (event > -1))
1312                 return events[event];
1313         sprintf(buf, "Event %d", event); /* safe */
1314         return buf;
1315 }
1316
1317 #ifdef HAVE_PRI
1318 static char *dialplan2str(int dialplan)
1319 {
1320         if (dialplan == -1 || dialplan == -2) {
1321                 return("Dynamically set dialplan in ISDN");
1322         }
1323         return (pri_plan2str(dialplan));
1324 }
1325 #endif
1326
1327 static char *zap_sig2str(int sig)
1328 {
1329         static char buf[256];
1330         switch (sig) {
1331         case SIG_EM:
1332                 return "E & M Immediate";
1333         case SIG_EMWINK:
1334                 return "E & M Wink";
1335         case SIG_EM_E1:
1336                 return "E & M E1";
1337         case SIG_FEATD:
1338                 return "Feature Group D (DTMF)";
1339         case SIG_FEATDMF:
1340                 return "Feature Group D (MF)";
1341         case SIG_FEATDMF_TA:
1342                 return "Feature Groud D (MF) Tandem Access";
1343         case SIG_FEATB:
1344                 return "Feature Group B (MF)";
1345         case SIG_E911:
1346                 return "E911 (MF)";
1347         case SIG_FGC_CAMA:
1348                 return "FGC/CAMA (Dialpulse)";
1349         case SIG_FGC_CAMAMF:
1350                 return "FGC/CAMA (MF)";
1351         case SIG_FXSLS:
1352                 return "FXS Loopstart";
1353         case SIG_FXSGS:
1354                 return "FXS Groundstart";
1355         case SIG_FXSKS:
1356                 return "FXS Kewlstart";
1357         case SIG_FXOLS:
1358                 return "FXO Loopstart";
1359         case SIG_FXOGS:
1360                 return "FXO Groundstart";
1361         case SIG_FXOKS:
1362                 return "FXO Kewlstart";
1363         case SIG_PRI:
1364                 return "ISDN PRI";
1365         case SIG_SS7:
1366                 return "SS7";
1367         case SIG_SF:
1368                 return "SF (Tone) Immediate";
1369         case SIG_SFWINK:
1370                 return "SF (Tone) Wink";
1371         case SIG_SF_FEATD:
1372                 return "SF (Tone) with Feature Group D (DTMF)";
1373         case SIG_SF_FEATDMF:
1374                 return "SF (Tone) with Feature Group D (MF)";
1375         case SIG_SF_FEATB:
1376                 return "SF (Tone) with Feature Group B (MF)";
1377         case SIG_GR303FXOKS:
1378                 return "GR-303 with FXOKS";
1379         case SIG_GR303FXSKS:
1380                 return "GR-303 with FXSKS";
1381         case 0:
1382                 return "Pseudo";
1383         default:
1384                 snprintf(buf, sizeof(buf), "Unknown signalling %d", sig);
1385                 return buf;
1386         }
1387 }
1388
1389 #define sig2str zap_sig2str
1390
1391 static int conf_add(struct zt_pvt *p, struct zt_subchannel *c, int index, int slavechannel)
1392 {
1393         /* If the conference already exists, and we're already in it
1394            don't bother doing anything */
1395         ZT_CONFINFO zi;
1396
1397         memset(&zi, 0, sizeof(zi));
1398         zi.chan = 0;
1399
1400         if (slavechannel > 0) {
1401                 /* If we have only one slave, do a digital mon */
1402                 zi.confmode = ZT_CONF_DIGITALMON;
1403                 zi.confno = slavechannel;
1404         } else {
1405                 if (!index) {
1406                         /* Real-side and pseudo-side both participate in conference */
1407                         zi.confmode = ZT_CONF_REALANDPSEUDO | ZT_CONF_TALKER | ZT_CONF_LISTENER |
1408                                 ZT_CONF_PSEUDO_TALKER | ZT_CONF_PSEUDO_LISTENER;
1409                 } else
1410                         zi.confmode = ZT_CONF_CONF | ZT_CONF_TALKER | ZT_CONF_LISTENER;
1411                 zi.confno = p->confno;
1412         }
1413         if ((zi.confno == c->curconf.confno) && (zi.confmode == c->curconf.confmode))
1414                 return 0;
1415         if (c->zfd < 0)
1416                 return 0;
1417         if (ioctl(c->zfd, ZT_SETCONF, &zi)) {
1418                 ast_log(LOG_WARNING, "Failed to add %d to conference %d/%d\n", c->zfd, zi.confmode, zi.confno);
1419                 return -1;
1420         }
1421         if (slavechannel < 1) {
1422                 p->confno = zi.confno;
1423         }
1424         memcpy(&c->curconf, &zi, sizeof(c->curconf));
1425         ast_debug(1, "Added %d to conference %d/%d\n", c->zfd, c->curconf.confmode, c->curconf.confno);
1426         return 0;
1427 }
1428
1429 static int isourconf(struct zt_pvt *p, struct zt_subchannel *c)
1430 {
1431         /* If they're listening to our channel, they're ours */
1432         if ((p->channel == c->curconf.confno) && (c->curconf.confmode == ZT_CONF_DIGITALMON))
1433                 return 1;
1434         /* If they're a talker on our (allocated) conference, they're ours */
1435         if ((p->confno > 0) && (p->confno == c->curconf.confno) && (c->curconf.confmode & ZT_CONF_TALKER))
1436                 return 1;
1437         return 0;
1438 }
1439
1440 static int conf_del(struct zt_pvt *p, struct zt_subchannel *c, int index)
1441 {
1442         ZT_CONFINFO zi;
1443         if (/* Can't delete if there's no zfd */
1444                 (c->zfd < 0) ||
1445                 /* Don't delete from the conference if it's not our conference */
1446                 !isourconf(p, c)
1447                 /* Don't delete if we don't think it's conferenced at all (implied) */
1448                 ) return 0;
1449         memset(&zi, 0, sizeof(zi));
1450         zi.chan = 0;
1451         zi.confno = 0;
1452         zi.confmode = 0;
1453         if (ioctl(c->zfd, ZT_SETCONF, &zi)) {
1454                 ast_log(LOG_WARNING, "Failed to drop %d from conference %d/%d\n", c->zfd, c->curconf.confmode, c->curconf.confno);
1455                 return -1;
1456         }
1457         ast_debug(1, "Removed %d from conference %d/%d\n", c->zfd, c->curconf.confmode, c->curconf.confno);
1458         memcpy(&c->curconf, &zi, sizeof(c->curconf));
1459         return 0;
1460 }
1461
1462 static int isslavenative(struct zt_pvt *p, struct zt_pvt **out)
1463 {
1464         int x;
1465         int useslavenative;
1466         struct zt_pvt *slave = NULL;
1467         /* Start out optimistic */
1468         useslavenative = 1;
1469         /* Update conference state in a stateless fashion */
1470         for (x = 0; x < 3; x++) {
1471                 /* Any three-way calling makes slave native mode *definitely* out
1472                    of the question */
1473                 if ((p->subs[x].zfd > -1) && p->subs[x].inthreeway)
1474                         useslavenative = 0;
1475         }
1476         /* If we don't have any 3-way calls, check to see if we have
1477            precisely one slave */
1478         if (useslavenative) {
1479                 for (x = 0; x < MAX_SLAVES; x++) {
1480                         if (p->slaves[x]) {
1481                                 if (slave) {
1482                                         /* Whoops already have a slave!  No
1483                                            slave native and stop right away */
1484                                         slave = NULL;
1485                                         useslavenative = 0;
1486                                         break;
1487                                 } else {
1488                                         /* We have one slave so far */
1489                                         slave = p->slaves[x];
1490                                 }
1491                         }
1492                 }
1493         }
1494         /* If no slave, slave native definitely out */
1495         if (!slave)
1496                 useslavenative = 0;
1497         else if (slave->law != p->law) {
1498                 useslavenative = 0;
1499                 slave = NULL;
1500         }
1501         if (out)
1502                 *out = slave;
1503         return useslavenative;
1504 }
1505
1506 static int reset_conf(struct zt_pvt *p)
1507 {
1508         ZT_CONFINFO zi;
1509         memset(&zi, 0, sizeof(zi));
1510         p->confno = -1;
1511         memset(&p->subs[SUB_REAL].curconf, 0, sizeof(p->subs[SUB_REAL].curconf));
1512         if (p->subs[SUB_REAL].zfd > -1) {
1513                 if (ioctl(p->subs[SUB_REAL].zfd, ZT_SETCONF, &zi))
1514                         ast_log(LOG_WARNING, "Failed to reset conferencing on channel %d!\n", p->channel);
1515         }
1516         return 0;
1517 }
1518
1519 static int update_conf(struct zt_pvt *p)
1520 {
1521         int needconf = 0;
1522         int x;
1523         int useslavenative;
1524         struct zt_pvt *slave = NULL;
1525
1526         useslavenative = isslavenative(p, &slave);
1527         /* Start with the obvious, general stuff */
1528         for (x = 0; x < 3; x++) {
1529                 /* Look for three way calls */
1530                 if ((p->subs[x].zfd > -1) && p->subs[x].inthreeway) {
1531                         conf_add(p, &p->subs[x], x, 0);
1532                         needconf++;
1533                 } else {
1534                         conf_del(p, &p->subs[x], x);
1535                 }
1536         }
1537         /* If we have a slave, add him to our conference now. or DAX
1538            if this is slave native */
1539         for (x = 0; x < MAX_SLAVES; x++) {
1540                 if (p->slaves[x]) {
1541                         if (useslavenative)
1542                                 conf_add(p, &p->slaves[x]->subs[SUB_REAL], SUB_REAL, GET_CHANNEL(p));
1543                         else {
1544                                 conf_add(p, &p->slaves[x]->subs[SUB_REAL], SUB_REAL, 0);
1545                                 needconf++;
1546                         }
1547                 }
1548         }
1549         /* If we're supposed to be in there, do so now */
1550         if (p->inconference && !p->subs[SUB_REAL].inthreeway) {
1551                 if (useslavenative)
1552                         conf_add(p, &p->subs[SUB_REAL], SUB_REAL, GET_CHANNEL(slave));
1553                 else {
1554                         conf_add(p, &p->subs[SUB_REAL], SUB_REAL, 0);
1555                         needconf++;
1556                 }
1557         }
1558         /* If we have a master, add ourselves to his conference */
1559         if (p->master) {
1560                 if (isslavenative(p->master, NULL)) {
1561                         conf_add(p->master, &p->subs[SUB_REAL], SUB_REAL, GET_CHANNEL(p->master));
1562                 } else {
1563                         conf_add(p->master, &p->subs[SUB_REAL], SUB_REAL, 0);
1564                 }
1565         }
1566         if (!needconf) {
1567                 /* Nobody is left (or should be left) in our conference.
1568                    Kill it. */
1569                 p->confno = -1;
1570         }
1571         ast_debug(1, "Updated conferencing on %d, with %d conference users\n", p->channel, needconf);
1572         return 0;
1573 }
1574
1575 static void zt_enable_ec(struct zt_pvt *p)
1576 {
1577         int x;
1578         int res;
1579         if (!p)
1580                 return;
1581         if (p->echocanon) {
1582                 ast_debug(1, "Echo cancellation already on\n");
1583                 return;
1584         }
1585         if (p->digital) {
1586                 ast_debug(1, "Echo cancellation isn't required on digital connection\n");
1587                 return;
1588         }
1589         if (p->echocancel) {
1590                 if ((p->sig == SIG_PRI) || (p->sig == SIG_SS7)) {
1591                         x = 1;
1592                         res = ioctl(p->subs[SUB_REAL].zfd, ZT_AUDIOMODE, &x);
1593                         if (res)
1594                                 ast_log(LOG_WARNING, "Unable to enable echo cancellation on channel %d\n", p->channel);
1595                 }
1596                 x = p->echocancel;
1597                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_ECHOCANCEL, &x);
1598                 if (res)
1599                         ast_log(LOG_WARNING, "Unable to enable echo cancellation on channel %d\n", p->channel);
1600                 else {
1601                         p->echocanon = 1;
1602                         ast_debug(1, "Enabled echo cancellation on channel %d\n", p->channel);
1603                 }
1604         } else
1605                 ast_debug(1, "No echo cancellation requested\n");
1606 }
1607
1608 static void zt_train_ec(struct zt_pvt *p)
1609 {
1610         int x;
1611         int res;
1612         if (p && p->echocancel && p->echotraining) {
1613                 x = p->echotraining;
1614                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_ECHOTRAIN, &x);
1615                 if (res)
1616                         ast_log(LOG_WARNING, "Unable to request echo training on channel %d\n", p->channel);
1617                 else
1618                         ast_debug(1, "Engaged echo training on channel %d\n", p->channel);
1619         } else
1620                 ast_debug(1, "No echo training requested\n");
1621 }
1622
1623 static void zt_disable_ec(struct zt_pvt *p)
1624 {
1625         int x;
1626         int res;
1627         if (p->echocancel) {
1628                 x = 0;
1629                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_ECHOCANCEL, &x);
1630                 if (res)
1631                         ast_log(LOG_WARNING, "Unable to disable echo cancellation on channel %d\n", p->channel);
1632                 else
1633                         ast_debug(1, "disabled echo cancellation on channel %d\n", p->channel);
1634         }
1635         p->echocanon = 0;
1636 }
1637
1638 static void fill_txgain(struct zt_gains *g, float gain, int law)
1639 {
1640         int j;
1641         int k;
1642         float linear_gain = pow(10.0, gain / 20.0);
1643
1644         switch (law) {
1645         case ZT_LAW_ALAW:
1646                 for (j = 0; j < (sizeof(g->txgain) / sizeof(g->txgain[0])); j++) {
1647                         if (gain) {
1648                                 k = (int) (((float) AST_ALAW(j)) * linear_gain);
1649                                 if (k > 32767) k = 32767;
1650                                 if (k < -32767) k = -32767;
1651                                 g->txgain[j] = AST_LIN2A(k);
1652                         } else {
1653                                 g->txgain[j] = j;
1654                         }
1655                 }
1656                 break;
1657         case ZT_LAW_MULAW:
1658                 for (j = 0; j < (sizeof(g->txgain) / sizeof(g->txgain[0])); j++) {
1659                         if (gain) {
1660                                 k = (int) (((float) AST_MULAW(j)) * linear_gain);
1661                                 if (k > 32767) k = 32767;
1662                                 if (k < -32767) k = -32767;
1663                                 g->txgain[j] = AST_LIN2MU(k);
1664                         } else {
1665                                 g->txgain[j] = j;
1666                         }
1667                 }
1668                 break;
1669         }
1670 }
1671
1672 static void fill_rxgain(struct zt_gains *g, float gain, int law)
1673 {
1674         int j;
1675         int k;
1676         float linear_gain = pow(10.0, gain / 20.0);
1677
1678         switch (law) {
1679         case ZT_LAW_ALAW:
1680                 for (j = 0; j < (sizeof(g->rxgain) / sizeof(g->rxgain[0])); j++) {
1681                         if (gain) {
1682                                 k = (int) (((float) AST_ALAW(j)) * linear_gain);
1683                                 if (k > 32767) k = 32767;
1684                                 if (k < -32767) k = -32767;
1685                                 g->rxgain[j] = AST_LIN2A(k);
1686                         } else {
1687                                 g->rxgain[j] = j;
1688                         }
1689                 }
1690                 break;
1691         case ZT_LAW_MULAW:
1692                 for (j = 0; j < (sizeof(g->rxgain) / sizeof(g->rxgain[0])); j++) {
1693                         if (gain) {
1694                                 k = (int) (((float) AST_MULAW(j)) * linear_gain);
1695                                 if (k > 32767) k = 32767;
1696                                 if (k < -32767) k = -32767;
1697                                 g->rxgain[j] = AST_LIN2MU(k);
1698                         } else {
1699                                 g->rxgain[j] = j;
1700                         }
1701                 }
1702                 break;
1703         }
1704 }
1705
1706 static int set_actual_txgain(int fd, int chan, float gain, int law)
1707 {
1708         struct zt_gains g;
1709         int res;
1710
1711         memset(&g, 0, sizeof(g));
1712         g.chan = chan;
1713         res = ioctl(fd, ZT_GETGAINS, &g);
1714         if (res) {
1715                 ast_debug(1, "Failed to read gains: %s\n", strerror(errno));
1716                 return res;
1717         }
1718
1719         fill_txgain(&g, gain, law);
1720
1721         return ioctl(fd, ZT_SETGAINS, &g);
1722 }
1723
1724 static int set_actual_rxgain(int fd, int chan, float gain, int law)
1725 {
1726         struct zt_gains g;
1727         int res;
1728
1729         memset(&g, 0, sizeof(g));
1730         g.chan = chan;
1731         res = ioctl(fd, ZT_GETGAINS, &g);
1732         if (res) {
1733                 ast_debug(1, "Failed to read gains: %s\n", strerror(errno));
1734                 return res;
1735         }
1736
1737         fill_rxgain(&g, gain, law);
1738
1739         return ioctl(fd, ZT_SETGAINS, &g);
1740 }
1741
1742 static int set_actual_gain(int fd, int chan, float rxgain, float txgain, int law)
1743 {
1744         return set_actual_txgain(fd, chan, txgain, law) | set_actual_rxgain(fd, chan, rxgain, law);
1745 }
1746
1747 static int bump_gains(struct zt_pvt *p)
1748 {
1749         int res;
1750
1751         /* Bump receive gain by value stored in cid_rxgain */
1752         res = set_actual_gain(p->subs[SUB_REAL].zfd, 0, p->rxgain + p->cid_rxgain, p->txgain, p->law);
1753         if (res) {
1754                 ast_log(LOG_WARNING, "Unable to bump gain: %s\n", strerror(errno));
1755                 return -1;
1756         }
1757
1758         return 0;
1759 }
1760
1761 static int restore_gains(struct zt_pvt *p)
1762 {
1763         int res;
1764
1765         res = set_actual_gain(p->subs[SUB_REAL].zfd, 0, p->rxgain, p->txgain, p->law);
1766         if (res) {
1767                 ast_log(LOG_WARNING, "Unable to restore gains: %s\n", strerror(errno));
1768                 return -1;
1769         }
1770
1771         return 0;
1772 }
1773
1774 static inline int zt_set_hook(int fd, int hs)
1775 {
1776         int x, res;
1777
1778         x = hs;
1779         res = ioctl(fd, ZT_HOOK, &x);
1780
1781         if (res < 0) {
1782                 if (errno == EINPROGRESS)
1783                         return 0;
1784                 ast_log(LOG_WARNING, "zt hook failed: %s\n", strerror(errno));
1785         }
1786
1787         return res;
1788 }
1789
1790 static inline int zt_confmute(struct zt_pvt *p, int muted)
1791 {
1792         int x, y, res;
1793         x = muted;
1794         if ((p->sig == SIG_PRI) || (p->sig == SIG_SS7)) {
1795                 y = 1;
1796                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_AUDIOMODE, &y);
1797                 if (res)
1798                         ast_log(LOG_WARNING, "Unable to set audio mode on '%d'\n", p->channel);
1799         }
1800         res = ioctl(p->subs[SUB_REAL].zfd, ZT_CONFMUTE, &x);
1801         if (res < 0)
1802                 ast_log(LOG_WARNING, "zt confmute(%d) failed on channel %d: %s\n", muted, p->channel, strerror(errno));
1803         return res;
1804 }
1805
1806 static int save_conference(struct zt_pvt *p)
1807 {
1808         struct zt_confinfo c;
1809         int res;
1810         if (p->saveconf.confmode) {
1811                 ast_log(LOG_WARNING, "Can't save conference -- already in use\n");
1812                 return -1;
1813         }
1814         p->saveconf.chan = 0;
1815         res = ioctl(p->subs[SUB_REAL].zfd, ZT_GETCONF, &p->saveconf);
1816         if (res) {
1817                 ast_log(LOG_WARNING, "Unable to get conference info: %s\n", strerror(errno));
1818                 p->saveconf.confmode = 0;
1819                 return -1;
1820         }
1821         c.chan = 0;
1822         c.confno = 0;
1823         c.confmode = ZT_CONF_NORMAL;
1824         res = ioctl(p->subs[SUB_REAL].zfd, ZT_SETCONF, &c);
1825         if (res) {
1826                 ast_log(LOG_WARNING, "Unable to set conference info: %s\n", strerror(errno));
1827                 return -1;
1828         }
1829         ast_debug(1, "Disabled conferencing\n");
1830         return 0;
1831 }
1832
1833 static int restore_conference(struct zt_pvt *p)
1834 {
1835         int res;
1836         if (p->saveconf.confmode) {
1837                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_SETCONF, &p->saveconf);
1838                 p->saveconf.confmode = 0;
1839                 if (res) {
1840                         ast_log(LOG_WARNING, "Unable to restore conference info: %s\n", strerror(errno));
1841                         return -1;
1842                 }
1843         }
1844         ast_debug(1, "Restored conferencing\n");
1845         return 0;
1846 }
1847
1848 static int send_callerid(struct zt_pvt *p);
1849
1850 static int send_cwcidspill(struct zt_pvt *p)
1851 {
1852         p->callwaitcas = 0;
1853         p->cidcwexpire = 0;
1854         if (!(p->cidspill = ast_malloc(MAX_CALLERID_SIZE)))
1855                 return -1;
1856         p->cidlen = ast_callerid_callwaiting_generate(p->cidspill, p->callwait_name, p->callwait_num, AST_LAW(p));
1857         /* Make sure we account for the end */
1858         p->cidlen += READ_SIZE * 4;
1859         p->cidpos = 0;
1860         send_callerid(p);
1861         ast_verb(3, "CPE supports Call Waiting Caller*ID.  Sending '%s/%s'\n", p->callwait_name, p->callwait_num);
1862         return 0;
1863 }
1864
1865 static int has_voicemail(struct zt_pvt *p)
1866 {
1867         int new_msgs;
1868         struct ast_event *event;
1869         char *mailbox, *context;
1870
1871         mailbox = context = ast_strdupa(p->mailbox);
1872         strsep(&context, "@");
1873         if (ast_strlen_zero(context))
1874                 context = "default";
1875
1876         event = ast_event_get_cached(AST_EVENT_MWI,
1877                 AST_EVENT_IE_MAILBOX, AST_EVENT_IE_PLTYPE_STR, mailbox,
1878                 AST_EVENT_IE_CONTEXT, AST_EVENT_IE_PLTYPE_STR, context,
1879                 AST_EVENT_IE_NEWMSGS, AST_EVENT_IE_PLTYPE_EXISTS,
1880                 AST_EVENT_IE_END);
1881
1882         if (event) {
1883                 new_msgs = ast_event_get_ie_uint(event, AST_EVENT_IE_NEWMSGS);
1884                 ast_event_destroy(event);
1885         } else
1886                 new_msgs = ast_app_has_voicemail(p->mailbox, NULL);
1887
1888         return new_msgs;
1889 }
1890
1891 static int send_callerid(struct zt_pvt *p)
1892 {
1893         /* Assumes spill in p->cidspill, p->cidlen in length and we're p->cidpos into it */
1894         int res;
1895         /* Take out of linear mode if necessary */
1896         if (p->subs[SUB_REAL].linear) {
1897                 p->subs[SUB_REAL].linear = 0;
1898                 zt_setlinear(p->subs[SUB_REAL].zfd, 0);
1899         }
1900         while (p->cidpos < p->cidlen) {
1901                 res = write(p->subs[SUB_REAL].zfd, p->cidspill + p->cidpos, p->cidlen - p->cidpos);
1902                 if (res < 0) {
1903                         if (errno == EAGAIN)
1904                                 return 0;
1905                         else {
1906                                 ast_log(LOG_WARNING, "write failed: %s\n", strerror(errno));
1907                                 return -1;
1908                         }
1909                 }
1910                 if (!res)
1911                         return 0;
1912                 p->cidpos += res;
1913         }
1914         ast_free(p->cidspill);
1915         p->cidspill = NULL;
1916         if (p->callwaitcas) {
1917                 /* Wait for CID/CW to expire */
1918                 p->cidcwexpire = CIDCW_EXPIRE_SAMPLES;
1919         } else
1920                 restore_conference(p);
1921         return 0;
1922 }
1923
1924 static int zt_callwait(struct ast_channel *ast)
1925 {
1926         struct zt_pvt *p = ast->tech_pvt;
1927         p->callwaitingrepeat = CALLWAITING_REPEAT_SAMPLES;
1928         if (p->cidspill) {
1929                 ast_log(LOG_WARNING, "Spill already exists?!?\n");
1930                 ast_free(p->cidspill);
1931         }
1932         if (!(p->cidspill = ast_malloc(2400 /* SAS */ + 680 /* CAS */ + READ_SIZE * 4)))
1933                 return -1;
1934         save_conference(p);
1935         /* Silence */
1936         memset(p->cidspill, 0x7f, 2400 + 600 + READ_SIZE * 4);
1937         if (!p->callwaitrings && p->callwaitingcallerid) {
1938                 ast_gen_cas(p->cidspill, 1, 2400 + 680, AST_LAW(p));
1939                 p->callwaitcas = 1;
1940                 p->cidlen = 2400 + 680 + READ_SIZE * 4;
1941         } else {
1942                 ast_gen_cas(p->cidspill, 1, 2400, AST_LAW(p));
1943                 p->callwaitcas = 0;
1944                 p->cidlen = 2400 + READ_SIZE * 4;
1945         }
1946         p->cidpos = 0;
1947         send_callerid(p);
1948
1949         return 0;
1950 }
1951
1952 #ifdef HAVE_SS7
1953 static unsigned char cid_pres2ss7pres(int cid_pres)
1954 {
1955          return (cid_pres >> 5) & 0x03;
1956 }
1957
1958 static unsigned char cid_pres2ss7screen(int cid_pres)
1959 {
1960         return cid_pres & 0x03;
1961 }
1962 #endif
1963
1964 static int zt_call(struct ast_channel *ast, char *rdest, int timeout)
1965 {
1966         struct zt_pvt *p = ast->tech_pvt;
1967         int x, res, index,mysig;
1968         char *c, *n, *l;
1969 #ifdef HAVE_PRI
1970         char *s = NULL;
1971 #endif
1972         char dest[256]; /* must be same length as p->dialdest */
1973         ast_mutex_lock(&p->lock);
1974         ast_copy_string(dest, rdest, sizeof(dest));
1975         ast_copy_string(p->dialdest, rdest, sizeof(p->dialdest));
1976         if ((ast->_state == AST_STATE_BUSY)) {
1977                 p->subs[SUB_REAL].needbusy = 1;
1978                 ast_mutex_unlock(&p->lock);
1979                 return 0;
1980         }
1981         if ((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) {
1982                 ast_log(LOG_WARNING, "zt_call called on %s, neither down nor reserved\n", ast->name);
1983                 ast_mutex_unlock(&p->lock);
1984                 return -1;
1985         }
1986         p->dialednone = 0;
1987         if ((p->radio || (p->oprmode < 0)))  /* if a radio channel, up immediately */
1988         {
1989                 /* Special pseudo -- automatically up */
1990                 ast_setstate(ast, AST_STATE_UP);
1991                 ast_mutex_unlock(&p->lock);
1992                 return 0;
1993         }
1994         x = ZT_FLUSH_READ | ZT_FLUSH_WRITE;
1995         res = ioctl(p->subs[SUB_REAL].zfd, ZT_FLUSH, &x);
1996         if (res)
1997                 ast_log(LOG_WARNING, "Unable to flush input on channel %d\n", p->channel);
1998         p->outgoing = 1;
1999
2000         set_actual_gain(p->subs[SUB_REAL].zfd, 0, p->rxgain, p->txgain, p->law);
2001
2002         mysig = p->sig;
2003         if (p->outsigmod > -1)
2004                 mysig = p->outsigmod;
2005
2006         switch (mysig) {
2007         case SIG_FXOLS:
2008         case SIG_FXOGS:
2009         case SIG_FXOKS:
2010                 if (p->owner == ast) {
2011                         /* Normal ring, on hook */
2012
2013                         /* Don't send audio while on hook, until the call is answered */
2014                         p->dialing = 1;
2015                         if (p->use_callerid) {
2016                                 /* Generate the Caller-ID spill if desired */
2017                                 if (p->cidspill) {
2018                                         ast_log(LOG_WARNING, "cidspill already exists??\n");
2019                                         ast_free(p->cidspill);
2020                                 }
2021                                 p->callwaitcas = 0;
2022                                 if ((p->cidspill = ast_malloc(MAX_CALLERID_SIZE))) {
2023                                         p->cidlen = ast_callerid_generate(p->cidspill, ast->cid.cid_name, ast->cid.cid_num, AST_LAW(p));
2024                                         p->cidpos = 0;
2025                                         send_callerid(p);
2026                                 }
2027                         }
2028                         /* Choose proper cadence */
2029                         if ((p->distinctivering > 0) && (p->distinctivering <= num_cadence)) {
2030                                 if (ioctl(p->subs[SUB_REAL].zfd, ZT_SETCADENCE, &cadences[p->distinctivering - 1]))
2031                                         ast_log(LOG_WARNING, "Unable to set distinctive ring cadence %d on '%s'\n", p->distinctivering, ast->name);
2032                                 p->cidrings = cidrings[p->distinctivering - 1];
2033                         } else {
2034                                 if (ioctl(p->subs[SUB_REAL].zfd, ZT_SETCADENCE, NULL))
2035                                         ast_log(LOG_WARNING, "Unable to reset default ring on '%s'\n", ast->name);
2036                                 p->cidrings = p->sendcalleridafter;
2037                         }
2038
2039                         /* nick@dccinc.com 4/3/03 mods to allow for deferred dialing */
2040                         c = strchr(dest, '/');
2041                         if (c)
2042                                 c++;
2043                         if (c && (strlen(c) < p->stripmsd)) {
2044                                 ast_log(LOG_WARNING, "Number '%s' is shorter than stripmsd (%d)\n", c, p->stripmsd);
2045                                 c = NULL;
2046                         }
2047                         if (c) {
2048                                 p->dop.op = ZT_DIAL_OP_REPLACE;
2049                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "Tw%s", c);
2050                                 ast_debug(1, "FXO: setup deferred dialstring: %s\n", c);
2051                         } else {
2052                                 p->dop.dialstr[0] = '\0';
2053                         }
2054                         x = ZT_RING;
2055                         if (ioctl(p->subs[SUB_REAL].zfd, ZT_HOOK, &x) && (errno != EINPROGRESS)) {
2056                                 ast_log(LOG_WARNING, "Unable to ring phone: %s\n", strerror(errno));
2057                                 ast_mutex_unlock(&p->lock);
2058                                 return -1;
2059                         }
2060                         p->dialing = 1;
2061                 } else {
2062                         /* Call waiting call */
2063                         p->callwaitrings = 0;
2064                         if (ast->cid.cid_num)
2065                                 ast_copy_string(p->callwait_num, ast->cid.cid_num, sizeof(p->callwait_num));
2066                         else
2067                                 p->callwait_num[0] = '\0';
2068                         if (ast->cid.cid_name)
2069                                 ast_copy_string(p->callwait_name, ast->cid.cid_name, sizeof(p->callwait_name));
2070                         else
2071                                 p->callwait_name[0] = '\0';
2072                         /* Call waiting tone instead */
2073                         if (zt_callwait(ast)) {
2074                                 ast_mutex_unlock(&p->lock);
2075                                 return -1;
2076                         }
2077                         /* Make ring-back */
2078                         if (tone_zone_play_tone(p->subs[SUB_CALLWAIT].zfd, ZT_TONE_RINGTONE))
2079                                 ast_log(LOG_WARNING, "Unable to generate call-wait ring-back on channel %s\n", ast->name);
2080
2081                 }
2082                 n = ast->cid.cid_name;
2083                 l = ast->cid.cid_num;
2084                 if (l)
2085                         ast_copy_string(p->lastcid_num, l, sizeof(p->lastcid_num));
2086                 else
2087                         p->lastcid_num[0] = '\0';
2088                 if (n)
2089                         ast_copy_string(p->lastcid_name, n, sizeof(p->lastcid_name));
2090                 else
2091                         p->lastcid_name[0] = '\0';
2092                 ast_setstate(ast, AST_STATE_RINGING);
2093                 index = zt_get_index(ast, p, 0);
2094                 if (index > -1) {
2095                         p->subs[index].needringing = 1;
2096                 }
2097                 break;
2098         case SIG_FXSLS:
2099         case SIG_FXSGS:
2100         case SIG_FXSKS:
2101         case SIG_EMWINK:
2102         case SIG_EM:
2103         case SIG_EM_E1:
2104         case SIG_FEATD:
2105         case SIG_FEATDMF:
2106         case SIG_E911:
2107         case SIG_FGC_CAMA:
2108         case SIG_FGC_CAMAMF:
2109         case SIG_FEATB:
2110         case SIG_SFWINK:
2111         case SIG_SF:
2112         case SIG_SF_FEATD:
2113         case SIG_SF_FEATDMF:
2114         case SIG_FEATDMF_TA:
2115         case SIG_SF_FEATB:
2116                 c = strchr(dest, '/');
2117                 if (c)
2118                         c++;
2119                 else
2120                         c = "";
2121                 if (strlen(c) < p->stripmsd) {
2122                         ast_log(LOG_WARNING, "Number '%s' is shorter than stripmsd (%d)\n", c, p->stripmsd);
2123                         ast_mutex_unlock(&p->lock);
2124                         return -1;
2125                 }
2126 #ifdef HAVE_PRI
2127                 /* Start the trunk, if not GR-303 */
2128                 if (!p->pri) {
2129 #endif
2130                         x = ZT_START;
2131                         res = ioctl(p->subs[SUB_REAL].zfd, ZT_HOOK, &x);
2132                         if (res < 0) {
2133                                 if (errno != EINPROGRESS) {
2134                                         ast_log(LOG_WARNING, "Unable to start channel: %s\n", strerror(errno));
2135                                         ast_mutex_unlock(&p->lock);
2136                                         return -1;
2137                                 }
2138                         }
2139 #ifdef HAVE_PRI
2140                 }
2141 #endif
2142                 ast_debug(1, "Dialing '%s'\n", c);
2143                 p->dop.op = ZT_DIAL_OP_REPLACE;
2144
2145                 c += p->stripmsd;
2146
2147                 switch (mysig) {
2148                 case SIG_FEATD:
2149                         l = ast->cid.cid_num;
2150                         if (l)
2151                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "T*%s*%s*", l, c);
2152                         else
2153                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "T**%s*", c);
2154                         break;
2155                 case SIG_FEATDMF:
2156                         l = ast->cid.cid_num;
2157                         if (l)
2158                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "M*00%s#*%s#", l, c);
2159                         else
2160                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "M*02#*%s#", c);
2161                         break;
2162                 case SIG_FEATDMF_TA:
2163                 {
2164                         const char *cic, *ozz;
2165
2166                         /* If you have to go through a Tandem Access point you need to use this */
2167                         ozz = pbx_builtin_getvar_helper(p->owner, "FEATDMF_OZZ");
2168                         if (!ozz)
2169                                 ozz = defaultozz;
2170                         cic = pbx_builtin_getvar_helper(p->owner, "FEATDMF_CIC");
2171                         if (!cic)
2172                                 cic = defaultcic;
2173                         if (!ozz || !cic) {
2174                                 ast_log(LOG_WARNING, "Unable to dial channel of type feature group D MF tandem access without CIC or OZZ set\n");
2175                                 ast_mutex_unlock(&p->lock);
2176                                 return -1;
2177                         }
2178                         snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "M*%s%s#", ozz, cic);
2179                         snprintf(p->finaldial, sizeof(p->finaldial), "M*%s#", c);
2180                         p->whichwink = 0;
2181                 }
2182                         break;
2183                 case SIG_E911:
2184                         ast_copy_string(p->dop.dialstr, "M*911#", sizeof(p->dop.dialstr));
2185                         break;
2186                 case SIG_FGC_CAMA:
2187                         snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "P%s", c);
2188                         break;
2189                 case SIG_FGC_CAMAMF:
2190                 case SIG_FEATB:
2191                         snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "M*%s#", c);
2192                         break;
2193                 default:
2194                         if (p->pulse)
2195                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "P%sw", c);
2196                         else
2197                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "T%sw", c);
2198                         break;
2199                 }
2200
2201                 if (p->echotraining && (strlen(p->dop.dialstr) > 4)) {
2202                         memset(p->echorest, 'w', sizeof(p->echorest) - 1);
2203                         strcpy(p->echorest + (p->echotraining / 400) + 1, p->dop.dialstr + strlen(p->dop.dialstr) - 2);
2204                         p->echorest[sizeof(p->echorest) - 1] = '\0';
2205                         p->echobreak = 1;
2206                         p->dop.dialstr[strlen(p->dop.dialstr)-2] = '\0';
2207                 } else
2208                         p->echobreak = 0;
2209                 if (!res) {
2210                         if (ioctl(p->subs[SUB_REAL].zfd, ZT_DIAL, &p->dop)) {
2211                                 x = ZT_ONHOOK;
2212                                 ioctl(p->subs[SUB_REAL].zfd, ZT_HOOK, &x);
2213                                 ast_log(LOG_WARNING, "Dialing failed on channel %d: %s\n", p->channel, strerror(errno));
2214                                 ast_mutex_unlock(&p->lock);
2215                                 return -1;
2216                         }
2217                 } else
2218                         ast_debug(1, "Deferring dialing...\n");
2219
2220                 p->dialing = 1;
2221                 if (ast_strlen_zero(c))
2222                         p->dialednone = 1;
2223                 ast_setstate(ast, AST_STATE_DIALING);
2224                 break;
2225         case 0:
2226                 /* Special pseudo -- automatically up*/
2227                 ast_setstate(ast, AST_STATE_UP);
2228                 break;
2229         case SIG_PRI:
2230         case SIG_SS7:
2231                 /* We'll get it in a moment -- but use dialdest to store pre-setup_ack digits */
2232                 p->dialdest[0] = '\0';
2233                 break;
2234         default:
2235                 ast_debug(1, "not yet implemented\n");
2236                 ast_mutex_unlock(&p->lock);
2237                 return -1;
2238         }
2239 #ifdef HAVE_SS7
2240         if (p->ss7) {
2241                 char ss7_called_nai;
2242                 int called_nai_strip;
2243                 char ss7_calling_nai;
2244                 int calling_nai_strip;
2245                 const char *charge_str = NULL;
2246
2247                 c = strchr(dest, '/');
2248                 if (c)
2249                         c++;
2250                 else
2251                         c = dest;
2252
2253                 if (!p->hidecallerid) {
2254                         l = ast->cid.cid_num;
2255                 } else {
2256                         l = NULL;
2257                 }
2258
2259                 if (ss7_grab(p, p->ss7)) {
2260                         ast_log(LOG_WARNING, "Failed to grab SS7!\n");
2261                         ast_mutex_unlock(&p->lock);
2262                         return -1;
2263                 }
2264                 p->digital = IS_DIGITAL(ast->transfercapability);
2265                 p->ss7call = isup_new_call(p->ss7->ss7);
2266
2267                 if (!p->ss7call) {
2268                         ss7_rel(p->ss7);
2269                         ast_mutex_unlock(&p->lock);
2270                         ast_log(LOG_ERROR, "Unable to allocate new SS7 call!\n");
2271                         return -1;
2272                 }
2273
2274                 called_nai_strip = 0;
2275                 ss7_called_nai = p->ss7->called_nai;
2276                 if (ss7_called_nai == SS7_NAI_DYNAMIC) { /* compute dynamically */
2277                         if (strncmp(c + p->stripmsd, p->ss7->internationalprefix, strlen(p->ss7->internationalprefix)) == 0) {
2278                                 called_nai_strip = strlen(p->ss7->internationalprefix);
2279                                 ss7_called_nai = SS7_NAI_INTERNATIONAL;
2280                         } else if (strncmp(c + p->stripmsd, p->ss7->nationalprefix, strlen(p->ss7->nationalprefix)) == 0) {
2281                                 called_nai_strip = strlen(p->ss7->nationalprefix);
2282                                 ss7_called_nai = SS7_NAI_NATIONAL;
2283                         } else {
2284                                 ss7_called_nai = SS7_NAI_SUBSCRIBER;
2285                         }
2286                 }
2287                 isup_set_called(p->ss7call, c + p->stripmsd + called_nai_strip, ss7_called_nai, p->ss7->ss7);
2288
2289                 calling_nai_strip = 0;
2290                 ss7_calling_nai = p->ss7->calling_nai;
2291                 if ((l != NULL) && (ss7_calling_nai == SS7_NAI_DYNAMIC)) { /* compute dynamically */
2292                         if (strncmp(l, p->ss7->internationalprefix, strlen(p->ss7->internationalprefix)) == 0) {
2293                                 calling_nai_strip = strlen(p->ss7->internationalprefix);
2294                                 ss7_calling_nai = SS7_NAI_INTERNATIONAL;
2295                         } else if (strncmp(l, p->ss7->nationalprefix, strlen(p->ss7->nationalprefix)) == 0) {
2296                                 calling_nai_strip = strlen(p->ss7->nationalprefix);
2297                                 ss7_calling_nai = SS7_NAI_NATIONAL;
2298                         } else {
2299                                 ss7_calling_nai = SS7_NAI_SUBSCRIBER;
2300                         }
2301                 }
2302                 isup_set_calling(p->ss7call, l ? (l + calling_nai_strip) : NULL, ss7_calling_nai,
2303                         p->use_callingpres ? cid_pres2ss7pres(ast->cid.cid_pres) : (l ? SS7_PRESENTATION_ALLOWED : SS7_PRESENTATION_RESTRICTED),
2304                         p->use_callingpres ? cid_pres2ss7screen(ast->cid.cid_pres) : SS7_SCREENING_USER_PROVIDED );
2305
2306                 isup_set_oli(p->ss7call, ast->cid.cid_ani2);
2307                 isup_init_call(p->ss7->ss7, p->ss7call, p->cic, p->dpc);
2308
2309                 /* Set the charge number if it is set */
2310                 charge_str = pbx_builtin_getvar_helper(ast, "SS7_CHARGE_NUMBER");
2311                 if (charge_str)
2312                         isup_set_charge(p->ss7call, charge_str, SS7_ANI_CALLING_PARTY_SUB_NUMBER, 0x10);
2313
2314
2315                 isup_iam(p->ss7->ss7, p->ss7call);
2316                 ast_setstate(ast, AST_STATE_DIALING);
2317                 ss7_rel(p->ss7);
2318         }
2319 #endif /* HAVE_SS7 */
2320 #ifdef HAVE_PRI
2321         if (p->pri) {
2322                 struct pri_sr *sr;
2323 #ifdef SUPPORT_USERUSER
2324                 const char *useruser;
2325 #endif
2326                 int pridialplan;
2327                 int dp_strip;
2328                 int prilocaldialplan;
2329                 int ldp_strip;
2330                 int exclusive;
2331                 const char *rr_str;
2332                 int redirect_reason;
2333
2334                 c = strchr(dest, '/');
2335                 if (c)
2336                         c++;
2337                 else
2338                         c = dest;
2339
2340                 l = NULL;
2341                 n = NULL;
2342
2343                 if (!p->hidecallerid) {
2344                         l = ast->cid.cid_num;
2345                         if (!p->hidecalleridname) {
2346                                 n = ast->cid.cid_name;
2347                         }
2348                 }
2349
2350
2351                 if (strlen(c) < p->stripmsd) {
2352                         ast_log(LOG_WARNING, "Number '%s' is shorter than stripmsd (%d)\n", c, p->stripmsd);
2353                         ast_mutex_unlock(&p->lock);
2354                         return -1;
2355                 }
2356                 if (mysig != SIG_FXSKS) {
2357                         p->dop.op = ZT_DIAL_OP_REPLACE;
2358                         s = strchr(c + p->stripmsd, 'w');
2359                         if (s) {
2360                                 if (strlen(s) > 1)
2361                                         snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "T%s", s);
2362                                 else
2363                                         p->dop.dialstr[0] = '\0';
2364                                 *s = '\0';
2365                         } else {
2366                                 p->dop.dialstr[0] = '\0';
2367                         }
2368                 }
2369                 if (pri_grab(p, p->pri)) {
2370                         ast_log(LOG_WARNING, "Failed to grab PRI!\n");
2371                         ast_mutex_unlock(&p->lock);
2372                         return -1;
2373                 }
2374                 if (!(p->call = pri_new_call(p->pri->pri))) {
2375                         ast_log(LOG_WARNING, "Unable to create call on channel %d\n", p->channel);
2376                         pri_rel(p->pri);
2377                         ast_mutex_unlock(&p->lock);
2378                         return -1;
2379                 }
2380                 if (!(sr = pri_sr_new())) {
2381                         ast_log(LOG_WARNING, "Failed to allocate setup request channel %d\n", p->channel);
2382                         pri_rel(p->pri);
2383                         ast_mutex_unlock(&p->lock);
2384                 }
2385                 if (p->bearer || (mysig == SIG_FXSKS)) {
2386                         if (p->bearer) {
2387                                 ast_debug(1, "Oooh, I have a bearer on %d (%d:%d)\n", PVT_TO_CHANNEL(p->bearer), p->bearer->logicalspan, p->bearer->channel);
2388                                 p->bearer->call = p->call;
2389                         } else
2390                                 ast_debug(1, "I'm being setup with no bearer right now...\n");
2391
2392                         pri_set_crv(p->pri->pri, p->call, p->channel, 0);
2393                 }
2394                 p->digital = IS_DIGITAL(ast->transfercapability);
2395                 /* Add support for exclusive override */
2396                 if (p->priexclusive)
2397                         exclusive = 1;
2398                 else {
2399                 /* otherwise, traditional behavior */
2400                         if (p->pri->nodetype == PRI_NETWORK)
2401                                 exclusive = 0;
2402                         else
2403                                 exclusive = 1;
2404                 }
2405
2406                 pri_sr_set_channel(sr, p->bearer ? PVT_TO_CHANNEL(p->bearer) : PVT_TO_CHANNEL(p), exclusive, 1);
2407                 pri_sr_set_bearer(sr, p->digital ? PRI_TRANS_CAP_DIGITAL : ast->transfercapability,
2408                                         (p->digital ? -1 :
2409                                                 ((p->law == ZT_LAW_ALAW) ? PRI_LAYER_1_ALAW : PRI_LAYER_1_ULAW)));
2410                 if (p->pri->facilityenable)
2411                         pri_facility_enable(p->pri->pri);
2412
2413                 ast_verb(3, "Requested transfer capability: 0x%.2x - %s\n", ast->transfercapability, ast_transfercapability2str(ast->transfercapability));
2414                 dp_strip = 0;
2415                 pridialplan = p->pri->dialplan - 1;
2416                 if (pridialplan == -2 || pridialplan == -3) { /* compute dynamically */
2417                         if (strncmp(c + p->stripmsd, p->pri->internationalprefix, strlen(p->pri->internationalprefix)) == 0) {
2418                                 if (pridialplan == -2) {
2419                                         dp_strip = strlen(p->pri->internationalprefix);
2420                                 }
2421                                 pridialplan = PRI_INTERNATIONAL_ISDN;
2422                         } else if (strncmp(c + p->stripmsd, p->pri->nationalprefix, strlen(p->pri->nationalprefix)) == 0) {
2423                                 if (pridialplan == -2) {
2424                                         dp_strip = strlen(p->pri->nationalprefix);
2425                                 }
2426                                 pridialplan = PRI_NATIONAL_ISDN;
2427                         } else {
2428                                 pridialplan = PRI_LOCAL_ISDN;
2429                         }
2430                 }
2431                 pri_sr_set_called(sr, c + p->stripmsd + dp_strip, pridialplan, s ? 1 : 0);
2432
2433                 ldp_strip = 0;
2434                 prilocaldialplan = p->pri->localdialplan - 1;
2435                 if ((l != NULL) && (prilocaldialplan == -2 || prilocaldialplan == -3)) { /* compute dynamically */
2436                         if (strncmp(l, p->pri->internationalprefix, strlen(p->pri->internationalprefix)) == 0) {
2437                                 if (prilocaldialplan == -2) {
2438                                         ldp_strip = strlen(p->pri->internationalprefix);
2439                                 }
2440                                 prilocaldialplan = PRI_INTERNATIONAL_ISDN;
2441                         } else if (strncmp(l, p->pri->nationalprefix, strlen(p->pri->nationalprefix)) == 0) {
2442                                 if (prilocaldialplan == -2) {
2443                                         ldp_strip = strlen(p->pri->nationalprefix);
2444                                 }
2445                                 prilocaldialplan = PRI_NATIONAL_ISDN;
2446                         } else {
2447                                 prilocaldialplan = PRI_LOCAL_ISDN;
2448                         }
2449                 }
2450                 pri_sr_set_caller(sr, l ? (l + ldp_strip) : NULL, n, prilocaldialplan,
2451                         p->use_callingpres ? ast->cid.cid_pres : (l ? PRES_ALLOWED_USER_NUMBER_PASSED_SCREEN : PRES_NUMBER_NOT_AVAILABLE));
2452                 if ((rr_str = pbx_builtin_getvar_helper(ast, "PRIREDIRECTREASON"))) {
2453                         if (!strcasecmp(rr_str, "UNKNOWN"))
2454                                 redirect_reason = 0;
2455                         else if (!strcasecmp(rr_str, "BUSY"))
2456                                 redirect_reason = 1;
2457                         else if (!strcasecmp(rr_str, "NO_REPLY"))
2458                                 redirect_reason = 2;
2459                         else if (!strcasecmp(rr_str, "UNCONDITIONAL"))
2460                                 redirect_reason = 15;
2461                         else
2462                                 redirect_reason = PRI_REDIR_UNCONDITIONAL;
2463                 } else
2464                         redirect_reason = PRI_REDIR_UNCONDITIONAL;
2465                 pri_sr_set_redirecting(sr, ast->cid.cid_rdnis, p->pri->localdialplan - 1, PRES_ALLOWED_USER_NUMBER_PASSED_SCREEN, redirect_reason);
2466
2467 #ifdef SUPPORT_USERUSER
2468                 /* User-user info */
2469                 useruser = pbx_builtin_getvar_helper(p->owner, "USERUSERINFO");
2470
2471                 if (useruser)
2472                         pri_sr_set_useruser(sr, useruser);
2473 #endif
2474
2475                 if (pri_setup(p->pri->pri, p->call, sr)) {
2476                         ast_log(LOG_WARNING, "Unable to setup call to %s (using %s)\n",
2477                                 c + p->stripmsd + dp_strip, dialplan2str(p->pri->dialplan));
2478                         pri_rel(p->pri);
2479                         ast_mutex_unlock(&p->lock);
2480                         pri_sr_free(sr);
2481                         return -1;
2482                 }
2483                 pri_sr_free(sr);
2484                 ast_setstate(ast, AST_STATE_DIALING);
2485                 pri_rel(p->pri);
2486         }
2487 #endif
2488         ast_mutex_unlock(&p->lock);
2489         return 0;
2490 }
2491
2492 static void destroy_zt_pvt(struct zt_pvt **pvt)
2493 {
2494         struct zt_pvt *p = *pvt;
2495         /* Remove channel from the list */
2496         if (p->prev)
2497                 p->prev->next = p->next;
2498         if (p->next)
2499                 p->next->prev = p->prev;
2500         if (p->use_smdi)
2501                 ASTOBJ_UNREF(p->smdi_iface, ast_smdi_interface_destroy);
2502         if (p->mwi_event_sub)
2503                 ast_event_unsubscribe(p->mwi_event_sub);
2504         if (p->vars)
2505                 ast_variables_destroy(p->vars);
2506         ast_mutex_destroy(&p->lock);
2507         ast_free(p);
2508         *pvt = NULL;
2509 }
2510
2511 static int destroy_channel(struct zt_pvt *prev, struct zt_pvt *cur, int now)
2512 {
2513         int owned = 0;
2514         int i = 0;
2515
2516         if (!now) {
2517                 if (cur->owner) {
2518                         owned = 1;
2519                 }
2520
2521                 for (i = 0; i < 3; i++) {
2522                         if (cur->subs[i].owner) {
2523                                 owned = 1;
2524                         }
2525                 }
2526                 if (!owned) {
2527                         if (prev) {
2528                                 prev->next = cur->next;
2529                                 if (prev->next)
2530                                         prev->next->prev = prev;
2531                                 else
2532                                         ifend = prev;
2533                         } else {
2534                                 iflist = cur->next;
2535                                 if (iflist)
2536                                         iflist->prev = NULL;
2537                                 else
2538                                         ifend = NULL;
2539                         }
2540                         if (cur->subs[SUB_REAL].zfd > -1) {
2541                                 zt_close(cur->subs[SUB_REAL].zfd);
2542                         }
2543                         destroy_zt_pvt(&cur);
2544                 }
2545         } else {
2546                 if (prev) {
2547                         prev->next = cur->next;
2548                         if (prev->next)
2549                                 prev->next->prev = prev;
2550                         else
2551                                 ifend = prev;
2552                 } else {
2553                         iflist = cur->next;
2554                         if (iflist)
2555                                 iflist->prev = NULL;
2556                         else
2557                                 ifend = NULL;
2558                 }
2559                 if (cur->subs[SUB_REAL].zfd > -1) {
2560                         zt_close(cur->subs[SUB_REAL].zfd);
2561                 }
2562                 destroy_zt_pvt(&cur);
2563         }
2564         return 0;
2565 }
2566
2567 #ifdef HAVE_PRI
2568 static char *zap_send_keypad_facility_app = "ZapSendKeypadFacility";
2569
2570 static char *zap_send_keypad_facility_synopsis = "Send digits out of band over a PRI";
2571
2572 static char *zap_send_keypad_facility_descrip =
2573 "  ZapSendKeypadFacility(): This application will send the given string of digits in a Keypad Facility\n"
2574 "  IE over the current channel.\n";
2575
2576 static int zap_send_keypad_facility_exec(struct ast_channel *chan, void *data)
2577 {
2578         /* Data will be our digit string */
2579         struct zt_pvt *p;
2580         char *digits = (char *) data;
2581
2582         if (ast_strlen_zero(digits)) {
2583                 ast_debug(1, "No digit string sent to application!\n");
2584                 return -1;
2585         }
2586
2587         p = (struct zt_pvt *)chan->tech_pvt;
2588
2589         if (!p) {
2590                 ast_debug(1, "Unable to find technology private\n");
2591                 return -1;
2592         }
2593
2594         ast_mutex_lock(&p->lock);
2595
2596         if (!p->pri || !p->call) {
2597                 ast_debug(1, "Unable to find pri or call on channel!\n");
2598                 ast_mutex_unlock(&p->lock);
2599                 return -1;
2600         }
2601
2602         if (!pri_grab(p, p->pri)) {
2603                 pri_keypad_facility(p->pri->pri, p->call, digits);
2604                 pri_rel(p->pri);
2605         } else {
2606                 ast_debug(1, "Unable to grab pri to send keypad facility!\n");
2607                 ast_mutex_unlock(&p->lock);
2608                 return -1;
2609         }
2610
2611         ast_mutex_unlock(&p->lock);
2612
2613         return 0;
2614 }
2615
2616 static int pri_is_up(struct zt_pri *pri)
2617 {
2618         int x;
2619         for (x = 0; x < NUM_DCHANS; x++) {
2620                 if (pri->dchanavail[x] == DCHAN_AVAILABLE)
2621                         return 1;
2622         }
2623         return 0;
2624 }
2625
2626 static int pri_assign_bearer(struct zt_pvt *crv, struct zt_pri *pri, struct zt_pvt *bearer)
2627 {
2628         bearer->owner = &inuse;
2629         bearer->realcall = crv;
2630         crv->subs[SUB_REAL].zfd = bearer->subs[SUB_REAL].zfd;
2631         if (crv->subs[SUB_REAL].owner)
2632                 ast_channel_set_fd(crv->subs[SUB_REAL].owner, 0, crv->subs[SUB_REAL].zfd);
2633         crv->bearer = bearer;
2634         crv->call = bearer->call;
2635         crv->pri = pri;
2636         return 0;
2637 }
2638
2639 static char *pri_order(int level)
2640 {
2641         switch (level) {
2642         case 0:
2643                 return "Primary";
2644         case 1:
2645                 return "Secondary";
2646         case 2:
2647                 return "Tertiary";
2648         case 3:
2649                 return "Quaternary";
2650         default:
2651                 return "<Unknown>";
2652         }
2653 }
2654
2655 /* Returns fd of the active dchan */
2656 static int pri_active_dchan_fd(struct zt_pri *pri)
2657 {
2658         int x = -1;
2659
2660         for (x = 0; x < NUM_DCHANS; x++) {
2661                 if ((pri->dchans[x] == pri->pri))
2662                         break;
2663         }
2664
2665         return pri->fds[x];
2666 }
2667
2668 static int pri_find_dchan(struct zt_pri *pri)
2669 {
2670         int oldslot = -1;
2671         struct pri *old;
2672         int newslot = -1;
2673         int x;
2674         old = pri->pri;
2675         for (x = 0; x < NUM_DCHANS; x++) {
2676                 if ((pri->dchanavail[x] == DCHAN_AVAILABLE) && (newslot < 0))
2677                         newslot = x;
2678                 if (pri->dchans[x] == old) {
2679                         oldslot = x;
2680                 }
2681         }
2682         if (newslot < 0) {
2683                 newslot = 0;
2684                 ast_log(LOG_WARNING, "No D-channels available!  Using Primary channel %d as D-channel anyway!\n",
2685                         pri->dchannels[newslot]);
2686         }
2687         if (old && (oldslot != newslot))
2688                 ast_log(LOG_NOTICE, "Switching from from d-channel %d to channel %d!\n",
2689                         pri->dchannels[oldslot], pri->dchannels[newslot]);
2690         pri->pri = pri->dchans[newslot];
2691         return 0;
2692 }
2693 #endif
2694
2695 static int zt_hangup(struct ast_channel *ast)
2696 {
2697         int res;
2698         int index,x, law;
2699         /*static int restore_gains(struct zt_pvt *p);*/
2700         struct zt_pvt *p = ast->tech_pvt;
2701         struct zt_pvt *tmp = NULL;
2702         struct zt_pvt *prev = NULL;
2703         ZT_PARAMS par;
2704
2705         ast_debug(1, "zt_hangup(%s)\n", ast->name);
2706         if (!ast->tech_pvt) {
2707                 ast_log(LOG_WARNING, "Asked to hangup channel not connected\n");
2708                 return 0;
2709         }
2710
2711         ast_mutex_lock(&p->lock);
2712
2713         index = zt_get_index(ast, p, 1);
2714
2715         if ((p->sig == SIG_PRI) || (p->sig == SIG_SS7)) {
2716                 x = 1;
2717                 ast_channel_setoption(ast,AST_OPTION_AUDIO_MODE,&x,sizeof(char),0);
2718         }
2719
2720         x = 0;
2721         zt_confmute(p, 0);
2722         restore_gains(p);
2723         if (p->origcid_num) {
2724                 ast_copy_string(p->cid_num, p->origcid_num, sizeof(p->cid_num));
2725                 ast_free(p->origcid_num);
2726                 p->origcid_num = NULL;
2727         }
2728         if (p->origcid_name) {
2729                 ast_copy_string(p->cid_name, p->origcid_name, sizeof(p->cid_name));
2730                 ast_free(p->origcid_name);
2731                 p->origcid_name = NULL;
2732         }
2733         if (p->dsp)
2734                 ast_dsp_digitmode(p->dsp,DSP_DIGITMODE_DTMF | p->dtmfrelax);
2735         if (p->exten)
2736                 p->exten[0] = '\0';
2737
2738         ast_debug(1, "Hangup: channel: %d index = %d, normal = %d, callwait = %d, thirdcall = %d\n",
2739                 p->channel, index, p->subs[SUB_REAL].zfd, p->subs[SUB_CALLWAIT].zfd, p->subs[SUB_THREEWAY].zfd);
2740         p->ignoredtmf = 0;
2741
2742         if (index > -1) {
2743                 /* Real channel, do some fixup */
2744                 p->subs[index].owner = NULL;
2745                 p->subs[index].needanswer = 0;
2746                 p->subs[index].needflash = 0;
2747                 p->subs[index].needringing = 0;
2748                 p->subs[index].needbusy = 0;
2749                 p->subs[index].needcongestion = 0;
2750                 p->subs[index].linear = 0;
2751                 p->subs[index].needcallerid = 0;
2752                 p->polarity = POLARITY_IDLE;
2753                 zt_setlinear(p->subs[index].zfd, 0);
2754                 if (index == SUB_REAL) {
2755                         if ((p->subs[SUB_CALLWAIT].zfd > -1) && (p->subs[SUB_THREEWAY].zfd > -1)) {
2756                                 ast_debug(1, "Normal call hung up with both three way call and a call waiting call in place?\n");
2757                                 if (p->subs[SUB_CALLWAIT].inthreeway) {
2758                                         /* We had flipped over to answer a callwait and now it's gone */
2759                                         ast_debug(1, "We were flipped over to the callwait, moving back and unowning.\n");
2760                                         /* Move to the call-wait, but un-own us until they flip back. */
2761                                         swap_subs(p, SUB_CALLWAIT, SUB_REAL);
2762                                         unalloc_sub(p, SUB_CALLWAIT);
2763                                         p->owner = NULL;
2764                                 } else {
2765                                         /* The three way hung up, but we still have a call wait */
2766                                         ast_debug(1, "We were in the threeway and have a callwait still.  Ditching the threeway.\n");
2767                                         swap_subs(p, SUB_THREEWAY, SUB_REAL);
2768                                         unalloc_sub(p, SUB_THREEWAY);
2769                                         if (p->subs[SUB_REAL].inthreeway) {
2770                                                 /* This was part of a three way call.  Immediately make way for
2771                                                    another call */
2772                                                 ast_debug(1, "Call was complete, setting owner to former third call\n");
2773                                                 p->owner = p->subs[SUB_REAL].owner;
2774                                         } else {
2775                                                 /* This call hasn't been completed yet...  Set owner to NULL */
2776                                                 ast_debug(1, "Call was incomplete, setting owner to NULL\n");
2777                                                 p->owner = NULL;
2778                                         }
2779                                         p->subs[SUB_REAL].inthreeway = 0;
2780                                 }
2781                         } else if (p->subs[SUB_CALLWAIT].zfd > -1) {
2782                                 /* Move to the call-wait and switch back to them. */
2783                                 swap_subs(p, SUB_CALLWAIT, SUB_REAL);
2784                                 unalloc_sub(p, SUB_CALLWAIT);
2785                                 p->owner = p->subs[SUB_REAL].owner;
2786                                 if (p->owner->_state != AST_STATE_UP)
2787                                         p->subs[SUB_REAL].needanswer = 1;
2788                                 if (ast_bridged_channel(p->subs[SUB_REAL].owner))
2789                                         ast_queue_control(p->subs[SUB_REAL].owner, AST_CONTROL_UNHOLD);
2790                         } else if (p->subs[SUB_THREEWAY].zfd > -1) {
2791                                 swap_subs(p, SUB_THREEWAY, SUB_REAL);
2792                                 unalloc_sub(p, SUB_THREEWAY);
2793                                 if (p->subs[SUB_REAL].inthreeway) {
2794                                         /* This was part of a three way call.  Immediately make way for
2795                                            another call */
2796                                         ast_debug(1, "Call was complete, setting owner to former third call\n");
2797                                         p->owner = p->subs[SUB_REAL].owner;
2798                                 } else {
2799                                         /* This call hasn't been completed yet...  Set owner to NULL */
2800                                         ast_debug(1, "Call was incomplete, setting owner to NULL\n");
2801                                         p->owner = NULL;
2802                                 }
2803                                 p->subs[SUB_REAL].inthreeway = 0;
2804                         }
2805                 } else if (index == SUB_CALLWAIT) {
2806                         /* Ditch the holding callwait call, and immediately make it availabe */
2807                         if (p->subs[SUB_CALLWAIT].inthreeway) {
2808                                 /* This is actually part of a three way, placed on hold.  Place the third part
2809                                    on music on hold now */
2810                                 if (p->subs[SUB_THREEWAY].owner && ast_bridged_channel(p->subs[SUB_THREEWAY].owner)) {
2811                                         ast_queue_control_data(p->subs[SUB_THREEWAY].owner, AST_CONTROL_HOLD,
2812                                                 S_OR(p->mohsuggest, NULL),
2813                                                 !ast_strlen_zero(p->mohsuggest) ? strlen(p->mohsuggest) + 1 : 0);
2814                                 }
2815                                 p->subs[SUB_THREEWAY].inthreeway = 0;
2816                                 /* Make it the call wait now */
2817                                 swap_subs(p, SUB_CALLWAIT, SUB_THREEWAY);
2818                                 unalloc_sub(p, SUB_THREEWAY);
2819                         } else
2820                                 unalloc_sub(p, SUB_CALLWAIT);
2821                 } else if (index == SUB_THREEWAY) {
2822                         if (p->subs[SUB_CALLWAIT].inthreeway) {
2823                                 /* The other party of the three way call is currently in a call-wait state.
2824                                    Start music on hold for them, and take the main guy out of the third call */
2825                                 if (p->subs[SUB_CALLWAIT].owner && ast_bridged_channel(p->subs[SUB_CALLWAIT].owner)) {
2826                                         ast_queue_control_data(p->subs[SUB_CALLWAIT].owner, AST_CONTROL_HOLD,
2827                                                 S_OR(p->mohsuggest, NULL),
2828                                                 !ast_strlen_zero(p->mohsuggest) ? strlen(p->mohsuggest) + 1 : 0);
2829                                 }
2830                                 p->subs[SUB_CALLWAIT].inthreeway = 0;
2831                         }
2832                         p->subs[SUB_REAL].inthreeway = 0;
2833                         /* If this was part of a three way call index, let us make
2834                            another three way call */
2835                         unalloc_sub(p, SUB_THREEWAY);
2836                 } else {
2837                         /* This wasn't any sort of call, but how are we an index? */
2838                         ast_log(LOG_WARNING, "Index found but not any type of call?\n");
2839                 }
2840         }
2841
2842         if (!p->subs[SUB_REAL].owner && !p->subs[SUB_CALLWAIT].owner && !p->subs[SUB_THREEWAY].owner) {
2843                 p->owner = NULL;
2844                 p->ringt = 0;
2845                 p->distinctivering = 0;
2846                 p->confirmanswer = 0;
2847                 p->cidrings = 1;
2848                 p->outgoing = 0;
2849                 p->digital = 0;
2850                 p->faxhandled = 0;
2851                 p->pulsedial = 0;
2852                 p->onhooktime = time(NULL);
2853 #ifdef HAVE_PRI
2854                 p->proceeding = 0;
2855                 p->progress = 0;
2856                 p->alerting = 0;
2857                 p->setup_ack = 0;
2858 #endif
2859                 if (p->dsp) {
2860                         ast_dsp_free(p->dsp);
2861                         p->dsp = NULL;
2862                 }
2863
2864                 law = ZT_LAW_DEFAULT;
2865                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_SETLAW, &law);
2866                 if (res < 0)
2867                         ast_log(LOG_WARNING, "Unable to set law on channel %d to default\n", p->channel);
2868                 /* Perform low level hangup if no owner left */
2869 #ifdef HAVE_SS7
2870                 if (p->ss7) {
2871                         if (p->ss7call) {
2872                                 if (!ss7_grab(p, p->ss7)) {
2873                                         if (!p->alreadyhungup) {
2874                                                 const char *cause = pbx_builtin_getvar_helper(ast,"SS7_CAUSE");
2875                                                 int icause = ast->hangupcause ? ast->hangupcause : -1;
2876
2877                                                 if (cause) {
2878                                                         if (atoi(cause))
2879                                                                 icause = atoi(cause);
2880                                                 }
2881                                                 isup_rel(p->ss7->ss7, p->ss7call, icause);
2882                                                 ss7_rel(p->ss7);
2883                                                 p->alreadyhungup = 1;
2884                                         } else
2885                                                 ast_log(LOG_WARNING, "Trying to hangup twice!\n");
2886                                 } else {
2887                                         ast_log(LOG_WARNING, "Unable to grab SS7 on CIC %d\n", p->cic);
2888                                         res = -1;
2889                                 }
2890                         }
2891                 }
2892 #endif
2893 #ifdef HAVE_PRI
2894                 if (p->pri) {
2895 #ifdef SUPPORT_USERUSER
2896                         const char *useruser = pbx_builtin_getvar_helper(ast,"USERUSERINFO");
2897 #endif
2898
2899                         /* Make sure we have a call (or REALLY have a call in the case of a PRI) */
2900                         if (p->call && (!p->bearer || (p->bearer->call == p->call))) {
2901                                 if (!pri_grab(p, p->pri)) {
2902                                         if (p->alreadyhungup) {
2903                                                 ast_debug(1, "Already hungup...  Calling hangup once, and clearing call\n");
2904
2905 #ifdef SUPPORT_USERUSER
2906                                                 pri_call_set_useruser(p->call, useruser);
2907 #endif
2908
2909                                                 pri_hangup(p->pri->pri, p->call, -1);
2910                                                 p->call = NULL;
2911                                                 if (p->bearer)
2912                                                         p->bearer->call = NULL;
2913                                         } else {
2914                                                 const char *cause = pbx_builtin_getvar_helper(ast,"PRI_CAUSE");
2915                                                 int icause = ast->hangupcause ? ast->hangupcause : -1;
2916                                                 ast_debug(1, "Not yet hungup...  Calling hangup once with icause, and clearing call\n");
2917
2918 #ifdef SUPPORT_USERUSER
2919                                                 pri_call_set_useruser(p->call, useruser);
2920 #endif
2921
2922                                                 p->alreadyhungup = 1;
2923                                                 if (p->bearer)
2924                                                         p->bearer->alreadyhungup = 1;
2925                                                 if (cause) {
2926                                                         if (atoi(cause))
2927                                                                 icause = atoi(cause);
2928                                                 }
2929                                                 pri_hangup(p->pri->pri, p->call, icause);
2930                                         }
2931                                         if (res < 0)
2932                                                 ast_log(LOG_WARNING, "pri_disconnect failed\n");
2933                                         pri_rel(p->pri);
2934                                 } else {
2935                                         ast_log(LOG_WARNING, "Unable to grab PRI on span %d\n", p->span);
2936                                         res = -1;
2937                                 }
2938                         } else {
2939                                 if (p->bearer)
2940                                         ast_debug(1, "Bearer call is %p, while ours is still %p\n", p->bearer->call, p->call);
2941                                 p->call = NULL;
2942                                 res = 0;
2943                         }
2944                 }
2945 #endif
2946                 if (p->sig && ((p->sig != SIG_PRI) && (p->sig != SIG_SS7)))
2947                         res = zt_set_hook(p->subs[SUB_REAL].zfd, ZT_ONHOOK);
2948                 if (res < 0) {
2949                         ast_log(LOG_WARNING, "Unable to hangup line %s\n", ast->name);
2950                 }
2951                 switch (p->sig) {
2952                 case SIG_FXOGS:
2953                 case SIG_FXOLS:
2954                 case SIG_FXOKS:
2955                         res = ioctl(p->subs[SUB_REAL].zfd, ZT_GET_PARAMS, &par);
2956                         if (!res) {
2957 #if 0
2958                                 ast_debug(1, "Hanging up channel %d, offhook = %d\n", p->channel, par.rxisoffhook);
2959 #endif
2960                                 /* If they're off hook, try playing congestion */
2961                                 if ((par.rxisoffhook) && (!(p->radio || (p->oprmode < 0))))
2962                                         tone_zone_play_tone(p->subs[SUB_REAL].zfd, ZT_TONE_CONGESTION);
2963                                 else
2964                                         tone_zone_play_tone(p->subs[SUB_REAL].zfd, -1);
2965                         }
2966                         break;
2967                 case SIG_FXSGS:
2968                 case SIG_FXSLS:
2969                 case SIG_FXSKS:
2970                         /* Make sure we're not made available for at least two seconds assuming
2971                            we were actually used for an inbound or outbound call. */
2972                         if (ast->_state != AST_STATE_RESERVED) {
2973                                 time(&p->guardtime);
2974                                 p->guardtime += 2;
2975                         }
2976                         break;
2977                 default:
2978                         tone_zone_play_tone(p->subs[SUB_REAL].zfd, -1);
2979                 }
2980                 if (p->cidspill)
2981                         ast_free(p->cidspill);
2982                 if (p->sig)
2983                         zt_disable_ec(p);
2984                 x = 0;
2985                 ast_channel_setoption(ast,AST_OPTION_TONE_VERIFY,&x,sizeof(char),0);
2986                 ast_channel_setoption(ast,AST_OPTION_TDD,&x,sizeof(char),0);
2987                 p->didtdd = 0;
2988                 p->cidspill = NULL;
2989                 p->callwaitcas = 0;
2990                 p->callwaiting = p->permcallwaiting;
2991                 p->hidecallerid = p->permhidecallerid;
2992                 p->dialing = 0;
2993                 p->rdnis[0] = '\0';
2994                 update_conf(p);
2995                 reset_conf(p);
2996                 /* Restore data mode */
2997                 if ((p->sig == SIG_PRI) || (p->sig == SIG_SS7)) {
2998                         x = 0;
2999                         ast_channel_setoption(ast,AST_OPTION_AUDIO_MODE,&x,sizeof(char),0);
3000                 }
3001 #ifdef HAVE_PRI
3002                 if (p->bearer) {
3003                         ast_debug(1, "Freeing up bearer channel %d\n", p->bearer->channel);
3004                         /* Free up the bearer channel as well, and
3005                            don't use its file descriptor anymore */
3006                         update_conf(p->bearer);
3007                         reset_conf(p->bearer);
3008                         p->bearer->owner = NULL;
3009                         p->bearer->realcall = NULL;
3010                         p->bearer = NULL;
3011                         p->subs[SUB_REAL].zfd = -1;
3012                         p->pri = NULL;
3013                 }
3014 #endif
3015                 restart_monitor();
3016         }
3017
3018         p->callwaitingrepeat = 0;
3019         p->cidcwexpire = 0;
3020         p->oprmode = 0;
3021         ast->tech_pvt = NULL;
3022         ast_mutex_unlock(&p->lock);
3023         ast_module_unref(ast_module_info->self);
3024         ast_verb(3, "Hungup '%s'\n", ast->name);
3025
3026         ast_mutex_lock(&iflock);
3027         tmp = iflist;
3028         prev = NULL;
3029         if (p->destroy) {
3030                 while (tmp) {
3031                         if (tmp == p) {
3032                                 destroy_channel(prev, tmp, 0);
3033                                 break;
3034                         } else {
3035                                 prev = tmp;
3036                                 tmp = tmp->next;
3037                         }
3038                 }
3039         }
3040         ast_mutex_unlock(&iflock);
3041         return 0;
3042 }
3043
3044 static int zt_answer(struct ast_channel *ast)
3045 {
3046         struct zt_pvt *p = ast->tech_pvt;
3047         int res = 0;
3048         int index;
3049         int oldstate = ast->_state;
3050         ast_setstate(ast, AST_STATE_UP);
3051         ast_mutex_lock(&p->lock);
3052         index = zt_get_index(ast, p, 0);
3053         if (index < 0)
3054                 index = SUB_REAL;
3055         /* nothing to do if a radio channel */
3056         if ((p->radio || (p->oprmode < 0))) {
3057                 ast_mutex_unlock(&p->lock);
3058                 return 0;
3059         }
3060         switch (p->sig) {
3061         case SIG_FXSLS:
3062         case SIG_FXSGS:
3063         case SIG_FXSKS:
3064                 p->ringt = 0;
3065                 /* Fall through */
3066         case SIG_EM:
3067         case SIG_EM_E1:
3068         case SIG_EMWINK:
3069         case SIG_FEATD:
3070         case SIG_FEATDMF:
3071         case SIG_FEATDMF_TA:
3072         case SIG_E911:
3073         case SIG_FGC_CAMA:
3074         case SIG_FGC_CAMAMF:
3075         case SIG_FEATB:
3076         case SIG_SF:
3077         case SIG_SFWINK:
3078         case SIG_SF_FEATD:
3079         case SIG_SF_FEATDMF:
3080         case SIG_SF_FEATB:
3081         case SIG_FXOLS:
3082         case SIG_FXOGS:
3083         case SIG_FXOKS:
3084                 /* Pick up the line */
3085                 ast_debug(1, "Took %s off hook\n", ast->name);
3086                 if (p->hanguponpolarityswitch) {
3087                         p->polaritydelaytv = ast_tvnow();
3088                 }
3089                 res = zt_set_hook(p->subs[SUB_REAL].zfd, ZT_OFFHOOK);
3090                 tone_zone_play_tone(p->subs[index].zfd, -1);
3091                 p->dialing = 0;
3092                 if ((index == SUB_REAL) && p->subs[SUB_THREEWAY].inthreeway) {
3093                         if (oldstate == AST_STATE_RINGING) {
3094                                 ast_debug(1, "Finally swapping real and threeway\n");
3095                                 tone_zone_play_tone(p->subs[SUB_THREEWAY].zfd, -1);
3096                                 swap_subs(p, SUB_THREEWAY, SUB_REAL);
3097                                 p->owner = p->subs[SUB_REAL].owner;
3098                         }
3099                 }
3100                 if (p->sig & __ZT_SIG_FXS) {
3101                         zt_enable_ec(p);
3102                         zt_train_ec(p);
3103                 }
3104                 break;
3105 #ifdef HAVE_PRI
3106         case SIG_PRI:
3107                 /* Send a pri acknowledge */
3108                 if (!pri_grab(p, p->pri)) {
3109                         p->proceeding = 1;
3110                         res = pri_answer(p->pri->pri, p->call, 0, !p->digital);
3111                         pri_rel(p->pri);
3112                 } else {
3113                         ast_log(LOG_WARNING, "Unable to grab PRI on span %d\n", p->span);
3114                         res = -1;
3115                 }
3116                 break;
3117 #endif
3118 #ifdef HAVE_SS7
3119         case SIG_SS7:
3120                 if (!ss7_grab(p, p->ss7)) {
3121                         p->proceeding = 1;
3122                         res = isup_anm(p->ss7->ss7, p->ss7call);
3123                         ss7_rel(p->ss7);
3124                 } else {
3125                         ast_log(LOG_WARNING, "Unable to grab SS7 on span %d\n", p->span);
3126                         res = -1;
3127                 }
3128                 break;
3129 #endif
3130         case 0:
3131                 ast_mutex_unlock(&p->lock);
3132                 return 0;
3133         default:
3134                 ast_log(LOG_WARNING, "Don't know how to answer signalling %d (channel %d)\n", p->sig, p->channel);
3135                 res = -1;
3136         }
3137         ast_mutex_unlock(&p->lock);
3138         return res;
3139 }
3140
3141 static int zt_setoption(struct ast_channel *chan, int option, void *data, int datalen)
3142 {
3143         char *cp;
3144         signed char *scp;
3145         int x;
3146         int index;
3147         struct zt_pvt *p = chan->tech_pvt, *pp;
3148         struct oprmode *oprmode;
3149
3150
3151         /* all supported options require data */
3152         if (!data || (datalen < 1)) {
3153                 errno = EINVAL;
3154                 return -1;
3155         }
3156
3157         switch (option) {
3158         case AST_OPTION_TXGAIN:
3159                 scp = (signed char *) data;
3160                 index = zt_get_index(chan, p, 0);
3161                 if (index < 0) {
3162                         ast_log(LOG_WARNING, "No index in TXGAIN?\n");
3163                         return -1;
3164                 }
3165                 ast_debug(1, "Setting actual tx gain on %s to %f\n", chan->name, p->txgain + (float) *scp);
3166                 return set_actual_txgain(p->subs[index].zfd, 0, p->txgain + (float) *scp, p->law);
3167         case AST_OPTION_RXGAIN:
3168                 scp = (signed char *) data;
3169                 index = zt_get_index(chan, p, 0);
3170                 if (index < 0) {
3171                         ast_log(LOG_WARNING, "No index in RXGAIN?\n");
3172                         return -1;
3173                 }
3174                 ast_debug(1, "Setting actual rx gain on %s to %f\n", chan->name, p->rxgain + (float) *scp);
3175                 return set_actual_rxgain(p->subs[index].zfd, 0, p->rxgain + (float) *scp, p->law);
3176         case AST_OPTION_TONE_VERIFY:
3177                 if (!p->dsp)
3178                         break;
3179                 cp = (char *) data;
3180                 switch (*cp) {
3181                 case 1:
3182                         ast_debug(1, "Set option TONE VERIFY, mode: MUTECONF(1) on %s\n",chan->name);
3183                         ast_dsp_digitmode(p->dsp,DSP_DIGITMODE_MUTECONF | p->dtmfrelax);  /* set mute mode if desired */
3184                         break;
3185                 case 2:
3186                         ast_debug(1, "Set option TONE VERIFY, mode: MUTECONF/MAX(2) on %s\n",chan->name);
3187                         ast_dsp_digitmode(p->dsp,DSP_DIGITMODE_MUTECONF | DSP_DIGITMODE_MUTEMAX | p->dtmfrelax);  /* set mute mode if desired */
3188                         break;
3189                 default:
3190                         ast_debug(1, "Set option TONE VERIFY, mode: OFF(0) on %s\n",chan->name);
3191                         ast_dsp_digitmode(p->dsp,DSP_DIGITMODE_DTMF | p->dtmfrelax);  /* set mute mode if desired */
3192                         break;
3193                 }
3194                 break;
3195         case AST_OPTION_TDD:
3196                 /* turn on or off TDD */
3197                 cp = (char *) data;
3198                 p->mate = 0;
3199                 if (!*cp) { /* turn it off */
3200                         ast_debug(1, "Set option TDD MODE, value: OFF(0) on %s\n",chan->name);
3201                         if (p->tdd)
3202                                 tdd_free(p->tdd);
3203                         p->tdd = 0;
3204                         break;
3205                 }
3206                 ast_debug(1, "Set option TDD MODE, value: %s(%d) on %s\n",
3207                         (*cp == 2) ? "MATE" : "ON", (int) *cp, chan->name);
3208                 zt_disable_ec(p);
3209                 /* otherwise, turn it on */
3210                 if (!p->didtdd) { /* if havent done it yet */
3211                         unsigned char mybuf[41000], *buf;
3212                         int size, res, fd, len;
3213                         struct pollfd fds[1];
3214
3215                         buf = mybuf;
3216                         memset(buf, 0x7f, sizeof(mybuf)); /* set to silence */
3217                         ast_tdd_gen_ecdisa(buf + 16000, 16000);  /* put in tone */
3218                         len = 40000;
3219                         index = zt_get_index(chan, p, 0);
3220                         if (index < 0) {
3221                                 ast_log(LOG_WARNING, "No index in TDD?\n");
3222                                 return -1;
3223                         }
3224                         fd = p->subs[index].zfd;
3225                         while (len) {
3226                                 if (ast_check_hangup(chan))
3227                                         return -1;
3228                                 size = len;
3229                                 if (size > READ_SIZE)
3230                                         size = READ_SIZE;
3231                                 fds[0].fd = fd;
3232                                 fds[0].events = POLLPRI | POLLOUT;
3233                                 fds[0].revents = 0;
3234                                 res = poll(fds, 1, -1);
3235                                 if (!res) {
3236                                         ast_debug(1, "poll (for write) ret. 0 on channel %d\n", p->channel);
3237                                         continue;
3238                                 }
3239                                 /* if got exception */
3240                                 if (fds[0].revents & POLLPRI)
3241                                         return -1;
3242                                 if (!(fds[0].revents & POLLOUT)) {
3243                                         ast_debug(1, "write fd not ready on channel %d\n", p->channel);
3244                                         continue;
3245                                 }
3246                                 res = write(fd, buf, size);
3247                                 if (res != size) {
3248                                         if (res == -1) return -1;
3249                                         ast_debug(1, "Write returned %d (%s) on channel %d\n", res, strerror(errno), p->channel);
3250                                         break;
3251                                 }
3252                                 len -= size;
3253                                 buf += size;
3254                         }
3255                         p->didtdd = 1; /* set to have done it now */
3256                 }
3257                 if (*cp == 2) { /* Mate mode */
3258                         if (p->tdd)
3259                                 tdd_free(p->tdd);
3260                         p->tdd = 0;
3261                         p->mate = 1;
3262                         break;
3263                 }
3264                 if (!p->tdd) { /* if we dont have one yet */
3265                         p->tdd = tdd_new(); /* allocate one */
3266                 }
3267                 break;
3268         case AST_OPTION_RELAXDTMF:  /* Relax DTMF decoding (or not) */
3269                 if (!p->dsp)
3270                         break;
3271                 cp = (char *) data;
3272                 ast_debug(1, "Set option RELAX DTMF, value: %s(%d) on %s\n",
3273                         *cp ? "ON" : "OFF", (int) *cp, chan->name);
3274                 ast_dsp_digitmode(p->dsp, ((*cp) ? DSP_DIGITMODE_RELAXDTMF : DSP_DIGITMODE_DTMF) | p->dtmfrelax);
3275                 break;
3276         case AST_OPTION_AUDIO_MODE:  /* Set AUDIO mode (or not) */
3277                 cp = (char *) data;
3278                 if (!*cp) {
3279                         ast_debug(1, "Set option AUDIO MODE, value: OFF(0) on %s\n", chan->name);
3280                         x = 0;
3281                         zt_disable_ec(p);
3282                 } else {
3283                         ast_debug(1, "Set option AUDIO MODE, value: ON(1) on %s\n", chan->name);
3284                         x = 1;
3285                 }
3286                 if (ioctl(p->subs[SUB_REAL].zfd, ZT_AUDIOMODE, &x) == -1)
3287                         ast_log(LOG_WARNING, "Unable to set audio mode on channel %d to %d\n", p->channel, x);
3288                 break;
3289         case AST_OPTION_OPRMODE:  /* Operator services mode */
3290                 oprmode = (struct oprmode *) data;
3291                 pp = oprmode->peer->tech_pvt;
3292                 p->oprmode = pp->oprmode = 0;
3293                 /* setup peers */
3294                 p->oprpeer = pp;
3295                 pp->oprpeer = p;
3296                 /* setup modes, if any */
3297                 if (oprmode->mode)
3298                 {
3299                         pp->oprmode = oprmode->mode;
3300                         p->oprmode = -oprmode->mode;
3301                 }
3302                 ast_debug(1, "Set Operator Services mode, value: %d on %s/%s\n",
3303                         oprmode->mode, chan->name,oprmode->peer->name);
3304                 break;
3305         case AST_OPTION_ECHOCAN:
3306                 cp = (char *) data;
3307                 if (*cp) {
3308                         ast_debug(1, "Enabling echo cancelation on %s\n", chan->name);
3309                         zt_enable_ec(p);
3310                 } else {
3311                         ast_debug(1, "Disabling echo cancelation on %s\n", chan->name);
3312                         zt_disable_ec(p);
3313                 }
3314                 break;
3315         }
3316         errno = 0;
3317
3318         return 0;
3319 }
3320
3321 static int zt_func_read(struct ast_channel *chan, const char *function, char *data, char *buf, size_t len)
3322 {
3323         struct zt_pvt *p = chan->tech_pvt;
3324
3325         if (!strcasecmp(data, "rxgain")) {
3326                 ast_mutex_lock(&p->lock);
3327                 snprintf(buf, len, "%f", p->rxgain);
3328                 ast_mutex_unlock(&p->lock);
3329         } else if (!strcasecmp(data, "txgain")) {
3330                 ast_mutex_lock(&p->lock);
3331                 snprintf(buf, len, "%f", p->txgain);
3332                 ast_mutex_unlock(&p->lock);
3333         } else {
3334                 ast_copy_string(buf, "", len);
3335         }
3336         return 0;
3337 }
3338
3339
3340 static void zt_unlink(struct zt_pvt *slave, struct zt_pvt *master, int needlock)
3341 {
3342         /* Unlink a specific slave or all slaves/masters from a given master */
3343         int x;
3344         int hasslaves;
3345         if (!master)
3346                 return;
3347         if (needlock) {
3348                 ast_mutex_lock(&master->lock);
3349                 if (slave) {
3350                         while (ast_mutex_trylock(&slave->lock)) {
3351                                 ast_mutex_unlock(&master->lock);
3352                                 usleep(1);
3353                                 ast_mutex_lock(&master->lock);
3354                         }
3355                 }
3356         }
3357         hasslaves = 0;
3358         for (x = 0; x < MAX_SLAVES; x++) {
3359                 if (master->slaves[x]) {
3360                         if (!slave || (master->slaves[x] == slave)) {
3361                                 /* Take slave out of the conference */
3362                                 ast_debug(1, "Unlinking slave %d from %d\n", master->slaves[x]->channel, master->channel);
3363                                 conf_del(master, &master->slaves[x]->subs[SUB_REAL], SUB_REAL);
3364                                 conf_del(master->slaves[x], &master->subs[SUB_REAL], SUB_REAL);
3365                                 master->slaves[x]->master = NULL;
3366                                 master->slaves[x] = NULL;
3367                         } else
3368                                 hasslaves = 1;
3369                 }
3370                 if (!hasslaves)
3371                         master->inconference = 0;
3372         }
3373         if (!slave) {
3374                 if (master->master) {
3375                         /* Take master out of the conference */
3376                         conf_del(master->master, &master->subs[SUB_REAL], SUB_REAL);
3377                         conf_del(master, &master->master->subs[SUB_REAL], SUB_REAL);
3378                         hasslaves = 0;
3379                         for (x = 0; x < MAX_SLAVES; x++) {
3380                                 if (master->master->slaves[x] == master)
3381                                         master->master->slaves[x] = NULL;
3382                                 else if (master->master->slaves[x])
3383                                         hasslaves = 1;
3384                         }
3385                         if (!hasslaves)
3386                                 master->master->inconference = 0;
3387                 }
3388                 master->master = NULL;
3389         }
3390         update_conf(master);
3391         if (needlock) {
3392                 if (slave)
3393                         ast_mutex_unlock(&slave->lock);
3394                 ast_mutex_unlock(&master->lock);
3395         }
3396 }
3397
3398 static void zt_link(struct zt_pvt *slave, struct zt_pvt *master) {
3399         int x;
3400         if (!slave || !master) {
3401                 ast_log(LOG_WARNING, "Tried to link to/from NULL??\n");
3402                 return;
3403         }
3404         for (x = 0; x < MAX_SLAVES; x++) {
3405                 if (!master->slaves[x]) {
3406                         master->slaves[x] = slave;
3407                         break;
3408                 }
3409         }
3410         if (x >= MAX_SLAVES) {
3411                 ast_log(LOG_WARNING, "Replacing slave %d with new slave, %d\n", master->slaves[MAX_SLAVES - 1]->channel, slave->channel);
3412                 master->slaves[MAX_SLAVES - 1] = slave;
3413         }
3414         if (slave->master)
3415                 ast_log(LOG_WARNING, "Replacing master %d with new master, %d\n", slave->master->channel, master->channel);
3416         slave->master = master;
3417
3418         ast_debug(1, "Making %d slave to master %d at %d\n", slave->channel, master->channel, x);
3419 }
3420
3421 static void disable_dtmf_detect(struct zt_pvt *p)
3422 {
3423 #ifdef ZT_TONEDETECT
3424         int val;
3425 #endif
3426
3427         p->ignoredtmf = 1;
3428
3429 #ifdef ZT_TONEDETECT
3430         val = 0;
3431         ioctl(p->subs[SUB_REAL].zfd, ZT_TONEDETECT, &val);
3432 #endif
3433         if (!p->hardwaredtmf && p->dsp) {
3434                 p->dsp_features &= ~DSP_FEATURE_DTMF_DETECT;
3435                 ast_dsp_set_features(p->dsp, p->dsp_features);
3436         }
3437 }
3438
3439 static void enable_dtmf_detect(struct zt_pvt *p)
3440 {
3441 #ifdef ZT_TONEDETECT
3442         int val;
3443 #endif