channels/chan_zap.c

   1 /*
   2  * Asterisk -- A telephony toolkit for Linux.
   3  *
   4  * Zaptel Pseudo TDM interface
   5  *
   6  * Copyright (C) 2003 Digium
   7  *
   8  * Mark Spencer <markster@digium.com>
   9  *
  10  * This program is free software, distributed under the terms of
  11  * the GNU General Public License
  12  */
  13
  14 #include <stdio.h>
  15 #include <string.h>
  16 #include <asterisk/lock.h>
  17 #include <asterisk/channel.h>
  18 #include <asterisk/channel_pvt.h>
  19 #include <asterisk/config.h>
  20 #include <asterisk/logger.h>
  21 #include <asterisk/module.h>
  22 #include <asterisk/pbx.h>
  23 #include <asterisk/options.h>
  24 #include <asterisk/file.h>
  25 #include <asterisk/ulaw.h>
  26 #include <asterisk/alaw.h>
  27 #include <asterisk/callerid.h>
  28 #include <asterisk/adsi.h>
  29 #include <asterisk/cli.h>
  30 #include <asterisk/cdr.h>
  31 #include <asterisk/parking.h>
  32 #include <asterisk/musiconhold.h>
  33 #include <asterisk/say.h>
  34 #include <asterisk/tdd.h>
  35 #include <asterisk/app.h>
  36 #include <asterisk/dsp.h>
  37 #include <asterisk/astdb.h>
  38 #include <asterisk/manager.h>
  39 #include <asterisk/causes.h>
  40 #include <asterisk/term.h>
  41 #include <asterisk/utils.h>
  42 #include <sys/signal.h>
  43 #include <errno.h>
  44 #include <stdlib.h>
  45 #include <stdint.h>
  46 #include <unistd.h>
  47 #include <sys/ioctl.h>
  48 #ifdef __linux__
  49 #include <linux/zaptel.h>
  50 #else
  51 #include <zaptel.h>
  52 #endif /* __linux__ */
  53 #include <math.h>
  54 #include <tonezone.h>
  55 #include <ctype.h>
  56 #ifdef ZAPATA_PRI
  57 #include <libpri.h>
  58 #ifndef PRI_SETUP_CALL
  59 #error "You need newer libpri"
  60 #endif
  61 #endif
  62 #ifdef ZAPATA_R2
  63 #include <libmfcr2.h>
  64 #endif
  65
  66 #include "../asterisk.h"
  67
  68 #ifndef ZT_SIG_EM_E1
  69 #error "Your zaptel is too old.  please cvs update"
  70 #endif
  71
  72 /*
  73  * Define ZHONE_HACK to cause us to go off hook and then back on hook when
  74  * the user hangs up to reset the state machine so ring works properly.
  75  * This is used to be able to support kewlstart by putting the zhone in
  76  * groundstart mode since their forward disconnect supervision is entirely
  77  * broken even though their documentation says it isn't and their support
  78  * is entirely unwilling to provide any assistance with their channel banks
  79  * even though their web site says they support their products for life.
  80  */
  81
  82 /* #define ZHONE_HACK */
  83
  84 /* Typically, how many rings before we should send Caller*ID */
  85 #define DEFAULT_CIDRINGS 1
  86
  87 #define CHANNEL_PSEUDO -12
  88
  89 #define AST_LAW(p) (((p)->law == ZT_LAW_ALAW) ? AST_FORMAT_ALAW : AST_FORMAT_ULAW)
  90
  91 static char *desc = "Zapata Telephony"
  92 #ifdef ZAPATA_PRI
  93                " w/PRI"
  94 #endif
  95 #ifdef ZAPATA_R2
  96                " w/R2"
  97 #endif
  98 ;
  99
 100 static char *tdesc = "Zapata Telephony Driver"
 101 #ifdef ZAPATA_PRI
 102                " w/PRI"
 103 #endif
 104 #ifdef ZAPATA_R2
 105                " w/R2"
 106 #endif
 107 ;
 108
 109 static char *type = "Zap";
 110 static char *typecompat = "Tor";        /* Retain compatibility with chan_tor */
 111 static char *config = "zapata.conf";
 112
 113 #define SIG_EM          ZT_SIG_EM
 114 #define SIG_EMWINK      (0x100000 | ZT_SIG_EM)
 115 #define SIG_FEATD       (0x200000 | ZT_SIG_EM)
 116 #define SIG_FEATDMF     (0x400000 | ZT_SIG_EM)
 117 #define SIG_FEATB       (0x800000 | ZT_SIG_EM)
 118 #define SIG_E911        (0x1000000 | ZT_SIG_EM)
 119 #define SIG_FXSLS       ZT_SIG_FXSLS
 120 #define SIG_FXSGS       ZT_SIG_FXSGS
 121 #define SIG_FXSKS       ZT_SIG_FXSKS
 122 #define SIG_FXOLS       ZT_SIG_FXOLS
 123 #define SIG_FXOGS       ZT_SIG_FXOGS
 124 #define SIG_FXOKS       ZT_SIG_FXOKS
 125 #define SIG_PRI         ZT_SIG_CLEAR
 126 #define SIG_R2          ZT_SIG_CAS
 127 #define SIG_SF          ZT_SIG_SF
 128 #define SIG_SFWINK      (0x100000 | ZT_SIG_SF)
 129 #define SIG_SF_FEATD    (0x200000 | ZT_SIG_SF)
 130 #define SIG_SF_FEATDMF  (0x400000 | ZT_SIG_SF)
 131 #define SIG_SF_FEATB    (0x800000 | ZT_SIG_SF)
 132 #define SIG_EM_E1       ZT_SIG_EM_E1
 133 #define SIG_GR303FXOKS   (0x100000 | ZT_SIG_FXOKS)
 134
 135 #define NUM_SPANS       32
 136 #define NUM_DCHANS      4               /* No more than 4 d-channels */
 137 #define MAX_CHANNELS    672     /* No more than a DS3 per trunk group */
 138 #define RESET_INTERVAL  3600    /* How often (in seconds) to reset unused channels */
 139
 140 #define CHAN_PSEUDO     -2
 141
 142 #define DCHAN_PROVISIONED (1 << 0)
 143 #define DCHAN_NOTINALARM  (1 << 1)
 144 #define DCHAN_UP          (1 << 2)
 145
 146 #define DCHAN_AVAILABLE (DCHAN_PROVISIONED | DCHAN_NOTINALARM | DCHAN_UP)
 147
 148 static char context[AST_MAX_EXTENSION] = "default";
 149 static char callerid[256] = "";
 150
 151 static char language[MAX_LANGUAGE] = "";
 152 static char musicclass[MAX_LANGUAGE] = "";
 153 static char progzone[10]= "";
 154
 155 static int usedistinctiveringdetection = 0;
 156
 157 static int use_callerid = 1;
 158 static int zaptrcallerid = 0;
 159 static int cur_signalling = -1;
 160
 161 static unsigned int cur_group = 0;
 162 static unsigned int cur_callergroup = 0;
 163 static unsigned int cur_pickupgroup = 0;
 164 static int relaxdtmf = 0;
 165
 166 static int immediate = 0;
 167
 168 static int stripmsd = 0;
 169
 170 static int callwaiting = 0;
 171
 172 static int callwaitingcallerid = 0;
 173
 174 static int hidecallerid = 0;
 175
 176 static int restrictcid = 0;
 177
 178 static int use_callingpres = 0;
 179
 180 static int callreturn = 0;
 181
 182 static int threewaycalling = 0;
 183
 184 static int transfer = 0;
 185
 186 static int cancallforward = 0;
 187
 188 static float rxgain = 0.0;
 189
 190 static float txgain = 0.0;
 191
 192 static int tonezone = -1;
 193
 194 static int echocancel;
 195
 196 static int echotraining;
 197
 198 static int echocanbridged = 0;
 199
 200 static int busydetect = 0;
 201
 202 static int busycount = 3;
 203
 204 static int callprogress = 0;
 205
 206 static char accountcode[20] = "";
 207
 208 static char mailbox[AST_MAX_EXTENSION];
 209
 210 static int amaflags = 0;
 211
 212 static int adsi = 0;
 213
 214 static int numbufs = 4;
 215
 216 static int cur_prewink = -1;
 217 static int cur_preflash = -1;
 218 static int cur_wink = -1;
 219 static int cur_flash = -1;
 220 static int cur_start = -1;
 221 static int cur_rxwink = -1;
 222 static int cur_rxflash = -1;
 223 static int cur_debounce = -1;
 224
 225 #ifdef ZAPATA_PRI
 226 static int minunused = 2;
 227 static int minidle = 0;
 228 static char idleext[AST_MAX_EXTENSION];
 229 static char idledial[AST_MAX_EXTENSION];
 230 static int overlapdial = 0;
 231 static struct ast_channel inuse = { "GR-303InUse" };
 232 #endif
 233
 234 /* Wait up to 16 seconds for first digit (FXO logic) */
 235 static int firstdigittimeout = 16000;
 236
 237 /* How long to wait for following digits (FXO logic) */
 238 static int gendigittimeout = 8000;
 239
 240 /* How long to wait for an extra digit, if there is an ambiguous match */
 241 static int matchdigittimeout = 3000;
 242
 243 static int usecnt =0;
 244 AST_MUTEX_DEFINE_STATIC(usecnt_lock);
 245
 246 /* Protect the interface list (of zt_pvt's) */
 247 AST_MUTEX_DEFINE_STATIC(iflock);
 248
 249 static int ifcount = 0;
 250
 251 /* Protect the monitoring thread, so only one process can kill or start it, and not
 252    when it's doing something critical. */
 253 AST_MUTEX_DEFINE_STATIC(monlock);
 254
 255 /* This is the thread for the monitor which checks for input on the channels
 256    which are not currently in use.  */
 257 static pthread_t monitor_thread = AST_PTHREADT_NULL;
 258
 259 static int restart_monitor(void);
 260
 261 static int zt_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags, struct ast_frame **fo, struct ast_channel **rc);
 262
 263 static int zt_sendtext(struct ast_channel *c, char *text);
 264
 265 static inline int zt_get_event(int fd)
 266 {
 267         /* Avoid the silly zt_getevent which ignores a bunch of events */
 268         int j;
 269         if (ioctl(fd, ZT_GETEVENT, &j) == -1) return -1;
 270         return j;
 271 }
 272
 273 static inline int zt_wait_event(int fd)
 274 {
 275         /* Avoid the silly zt_waitevent which ignores a bunch of events */
 276         int i,j=0;
 277         i = ZT_IOMUX_SIGEVENT;
 278         if (ioctl(fd, ZT_IOMUX, &i) == -1) return -1;
 279         if (ioctl(fd, ZT_GETEVENT, &j) == -1) return -1;
 280         return j;
 281 }
 282
 283 /* Chunk size to read -- we use 20ms chunks to make things happy.  */
 284 #define READ_SIZE 160
 285
 286 #define MASK_AVAIL              (1 << 0)                /* Channel available for PRI use */
 287 #define MASK_INUSE              (1 << 1)                /* Channel currently in use */
 288
 289 #define CALLWAITING_SILENT_SAMPLES      ( (300 * 8) / READ_SIZE) /* 300 ms */
 290 #define CALLWAITING_REPEAT_SAMPLES      ( (10000 * 8) / READ_SIZE) /* 300 ms */
 291 #define CIDCW_EXPIRE_SAMPLES            ( (500 * 8) / READ_SIZE) /* 500 ms */
 292 #define MIN_MS_SINCE_FLASH                      ( (2000) )      /* 2000 ms */
 293 #define RINGT                                           ( (8000 * 8) / READ_SIZE)
 294
 295 struct zt_pvt;
 296
 297
 298 #ifdef ZAPATA_R2
 299 static int r2prot = -1;
 300 #endif
 301
 302
 303 #ifdef ZAPATA_PRI
 304
 305 #define PVT_TO_CHANNEL(p) (((p)->prioffset) | ((p)->logicalspan << 8))
 306 #define PRI_CHANNEL(p) ((p) & 0xff)
 307 #define PRI_SPAN(p) (((p) >> 8) & 0xff)
 308
 309 struct zt_pri {
 310         pthread_t master;                       /* Thread of master */
 311         ast_mutex_t lock;               /* Mutex */
 312         char idleext[AST_MAX_EXTENSION];                /* Where to idle extra calls */
 313         char idlecontext[AST_MAX_EXTENSION];            /* What context to use for idle */
 314         char idledial[AST_MAX_EXTENSION];               /* What to dial before dumping */
 315         int minunused;                          /* Min # of channels to keep empty */
 316         int minidle;                            /* Min # of "idling" calls to keep active */
 317         int nodetype;                           /* Node type */
 318         int switchtype;                         /* Type of switch to emulate */
 319         int dialplan;                   /* Dialing plan */
 320         int dchannels[NUM_DCHANS];      /* What channel are the dchannels on */
 321         int trunkgroup;                 /* What our trunkgroup is */
 322         int mastertrunkgroup;   /* What trunk group is our master */
 323         int prilogicalspan;             /* Logical span number within trunk group */
 324         int numchans;                   /* Num of channels we represent */
 325         int overlapdial;                /* In overlap dialing mode */
 326         struct pri *dchans[NUM_DCHANS]; /* Actual d-channels */
 327         int dchanavail[NUM_DCHANS];             /* Whether each channel is available */
 328         struct pri *pri;                                /* Currently active D-channel */
 329         int debug;
 330         int fds[NUM_DCHANS];    /* FD's for d-channels */
 331         int offset;
 332         int span;
 333         int resetting;
 334         int resetpos;
 335         time_t lastreset;
 336         struct zt_pvt *pvts[MAX_CHANNELS];      /* Member channel pvt structs */
 337         struct zt_pvt *crvs;                            /* Member CRV structs */
 338         struct zt_pvt *crvend;                          /* Pointer to end of CRV structs */
 339 };
 340
 341
 342 static struct zt_pri pris[NUM_SPANS];
 343
 344 static int pritype = PRI_CPE;
 345
 346 #if 0
 347 #define DEFAULT_PRI_DEBUG (PRI_DEBUG_Q931_DUMP | PRI_DEBUG_Q921_DUMP | PRI_DEBUG_Q921_RAW | PRI_DEBUG_Q921_STATE)
 348 #else
 349 #define DEFAULT_PRI_DEBUG 0
 350 #endif
 351
 352 static inline void pri_rel(struct zt_pri *pri)
 353 {
 354         ast_mutex_unlock(&pri->lock);
 355 }
 356
 357 static int switchtype = PRI_SWITCH_NI2;
 358 static int dialplan = PRI_NATIONAL_ISDN + 1;
 359
 360 #else
 361 /* Shut up the compiler */
 362 struct zt_pri;
 363 #endif
 364
 365 #define SUB_REAL                0                       /* Active call */
 366 #define SUB_CALLWAIT    1                       /* Call-Waiting call on hold */
 367 #define SUB_THREEWAY    2                       /* Three-way call */
 368
 369
 370 static struct zt_distRings drings;
 371
 372 struct distRingData {
 373         int ring[3];
 374 };
 375 struct ringContextData {
 376         char contextData[AST_MAX_EXTENSION];
 377 };
 378 struct zt_distRings {
 379         struct distRingData ringnum[3];
 380         struct ringContextData ringContext[3];
 381 };
 382
 383 static char *subnames[] = {
 384         "Real",
 385         "Callwait",
 386         "Threeway"
 387 };
 388
 389 struct zt_subchannel {
 390         int zfd;
 391         struct ast_channel *owner;
 392         int chan;
 393         short buffer[AST_FRIENDLY_OFFSET/2 + READ_SIZE];
 394         struct ast_frame f;             /* One frame for each channel.  How did this ever work before? */
 395         int needringing;
 396         int needbusy;
 397         int needcongestion;
 398         int needcallerid;
 399         int needanswer;
 400         int linear;
 401         int inthreeway;
 402         ZT_CONFINFO curconf;
 403 };
 404
 405 #define CONF_USER_REAL          (1 << 0)
 406 #define CONF_USER_THIRDCALL     (1 << 1)
 407
 408 #define MAX_SLAVES      4
 409
 410 static struct zt_pvt {
 411         ast_mutex_t lock;
 412         struct ast_channel *owner;      /* Our current active owner (if applicable) */
 413                 /* Up to three channels can be associated with this call */
 414
 415         struct zt_subchannel sub_unused;        /* Just a safety precaution */
 416         struct zt_subchannel subs[3];   /* Sub-channels */
 417         struct zt_confinfo saveconf;    /* Saved conference info */
 418
 419         struct zt_pvt *slaves[MAX_SLAVES];      /* Slave to us (follows our conferencing) */
 420         struct zt_pvt *master;  /* Master to us (we follow their conferencing) */
 421         int inconference;               /* If our real should be in the conference */
 422
 423         int sig;                                        /* Signalling style */
 424         int radio;                              /* radio type */
 425         int firstradio;                         /* first radio flag */
 426         float rxgain;
 427         float txgain;
 428         int tonezone;                           /* tone zone for this chan, or -1 for default */
 429         struct zt_pvt *next;                    /* Next channel in list */
 430         struct zt_pvt *prev;                    /* Prev channel in list */
 431
 432         struct zt_distRings drings;
 433         int usedistinctiveringdetection;
 434
 435         char context[AST_MAX_EXTENSION];
 436         char defcontext[AST_MAX_EXTENSION];
 437         char exten[AST_MAX_EXTENSION];
 438         char language[MAX_LANGUAGE];
 439         char musicclass[MAX_LANGUAGE];
 440         char callerid[AST_MAX_EXTENSION];
 441         char lastcallerid[AST_MAX_EXTENSION];
 442         char *origcallerid;                     /* malloced original callerid */
 443         char callwaitcid[AST_MAX_EXTENSION];
 444         char rdnis[AST_MAX_EXTENSION];
 445         char dnid[AST_MAX_EXTENSION];
 446         unsigned int group;
 447         int law;
 448         int confno;                                     /* Our conference */
 449         int confusers;                          /* Who is using our conference */
 450         int propconfno;                         /* Propagated conference number */
 451         unsigned int callgroup;
 452         unsigned int pickupgroup;
 453         int immediate;                          /* Answer before getting digits? */
 454         int channel;                            /* Channel Number or CRV */
 455         int span;                                       /* Span number */
 456         int dialing;
 457         time_t guardtime;                       /* Must wait this much time before using for new call */
 458         int dialednone;
 459         int use_callerid;                       /* Whether or not to use caller id on this channel */
 460         int hidecallerid;
 461         int callreturn;
 462         int permhidecallerid;           /* Whether to hide our outgoing caller ID or not */
 463         int restrictcid;                /* Whether restrict the callerid -> only send ANI */
 464         int use_callingpres;            /* Whether to use the callingpres the calling switch sends */
 465         int callingpres;                /* The value of callling presentation that we're going to use when placing a PRI call */
 466         int callwaitingrepeat;          /* How many samples to wait before repeating call waiting */
 467         int cidcwexpire;                        /* When to expire our muting for CID/CW */
 468         unsigned char *cidspill;
 469         int cidpos;
 470         int cidlen;
 471         int ringt;
 472         int stripmsd;
 473         int callwaiting;
 474         int callwaitcas;
 475         int callwaitrings;
 476         int echocancel;
 477         int echotraining;
 478         int echocanbridged;
 479         int echocanon;
 480         int echobreak;
 481         char echorest[10];
 482         int permcallwaiting;
 483         int callwaitingcallerid;
 484         int threewaycalling;
 485         int transfer;
 486         int digital;
 487         int outgoing;
 488         int dnd;
 489         int busydetect;
 490         int busycount;
 491         int callprogress;
 492         struct timeval flashtime;       /* Last flash-hook time */
 493         struct ast_dsp *dsp;
 494         int cref;                                       /* Call reference number */
 495         ZT_DIAL_OPERATION dop;
 496         int destroy;
 497         int ignoredtmf;
 498         int inalarm;
 499         char accountcode[20];           /* Account code */
 500         int amaflags;                           /* AMA Flags */
 501         char didtdd;                    /* flag to say its done it once */
 502         struct tdd_state *tdd;          /* TDD flag */
 503         int adsi;
 504         int cancallforward;
 505         char call_forward[AST_MAX_EXTENSION];
 506         char mailbox[AST_MAX_EXTENSION];
 507         char dialdest[256];
 508         int onhooktime;
 509         int msgstate;
 510
 511         int confirmanswer;              /* Wait for '#' to confirm answer */
 512         int distinctivering;    /* Which distinctivering to use */
 513         int cidrings;                   /* Which ring to deliver CID on */
 514
 515         int faxhandled;                 /* Has a fax tone already been handled? */
 516
 517         char mate;                      /* flag to say its in MATE mode */
 518         int pulsedial;          /* whether a pulse dial phone is detected */
 519         int dtmfrelax;          /* whether to run in relaxed DTMF mode */
 520         int fake_event;
 521         int zaptrcallerid;      /* should we use the callerid from incoming call on zap transfer or not */
 522 #ifdef ZAPATA_PRI
 523         struct zt_pri *pri;
 524         struct zt_pvt *bearer;
 525         struct zt_pvt *realcall;
 526         q931_call *call;
 527         int isidlecall;
 528         int resetting;
 529         int prioffset;
 530         int logicalspan;
 531         int alreadyhungup;
 532         int proceeding;
 533         int setup_ack;          /* wheter we received SETUP_ACKNOWLEDGE or not */
 534 #endif
 535 #ifdef ZAPATA_R2
 536         int r2prot;
 537         mfcr2_t *r2;
 538         int hasr2call;
 539         int r2blocked;
 540         int sigchecked;
 541 #endif
 542 } *iflist = NULL, *ifend = NULL;
 543
 544 struct zt_pvt *round_robin[32];
 545
 546 #ifdef ZAPATA_PRI
 547 static inline int pri_grab(struct zt_pvt *pvt, struct zt_pri *pri)
 548 {
 549         int res;
 550         /* Grab the lock first */
 551         do {
 552             res = ast_mutex_trylock(&pri->lock);
 553                 if (res) {
 554                         ast_mutex_unlock(&pvt->lock);
 555                         /* Release the lock and try again */
 556                         usleep(1);
 557                         ast_mutex_lock(&pvt->lock);
 558                 }
 559         } while(res);
 560         /* Then break the poll */
 561         pthread_kill(pri->master, SIGURG);
 562         return 0;
 563 }
 564 #endif
 565
 566 #define NUM_CADENCE_MAX 25
 567 static int num_cadence = 4;
 568 static int user_has_defined_cadences = 0;
 569
 570 static struct zt_ring_cadence cadences[NUM_CADENCE_MAX] = {
 571         { { 125, 125, 2000, 4000 } },                   /* Quick chirp followed by normal ring */
 572         { { 250, 250, 500, 1000, 250, 250, 500, 4000 } }, /* British style ring */
 573         { { 125, 125, 125, 125, 125, 4000 } },  /* Three short bursts */
 574         { { 1000, 500, 2500, 5000 } },  /* Long ring */
 575 };
 576
 577 int receivedRingT; /* Used to find out what ringtone we are on */
 578
 579 /* cidrings says in which pause to transmit the cid information, where the first pause
 580  * is 1, the second pause is 2 and so on.
 581  */
 582
 583 static int cidrings[NUM_CADENCE_MAX] = {
 584         2,                                                                              /* Right after first long ring */
 585         4,                                                                              /* Right after long part */
 586         3,                                                                              /* After third chirp */
 587         2,                                                                              /* Second spell */
 588 };
 589
 590 #define ISTRUNK(p) ((p->sig == SIG_FXSLS) || (p->sig == SIG_FXSKS) || \
 591                         (p->sig == SIG_FXSGS) || (p->sig == SIG_PRI))
 592
 593 #define CANBUSYDETECT(p) (ISTRUNK(p) || (p->sig & (SIG_EM | SIG_EM_E1 | SIG_SF)) /* || (p->sig & __ZT_SIG_FXO) */)
 594 #define CANPROGRESSDETECT(p) (ISTRUNK(p) || (p->sig & (SIG_EM | SIG_EM_E1 | SIG_SF)) /* || (p->sig & __ZT_SIG_FXO) */)
 595
 596 #ifdef ZAPATA_PRI
 597 /* translate between PRI causes and asterisk's */
 598 static int hangup_pri2cause(int cause)
 599 {
 600         switch(cause) {
 601                 case PRI_CAUSE_USER_BUSY:
 602                         return AST_CAUSE_BUSY;
 603                 case PRI_CAUSE_NORMAL_CLEARING:
 604                         return AST_CAUSE_NORMAL;
 605                 case PRI_CAUSE_NORMAL_CIRCUIT_CONGESTION:
 606                 case PRI_CAUSE_REQUESTED_CHAN_UNAVAIL:
 607                         return AST_CAUSE_CONGESTION;
 608                 case PRI_CAUSE_UNALLOCATED:
 609                 case PRI_CAUSE_NUMBER_CHANGED:
 610                         return AST_CAUSE_UNALLOCATED;
 611                 default:
 612                         return AST_CAUSE_FAILURE;
 613         }
 614         /* never reached */
 615         return 0;
 616 }
 617
 618 /* translate between ast cause and PRI */
 619 static int hangup_cause2pri(int cause)
 620 {
 621         switch(cause) {
 622                 case AST_CAUSE_BUSY:
 623                         return PRI_CAUSE_USER_BUSY;
 624                 case AST_CAUSE_UNALLOCATED:
 625                         return PRI_CAUSE_UNALLOCATED;
 626                 case AST_CAUSE_CONGESTION:
 627                         return PRI_CAUSE_NORMAL_CIRCUIT_CONGESTION;
 628                 case AST_CAUSE_NORMAL:
 629                 default:
 630                         return PRI_CAUSE_NORMAL_CLEARING;
 631         }
 632         /* never reached */
 633         return 0;
 634 }
 635 #endif
 636
 637 static int zt_get_index(struct ast_channel *ast, struct zt_pvt *p, int nullok)
 638 {
 639         int res;
 640         if (p->subs[0].owner == ast)
 641                 res = 0;
 642         else if (p->subs[1].owner == ast)
 643                 res = 1;
 644         else if (p->subs[2].owner == ast)
 645                 res = 2;
 646         else {
 647                 res = -1;
 648                 if (!nullok)
 649                         ast_log(LOG_WARNING, "Unable to get index, and nullok is not asserted\n");
 650         }
 651         return res;
 652 }
 653
 654 static void wakeup_sub(struct zt_pvt *p, int a)
 655 {
 656         struct ast_frame null = { AST_FRAME_NULL, };
 657         for (;;) {
 658                 if (p->subs[a].owner) {
 659                         if (ast_mutex_trylock(&p->subs[a].owner->lock)) {
 660                                 ast_mutex_unlock(&p->lock);
 661                                 usleep(1);
 662                                 ast_mutex_lock(&p->lock);
 663                         } else {
 664                                 ast_queue_frame(p->subs[a].owner, &null);
 665                                 ast_mutex_unlock(&p->subs[a].owner->lock);
 666                                 break;
 667                         }
 668                 } else
 669                         break;
 670         }
 671 }
 672
 673 static void zap_queue_frame(struct zt_pvt *p, struct ast_frame *f)
 674 {
 675         for (;;) {
 676                 if (p->owner) {
 677                         if (ast_mutex_trylock(&p->owner->lock)) {
 678                                 ast_mutex_unlock(&p->lock);
 679                                 usleep(1);
 680                                 ast_mutex_lock(&p->lock);
 681                         } else {
 682                                 ast_queue_frame(p->owner, f);
 683                                 ast_mutex_unlock(&p->owner->lock);
 684                                 break;
 685                         }
 686                 } else
 687                         break;
 688         }
 689 }
 690
 691 static void swap_subs(struct zt_pvt *p, int a, int b)
 692 {
 693         int tchan;
 694         int tinthreeway;
 695         struct ast_channel *towner;
 696
 697         ast_log(LOG_DEBUG, "Swapping %d and %d\n", a, b);
 698
 699         tchan = p->subs[a].chan;
 700         towner = p->subs[a].owner;
 701         tinthreeway = p->subs[a].inthreeway;
 702
 703         p->subs[a].chan = p->subs[b].chan;
 704         p->subs[a].owner = p->subs[b].owner;
 705         p->subs[a].inthreeway = p->subs[b].inthreeway;
 706
 707         p->subs[b].chan = tchan;
 708         p->subs[b].owner = towner;
 709         p->subs[b].inthreeway = tinthreeway;
 710
 711         if (p->subs[a].owner)
 712                 p->subs[a].owner->fds[0] = p->subs[a].zfd;
 713         if (p->subs[b].owner)
 714                 p->subs[b].owner->fds[0] = p->subs[b].zfd;
 715         wakeup_sub(p, a);
 716         wakeup_sub(p, b);
 717 }
 718
 719 static int zt_open(char *fn)
 720 {
 721         int fd;
 722         int isnum;
 723         int chan = 0;
 724         int bs;
 725         int x;
 726         isnum = 1;
 727         for (x=0;x<strlen(fn);x++) {
 728                 if (!isdigit(fn[x])) {
 729                         isnum = 0;
 730                         break;
 731                 }
 732         }
 733         if (isnum) {
 734                 chan = atoi(fn);
 735                 if (chan < 1) {
 736                         ast_log(LOG_WARNING, "Invalid channel number '%s'\n", fn);
 737                         return -1;
 738                 }
 739                 fn = "/dev/zap/channel";
 740         }
 741         fd = open(fn, O_RDWR | O_NONBLOCK);
 742         if (fd < 0) {
 743                 ast_log(LOG_WARNING, "Unable to open '%s': %s\n", fn, strerror(errno));
 744                 return -1;
 745         }
 746         if (chan) {
 747                 if (ioctl(fd, ZT_SPECIFY, &chan)) {
 748                         x = errno;
 749                         close(fd);
 750                         errno = x;
 751                         ast_log(LOG_WARNING, "Unable to specify channel %d: %s\n", chan, strerror(errno));
 752                         return -1;
 753                 }
 754         }
 755         bs = READ_SIZE;
 756         if (ioctl(fd, ZT_SET_BLOCKSIZE, &bs) == -1) return -1;
 757         return fd;
 758 }
 759
 760 static void zt_close(int fd)
 761 {
 762         close(fd);
 763 }
 764
 765 int zt_setlinear(int zfd, int linear)
 766 {
 767         int res;
 768         res = ioctl(zfd, ZT_SETLINEAR, &linear);
 769         if (res)
 770                 return res;
 771         return 0;
 772 }
 773
 774
 775 int zt_setlaw(int zfd, int law)
 776 {
 777         int res;
 778         res = ioctl(zfd, ZT_SETLAW, &law);
 779         if (res)
 780                 return res;
 781         return 0;
 782 }
 783
 784 static int alloc_sub(struct zt_pvt *p, int x)
 785 {
 786         ZT_BUFFERINFO bi;
 787         int res;
 788         if (p->subs[x].zfd < 0) {
 789                 p->subs[x].zfd = zt_open("/dev/zap/pseudo");
 790                 if (p->subs[x].zfd > -1) {
 791                         res = ioctl(p->subs[x].zfd, ZT_GET_BUFINFO, &bi);
 792                         if (!res) {
 793                                 bi.txbufpolicy = ZT_POLICY_IMMEDIATE;
 794                                 bi.rxbufpolicy = ZT_POLICY_IMMEDIATE;
 795                                 bi.numbufs = numbufs;
 796                                 res = ioctl(p->subs[x].zfd, ZT_SET_BUFINFO, &bi);
 797                                 if (res < 0) {
 798                                         ast_log(LOG_WARNING, "Unable to set buffer policy on channel %d\n", x);
 799                                 }
 800                         } else
 801                                 ast_log(LOG_WARNING, "Unable to check buffer policy on channel %d\n", x);
 802                         if (ioctl(p->subs[x].zfd, ZT_CHANNO, &p->subs[x].chan) == 1) {
 803                                 ast_log(LOG_WARNING,"Unable to get channel number for pseudo channel on FD %d\n",p->subs[x].zfd);
 804                                 zt_close(p->subs[x].zfd);
 805                                 p->subs[x].zfd = -1;
 806                                 return -1;
 807                         }
 808                         if (option_debug)
 809                                 ast_log(LOG_DEBUG, "Allocated %s subchannel on FD %d channel %d\n", subnames[x], p->subs[x].zfd, p->subs[x].chan);
 810                         return 0;
 811                 } else
 812                         ast_log(LOG_WARNING, "Unable to open pseudo channel: %s\n", strerror(errno));
 813                 return -1;
 814         }
 815         ast_log(LOG_WARNING, "%s subchannel of %d already in use\n", subnames[x], p->channel);
 816         return -1;
 817 }
 818
 819 static int unalloc_sub(struct zt_pvt *p, int x)
 820 {
 821         if (!x) {
 822                 ast_log(LOG_WARNING, "Trying to unalloc the real channel %d?!?\n", p->channel);
 823                 return -1;
 824         }
 825         ast_log(LOG_DEBUG, "Released sub %d of channel %d\n", x, p->channel);
 826         if (p->subs[x].zfd > -1) {
 827                 zt_close(p->subs[x].zfd);
 828         }
 829         p->subs[x].zfd = -1;
 830         p->subs[x].linear = 0;
 831         p->subs[x].chan = 0;
 832         p->subs[x].owner = NULL;
 833         p->subs[x].inthreeway = 0;
 834         memset(&p->subs[x].curconf, 0, sizeof(p->subs[x].curconf));
 835         return 0;
 836 }
 837
 838 static int zt_digit(struct ast_channel *ast, char digit)
 839 {
 840         ZT_DIAL_OPERATION zo;
 841         struct zt_pvt *p;
 842         int res = 0;
 843         int index;
 844         p = ast->pvt->pvt;
 845         ast_mutex_lock(&p->lock);
 846         index = zt_get_index(ast, p, 0);
 847         if (index == SUB_REAL) {
 848 #ifdef ZAPATA_PRI
 849                 if (p->sig == SIG_PRI && ast->_state == AST_STATE_DIALING && (p->proceeding < 2)) {
 850                         if (p->setup_ack) {
 851                                 if (!pri_grab(p, p->pri)) {
 852                                         pri_information(p->pri->pri,p->call,digit);
 853                                         pri_rel(p->pri);
 854                                 } else
 855                                         ast_log(LOG_WARNING, "Unable to grab PRI on span %d\n", p->span);
 856                         } else if (strlen(p->dialdest) < sizeof(p->dialdest) - 1) {
 857                                 ast_log(LOG_DEBUG, "Queueing digit '%c' since setup_ack not yet received\n", digit);
 858                                 res = strlen(p->dialdest);
 859                                 p->dialdest[res++] = digit;
 860                                 p->dialdest[res] = '\0';
 861                         }
 862                 } else {
 863 #else
 864                 {
 865 #endif
 866                         zo.op = ZT_DIAL_OP_APPEND;
 867                         zo.dialstr[0] = 'T';
 868                         zo.dialstr[1] = digit;
 869                         zo.dialstr[2] = 0;
 870                         if ((res = ioctl(p->subs[SUB_REAL].zfd, ZT_DIAL, &zo)))
 871                                 ast_log(LOG_WARNING, "Couldn't dial digit %c\n", digit);
 872                         else
 873                                 p->dialing = 1;
 874                 }
 875         }
 876         ast_mutex_unlock(&p->lock);
 877         return res;
 878 }
 879
 880 static char *events[] = {
 881         "No event",
 882         "On hook",
 883         "Ring/Answered",
 884         "Wink/Flash",
 885         "Alarm",
 886         "No more alarm",
 887                 "HDLC Abort",
 888                 "HDLC Overrun",
 889                 "HDLC Bad FCS",
 890                 "Dial Complete",
 891                 "Ringer On",
 892                 "Ringer Off",
 893                 "Hook Transition Complete",
 894                 "Bits Changed",
 895                 "Pulse Start"
 896 };
 897
 898 static struct {
 899         int alarm;
 900         char *name;
 901 } alarms[] = {
 902         { ZT_ALARM_RED, "Red Alarm" },
 903         { ZT_ALARM_YELLOW, "Yellow Alarm" },
 904         { ZT_ALARM_BLUE, "Blue Alarm" },
 905         { ZT_ALARM_RECOVER, "Recovering" },
 906         { ZT_ALARM_LOOPBACK, "Loopback" },
 907         { ZT_ALARM_NOTOPEN, "Not Open" },
 908         { ZT_ALARM_NONE, "None" },
 909 };
 910
 911 static char *alarm2str(int alarm)
 912 {
 913         int x;
 914         for (x=0;x<sizeof(alarms) / sizeof(alarms[0]); x++) {
 915                 if (alarms[x].alarm & alarm)
 916                         return alarms[x].name;
 917         }
 918         return alarm ? "Unknown Alarm" : "No Alarm";
 919 }
 920
 921 static char *event2str(int event)
 922 {
 923         static char buf[256];
 924         if ((event < 15) && (event > -1))
 925                 return events[event];
 926         sprintf(buf, "Event %d", event);
 927         return buf;
 928 }
 929
 930 #ifdef ZAPATA_R2
 931 static int str2r2prot(char *swtype)
 932 {
 933     if (!strcasecmp(swtype, "ar"))
 934         return MFCR2_PROT_ARGENTINA;
 935     /*endif*/
 936     if (!strcasecmp(swtype, "cn"))
 937         return MFCR2_PROT_CHINA;
 938     /*endif*/
 939     if (!strcasecmp(swtype, "kr"))
 940         return MFCR2_PROT_KOREA;
 941     /*endif*/
 942     return -1;
 943 }
 944 #endif
 945
 946 static char *sig2str(int sig)
 947 {
 948         static char buf[256];
 949         switch(sig) {
 950         case SIG_EM:
 951                 return "E & M Immediate";
 952         case SIG_EMWINK:
 953                 return "E & M Wink";
 954         case SIG_EM_E1:
 955                 return "E & M E1";
 956         case SIG_FEATD:
 957                 return "Feature Group D (DTMF)";
 958         case SIG_FEATDMF:
 959                 return "Feature Group D (MF)";
 960         case SIG_FEATB:
 961                 return "Feature Group B (MF)";
 962         case SIG_E911:
 963                 return "E911 (MF)";
 964         case SIG_FXSLS:
 965                 return "FXS Loopstart";
 966         case SIG_FXSGS:
 967                 return "FXS Groundstart";
 968         case SIG_FXSKS:
 969                 return "FXS Kewlstart";
 970         case SIG_FXOLS:
 971                 return "FXO Loopstart";
 972         case SIG_FXOGS:
 973                 return "FXO Groundstart";
 974         case SIG_FXOKS:
 975                 return "FXO Kewlstart";
 976         case SIG_PRI:
 977                 return "PRI Signalling";
 978         case SIG_R2:
 979                 return "R2 Signalling";
 980         case SIG_SF:
 981                 return "SF (Tone) Signalling Immediate";
 982         case SIG_SFWINK:
 983                 return "SF (Tone) Signalling Wink";
 984         case SIG_SF_FEATD:
 985                 return "SF (Tone) Signalling with Feature Group D (DTMF)";
 986         case SIG_SF_FEATDMF:
 987                 return "SF (Tone) Signalling with Feature Group D (MF)";
 988         case SIG_SF_FEATB:
 989                 return "SF (Tone) Signalling with Feature Group B (MF)";
 990         case SIG_GR303FXOKS:
 991                 return "GR-303 Signalling with FXOKS";
 992         case 0:
 993                 return "Pseudo Signalling";
 994         default:
 995                 snprintf(buf, sizeof(buf), "Unknown signalling %d", sig);
 996                 return buf;
 997         }
 998 }
 999
1000 static int conf_add(struct zt_pvt *p, struct zt_subchannel *c, int index, int slavechannel)
1001 {
1002         /* If the conference already exists, and we're already in it
1003            don't bother doing anything */
1004         ZT_CONFINFO zi;
1005
1006         memset(&zi, 0, sizeof(zi));
1007         zi.chan = 0;
1008
1009         if (slavechannel > 0) {
1010                 /* If we have only one slave, do a digital mon */
1011                 zi.confmode = ZT_CONF_DIGITALMON;
1012                 zi.confno = slavechannel;
1013         } else {
1014                 if (!index) {
1015                         /* Real-side and pseudo-side both participate in conference */
1016                         zi.confmode = ZT_CONF_REALANDPSEUDO | ZT_CONF_TALKER | ZT_CONF_LISTENER |
1017                                                                 ZT_CONF_PSEUDO_TALKER | ZT_CONF_PSEUDO_LISTENER;
1018                 } else
1019                         zi.confmode = ZT_CONF_CONF | ZT_CONF_TALKER | ZT_CONF_LISTENER;
1020                 zi.confno = p->confno;
1021         }
1022         if ((zi.confno == c->curconf.confno) && (zi.confmode == c->curconf.confmode))
1023                 return 0;
1024         if (c->zfd < 0)
1025                 return 0;
1026         if (ioctl(c->zfd, ZT_SETCONF, &zi)) {
1027                 ast_log(LOG_WARNING, "Failed to add %d to conference %d/%d\n", c->zfd, zi.confmode, zi.confno);
1028                 return -1;
1029         }
1030         if (slavechannel < 1) {
1031                 p->confno = zi.confno;
1032         }
1033         memcpy(&c->curconf, &zi, sizeof(c->curconf));
1034         ast_log(LOG_DEBUG, "Added %d to conference %d/%d\n", c->zfd, c->curconf.confmode, c->curconf.confno);
1035         return 0;
1036 }
1037
1038 static int isourconf(struct zt_pvt *p, struct zt_subchannel *c)
1039 {
1040         /* If they're listening to our channel, they're ours */
1041         if ((p->channel == c->curconf.confno) && (c->curconf.confmode == ZT_CONF_DIGITALMON))
1042                 return 1;
1043         /* If they're a talker on our (allocated) conference, they're ours */
1044         if ((p->confno > 0) && (p->confno == c->curconf.confno) && (c->curconf.confmode & ZT_CONF_TALKER))
1045                 return 1;
1046         return 0;
1047 }
1048
1049 static int conf_del(struct zt_pvt *p, struct zt_subchannel *c, int index)
1050 {
1051         ZT_CONFINFO zi;
1052         if (/* Can't delete if there's no zfd */
1053                 (c->zfd < 0) ||
1054                 /* Don't delete from the conference if it's not our conference */
1055                 !isourconf(p, c)
1056                 /* Don't delete if we don't think it's conferenced at all (implied) */
1057                 ) return 0;
1058         memset(&zi, 0, sizeof(zi));
1059         zi.chan = 0;
1060         zi.confno = 0;
1061         zi.confmode = 0;
1062         if (ioctl(c->zfd, ZT_SETCONF, &zi)) {
1063                 ast_log(LOG_WARNING, "Failed to drop %d from conference %d/%d\n", c->zfd, c->curconf.confmode, c->curconf.confno);
1064                 return -1;
1065         }
1066         ast_log(LOG_DEBUG, "Removed %d from conference %d/%d\n", c->zfd, c->curconf.confmode, c->curconf.confno);
1067         memcpy(&c->curconf, &zi, sizeof(c->curconf));
1068         return 0;
1069 }
1070
1071 static int isslavenative(struct zt_pvt *p, struct zt_pvt **out)
1072 {
1073         int x;
1074         int useslavenative;
1075         struct zt_pvt *slave = NULL;
1076         /* Start out optimistic */
1077         useslavenative = 1;
1078         /* Update conference state in a stateless fashion */
1079         for (x=0;x<3;x++) {
1080                 /* Any three-way calling makes slave native mode *definitely* out
1081                    of the question */
1082                 if ((p->subs[x].zfd > -1) && p->subs[x].inthreeway)
1083                         useslavenative = 0;
1084         }
1085         /* If we don't have any 3-way calls, check to see if we have
1086            precisely one slave */
1087         if (useslavenative) {
1088                 for (x=0;x<MAX_SLAVES;x++) {
1089                         if (p->slaves[x]) {
1090                                 if (slave) {
1091                                         /* Whoops already have a slave!  No
1092                                            slave native and stop right away */
1093                                         slave = NULL;
1094                                         useslavenative = 0;
1095                                         break;
1096                                 } else {
1097                                         /* We have one slave so far */
1098                                         slave = p->slaves[x];
1099                                 }
1100                         }
1101                 }
1102         }
1103         /* If no slave, slave native definitely out */
1104         if (!slave)
1105                 useslavenative = 0;
1106         else if (slave->law != p->law) {
1107                 useslavenative = 0;
1108                 slave = NULL;
1109         }
1110         if (out)
1111                 *out = slave;
1112         return useslavenative;
1113 }
1114
1115 static int update_conf(struct zt_pvt *p)
1116 {
1117         int needconf = 0;
1118         int x;
1119         int useslavenative;
1120         struct zt_pvt *slave = NULL;
1121
1122         useslavenative = isslavenative(p, &slave);
1123         /* Start with the obvious, general stuff */
1124         for (x=0;x<3;x++) {
1125                 /* Look for three way calls */
1126                 if ((p->subs[x].zfd > -1) && p->subs[x].inthreeway) {
1127                         conf_add(p, &p->subs[x], x, 0);
1128                         needconf++;
1129                 } else {
1130                         conf_del(p, &p->subs[x], x);
1131                 }
1132         }
1133         /* If we have a slave, add him to our conference now. or DAX
1134            if this is slave native */
1135         for (x=0;x<MAX_SLAVES;x++) {
1136                 if (p->slaves[x]) {
1137                         if (useslavenative)
1138                                 conf_add(p, &p->slaves[x]->subs[SUB_REAL], SUB_REAL, p->channel);
1139                         else {
1140                                 conf_add(p, &p->slaves[x]->subs[SUB_REAL], SUB_REAL, 0);
1141                                 needconf++;
1142                         }
1143                 }
1144         }
1145         /* If we're supposed to be in there, do so now */
1146         if (p->inconference && !p->subs[SUB_REAL].inthreeway) {
1147                 if (useslavenative)
1148                         conf_add(p, &p->subs[SUB_REAL], SUB_REAL, slave->channel);
1149                 else {
1150                         conf_add(p, &p->subs[SUB_REAL], SUB_REAL, 0);
1151                         needconf++;
1152                 }
1153         }
1154         /* If we have a master, add ourselves to his conference */
1155         if (p->master) {
1156                 if (isslavenative(p->master, NULL)) {
1157                         conf_add(p->master, &p->subs[SUB_REAL], SUB_REAL, p->master->channel);
1158                 } else {
1159                         conf_add(p->master, &p->subs[SUB_REAL], SUB_REAL, 0);
1160                 }
1161         }
1162         if (!needconf) {
1163                 /* Nobody is left (or should be left) in our conference.
1164                    Kill it.  */
1165                 p->confno = -1;
1166         }
1167         ast_log(LOG_DEBUG, "Updated conferencing on %d, with %d conference users\n", p->channel, needconf);
1168         return 0;
1169 }
1170
1171 static void zt_enable_ec(struct zt_pvt *p)
1172 {
1173         int x;
1174         int res;
1175         if (p->echocanon) {
1176                 ast_log(LOG_DEBUG, "Echo cancellation already on\n");
1177                 return;
1178         }
1179         if (p && p->echocancel) {
1180                 if (p->sig == SIG_PRI) {
1181                         x = 1;
1182                         res = ioctl(p->subs[SUB_REAL].zfd, ZT_AUDIOMODE, &x);
1183                         if (res)
1184                                 ast_log(LOG_WARNING, "Unable to enable echo cancellation on channel %d\n", p->channel);
1185                 }
1186                 x = p->echocancel;
1187                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_ECHOCANCEL, &x);
1188                 if (res)
1189                         ast_log(LOG_WARNING, "Unable to enable echo cancellation on channel %d\n", p->channel);
1190                 else {
1191                         p->echocanon = 1;
1192                         ast_log(LOG_DEBUG, "Enabled echo cancellation on channel %d\n", p->channel);
1193                 }
1194         } else
1195                 ast_log(LOG_DEBUG, "No echocancellation requested\n");
1196 }
1197
1198 static void zt_train_ec(struct zt_pvt *p)
1199 {
1200         int x;
1201         int res;
1202         if (p && p->echocancel && p->echotraining) {
1203                 x = 400;
1204                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_ECHOTRAIN, &x);
1205                 if (res)
1206                         ast_log(LOG_WARNING, "Unable to request echo training on channel %d\n", p->channel);
1207                 else {
1208                         ast_log(LOG_DEBUG, "Engaged echo training on channel %d\n", p->channel);
1209                 }
1210         } else
1211                 ast_log(LOG_DEBUG, "No echo training requested\n");
1212 }
1213
1214 static void zt_disable_ec(struct zt_pvt *p)
1215 {
1216         int x;
1217         int res;
1218         if (p->echocancel) {
1219                 x = 0;
1220                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_ECHOCANCEL, &x);
1221                 if (res)
1222                         ast_log(LOG_WARNING, "Unable to disable echo cancellation on channel %d\n", p->channel);
1223                 else
1224                         ast_log(LOG_DEBUG, "disabled echo cancellation on channel %d\n", p->channel);
1225         }
1226         p->echocanon = 0;
1227 }
1228
1229 int set_actual_gain(int fd, int chan, float rxgain, float txgain, int law)
1230 {
1231         struct  zt_gains g;
1232         float ltxgain;
1233         float lrxgain;
1234         int j,k;
1235         g.chan = chan;
1236         if ((rxgain != 0.0)  || (txgain != 0.0)) {
1237                 /* caluculate linear value of tx gain */
1238                 ltxgain = pow(10.0,txgain / 20.0);
1239                 /* caluculate linear value of rx gain */
1240                 lrxgain = pow(10.0,rxgain / 20.0);
1241                 if (law == ZT_LAW_ALAW) {
1242                         for (j=0;j<256;j++) {
1243                                 k = (int)(((float)AST_ALAW(j)) * lrxgain);
1244                                 if (k > 32767) k = 32767;
1245                                 if (k < -32767) k = -32767;
1246                                 g.rxgain[j] = AST_LIN2A(k);
1247                                 k = (int)(((float)AST_ALAW(j)) * ltxgain);
1248                                 if (k > 32767) k = 32767;
1249                                 if (k < -32767) k = -32767;
1250                                 g.txgain[j] = AST_LIN2A(k);
1251                         }
1252                 } else {
1253                         for (j=0;j<256;j++) {
1254                                 k = (int)(((float)AST_MULAW(j)) * lrxgain);
1255                                 if (k > 32767) k = 32767;
1256                                 if (k < -32767) k = -32767;
1257                                 g.rxgain[j] = AST_LIN2MU(k);
1258                                 k = (int)(((float)AST_MULAW(j)) * ltxgain);
1259                                 if (k > 32767) k = 32767;
1260                                 if (k < -32767) k = -32767;
1261                                 g.txgain[j] = AST_LIN2MU(k);
1262                         }
1263                 }
1264         } else {
1265                 for (j=0;j<256;j++) {
1266                         g.rxgain[j] = j;
1267                         g.txgain[j] = j;
1268                 }
1269         }
1270
1271           /* set 'em */
1272         return(ioctl(fd,ZT_SETGAINS,&g));
1273 }
1274
1275 static inline int zt_set_hook(int fd, int hs)
1276 {
1277         int x, res;
1278         x = hs;
1279         res = ioctl(fd, ZT_HOOK, &x);
1280         if (res < 0)
1281         {
1282                 if (errno == EINPROGRESS) return 0;
1283                 ast_log(LOG_WARNING, "zt hook failed: %s\n", strerror(errno));
1284         }
1285         return res;
1286 }
1287
1288 static inline int zt_confmute(struct zt_pvt *p, int muted)
1289 {
1290         int x, y, res;
1291         x = muted;
1292         if (p->sig == SIG_PRI) {
1293                 y = 1;
1294                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_AUDIOMODE, &y);
1295                 if (res)
1296                         ast_log(LOG_WARNING, "Unable to set audio mode on '%d'\n", p->channel);
1297         }
1298         res = ioctl(p->subs[SUB_REAL].zfd, ZT_CONFMUTE, &x);
1299         if (res < 0)
1300                 ast_log(LOG_WARNING, "zt confmute(%d) failed on channel %d: %s\n", muted, p->channel, strerror(errno));
1301         return res;
1302 }
1303
1304 static int save_conference(struct zt_pvt *p)
1305 {
1306         struct zt_confinfo c;
1307         int res;
1308         if (p->saveconf.confmode) {
1309                 ast_log(LOG_WARNING, "Can't save conference -- already in use\n");
1310                 return -1;
1311         }
1312         p->saveconf.chan = 0;
1313         res = ioctl(p->subs[SUB_REAL].zfd, ZT_GETCONF, &p->saveconf);
1314         if (res) {
1315                 ast_log(LOG_WARNING, "Unable to get conference info: %s\n", strerror(errno));
1316                 p->saveconf.confmode = 0;
1317                 return -1;
1318         }
1319         c.chan = 0;
1320         c.confno = 0;
1321         c.confmode = ZT_CONF_NORMAL;
1322         res = ioctl(p->subs[SUB_REAL].zfd, ZT_SETCONF, &c);
1323         if (res) {
1324                 ast_log(LOG_WARNING, "Unable to set conference info: %s\n", strerror(errno));
1325                 return -1;
1326         }
1327         if (option_debug)
1328                 ast_log(LOG_DEBUG, "Disabled conferencing\n");
1329         return 0;
1330 }
1331
1332 static int restore_conference(struct zt_pvt *p)
1333 {
1334         int res;
1335         if (p->saveconf.confmode) {
1336                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_SETCONF, &p->saveconf);
1337                 p->saveconf.confmode = 0;
1338                 if (res) {
1339                         ast_log(LOG_WARNING, "Unable to restore conference info: %s\n", strerror(errno));
1340                         return -1;
1341                 }
1342         }
1343         if (option_debug)
1344                 ast_log(LOG_DEBUG, "Restored conferencing\n");
1345         return 0;
1346 }
1347
1348 static int send_callerid(struct zt_pvt *p);
1349
1350 int send_cwcidspill(struct zt_pvt *p)
1351 {
1352         p->callwaitcas = 0;
1353         p->cidcwexpire = 0;
1354         p->cidspill = malloc(MAX_CALLERID_SIZE);
1355         if (p->cidspill) {
1356                 memset(p->cidspill, 0x7f, MAX_CALLERID_SIZE);
1357                 p->cidlen = ast_callerid_callwaiting_generate(p->cidspill, p->callwaitcid, AST_LAW(p));
1358                 /* Make sure we account for the end */
1359                 p->cidlen += READ_SIZE * 4;
1360                 p->cidpos = 0;
1361                 send_callerid(p);
1362                 if (option_verbose > 2)
1363                         ast_verbose(VERBOSE_PREFIX_3 "CPE supports Call Waiting Caller*ID.  Sending '%s'\n", p->callwaitcid);
1364         } else return -1;
1365         return 0;
1366 }
1367
1368 static int has_voicemail(struct zt_pvt *p)
1369 {
1370
1371         return ast_app_has_voicemail(p->mailbox);
1372 }
1373
1374 static int send_callerid(struct zt_pvt *p)
1375 {
1376         /* Assumes spill in p->cidspill, p->cidlen in length and we're p->cidpos into it */
1377         int res;
1378         /* Take out of linear mode if necessary */
1379         if (p->subs[SUB_REAL].linear) {
1380                 p->subs[SUB_REAL].linear = 0;
1381                 zt_setlinear(p->subs[SUB_REAL].zfd, 0);
1382         }
1383         while(p->cidpos < p->cidlen) {
1384                 res = write(p->subs[SUB_REAL].zfd, p->cidspill + p->cidpos, p->cidlen - p->cidpos);
1385                 if (res < 0) {
1386                         if (errno == EAGAIN)
1387                                 return 0;
1388                         else {
1389                                 ast_log(LOG_WARNING, "write failed: %s\n", strerror(errno));
1390                                 return -1;
1391                         }
1392                 }
1393                 if (!res)
1394                         return 0;
1395                 p->cidpos += res;
1396         }
1397         free(p->cidspill);
1398         p->cidspill = NULL;
1399         if (p->callwaitcas) {
1400                 /* Wait for CID/CW to expire */
1401                 p->cidcwexpire = CIDCW_EXPIRE_SAMPLES;
1402         } else
1403                 restore_conference(p);
1404         return 0;
1405 }
1406
1407 static int zt_callwait(struct ast_channel *ast)
1408 {
1409         struct zt_pvt *p = ast->pvt->pvt;
1410         p->callwaitingrepeat = CALLWAITING_REPEAT_SAMPLES;
1411         if (p->cidspill) {
1412                 ast_log(LOG_WARNING, "Spill already exists?!?\n");
1413                 free(p->cidspill);
1414         }
1415         p->cidspill = malloc(2400 /* SAS */ + 680 /* CAS */ + READ_SIZE * 4);
1416         if (p->cidspill) {
1417                 save_conference(p);
1418                 /* Silence */
1419                 memset(p->cidspill, 0x7f, 2400 + 600 + READ_SIZE * 4);
1420                 if (!p->callwaitrings && p->callwaitingcallerid) {
1421                         ast_gen_cas(p->cidspill, 1, 2400 + 680, AST_LAW(p));
1422                         p->callwaitcas = 1;
1423                         p->cidlen = 2400 + 680 + READ_SIZE * 4;
1424                 } else {
1425                         ast_gen_cas(p->cidspill, 1, 2400, AST_LAW(p));
1426                         p->callwaitcas = 0;
1427                         p->cidlen = 2400 + READ_SIZE * 4;
1428                 }
1429                 p->cidpos = 0;
1430                 send_callerid(p);
1431         } else {
1432                 ast_log(LOG_WARNING, "Unable to create SAS/CAS spill\n");
1433                 return -1;
1434         }
1435         return 0;
1436 }
1437
1438 static int zt_call(struct ast_channel *ast, char *rdest, int timeout)
1439 {
1440         struct zt_pvt *p = ast->pvt->pvt;
1441         int x, res, index;
1442         char *c, *n, *l;
1443 #ifdef ZAPATA_PRI
1444         char *s;
1445 #endif
1446         char callerid[256];
1447         char dest[256]; /* must be same length as p->dialdest */
1448         ast_mutex_lock(&p->lock);
1449         strncpy(dest, rdest, sizeof(dest) - 1);
1450         strncpy(p->dialdest, rdest, sizeof(dest) - 1);
1451         if ((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) {
1452                 ast_log(LOG_WARNING, "zt_call called on %s, neither down nor reserved\n", ast->name);
1453                 ast_mutex_unlock(&p->lock);
1454                 return -1;
1455         }
1456         p->dialednone = 0;
1457         if (p->radio)  /* if a radio channel, up immediately */
1458         {
1459                 /* Special pseudo -- automatically up */
1460                 ast_setstate(ast, AST_STATE_UP);
1461                 ast_mutex_unlock(&p->lock);
1462                 return 0;
1463         }
1464         x = ZT_FLUSH_READ | ZT_FLUSH_WRITE;
1465         res = ioctl(p->subs[SUB_REAL].zfd, ZT_FLUSH, &x);
1466         if (res)
1467                 ast_log(LOG_WARNING, "Unable to flush input on channel %d\n", p->channel);
1468         p->outgoing = 1;
1469
1470         set_actual_gain(p->subs[SUB_REAL].zfd, 0, p->rxgain, p->txgain, p->law);
1471
1472         switch(p->sig) {
1473         case SIG_FXOLS:
1474         case SIG_FXOGS:
1475         case SIG_FXOKS:
1476                 if (p->owner == ast) {
1477                         /* Normal ring, on hook */
1478
1479                         /* Don't send audio while on hook, until the call is answered */
1480                         p->dialing = 1;
1481                         if (p->use_callerid) {
1482                                 /* Generate the Caller-ID spill if desired */
1483                                 if (p->cidspill) {
1484                                         ast_log(LOG_WARNING, "cidspill already exists??\n");
1485                                         free(p->cidspill);
1486                                 }
1487                                 p->cidspill = malloc(MAX_CALLERID_SIZE);
1488                                 p->callwaitcas = 0;
1489                                 if (p->cidspill) {
1490                                         p->cidlen = ast_callerid_generate(p->cidspill, ast->callerid, AST_LAW(p));
1491                                         p->cidpos = 0;
1492                                         send_callerid(p);
1493                                 } else
1494                                         ast_log(LOG_WARNING, "Unable to generate CallerID spill\n");
1495                         }
1496                         /* Choose proper cadence */
1497                         if ((p->distinctivering > 0) && (p->distinctivering <= num_cadence)) {
1498                                 if (ioctl(p->subs[SUB_REAL].zfd, ZT_SETCADENCE, &cadences[p->distinctivering-1]))
1499                                         ast_log(LOG_WARNING, "Unable to set distinctive ring cadence %d on '%s'\n", p->distinctivering, ast->name);
1500                                 p->cidrings = cidrings[p->distinctivering - 1];
1501                         } else {
1502                                 if (ioctl(p->subs[SUB_REAL].zfd, ZT_SETCADENCE, NULL))
1503                                         ast_log(LOG_WARNING, "Unable to reset default ring on '%s'\n", ast->name);
1504                                 p->cidrings = DEFAULT_CIDRINGS;
1505                         }
1506
1507
1508                         /* nick@dccinc.com 4/3/03 mods to allow for deferred dialing */
1509                         c = strchr(dest, '/');
1510                         if (c)
1511                                 c++;
1512                         if (c && (strlen(c) < p->stripmsd)) {
1513                                 ast_log(LOG_WARNING, "Number '%s' is shorter than stripmsd (%d)\n", c, p->stripmsd);
1514                                 c = NULL;
1515                         }
1516                         if (c) {
1517                                 p->dop.op = ZT_DIAL_OP_REPLACE;
1518                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "Tw%s", c);
1519                                 ast_log(LOG_DEBUG, "FXO: setup deferred dialstring: %s\n", c);
1520                         } else {
1521                                 strcpy(p->dop.dialstr, "");
1522                         }
1523                         x = ZT_RING;
1524                         if (ioctl(p->subs[SUB_REAL].zfd, ZT_HOOK, &x) && (errno != EINPROGRESS)) {
1525                                 ast_log(LOG_WARNING, "Unable to ring phone: %s\n", strerror(errno));
1526                                 ast_mutex_unlock(&p->lock);
1527                                 return -1;
1528                         }
1529                         p->dialing = 1;
1530                 } else {
1531                         /* Call waiting call */
1532                         p->callwaitrings = 0;
1533                         if (ast->callerid)
1534                                 strncpy(p->callwaitcid, ast->callerid, sizeof(p->callwaitcid)-1);
1535                         else
1536                                 strcpy(p->callwaitcid, "");
1537                         /* Call waiting tone instead */
1538                         if (zt_callwait(ast)) {
1539                                 ast_mutex_unlock(&p->lock);
1540                                 return -1;
1541                         }
1542                         /* Make ring-back */
1543                         if (tone_zone_play_tone(p->subs[SUB_CALLWAIT].zfd, ZT_TONE_RINGTONE))
1544                                 ast_log(LOG_WARNING, "Unable to generate call-wait ring-back on channel %s\n", ast->name);
1545
1546                 }
1547                 if (ast->callerid)
1548                         strncpy(callerid, ast->callerid, sizeof(callerid)-1);
1549                 else
1550                         strcpy(callerid, "");
1551                 ast_callerid_parse(callerid, &n, &l);
1552                 if (l) {
1553                         ast_shrink_phone_number(l);
1554                         if (!ast_isphonenumber(l))
1555                                 l = NULL;
1556                 }
1557                 if (l)
1558                         strcpy(p->lastcallerid, l);
1559                 else
1560                         strcpy(p->lastcallerid, "");
1561                 ast_setstate(ast, AST_STATE_RINGING);
1562                 index = zt_get_index(ast, p, 0);
1563                 if (index > -1) {
1564                         p->subs[index].needringing = 1;
1565                 }
1566                 break;
1567         case SIG_FXSLS:
1568         case SIG_FXSGS:
1569         case SIG_FXSKS:
1570         case SIG_EMWINK:
1571         case SIG_EM:
1572         case SIG_EM_E1:
1573         case SIG_FEATD:
1574         case SIG_FEATDMF:
1575         case SIG_E911:
1576         case SIG_FEATB:
1577         case SIG_SFWINK:
1578         case SIG_SF:
1579         case SIG_SF_FEATD:
1580         case SIG_SF_FEATDMF:
1581         case SIG_SF_FEATB:
1582                 c = strchr(dest, '/');
1583                 if (c)
1584                         c++;
1585                 else
1586                         c = "";
1587                 if (strlen(c) < p->stripmsd) {
1588                         ast_log(LOG_WARNING, "Number '%s' is shorter than stripmsd (%d)\n", c, p->stripmsd);
1589                         ast_mutex_unlock(&p->lock);
1590                         return -1;
1591                 }
1592                 x = ZT_START;
1593                 /* Start the trunk */
1594                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_HOOK, &x);
1595                 if (res < 0) {
1596                         if (errno != EINPROGRESS) {
1597                                 ast_log(LOG_WARNING, "Unable to start channel: %s\n", strerror(errno));
1598                                 ast_mutex_unlock(&p->lock);
1599                                 return -1;
1600                         }
1601                 }
1602                 ast_log(LOG_DEBUG, "Dialing '%s'\n", c);
1603                 p->dop.op = ZT_DIAL_OP_REPLACE;
1604                 if (p->sig == SIG_FEATD) {
1605                         if (ast->callerid) {
1606                                 strncpy(callerid, ast->callerid, sizeof(callerid)-1);
1607                                 ast_callerid_parse(callerid, &n, &l);
1608                                 if (l) {
1609                                         ast_shrink_phone_number(l);
1610                                         if (!ast_isphonenumber(l))
1611                                                 l = NULL;
1612                                 }
1613                         } else
1614                                 l = NULL;
1615                         if (l)
1616                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "T*%s*%s*", l, c + p->stripmsd);
1617                         else
1618                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "T**%s*", c + p->stripmsd);
1619                 } else
1620                 if (p->sig == SIG_FEATDMF) {
1621                         if (ast->callerid) {
1622                                 strncpy(callerid, ast->callerid, sizeof(callerid)-1);
1623                                 ast_callerid_parse(callerid, &n, &l);
1624                                 if (l) {
1625                                         ast_shrink_phone_number(l);
1626                                         if (!ast_isphonenumber(l))
1627                                                 l = NULL;
1628                                 }
1629                         } else
1630                                 l = NULL;
1631                         if (l)
1632                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "M*00%s#*%s#", l, c + p->stripmsd);
1633                         else
1634                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "M*02#*%s#", c + p->stripmsd);
1635                 } else
1636                 if (p->sig == SIG_E911) {
1637                         strcpy(p->dop.dialstr,"M*911#");
1638                 } else
1639                 if (p->sig == SIG_FEATB) {
1640                         snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "M*%s#", c + p->stripmsd);
1641                 } else
1642                         snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "T%sw", c + p->stripmsd);
1643                 if (strlen(p->dop.dialstr) > 4) {
1644                         strcpy(p->echorest, "w");
1645                         strcpy(p->echorest + 1, p->dop.dialstr + strlen(p->dop.dialstr) - 2);
1646                         p->echobreak = 1;
1647                         p->dop.dialstr[strlen(p->dop.dialstr)-2] = '\0';
1648                 } else
1649                         p->echobreak = 0;
1650                 if (!res) {
1651                         if (ioctl(p->subs[SUB_REAL].zfd, ZT_DIAL, &p->dop)) {
1652                                 x = ZT_ONHOOK;
1653                                 ioctl(p->subs[SUB_REAL].zfd, ZT_HOOK, &x);
1654                                 ast_log(LOG_WARNING, "Dialing failed on channel %d: %s\n", p->channel, strerror(errno));
1655                                 ast_mutex_unlock(&p->lock);
1656                                 return -1;
1657                         }
1658                 } else
1659                         ast_log(LOG_DEBUG, "Deferring dialing...\n");
1660                 p->dialing = 1;
1661                 if (strlen(c + p->stripmsd) < 1) p->dialednone = 1;
1662                 ast_setstate(ast, AST_STATE_DIALING);
1663                 break;
1664         case 0:
1665                 /* Special pseudo -- automatically up*/
1666                 ast_setstate(ast, AST_STATE_UP);
1667                 break;
1668         case SIG_PRI:
1669                 /* We'll get it in a moment -- but use dialdest to store pre-setup_ack digits */
1670                 strcpy(p->dialdest, "");
1671                 break;
1672         default:
1673                 ast_log(LOG_DEBUG, "not yet implemented\n");
1674                 ast_mutex_unlock(&p->lock);
1675                 return -1;
1676         }
1677 #ifdef ZAPATA_PRI
1678         if (p->pri) {
1679                 struct pri_sr *sr;
1680                 c = strchr(dest, '/');
1681                 if (c)
1682                         c++;
1683                 else
1684                         c = dest;
1685                 if (ast->callerid && !p->hidecallerid) {
1686                         strncpy(callerid, ast->callerid, sizeof(callerid)-1);
1687                         ast_callerid_parse(callerid, &n, &l);
1688                         if (l) {
1689                                 ast_shrink_phone_number(l);
1690                                 if (!ast_isphonenumber(l))
1691                                         l = NULL;
1692                         }
1693                 } else
1694                         l = NULL;
1695                 if (strlen(c) < p->stripmsd) {
1696                         ast_log(LOG_WARNING, "Number '%s' is shorter than stripmsd (%d)\n", c, p->stripmsd);
1697                         ast_mutex_unlock(&p->lock);
1698                         return -1;
1699                 }
1700                 p->dop.op = ZT_DIAL_OP_REPLACE;
1701                 s = strchr(c + p->stripmsd, 'w');
1702                 if (s) {
1703                         if (strlen(s))
1704                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "T%s", s);
1705                         else
1706                                 strcpy(p->dop.dialstr, "");
1707                         *s = '\0';
1708                 } else {
1709                         strcpy(p->dop.dialstr, "");
1710                 }
1711                 if (pri_grab(p, p->pri)) {
1712                         ast_log(LOG_WARNING, "Failed to grab PRI!\n");
1713                         ast_mutex_unlock(&p->lock);
1714                         return -1;
1715                 }
1716                 if (!(p->call = pri_new_call(p->pri->pri))) {
1717                         ast_log(LOG_WARNING, "Unable to create call on channel %d\n", p->channel);
1718                         pri_rel(p->pri);
1719                         ast_mutex_unlock(&p->lock);
1720                         return -1;
1721                 }
1722                 if (!(sr = pri_sr_new())) {
1723                         ast_log(LOG_WARNING, "Failed to allocate setup request channel %d\n", p->channel);
1724                         pri_rel(p->pri);
1725                         ast_mutex_unlock(&p->lock);
1726                 }
1727                 if (p->bearer) {
1728                         ast_log(LOG_DEBUG, "Oooh, I have a bearer on %d (%d:%d)\n", PVT_TO_CHANNEL(p->bearer), p->bearer->logicalspan, p->bearer->channel);
1729                         pri_set_crv(p->pri->pri, p->call, p->channel, 0);
1730                         p->bearer->call = p->call;
1731                 }
1732                 p->digital = ast_test_flag(ast,AST_FLAG_DIGITAL);
1733                 pri_sr_set_channel(sr, p->bearer ? PVT_TO_CHANNEL(p->bearer) : PVT_TO_CHANNEL(p),
1734                                                                 p->pri->nodetype == PRI_NETWORK ? 0 : 1, 1);
1735                 pri_sr_set_bearer(sr, p->digital ? PRI_TRANS_CAP_DIGITAL : PRI_TRANS_CAP_SPEECH,
1736                                         (p->digital ? -1 :
1737                                                 ((p->law == ZT_LAW_ALAW) ? PRI_LAYER_1_ALAW : PRI_LAYER_1_ULAW)));
1738                 pri_sr_set_called(sr, c + p->stripmsd, p->pri->dialplan - 1,  s ? 1 : 0);
1739                 pri_sr_set_caller(sr, l, n, p->pri->dialplan - 1,
1740                                         l ? (ast->restrictcid ? PRES_PROHIB_USER_NUMBER_PASSED_SCREEN :
1741                                                 (p->use_callingpres ? ast->callingpres : PRES_ALLOWED_USER_NUMBER_PASSED_SCREEN)) :
1742                                                  PRES_NUMBER_NOT_AVAILABLE);
1743                 if (pri_setup(p->pri->pri, p->call,  sr)) {
1744                         ast_log(LOG_WARNING, "Unable to setup call to %s\n", c + p->stripmsd);
1745                         pri_rel(p->pri);
1746                         ast_mutex_unlock(&p->lock);
1747                         pri_sr_free(sr);
1748                         return -1;
1749                 }
1750                 pri_sr_free(sr);
1751                 ast_setstate(ast, AST_STATE_DIALING);
1752                 pri_rel(p->pri);
1753         }
1754 #endif
1755         ast_mutex_unlock(&p->lock);
1756         return 0;
1757 }
1758
1759 static int destroy_channel(struct zt_pvt *prev, struct zt_pvt *cur, int now)
1760 {
1761         int owned = 0;
1762         int i = 0;
1763
1764         if (!now) {
1765                 if (cur->owner) {
1766                         owned = 1;
1767                 }
1768
1769                 for (i = 0; i < 3; i++) {
1770                         if (cur->subs[i].owner) {
1771                                 owned = 1;
1772                         }
1773                 }
1774                 if (!owned) {
1775                         if (prev) {
1776                                 prev->next = cur->next;
1777                                 if (prev->next)
1778                                         prev->next->prev = prev;
1779                                 else
1780                                         ifend = prev;
1781                         } else {
1782                                 iflist = cur->next;
1783                                 if (iflist)
1784                                         iflist->prev = NULL;
1785                                 else
1786                                         ifend = NULL;
1787                         }
1788                         if (cur->subs[SUB_REAL].zfd > -1) {
1789                                 zt_close(cur->subs[SUB_REAL].zfd);
1790                         }
1791                         free(cur);
1792                 }
1793         } else {
1794                 if (prev) {
1795                         prev->next = cur->next;
1796                         if (prev->next)
1797                                 prev->next->prev = prev;
1798                         else
1799                                 ifend = prev;
1800                 } else {
1801                         iflist = cur->next;
1802                         if (iflist)
1803                                 iflist->prev = NULL;
1804                         else
1805                                 ifend = NULL;
1806                 }
1807                 if (cur->subs[SUB_REAL].zfd > -1) {
1808                         zt_close(cur->subs[SUB_REAL].zfd);
1809                 }
1810                 free(cur);
1811         }
1812         return 0;
1813 }
1814
1815 #ifdef ZAPATA_PRI
1816 int pri_is_up(struct zt_pri *pri)
1817 {
1818         int x;
1819         for (x=0;x<NUM_DCHANS;x++) {
1820                 if (pri->dchanavail[x] == DCHAN_AVAILABLE)
1821                         return 1;
1822         }
1823         return 0;
1824 }
1825
1826 int pri_assign_bearer(struct zt_pvt *crv, struct zt_pri *pri, struct zt_pvt *bearer)
1827 {
1828         bearer->owner = &inuse;
1829         bearer->master = crv;
1830         crv->subs[SUB_REAL].zfd = bearer->subs[SUB_REAL].zfd;
1831         crv->bearer = bearer;
1832         crv->call = bearer->call;
1833         crv->pri = pri;
1834         return 0;
1835 }
1836
1837 static char *pri_order(int level)
1838 {
1839         switch(level) {
1840         case 0:
1841                 return "Primary";
1842         case 1:
1843                 return "Secondary";
1844         case 2:
1845                 return "Tertiary";
1846         case 3:
1847                 return "Quaternary";
1848         default:
1849                 return "<Unknown>";
1850         }
1851 }
1852
1853 int pri_find_dchan(struct zt_pri *pri)
1854 {
1855         int oldslot = -1;
1856         struct pri *old;
1857         int newslot = -1;
1858         int x;
1859         old = pri->pri;
1860         for(x=0;x<NUM_DCHANS;x++) {
1861                 if ((pri->dchanavail[x] == DCHAN_AVAILABLE) && (newslot < 0))
1862                         newslot = x;
1863                 if (pri->dchans[x] == old) {
1864                         oldslot = x;
1865                 }
1866         }
1867         if (newslot < 0) {
1868                 newslot = 0;
1869                 ast_log(LOG_WARNING, "No D-channels available!  Using Primary on channel anyway %d!\n",
1870                         pri->dchannels[newslot]);
1871         }
1872         if (old && (oldslot != newslot))
1873                 ast_log(LOG_NOTICE, "Switching from from d-channel %d to channel %d!\n",
1874                         pri->dchannels[oldslot], pri->dchannels[newslot]);
1875         pri->pri = pri->dchans[newslot];
1876         return 0;
1877 }
1878 #endif
1879
1880 static int zt_hangup(struct ast_channel *ast)
1881 {
1882         int res;
1883         int index,x, law;
1884         static int restore_gains(struct zt_pvt *p);
1885         struct zt_pvt *p = ast->pvt->pvt;
1886         struct zt_pvt *tmp = NULL;
1887         struct zt_pvt *prev = NULL;
1888         ZT_PARAMS par;
1889
1890         if (option_debug)
1891                 ast_log(LOG_DEBUG, "zt_hangup(%s)\n", ast->name);
1892         if (!ast->pvt->pvt) {
1893                 ast_log(LOG_WARNING, "Asked to hangup channel not connected\n");
1894                 return 0;
1895         }
1896
1897         ast_mutex_lock(&p->lock);
1898
1899         index = zt_get_index(ast, p, 1);
1900
1901         if (p->sig == SIG_PRI) {
1902                 x = 1;
1903                 ast_channel_setoption(ast,AST_OPTION_AUDIO_MODE,&x,sizeof(char),0);
1904         }
1905
1906         x = 0;
1907         zt_confmute(p, 0);
1908         restore_gains(p);
1909         if (p->origcallerid) {
1910                 strncpy(p->callerid, p->origcallerid, sizeof(p->callerid) - 1);
1911                 free(p->origcallerid);
1912                 p->origcallerid = NULL;
1913         }
1914         if (p->dsp)
1915                 ast_dsp_digitmode(p->dsp,DSP_DIGITMODE_DTMF | p->dtmfrelax);
1916         if (p->exten)
1917                 strcpy(p->exten, "");
1918
1919         ast_log(LOG_DEBUG, "Hangup: channel: %d index = %d, normal = %d, callwait = %d, thirdcall = %d\n",
1920                 p->channel, index, p->subs[SUB_REAL].zfd, p->subs[SUB_CALLWAIT].zfd, p->subs[SUB_THREEWAY].zfd);
1921         p->ignoredtmf = 0;
1922
1923         if (index > -1) {
1924                 /* Real channel, do some fixup */
1925                 p->subs[index].owner = NULL;
1926                 p->subs[index].needanswer = 0;
1927                 p->subs[index].needringing = 0;
1928                 p->subs[index].needbusy = 0;
1929                 p->subs[index].needcongestion = 0;
1930                 p->subs[index].linear = 0;
1931                 p->subs[index].needcallerid = 0;
1932                 zt_setlinear(p->subs[index].zfd, 0);
1933                 if (index == SUB_REAL) {
1934                         if ((p->subs[SUB_CALLWAIT].zfd > -1) && (p->subs[SUB_THREEWAY].zfd > -1)) {
1935                                 ast_log(LOG_DEBUG, "Normal call hung up with both three way call and a call waiting call in place?\n");
1936                                 if (p->subs[SUB_CALLWAIT].inthreeway) {
1937                                         /* We had flipped over to answer a callwait and now it's gone */
1938                                         ast_log(LOG_DEBUG, "We were flipped over to the callwait, moving back and unowning.\n");
1939                                         /* Move to the call-wait, but un-own us until they flip back. */
1940                                         swap_subs(p, SUB_CALLWAIT, SUB_REAL);
1941                                         unalloc_sub(p, SUB_CALLWAIT);
1942                                         p->owner = NULL;
1943                                 } else {
1944                                         /* The three way hung up, but we still have a call wait */
1945                                         ast_log(LOG_DEBUG, "We were in the threeway and have a callwait still.  Ditching the threeway.\n");
1946                                         swap_subs(p, SUB_THREEWAY, SUB_REAL);
1947                                         unalloc_sub(p, SUB_THREEWAY);
1948                                         if (p->subs[SUB_REAL].inthreeway) {
1949                                                 /* This was part of a three way call.  Immediately make way for
1950                                                    another call */
1951                                                 ast_log(LOG_DEBUG, "Call was complete, setting owner to former third call\n");
1952                                                 p->owner = p->subs[SUB_REAL].owner;
1953                                         } else {
1954                                                 /* This call hasn't been completed yet...  Set owner to NULL */
1955                                                 ast_log(LOG_DEBUG, "Call was incomplete, setting owner to NULL\n");
1956                                                 p->owner = NULL;
1957                                         }
1958                                         p->subs[SUB_REAL].inthreeway = 0;
1959                                 }
1960                         } else if (p->subs[SUB_CALLWAIT].zfd > -1) {
1961                                 /* Move to the call-wait and switch back to them. */
1962                                 swap_subs(p, SUB_CALLWAIT, SUB_REAL);
1963                                 unalloc_sub(p, SUB_CALLWAIT);
1964                                 p->owner = p->subs[SUB_REAL].owner;
1965                                 if (p->owner->_state != AST_STATE_UP)
1966                                         p->subs[SUB_REAL].needanswer = 1;
1967                                 if (p->subs[SUB_REAL].owner->bridge)
1968                                         ast_moh_stop(p->subs[SUB_REAL].owner->bridge);
1969                         } else if (p->subs[SUB_THREEWAY].zfd > -1) {
1970                                 swap_subs(p, SUB_THREEWAY, SUB_REAL);
1971                                 unalloc_sub(p, SUB_THREEWAY);
1972                                 if (p->subs[SUB_REAL].inthreeway) {
1973                                         /* This was part of a three way call.  Immediately make way for
1974                                            another call */
1975                                         ast_log(LOG_DEBUG, "Call was complete, setting owner to former third call\n");
1976                                         p->owner = p->subs[SUB_REAL].owner;
1977                                 } else {
1978                                         /* This call hasn't been completed yet...  Set owner to NULL */
1979                                         ast_log(LOG_DEBUG, "Call was incomplete, setting owner to NULL\n");
1980                                         p->owner = NULL;
1981                                 }
1982                                 p->subs[SUB_REAL].inthreeway = 0;
1983                         }
1984                 } else if (index == SUB_CALLWAIT) {
1985                         /* Ditch the holding callwait call, and immediately make it availabe */
1986                         if (p->subs[SUB_CALLWAIT].inthreeway) {
1987                                 /* This is actually part of a three way, placed on hold.  Place the third part
1988                                    on music on hold now */
1989                                 if (p->subs[SUB_THREEWAY].owner && p->subs[SUB_THREEWAY].owner->bridge)
1990                                         ast_moh_start(p->subs[SUB_THREEWAY].owner->bridge, NULL);
1991                                 p->subs[SUB_THREEWAY].inthreeway = 0;
1992                                 /* Make it the call wait now */
1993                                 swap_subs(p, SUB_CALLWAIT, SUB_THREEWAY);
1994                                 unalloc_sub(p, SUB_THREEWAY);
1995                         } else
1996                                 unalloc_sub(p, SUB_CALLWAIT);
1997                 } else if (index == SUB_THREEWAY) {
1998                         if (p->subs[SUB_CALLWAIT].inthreeway) {
1999                                 /* The other party of the three way call is currently in a call-wait state.
2000                                    Start music on hold for them, and take the main guy out of the third call */
2001                                 if (p->subs[SUB_CALLWAIT].owner && p->subs[SUB_CALLWAIT].owner->bridge)
2002                                         ast_moh_start(p->subs[SUB_CALLWAIT].owner->bridge, NULL);
2003                                 p->subs[SUB_CALLWAIT].inthreeway = 0;
2004                         }
2005                         p->subs[SUB_REAL].inthreeway = 0;
2006                         /* If this was part of a three way call index, let us make
2007                            another three way call */
2008                         unalloc_sub(p, SUB_THREEWAY);
2009                 } else {
2010                         /* This wasn't any sort of call, but how are we an index? */
2011                         ast_log(LOG_WARNING, "Index found but not any type of call?\n");
2012                 }
2013         }
2014
2015
2016         if (!p->subs[SUB_REAL].owner && !p->subs[SUB_CALLWAIT].owner && !p->subs[SUB_THREEWAY].owner) {
2017                 p->owner = NULL;
2018                 p->ringt = 0;
2019                 p->distinctivering = 0;
2020                 p->confirmanswer = 0;
2021                 p->cidrings = 1;
2022                 p->outgoing = 0;
2023                 p->digital = 0;
2024                 p->faxhandled = 0;
2025                 p->pulsedial = 0;
2026                 p->onhooktime = time(NULL);
2027 #ifdef ZAPATA_PRI
2028                 p->proceeding = 0;
2029                 p->setup_ack = 0;
2030 #endif
2031                 if (p->dsp) {
2032                         ast_dsp_free(p->dsp);
2033                         p->dsp = NULL;
2034                 }
2035
2036                 law = ZT_LAW_DEFAULT;
2037                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_SETLAW, &law);
2038                 if (res < 0)
2039                         ast_log(LOG_WARNING, "Unable to set law on channel %d to default\n", p->channel);
2040                 /* Perform low level hangup if no owner left */
2041 #ifdef ZAPATA_PRI
2042                 if (p->pri) {
2043                         /* Make sure we have a call (or REALLY have a call in the case of a PRI) */
2044                         if (p->call && (!p->bearer || (p->bearer->call == p->call))) {
2045                                 if (!pri_grab(p, p->pri)) {
2046                                         if (p->alreadyhungup) {
2047                                                 ast_log(LOG_DEBUG, "Already hungup...  Calling hangup once, and clearing call\n");
2048                                                 pri_hangup(p->pri->pri, p->call, -1);
2049                                                 p->call = NULL;
2050                                                 if (p->bearer)
2051                                                         p->bearer->call = NULL;
2052                                         } else {
2053                                                 char *cause = pbx_builtin_getvar_helper(ast,"PRI_CAUSE");
2054                                                 int icause = ast->hangupcause ? hangup_cause2pri(ast->hangupcause) : -1;
2055                                                 ast_log(LOG_DEBUG, "Not yet hungup...  Calling hangup once with icause, and clearing call\n");
2056                                                 p->alreadyhungup = 1;
2057                                                 if (p->bearer)
2058                                                         p->bearer->alreadyhungup = 1;
2059                                                 if (cause) {
2060                                                         if (atoi(cause))
2061                                                                 icause = atoi(cause);
2062                                                 }
2063                                                 pri_hangup(p->pri->pri, p->call, icause);
2064                                         }
2065                                         if (res < 0)
2066                                                 ast_log(LOG_WARNING, "pri_disconnect failed\n");
2067                                         pri_rel(p->pri);
2068                                 } else {
2069                                         ast_log(LOG_WARNING, "Unable to grab PRI on span %d\n", p->span);
2070                                         res = -1;
2071                                 }
2072                         } else {
2073                                 if (p->bearer)
2074                                         ast_log(LOG_DEBUG, "Bearer call is %p, while ours is still %p\n", p->bearer->call, p->call);
2075                                 p->call = NULL;
2076                                 res = 0;
2077                         }
2078                 }
2079 #endif
2080 #ifdef ZAPATA_R2
2081                 if (p->sig == SIG_R2) {
2082                         if (p->hasr2call) {
2083                                 mfcr2_DropCall(p->r2, NULL, UC_NORMAL_CLEARING);
2084                                 p->hasr2call = 0;
2085                                 res = 0;
2086                         } else
2087                                 res = 0;
2088
2089                 }
2090 #endif
2091                 if (p->sig && (p->sig != SIG_PRI) && (p->sig != SIG_R2))
2092                         res = zt_set_hook(p->subs[SUB_REAL].zfd, ZT_ONHOOK);
2093                 if (res < 0) {
2094                         ast_log(LOG_WARNING, "Unable to hangup line %s\n", ast->name);
2095                 }
2096                 switch(p->sig) {
2097                 case SIG_FXOGS:
2098                 case SIG_FXOLS:
2099                 case SIG_FXOKS:
2100                         res = ioctl(p->subs[SUB_REAL].zfd, ZT_GET_PARAMS, &par);
2101                         if (!res) {
2102 #if 0
2103                                 ast_log(LOG_DEBUG, "Hanging up channel %d, offhook = %d\n", p->channel, par.rxisoffhook);
2104 #endif
2105                                 /* If they're off hook, try playing congestion */
2106                                 if (par.rxisoffhook)
2107                                         tone_zone_play_tone(p->subs[SUB_REAL].zfd, ZT_TONE_CONGESTION);
2108                                 else
2109                                         tone_zone_play_tone(p->subs[SUB_REAL].zfd, -1);
2110                         }
2111                         break;
2112                 case SIG_FXSGS:
2113                 case SIG_FXSLS:
2114                 case SIG_FXSKS:
2115                         /* Make sure we're not made available for at least two seconds */
2116                         time(&p->guardtime);
2117                         p->guardtime += 2;
2118                         break;
2119                 default:
2120                         tone_zone_play_tone(p->subs[SUB_REAL].zfd, -1);
2121                 }
2122                 if (p->cidspill)
2123                         free(p->cidspill);
2124                 if (p->sig)
2125                         zt_disable_ec(p);
2126                 x = 0;
2127                 ast_channel_setoption(ast,AST_OPTION_TONE_VERIFY,&x,sizeof(char),0);
2128                 ast_channel_setoption(ast,AST_OPTION_TDD,&x,sizeof(char),0);
2129                 p->didtdd = 0;
2130                 p->cidspill = NULL;
2131                 p->callwaitcas = 0;
2132                 p->callwaiting = p->permcallwaiting;
2133                 p->hidecallerid = p->permhidecallerid;
2134                 p->dialing = 0;
2135                 strcpy(p->rdnis, "");
2136                 update_conf(p);
2137                 /* Restore data mode */
2138                 if (p->sig == SIG_PRI) {
2139                         x = 0;
2140                         ast_channel_setoption(ast,AST_OPTION_AUDIO_MODE,&x,sizeof(char),0);
2141                 }
2142 #ifdef ZAPATA_PRI
2143                 if (p->bearer) {
2144                         ast_log(LOG_DEBUG, "Freeing up bearer channel %d\n", p->bearer->channel);
2145                         /* Free up the bearer channel as well, and
2146                            don't use its file descriptor anymore */
2147                         p->bearer->owner = NULL;
2148                         p->bearer = NULL;
2149                         p->subs[SUB_REAL].zfd = -1;
2150                         p->pri = NULL;
2151                 }
2152 #endif
2153                 restart_monitor();
2154         }
2155
2156
2157         p->callwaitingrepeat = 0;
2158         p->cidcwexpire = 0;
2159         ast->pvt->pvt = NULL;
2160         ast_mutex_unlock(&p->lock);
2161         ast_mutex_lock(&usecnt_lock);
2162         usecnt--;
2163         if (usecnt < 0)
2164                 ast_log(LOG_WARNING, "Usecnt < 0???\n");
2165         ast_mutex_unlock(&usecnt_lock);
2166         ast_update_use_count();
2167         if (option_verbose > 2)
2168                 ast_verbose( VERBOSE_PREFIX_3 "Hungup '%s'\n", ast->name);
2169
2170         ast_mutex_lock(&iflock);
2171         tmp = iflist;
2172         prev = NULL;
2173         if (p->destroy) {
2174                 while (tmp) {
2175                         if (tmp == p) {
2176                                 destroy_channel(prev, tmp, 0);
2177                                 break;
2178                         } else {
2179                                 prev = tmp;
2180                                 tmp = tmp->next;
2181                         }
2182                 }
2183         }
2184         ast_mutex_unlock(&iflock);
2185         return 0;
2186 }
2187
2188 static int zt_answer(struct ast_channel *ast)
2189 {
2190         struct zt_pvt *p = ast->pvt->pvt;
2191         int res=0;
2192         int index;
2193         int oldstate = ast->_state;
2194         ast_setstate(ast, AST_STATE_UP);
2195         ast_mutex_lock(&p->lock);
2196         index = zt_get_index(ast, p, 0);
2197         if (index < 0)
2198                 index = SUB_REAL;
2199         /* nothing to do if a radio channel */
2200         if (p->radio) {
2201                 ast_mutex_unlock(&p->lock);
2202                 return 0;
2203         }
2204         switch(p->sig) {
2205         case SIG_FXSLS:
2206         case SIG_FXSGS:
2207         case SIG_FXSKS:
2208                 p->ringt = 0;
2209                 /* Fall through */
2210         case SIG_EM:
2211         case SIG_EM_E1:
2212         case SIG_EMWINK:
2213         case SIG_FEATD:
2214         case SIG_FEATDMF:
2215         case SIG_E911:
2216         case SIG_FEATB:
2217         case SIG_SF:
2218         case SIG_SFWINK:
2219         case SIG_SF_FEATD:
2220         case SIG_SF_FEATDMF:
2221         case SIG_SF_FEATB:
2222         case SIG_FXOLS:
2223         case SIG_FXOGS:
2224         case SIG_FXOKS:
2225                 /* Pick up the line */
2226                 ast_log(LOG_DEBUG, "Took %s off hook\n", ast->name);
2227                 res =  zt_set_hook(p->subs[SUB_REAL].zfd, ZT_OFFHOOK);
2228                 tone_zone_play_tone(p->subs[index].zfd, -1);
2229                 p->dialing = 0;
2230                 if ((index == SUB_REAL) && p->subs[SUB_THREEWAY].inthreeway) {
2231                         if (oldstate == AST_STATE_RINGING) {
2232                                 ast_log(LOG_DEBUG, "Finally swapping real and threeway\n");
2233                                 tone_zone_play_tone(p->subs[SUB_THREEWAY].zfd, -1);
2234                                 swap_subs(p, SUB_THREEWAY, SUB_REAL);
2235                                 p->owner = p->subs[SUB_REAL].owner;
2236                         }
2237                 }
2238                 if (p->sig & __ZT_SIG_FXS) {
2239                         zt_enable_ec(p);
2240                         zt_train_ec(p);
2241                 }
2242                 break;
2243 #ifdef ZAPATA_PRI
2244         case SIG_PRI:
2245                 /* Send a pri acknowledge */
2246                 if (!pri_grab(p, p->pri)) {
2247                         p->proceeding = 2;
2248                         res = pri_answer(p->pri->pri, p->call, 0, 1);
2249                         pri_rel(p->pri);
2250                 } else {
2251                         ast_log(LOG_WARNING, "Unable to grab PRI on span %d\n", p->span);
2252                         res= -1;
2253                 }
2254                 break;
2255 #endif
2256 #ifdef ZAPATA_R2
2257         case SIG_R2:
2258                 res = mfcr2_AnswerCall(p->r2, NULL);
2259                 if (res)
2260                         ast_log(LOG_WARNING, "R2 Answer call failed :( on %s\n", ast->name);
2261                 break;
2262 #endif
2263         case 0:
2264                 ast_mutex_unlock(&p->lock);
2265                 return 0;
2266         default:
2267                 ast_log(LOG_WARNING, "Don't know how to answer signalling %d (channel %d)\n", p->sig, p->channel);
2268                 res = -1;
2269         }
2270         ast_mutex_unlock(&p->lock);
2271         return res;
2272 }
2273
2274 static int zt_setoption(struct ast_channel *chan, int option, void *data, int datalen)
2275 {
2276 char    *cp;
2277 int     x;
2278
2279         struct zt_pvt *p = chan->pvt->pvt;
2280
2281
2282         if ((option != AST_OPTION_TONE_VERIFY) && (option != AST_OPTION_AUDIO_MODE) &&
2283                 (option != AST_OPTION_TDD) && (option != AST_OPTION_RELAXDTMF))
2284            {
2285                 errno = ENOSYS;
2286                 return -1;
2287            }
2288         cp = (char *)data;
2289         if ((!cp) || (datalen < 1))
2290            {
2291                 errno = EINVAL;
2292                 return -1;
2293            }
2294         switch(option) {
2295             case AST_OPTION_TONE_VERIFY:
2296                 if (!p->dsp)
2297                         break;
2298                 switch(*cp) {
2299                     case 1:
2300                                 ast_log(LOG_DEBUG, "Set option TONE VERIFY, mode: MUTECONF(1) on %s\n",chan->name);
2301                                 ast_dsp_digitmode(p->dsp,DSP_DIGITMODE_MUTECONF | p->dtmfrelax);  /* set mute mode if desired */
2302                         break;
2303                     case 2:
2304                                 ast_log(LOG_DEBUG, "Set option TONE VERIFY, mode: MUTECONF/MAX(2) on %s\n",chan->name);
2305                                 ast_dsp_digitmode(p->dsp,DSP_DIGITMODE_MUTECONF | DSP_DIGITMODE_MUTEMAX | p->dtmfrelax);  /* set mute mode if desired */
2306                         break;
2307                     default:
2308                                 ast_log(LOG_DEBUG, "Set option TONE VERIFY, mode: OFF(0) on %s\n",chan->name);
2309                                 ast_dsp_digitmode(p->dsp,DSP_DIGITMODE_DTMF | p->dtmfrelax);  /* set mute mode if desired */
2310                         break;
2311                 }
2312                 break;
2313             case AST_OPTION_TDD:  /* turn on or off TDD */
2314                 if (!*cp) { /* turn it off */
2315                         ast_log(LOG_DEBUG, "Set option TDD MODE, value: OFF(0) on %s\n",chan->name);
2316                         if (p->tdd) tdd_free(p->tdd);
2317                         p->tdd = 0;
2318                         p->mate = 0;
2319                         break;
2320                 }
2321                 if (*cp == 2)
2322                         ast_log(LOG_DEBUG, "Set option TDD MODE, value: MATE(2) on %s\n",chan->name);
2323                 else ast_log(LOG_DEBUG, "Set option TDD MODE, value: ON(1) on %s\n",chan->name);
2324                 p->mate = 0;
2325                 zt_disable_ec(p);
2326                 /* otherwise, turn it on */
2327                 if (!p->didtdd) { /* if havent done it yet */
2328                         unsigned char mybuf[41000],*buf;
2329                         int size,res,fd,len;
2330                         int index;
2331                         struct pollfd fds[1];
2332                         buf = mybuf;
2333                         memset(buf,0x7f,sizeof(mybuf)); /* set to silence */
2334                         ast_tdd_gen_ecdisa(buf + 16000,16000);  /* put in tone */
2335                         len = 40000;
2336                         index = zt_get_index(chan, p, 0);
2337                         if (index < 0) {
2338                                 ast_log(LOG_WARNING, "No index in TDD?\n");
2339                                 return -1;
2340                         }
2341                         fd = p->subs[index].zfd;
2342                         while(len) {
2343                                 if (ast_check_hangup(chan)) return -1;
2344                                 size = len;
2345                                 if (size > READ_SIZE)
2346                                         size = READ_SIZE;
2347                                 fds[0].fd = fd;
2348                                 fds[0].events = POLLPRI | POLLOUT;
2349                                 res = poll(fds, 1, -1);
2350                                 if (!res) {
2351                                         ast_log(LOG_DEBUG, "poll (for write) ret. 0 on channel %d\n", p->channel);
2352                                         continue;
2353                                 }
2354                                   /* if got exception */
2355                                 if (fds[0].revents & POLLPRI) return -1;
2356                                 if (!(fds[0].revents & POLLOUT)) {
2357                                         ast_log(LOG_DEBUG, "write fd not ready on channel %d\n", p->channel);
2358                                         continue;
2359                                 }
2360                                 res = write(fd, buf, size);
2361                                 if (res != size) {
2362                                         if (res == -1) return -1;
2363                                         ast_log(LOG_DEBUG, "Write returned %d (%s) on channel %d\n", res, strerror(errno), p->channel);
2364                                         break;
2365                                 }
2366                                 len -= size;
2367                                 buf += size;
2368                         }
2369                         p->didtdd = 1; /* set to have done it now */
2370                 }
2371                 if (*cp == 2) { /* Mate mode */
2372                         if (p->tdd) tdd_free(p->tdd);
2373                         p->tdd = 0;
2374                         p->mate = 1;
2375                         break;
2376                         }
2377                 if (!p->tdd) { /* if we dont have one yet */
2378                         p->tdd = tdd_new(); /* allocate one */
2379                 }
2380                 break;
2381             case AST_OPTION_RELAXDTMF:  /* Relax DTMF decoding (or not) */
2382                 if (!*cp)
2383                 {
2384                         ast_log(LOG_DEBUG, "Set option RELAX DTMF, value: OFF(0) on %s\n",chan->name);
2385                         x = 0;
2386                 }
2387                 else
2388                 {
2389                         ast_log(LOG_DEBUG, "Set option RELAX DTMF, value: ON(1) on %s\n",chan->name);
2390                         x = 1;
2391                 }
2392                 ast_dsp_digitmode(p->dsp,x ? DSP_DIGITMODE_RELAXDTMF : DSP_DIGITMODE_DTMF | p->dtmfrelax);
2393                 break;
2394             case AST_OPTION_AUDIO_MODE:  /* Set AUDIO mode (or not) */
2395                 if (!*cp)
2396                 {
2397                         ast_log(LOG_DEBUG, "Set option AUDIO MODE, value: OFF(0) on %s\n",chan->name);
2398                         x = 0;
2399                         zt_disable_ec(p);
2400                 }
2401                 else
2402                 {
2403                         ast_log(LOG_DEBUG, "Set option AUDIO MODE, value: ON(1) on %s\n",chan->name);
2404                         x = 1;
2405                 }
2406                 if (ioctl(p->subs[SUB_REAL].zfd, ZT_AUDIOMODE, &x) == -1)
2407                         ast_log(LOG_WARNING, "Unable to set audio mode on channel %d to %d\n", p->channel, x);
2408                 break;
2409         }
2410         errno = 0;
2411         return 0;
2412 }
2413
2414 static void zt_unlink(struct zt_pvt *slave, struct zt_pvt *master, int needlock)
2415 {
2416         /* Unlink a specific slave or all slaves/masters from a given master */
2417         int x;
2418         int hasslaves;
2419         if (!master)
2420                 return;
2421         if (needlock) {
2422                 ast_mutex_lock(&master->lock);
2423                 if (slave) {
2424                         while(ast_mutex_trylock(&slave->lock)) {
2425                                 ast_mutex_unlock(&master->lock);
2426                                 usleep(1);
2427                                 ast_mutex_lock(&master->lock);
2428                         }
2429                 }
2430         }
2431         hasslaves = 0;
2432         for (x=0;x<MAX_SLAVES;x++) {
2433                 if (master->slaves[x]) {
2434                         if (!slave || (master->slaves[x] == slave)) {
2435                                 /* Take slave out of the conference */
2436                                 ast_log(LOG_DEBUG, "Unlinking slave %d from %d\n", master->slaves[x]->channel, master->channel);
2437                                 conf_del(master, &master->slaves[x]->subs[SUB_REAL], SUB_REAL);
2438                                 conf_del(master->slaves[x], &master->subs[SUB_REAL], SUB_REAL);
2439                                 master->slaves[x]->master = NULL;
2440                                 master->slaves[x] = NULL;
2441                         } else
2442                                 hasslaves = 1;
2443                 }
2444                 if (!hasslaves)
2445                         master->inconference = 0;
2446         }
2447         if (!slave) {
2448                 if (master->master) {
2449                         /* Take master out of the conference */
2450                         conf_del(master->master, &master->subs[SUB_REAL], SUB_REAL);
2451                         conf_del(master, &master->master->subs[SUB_REAL], SUB_REAL);
2452                         hasslaves = 0;
2453                         for (x=0;x<MAX_SLAVES;x++) {
2454                                 if (master->master->slaves[x] == master)
2455                                         master->master->slaves[x] = NULL;
2456                                 else if (master->master->slaves[x])
2457                                         hasslaves = 1;
2458                         }
2459                         if (!hasslaves)
2460                                 master->master->inconference = 0;
2461                 }
2462                 master->master = NULL;
2463         }
2464         update_conf(master);
2465         if (needlock) {
2466                 if (slave)
2467                         ast_mutex_unlock(&slave->lock);
2468                 ast_mutex_unlock(&master->lock);
2469         }
2470 }
2471
2472 static void zt_link(struct zt_pvt *slave, struct zt_pvt *master) {
2473         int x;
2474         if (!slave || !master) {
2475                 ast_log(LOG_WARNING, "Tried to link to/from NULL??\n");
2476                 return;
2477         }
2478         for (x=0;x<MAX_SLAVES;x++) {
2479                 if (!master->slaves[x]) {
2480                         master->slaves[x] = slave;
2481                         break;
2482                 }
2483         }
2484         if (x >= MAX_SLAVES) {
2485                 ast_log(LOG_WARNING, "Replacing slave %d with new slave, %d\n", master->slaves[MAX_SLAVES - 1]->channel, slave->channel);
2486                 master->slaves[MAX_SLAVES - 1] = slave;
2487         }
2488         if (slave->master)
2489                 ast_log(LOG_WARNING, "Replacing master %d with new master, %d\n", slave->master->channel, master->channel);
2490         slave->master = master;
2491
2492         ast_log(LOG_DEBUG, "Making %d slave to master %d at %d\n", slave->channel, master->channel, x);
2493 }
2494
2495 static int zt_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags, struct ast_frame **fo, struct ast_channel **rc)
2496 {
2497         struct ast_channel *who = NULL, *cs[3];
2498         struct zt_pvt *p0, *p1, *op0, *op1;
2499         struct zt_pvt *master=NULL, *slave=NULL;
2500         struct ast_frame *f;
2501         int to;
2502         int inconf = 0;
2503         int nothingok = 0;
2504         int ofd1, ofd2;
2505         int oi1, oi2, i1 = -1, i2 = -1, t1, t2;
2506         int os1 = -1, os2 = -1;
2507         struct ast_channel *oc1, *oc2;
2508
2509         /* if need DTMF, cant native bridge */
2510         if (flags & (AST_BRIDGE_DTMF_CHANNEL_0 | AST_BRIDGE_DTMF_CHANNEL_1))
2511                 return -2;
2512
2513         ast_mutex_lock(&c0->lock);
2514         ast_mutex_lock(&c1->lock);
2515
2516         p0 = c0->pvt->pvt;
2517         p1 = c1->pvt->pvt;
2518         /* cant do pseudo-channels here */
2519         if (!p0 || (!p0->sig) || !p1 || (!p1->sig)) {
2520                 ast_mutex_unlock(&c0->lock);
2521                 ast_mutex_unlock(&c1->lock);
2522                 return -2;
2523         }
2524
2525         op0 = p0 = c0->pvt->pvt;
2526         op1 = p1 = c1->pvt->pvt;
2527         ofd1 = c0->fds[0];
2528         ofd2 = c1->fds[0];
2529         oi1 = zt_get_index(c0, p0, 0);
2530         oi2 = zt_get_index(c1, p1, 0);
2531         oc1 = p0->owner;
2532         oc2 = p1->owner;
2533         if ((oi1 < 0) || (oi2 < 0)) {
2534                 ast_mutex_unlock(&c0->lock);
2535                 ast_mutex_unlock(&c1->lock);
2536                 return -1;
2537         }
2538
2539
2540
2541         ast_mutex_lock(&p0->lock);
2542         if (ast_mutex_trylock(&p1->lock)) {
2543                 /* Don't block, due to potential for deadlock */
2544                 ast_mutex_unlock(&p0->lock);
2545                 ast_mutex_unlock(&c0->lock);
2546                 ast_mutex_unlock(&c1->lock);
2547                 ast_log(LOG_NOTICE, "Avoiding deadlock...\n");
2548                 return -3;
2549         }
2550         if ((oi1 == SUB_REAL) && (oi2 == SUB_REAL)) {
2551                 if (!p0->owner || !p1->owner) {
2552                         /* Currently unowned -- Do nothing.  */
2553                         nothingok = 1;
2554                 } else {
2555                         /* If we don't have a call-wait in a 3-way, and we aren't in a 3-way, we can be master */
2556                         if (!p0->subs[SUB_CALLWAIT].inthreeway && !p1->subs[SUB_REAL].inthreeway) {
2557                                 master = p0;
2558                                 slave = p1;
2559                                 inconf = 1;
2560                         } else if (!p1->subs[SUB_CALLWAIT].inthreeway && !p0->subs[SUB_REAL].inthreeway) {
2561                                 master = p1;
2562                                 slave = p0;
2563                                 inconf = 1;
2564                         } else {
2565                                 ast_log(LOG_WARNING, "Huh?  Both calls are callwaits or 3-ways?  That's clever...?\n");
2566                                 ast_log(LOG_WARNING, "p0: chan %d/%d/CW%d/3W%d, p1: chan %d/%d/CW%d/3W%d\n", p0->channel, oi1, (p0->subs[SUB_CALLWAIT].zfd > -1) ? 1 : 0, p0->subs[SUB_REAL].inthreeway,
2567                                                 p0->channel, oi1, (p1->subs[SUB_CALLWAIT].zfd > -1) ? 1 : 0, p1->subs[SUB_REAL].inthreeway);
2568                         }
2569                 }
2570         } else if ((oi1 == SUB_REAL) && (oi2 == SUB_THREEWAY)) {
2571                 if (p1->subs[SUB_THREEWAY].inthreeway) {
2572                         master = p1;
2573                         slave = p0;
2574                 } else {
2575                         nothingok = 1;
2576                 }
2577         } else if ((oi1 == SUB_THREEWAY) && (oi2 == SUB_REAL)) {
2578                 if (p0->subs[SUB_THREEWAY].inthreeway) {
2579                         master = p0;
2580                         slave = p1;
2581                 } else {
2582                         nothingok  = 1;
2583                 }
2584         } else if ((oi1 == SUB_REAL) && (oi2 == SUB_CALLWAIT)) {
2585                 /* We have a real and a call wait.  If we're in a three way call, put us in it, otherwise,
2586                    don't put us in anything */
2587                 if (p1->subs[SUB_CALLWAIT].inthreeway) {
2588                         master = p1;
2589                         slave = p0;
2590                 } else {
2591                         nothingok = 1;
2592                 }
2593         } else if ((oi1 == SUB_CALLWAIT) && (oi2 == SUB_REAL)) {
2594                 /* Same as previous */
2595                 if (p0->subs[SUB_CALLWAIT].inthreeway) {
2596                         master = p0;
2597                         slave = p1;
2598                 } else {
2599                         nothingok = 1;
2600                 }
2601         }
2602         ast_log(LOG_DEBUG, "master: %d, slave: %d, nothingok: %d\n",
2603                 master ? master->channel : 0, slave ? slave->channel : 0, nothingok);
2604         if (master && slave) {
2605                 /* Stop any tones, or play ringtone as appropriate.  If they're bridged
2606                    in an active threeway call with a channel that is ringing, we should
2607                    indicate ringing. */
2608                 if ((oi2 == SUB_THREEWAY) &&
2609                         p1->subs[SUB_THREEWAY].inthreeway &&
2610                         p1->subs[SUB_REAL].owner &&
2611                         p1->subs[SUB_REAL].inthreeway &&
2612                         (p1->subs[SUB_REAL].owner->_state == AST_STATE_RINGING)) {
2613                                 ast_log(LOG_DEBUG, "Playing ringback on %s since %s is in a ringing three-way\n", c0->name, c1->name);
2614                                 tone_zone_play_tone(p0->subs[oi1].zfd, ZT_TONE_RINGTONE);
2615                                 os2 = p1->subs[SUB_REAL].owner->_state;
2616                 } else {
2617                                 ast_log(LOG_DEBUG, "Stoping tones on %d/%d talking to %d/%d\n", p0->channel, oi1, p1->channel, oi2);
2618                                 tone_zone_play_tone(p0->subs[oi1].zfd, -1);
2619                 }
2620                 if ((oi1 == SUB_THREEWAY) &&
2621                         p0->subs[SUB_THREEWAY].inthreeway &&
2622                         p0->subs[SUB_REAL].owner &&
2623                         p0->subs[SUB_REAL].inthreeway &&
2624                         (p0->subs[SUB_REAL].owner->_state == AST_STATE_RINGING)) {
2625                                 ast_log(LOG_DEBUG, "Playing ringback on %s since %s is in a ringing three-way\n", c1->name, c0->name);
2626                                 tone_zone_play_tone(p1->subs[oi2].zfd, ZT_TONE_RINGTONE);
2627                                 os1 = p0->subs[SUB_REAL].owner->_state;
2628                 } else {
2629                                 ast_log(LOG_DEBUG, "Stoping tones on %d/%d talking to %d/%d\n", p1->channel, oi2, p0->channel, oi1);
2630                                 tone_zone_play_tone(p1->subs[oi1].zfd, -1);
2631                 }
2632                 if ((oi1 == SUB_REAL) && (oi2 == SUB_REAL)) {
2633                         if (!p0->echocanbridged || !p1->echocanbridged) {
2634                                 /* Disable echo cancellation if appropriate */
2635                                 zt_disable_ec(p0);
2636                                 zt_disable_ec(p1);
2637                         }
2638                 }
2639                 zt_link(slave, master);
2640                 master->inconference = inconf;
2641         } else if (!nothingok)
2642                 ast_log(LOG_WARNING, "Can't link %d/%s with %d/%s\n", p0->channel, subnames[oi1], p1->channel, subnames[oi2]);
2643
2644         update_conf(p0);
2645         update_conf(p1);
2646         t1 = p0->subs[SUB_REAL].inthreeway;
2647         t2 = p1->subs[SUB_REAL].inthreeway;
2648
2649         ast_mutex_unlock(&p0->lock);
2650         ast_mutex_unlock(&p1->lock);
2651
2652         ast_mutex_unlock(&c0->lock);
2653         ast_mutex_unlock(&c1->lock);
2654
2655         /* Native bridge failed */
2656         if ((!master || !slave) && !nothingok) {
2657                 if (op0 == p0)
2658                         zt_enable_ec(p0);
2659                 if (op1 == p1)
2660                         zt_enable_ec(p1);
2661                 return -1;
2662         }
2663
2664         cs[0] = c0;
2665         cs[1] = c1;
2666         cs[2] = NULL;
2667         for (;;) {
2668                 /* Here's our main loop...  Start by locking things, looking for private parts,
2669                    and then balking if anything is wrong */
2670                 ast_mutex_lock(&c0->lock);
2671                 ast_mutex_lock(&c1->lock);
2672                 p0 = c0->pvt->pvt;
2673                 p1 = c1->pvt->pvt;
2674                 if (op0 == p0)
2675                         i1 = zt_get_index(c0, p0, 1);
2676                 if (op1 == p1)
2677                         i2 = zt_get_index(c1, p1, 1);
2678                 ast_mutex_unlock(&c0->lock);
2679                 ast_mutex_unlock(&c1->lock);
2680                 if ((op0 != p0) || (op1 != p1) ||
2681                     (ofd1 != c0->fds[0]) ||
2682                         (ofd2 != c1->fds[0]) ||
2683                     (p0->subs[SUB_REAL].owner && (os1 > -1) && (os1 != p0->subs[SUB_REAL].owner->_state)) ||
2684                     (p1->subs[SUB_REAL].owner && (os2 > -1) && (os2 != p1->subs[SUB_REAL].owner->_state)) ||
2685                     (oc1 != p0->owner) ||
2686                         (oc2 != p1->owner) ||
2687                         (t1 != p0->subs[SUB_REAL].inthreeway) ||
2688                         (t2 != p1->subs[SUB_REAL].inthreeway) ||
2689                         (oi1 != i1) ||
2690                         (oi2 != i2)) {
2691                         if (slave && master)
2692                                 zt_unlink(slave, master, 1);
2693                         ast_log(LOG_DEBUG, "Something changed out on %d/%d to %d/%d, returning -3 to restart\n",
2694                                                                         op0->channel, oi1, op1->channel, oi2);
2695                         if (op0 == p0)
2696                                 zt_enable_ec(p0);
2697                         if (op1 == p1)
2698                                 zt_enable_ec(p1);
2699                         return -3;
2700                 }
2701                 to = -1;
2702                 who = ast_waitfor_n(cs, 2, &to);
2703                 if (!who) {
2704                         ast_log(LOG_DEBUG, "Ooh, empty read...\n");
2705                         continue;
2706                 }
2707                 if (who->pvt->pvt == op0)
2708                         op0->ignoredtmf = 1;
2709                 else if (who->pvt->pvt == op1)
2710                         op1->ignoredtmf = 1;
2711                 f = ast_read(who);
2712                 if (who->pvt->pvt == op0)
2713                         op0->ignoredtmf = 0;
2714                 else if (who->pvt->pvt == op1)
2715                         op1->ignoredtmf = 0;
2716                 if (!f) {
2717                         *fo = NULL;
2718                         *rc = who;
2719                         if (slave && master)
2720                                 zt_unlink(slave, master, 1);
2721                         if (op0 == p0)
2722                                 zt_enable_ec(p0);
2723                         if (op1 == p1)
2724                                 zt_enable_ec(p1);
2725                         return 0;
2726                 }
2727                 if (f->frametype == AST_FRAME_DTMF) {
2728                         if (((who == c0) && (flags & AST_BRIDGE_DTMF_CHANNEL_0)) ||
2729                             ((who == c1) && (flags & AST_BRIDGE_DTMF_CHANNEL_1))) {
2730                                 *fo = f;
2731                                 *rc = who;
2732                                 if (slave && master)
2733                                         zt_unlink(slave, master, 1);
2734                                 return 0;
2735                         } else if ((who == c0) && p0->pulsedial) {
2736                                 ast_write(c1, f);
2737                         } else if ((who == c1) && p1->pulsedial) {
2738                                 ast_write(c0, f);
2739                         }
2740                 }
2741                 ast_frfree(f);
2742
2743                 /* Swap who gets priority */
2744                 cs[2] = cs[0];
2745                 cs[0] = cs[1];
2746                 cs[1] = cs[2];
2747         }
2748 }
2749
2750 static int zt_indicate(struct ast_channel *chan, int condition);
2751
2752 static int zt_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
2753 {
2754         struct zt_pvt *p = newchan->pvt->pvt;
2755         int x;
2756         ast_mutex_lock(&p->lock);
2757         ast_log(LOG_DEBUG, "New owner for channel %d is %s\n", p->channel, newchan->name);
2758         if (p->owner == oldchan) {
2759                 p->owner = newchan;
2760         }
2761         for (x=0;x<3;x++)
2762                 if (p->subs[x].owner == oldchan) {
2763                         if (!x)
2764                                 zt_unlink(NULL, p, 0);
2765                         p->subs[x].owner = newchan;
2766                 }
2767         if (newchan->_state == AST_STATE_RINGING)
2768                 zt_indicate(newchan, AST_CONTROL_RINGING);
2769         update_conf(p);
2770         ast_mutex_unlock(&p->lock);
2771         return 0;
2772 }
2773
2774 static int zt_ring_phone(struct zt_pvt *p)
2775 {
2776         int x;
2777         int res;
2778         /* Make sure our transmit state is on hook */
2779         x = 0;
2780         x = ZT_ONHOOK;
2781         res = ioctl(p->subs[SUB_REAL].zfd, ZT_HOOK, &x);
2782         do {
2783                 x = ZT_RING;
2784                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_HOOK, &x);
2785 #if 0
2786                 printf("Res: %d, error: %s\n", res, strerror(errno));
2787 #endif
2788                 if (res) {
2789                         switch(errno) {
2790                         case EBUSY:
2791                         case EINTR:
2792                                 /* Wait just in case */
2793                                 usleep(10000);
2794                                 continue;
2795                         case EINPROGRESS:
2796                                 res = 0;
2797                                 break;
2798                         default:
2799                                 ast_log(LOG_WARNING, "Couldn't ring the phone: %s\n", strerror(errno));
2800                                 res = 0;
2801                         }
2802                 }
2803         } while (res);
2804         return res;
2805 }
2806
2807 static void *ss_thread(void *data);
2808
2809 static struct ast_channel *zt_new(struct zt_pvt *, int, int, int, int, int);
2810
2811 static int attempt_transfer(struct zt_pvt *p)
2812 {
2813         /* In order to transfer, we need at least one of the channels to
2814            actually be in a call bridge.  We can't conference two applications
2815            together (but then, why would we want to?) */
2816         if (p->subs[SUB_REAL].owner->bridge) {
2817                 /* The three-way person we're about to transfer to could still be in MOH, so
2818                    stop if now if appropriate */
2819                 if (p->subs[SUB_THREEWAY].owner->bridge)
2820                         ast_moh_stop(p->subs[SUB_THREEWAY].owner->bridge);
2821                 if (p->subs[SUB_THREEWAY].owner->_state == AST_STATE_RINGING) {
2822                         ast_indicate(p->subs[SUB_REAL].owner->bridge, AST_CONTROL_RINGING);
2823                 }
2824                 if (ast_channel_masquerade(p->subs[SUB_THREEWAY].owner, p->subs[SUB_REAL].owner->bridge)) {
2825                         ast_log(LOG_WARNING, "Unable to masquerade %s as %s\n",
2826                                         p->subs[SUB_REAL].owner->bridge->name, p->subs[SUB_THREEWAY].owner->name);
2827                         return -1;
2828                 }
2829                 /* Orphan the channel */
2830                 unalloc_sub(p, SUB_THREEWAY);
2831         } else if (p->subs[SUB_THREEWAY].owner->bridge) {
2832                 if (p->subs[SUB_REAL].owner->_state == AST_STATE_RINGING) {
2833                         ast_indicate(p->subs[SUB_THREEWAY].owner->bridge, AST_CONTROL_RINGING);
2834                 }
2835                 ast_moh_stop(p->subs[SUB_THREEWAY].owner->bridge);
2836                 if (ast_channel_masquerade(p->subs[SUB_REAL].owner, p->subs[SUB_THREEWAY].owner->bridge)) {
2837                         ast_log(LOG_WARNING, "Unable to masquerade %s as %s\n",
2838                                         p->subs[SUB_THREEWAY].owner->bridge->name, p->subs[SUB_REAL].owner->name);
2839                         return -1;
2840                 }
2841                 swap_subs(p, SUB_THREEWAY, SUB_REAL);
2842                 unalloc_sub(p, SUB_THREEWAY);
2843                 /* Tell the caller not to hangup */
2844                 return 1;
2845         } else {
2846                 ast_log(LOG_DEBUG, "Neither %s nor %s are in a bridge, nothing to transfer\n",
2847                                         p->subs[SUB_REAL].owner->name, p->subs[SUB_THREEWAY].owner->name);
2848                 p->subs[SUB_THREEWAY].owner->_softhangup |= AST_SOFTHANGUP_DEV;
2849         }
2850         return 0;
2851 }
2852
2853 #ifdef ZAPATA_R2
2854 static struct ast_frame *handle_r2_event(struct zt_pvt *p, mfcr2_event_t *e, int index)
2855 {
2856         struct ast_frame *f;
2857         f = &p->subs[index].f;
2858         if (!p->r2) {
2859                 ast_log(LOG_WARNING, "Huh?  No R2 structure :(\n");
2860                 return NULL;
2861         }
2862         switch(e->e) {
2863         case MFCR2_EVENT_BLOCKED:
2864                 if (option_verbose > 2)
2865                         ast_verbose(VERBOSE_PREFIX_3 "Channel %d blocked\n", p->channel);
2866                 break;
2867         case MFCR2_EVENT_UNBLOCKED:
2868                 if (option_verbose > 2)
2869                         ast_verbose(VERBOSE_PREFIX_3 "Channel %d unblocked\n", p->channel);
2870                 break;
2871         case MFCR2_EVENT_CONFIG_ERR:
2872                 if (option_verbose > 2)
2873                         ast_verbose(VERBOSE_PREFIX_3 "Config error on channel %d\n", p->channel);
2874                 break;
2875         case MFCR2_EVENT_RING:
2876                 if (option_verbose > 2)
2877                         ast_verbose(VERBOSE_PREFIX_3 "Ring on channel %d\n", p->channel);
2878                 break;
2879         case MFCR2_EVENT_HANGUP:
2880                 if (option_verbose > 2)
2881                         ast_verbose(VERBOSE_PREFIX_3 "Hangup on channel %d\n", p->channel);
2882                 break;
2883         case MFCR2_EVENT_RINGING:
2884                 if (option_verbose > 2)
2885                         ast_verbose(VERBOSE_PREFIX_3 "Ringing on channel %d\n", p->channel);
2886                 break;
2887         case MFCR2_EVENT_ANSWER:
2888                 if (option_verbose > 2)
2889                         ast_verbose(VERBOSE_PREFIX_3 "Answer on channel %d\n", p->channel);
2890                 break;
2891         case MFCR2_EVENT_HANGUP_ACK:
2892                 if (option_verbose > 2)
2893                         ast_verbose(VERBOSE_PREFIX_3 "Hangup ACK on channel %d\n", p->channel);
2894                 break;
2895         case MFCR2_EVENT_IDLE:
2896                 if (option_verbose > 2)
2897                         ast_verbose(VERBOSE_PREFIX_3 "Idle on channel %d\n", p->channel);
2898                 break;
2899         default:
2900                 ast_log(LOG_WARNING, "Unknown MFC/R2 event %d\n", e->e);
2901                 break;
2902         }
2903         return f;
2904 }
2905
2906 static mfcr2_event_t *r2_get_event_bits(struct zt_pvt *p)
2907 {
2908         int x;
2909         int res;
2910         mfcr2_event_t *e;
2911         res = ioctl(p->subs[SUB_REAL].zfd, ZT_GETRXBITS, &x);
2912         if (res) {
2913                 ast_log(LOG_WARNING, "Unable to check received bits\n");
2914                 return NULL;
2915         }
2916         if (!p->r2) {
2917                 ast_log(LOG_WARNING, "Odd, no R2 structure on channel %d\n", p->channel);
2918                 return NULL;
2919         }
2920         e = mfcr2_cas_signaling_event(p->r2, x);
2921         return e;
2922 }
2923 #endif
2924
2925 static int check_for_conference(struct zt_pvt *p)
2926 {
2927         ZT_CONFINFO ci;
2928         /* Fine if we already have a master, etc */
2929         if (p->master || (p->confno > -1))
2930                 return 0;
2931         memset(&ci, 0, sizeof(ci));
2932         if (ioctl(p->subs[SUB_REAL].zfd, ZT_GETCONF, &ci)) {
2933                 ast_log(LOG_WARNING, "Failed to get conference info on channel %d\n", p->channel);
2934                 return 0;
2935         }
2936         /* If we have no master and don't have a confno, then
2937            if we're in a conference, it's probably a MeetMe room or
2938            some such, so don't let us 3-way out! */
2939         if ((p->subs[SUB_REAL].curconf.confno != ci.confno) || (p->subs[SUB_REAL].curconf.confmode != ci.confmode)) {
2940                 if (option_verbose > 2)
2941                         ast_verbose(VERBOSE_PREFIX_3 "Avoiding 3-way call when in an external conference\n");
2942                 return 1;
2943         }
2944         return 0;
2945 }
2946
2947 static int get_alarms(struct zt_pvt *p)
2948 {
2949         int res;
2950         ZT_SPANINFO zi;
2951         memset(&zi, 0, sizeof(zi));
2952         zi.spanno = p->span;
2953         res = ioctl(p->subs[SUB_REAL].zfd, ZT_SPANSTAT, &zi);
2954         if (res < 0) {
2955                 ast_log(LOG_WARNING, "Unable to determine alarm on channel %d\n", p->channel);
2956                 return 0;
2957         }
2958         return zi.alarms;
2959 }
2960
2961 static struct ast_frame *zt_handle_event(struct ast_channel *ast)
2962 {
2963         int res,x;
2964         int index;
2965         char *c;
2966         struct zt_pvt *p = ast->pvt->pvt;
2967         pthread_t threadid;
2968         pthread_attr_t attr;
2969         struct ast_channel *chan;
2970         pthread_attr_init(&attr);
2971         pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
2972         index = zt_get_index(ast, p, 0);
2973         p->subs[index].f.frametype = AST_FRAME_NULL;
2974         p->subs[index].f.datalen = 0;
2975         p->subs[index].f.samples = 0;
2976         p->subs[index].f.mallocd = 0;
2977         p->subs[index].f.offset = 0;
2978         p->subs[index].f.src = "zt_handle_event";
2979         p->subs[index].f.data = NULL;
2980         if (index < 0)
2981                 return &p->subs[index].f;
2982         if (p->fake_event) {
2983                 res = p->fake_event;
2984                 p->fake_event = 0;
2985         } else
2986                 res = zt_get_event(p->subs[index].zfd);
2987         ast_log(LOG_DEBUG, "Got event %s(%d) on channel %d (index %d)\n", event2str(res), res, p->channel, index);
2988         if (res & (ZT_EVENT_PULSEDIGIT | ZT_EVENT_DTMFDIGIT)) {
2989                 if (res & ZT_EVENT_PULSEDIGIT)
2990                         p->pulsedial = 1;
2991                 else
2992                         p->pulsedial = 0;
2993                 ast_log(LOG_DEBUG, "Pulse dial '%c'\n", res & 0xff);
2994            &