channels/chan_mgcp.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 1999 - 2006, Digium, Inc.
   5  *
   6  * Mark Spencer <markster@digium.com>
   7  *
   8  * See http://www.asterisk.org for more information about
   9  * the Asterisk project. Please do not directly contact
  10  * any of the maintainers of this project for assistance;
  11  * the project provides a web site, mailing lists and IRC
  12  * channels for your use.
  13  *
  14  * This program is free software, distributed under the terms of
  15  * the GNU General Public License Version 2. See the LICENSE file
  16  * at the top of the source tree.
  17  */
  18
  19 /*! \file
  20  *
  21  * \brief Implementation of Media Gateway Control Protocol
  22  *
  23  * \author Mark Spencer <markster@digium.com>
  24  *
  25  * \par See also
  26  * \arg \ref Config_mgcp
  27  * \arg \ref res_pktccops
  28  *
  29  * \ingroup channel_drivers
  30  */
  31
  32 /*** MODULEINFO
  33         <depend>res_pktccops</depend>
  34  ***/
  35
  36 #include "asterisk.h"
  37
  38 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  39
  40 #include <sys/socket.h>
  41 #include <sys/ioctl.h>
  42 #include <net/if.h>
  43 #include <fcntl.h>
  44 #include <netdb.h>
  45 #include <sys/signal.h>
  46 #include <signal.h>
  47 #include <netinet/in.h>
  48 #include <netinet/in_systm.h>
  49 #include <netinet/ip.h>
  50 #include <arpa/inet.h>
  51 #include <ctype.h>
  52
  53 #include "asterisk/lock.h"
  54 #include "asterisk/channel.h"
  55 #include "asterisk/config.h"
  56 #include "asterisk/module.h"
  57 #include "asterisk/pbx.h"
  58 #include "asterisk/sched.h"
  59 #include "asterisk/io.h"
  60 #include "asterisk/rtp_engine.h"
  61 #include "asterisk/acl.h"
  62 #include "asterisk/callerid.h"
  63 #include "asterisk/cli.h"
  64 #include "asterisk/say.h"
  65 #include "asterisk/cdr.h"
  66 #include "asterisk/astdb.h"
  67 #include "asterisk/features.h"
  68 #include "asterisk/app.h"
  69 #include "asterisk/musiconhold.h"
  70 #include "asterisk/utils.h"
  71 #include "asterisk/netsock.h"
  72 #include "asterisk/causes.h"
  73 #include "asterisk/dsp.h"
  74 #include "asterisk/devicestate.h"
  75 #include "asterisk/stringfields.h"
  76 #include "asterisk/abstract_jb.h"
  77 #include "asterisk/event.h"
  78 #include "asterisk/chanvars.h"
  79 #include "asterisk/pktccops.h"
  80
  81 /*
  82  * Define to work around buggy dlink MGCP phone firmware which
  83  * appears not to know that "rt" is part of the "G" package.
  84  */
  85 /* #define DLINK_BUGGY_FIRMWARE */
  86
  87 #define MGCPDUMPER
  88 #define DEFAULT_EXPIRY  120
  89 #define MAX_EXPIRY      3600
  90 #define DIRECTMEDIA     1
  91
  92 #ifndef INADDR_NONE
  93 #define INADDR_NONE (in_addr_t)(-1)
  94 #endif
  95
  96 /*! Global jitterbuffer configuration - by default, jb is disabled */
  97 static struct ast_jb_conf default_jbconf =
  98 {
  99         .flags = 0,
 100         .max_size = -1,
 101         .resync_threshold = -1,
 102         .impl = "",
 103         .target_extra = -1,
 104 };
 105 static struct ast_jb_conf global_jbconf;
 106
 107 static const char tdesc[] = "Media Gateway Control Protocol (MGCP)";
 108 static const char config[] = "mgcp.conf";
 109
 110 #define MGCP_DTMF_RFC2833       (1 << 0)
 111 #define MGCP_DTMF_INBAND        (1 << 1)
 112 #define MGCP_DTMF_HYBRID        (1 << 2)
 113
 114 #define DEFAULT_MGCP_GW_PORT    2427 /*!< From RFC 2705 */
 115 #define DEFAULT_MGCP_CA_PORT    2727 /*!< From RFC 2705 */
 116 #define MGCP_MAX_PACKET         1500 /*!< Also from RFC 2543, should sub headers tho */
 117 #define DEFAULT_RETRANS         1000 /*!< How frequently to retransmit */
 118 #define MAX_RETRANS             5    /*!< Try only 5 times for retransmissions */
 119
 120 /*! MGCP rtp stream modes { */
 121 #define MGCP_CX_SENDONLY        0
 122 #define MGCP_CX_RECVONLY        1
 123 #define MGCP_CX_SENDRECV        2
 124 #define MGCP_CX_CONF            3
 125 #define MGCP_CX_CONFERENCE      3
 126 #define MGCP_CX_MUTE            4
 127 #define MGCP_CX_INACTIVE        4
 128 /*! } */
 129
 130 static const char * const mgcp_cxmodes[] = {
 131         "sendonly",
 132         "recvonly",
 133         "sendrecv",
 134         "confrnce",
 135         "inactive"
 136 };
 137
 138 enum {
 139         MGCP_CMD_EPCF,
 140         MGCP_CMD_CRCX,
 141         MGCP_CMD_MDCX,
 142         MGCP_CMD_DLCX,
 143         MGCP_CMD_RQNT,
 144         MGCP_CMD_NTFY,
 145         MGCP_CMD_AUEP,
 146         MGCP_CMD_AUCX,
 147         MGCP_CMD_RSIP
 148 };
 149
 150 static char context[AST_MAX_EXTENSION] = "default";
 151
 152 static char language[MAX_LANGUAGE] = "";
 153 static char musicclass[MAX_MUSICCLASS] = "";
 154 static char parkinglot[AST_MAX_CONTEXT];
 155 static char cid_num[AST_MAX_EXTENSION] = "";
 156 static char cid_name[AST_MAX_EXTENSION] = "";
 157
 158 static int dtmfmode = 0;
 159 static int nat = 0;
 160 static int ncs = 0;
 161 static int pktcgatealloc = 0;
 162 static int hangupongateremove = 0;
 163
 164 static ast_group_t cur_callergroup = 0;
 165 static ast_group_t cur_pickupgroup = 0;
 166
 167 static struct {
 168         unsigned int tos;
 169         unsigned int tos_audio;
 170         unsigned int cos;
 171         unsigned int cos_audio;
 172 } qos = { 0, 0, 0, 0 };
 173
 174 static int immediate = 0;
 175
 176 static int callwaiting = 0;
 177
 178 static int callreturn = 0;
 179
 180 static int slowsequence = 0;
 181
 182 static int threewaycalling = 0;
 183
 184 /*! This is for flashhook transfers */
 185 static int transfer = 0;
 186
 187 static int cancallforward = 0;
 188
 189 static int singlepath = 0;
 190
 191 static int directmedia = DIRECTMEDIA;
 192
 193 static char accountcode[AST_MAX_ACCOUNT_CODE] = "";
 194
 195 static char mailbox[AST_MAX_EXTENSION];
 196
 197 static int amaflags = 0;
 198
 199 static int adsi = 0;
 200
 201 static unsigned int oseq;
 202
 203 /*! Wait up to 16 seconds for first digit (FXO logic) */
 204 static int firstdigittimeout = 16000;
 205
 206 /*! How long to wait for following digits (FXO logic) */
 207 static int gendigittimeout = 8000;
 208
 209 /*! How long to wait for an extra digit, if there is an ambiguous match */
 210 static int matchdigittimeout = 3000;
 211
 212 /*! Protect the monitoring thread, so only one process can kill or start it, and not
 213     when it's doing something critical. */
 214 AST_MUTEX_DEFINE_STATIC(netlock);
 215
 216 AST_MUTEX_DEFINE_STATIC(monlock);
 217
 218 /*! This is the thread for the monitor which checks for input on the channels
 219  *  which are not currently in use.
 220  */
 221 static pthread_t monitor_thread = AST_PTHREADT_NULL;
 222
 223 static int restart_monitor(void);
 224
 225 static format_t capability = AST_FORMAT_ULAW;
 226 static int nonCodecCapability = AST_RTP_DTMF;
 227
 228 static char ourhost[MAXHOSTNAMELEN];
 229 static struct in_addr __ourip;
 230 static int ourport;
 231
 232 static int mgcpdebug = 0;
 233
 234 static struct sched_context *sched;
 235 static struct io_context *io;
 236 /*! The private structures of the mgcp channels are linked for
 237  * selecting outgoing channels
 238  */
 239
 240 #define MGCP_MAX_HEADERS        64
 241 #define MGCP_MAX_LINES          64
 242
 243 struct mgcp_request {
 244         int len;
 245         char *verb;
 246         char *identifier;
 247         char *endpoint;
 248         char *version;
 249         int headers;                    /*!< MGCP Headers */
 250         char *header[MGCP_MAX_HEADERS];
 251         int lines;                      /*!< SDP Content */
 252         char *line[MGCP_MAX_LINES];
 253         char data[MGCP_MAX_PACKET];
 254         int cmd;                        /*!< int version of verb = command */
 255         unsigned int trid;              /*!< int version of identifier = transaction id */
 256         struct mgcp_request *next;      /*!< next in the queue */
 257 };
 258
 259 /*! \brief mgcp_message: MGCP message for queuing up */
 260 struct mgcp_message {
 261         struct mgcp_endpoint *owner_ep;
 262         struct mgcp_subchannel *owner_sub;
 263         int retrans;
 264         unsigned long expire;
 265         unsigned int seqno;
 266         int len;
 267         struct mgcp_message *next;
 268         char buf[0];
 269 };
 270
 271 #define RESPONSE_TIMEOUT 30     /*!< in seconds */
 272
 273 struct mgcp_response {
 274         time_t whensent;
 275         int len;
 276         int seqno;
 277         struct mgcp_response *next;
 278         char buf[0];
 279 };
 280
 281 #define MAX_SUBS 2
 282
 283 #define SUB_REAL 0
 284 #define SUB_ALT  1
 285
 286 struct mgcp_subchannel {
 287         /*! subchannel magic string.
 288            Needed to prove that any subchannel pointer passed by asterisk
 289            really points to a valid subchannel memory area.
 290            Ugly.. But serves the purpose for the time being.
 291          */
 292 #define MGCP_SUBCHANNEL_MAGIC "!978!"
 293         char magic[6];
 294         ast_mutex_t lock;
 295         int id;
 296         struct ast_channel *owner;
 297         struct mgcp_endpoint *parent;
 298         struct ast_rtp_instance *rtp;
 299         struct sockaddr_in tmpdest;
 300         char txident[80]; /*! \todo FIXME txident is replaced by rqnt_ident in endpoint.
 301                         This should be obsoleted */
 302         char cxident[80];
 303         char callid[80];
 304         int cxmode;
 305         struct mgcp_request *cx_queue; /*!< pending CX commands */
 306         ast_mutex_t cx_queue_lock;     /*!< CX queue lock */
 307         int nat;
 308         int iseq;                      /*!< Not used? RTP? */
 309         int outgoing;
 310         int alreadygone;
 311         int sdpsent;
 312         struct cops_gate *gate;
 313         struct mgcp_subchannel *next;  /*!< for out circular linked list */
 314 };
 315
 316 #define MGCP_ONHOOK  1
 317 #define MGCP_OFFHOOK 2
 318
 319 #define TYPE_TRUNK 1
 320 #define TYPE_LINE  2
 321
 322 struct mgcp_endpoint {
 323         ast_mutex_t lock;
 324         char name[80];
 325         struct mgcp_subchannel *sub;            /*!< Pointer to our current connection, channel and stuff */
 326         char accountcode[AST_MAX_ACCOUNT_CODE];
 327         char exten[AST_MAX_EXTENSION];          /*!< Extention where to start */
 328         char context[AST_MAX_EXTENSION];
 329         char language[MAX_LANGUAGE];
 330         char cid_num[AST_MAX_EXTENSION];        /*!< Caller*ID number */
 331         char cid_name[AST_MAX_EXTENSION];       /*!< Caller*ID name */
 332         char lastcallerid[AST_MAX_EXTENSION];   /*!< Last Caller*ID */
 333         char dtmf_buf[AST_MAX_EXTENSION];       /*!< place to collect digits be */
 334         char call_forward[AST_MAX_EXTENSION];   /*!< Last Caller*ID */
 335         char musicclass[MAX_MUSICCLASS];
 336         char curtone[80];                       /*!< Current tone */
 337         char mailbox[AST_MAX_EXTENSION];
 338         char parkinglot[AST_MAX_CONTEXT];   /*!< Parkinglot */
 339         struct ast_event_sub *mwi_event_sub;
 340         ast_group_t callgroup;
 341         ast_group_t pickupgroup;
 342         int callwaiting;
 343         int hascallwaiting;
 344         int transfer;
 345         int threewaycalling;
 346         int singlepath;
 347         int cancallforward;
 348         int directmedia;
 349         int callreturn;
 350         int dnd; /* How does this affect callwait? Do we just deny a mgcp_request if we're dnd? */
 351         int hascallerid;
 352         int hidecallerid;
 353         int dtmfmode;
 354         int amaflags;
 355         int ncs;
 356         int pktcgatealloc;
 357         int hangupongateremove;
 358         int type;
 359         int slowsequence;                       /*!< MS: Sequence the endpoint as a whole */
 360         int group;
 361         int iseq; /*!< Not used? */
 362         int lastout; /*!< tracking this on the subchannels.  Is it needed here? */
 363         int needdestroy; /*!< Not used? */
 364         format_t capability;
 365         int nonCodecCapability;
 366         int onhooktime;
 367         int msgstate; /*!< voicemail message state */
 368         int immediate;
 369         int hookstate;
 370         int adsi;
 371         char rqnt_ident[80];             /*!< request identifier */
 372         struct mgcp_request *rqnt_queue; /*!< pending RQNT commands */
 373         ast_mutex_t rqnt_queue_lock;
 374         struct mgcp_request *cmd_queue;  /*!< pending commands other than RQNT */
 375         ast_mutex_t cmd_queue_lock;
 376         int delme;                       /*!< needed for reload */
 377         int needaudit;                   /*!< needed for reload */
 378         struct ast_dsp *dsp; /*!< XXX Should there be a dsp/subchannel? XXX */
 379         /* owner is tracked on the subchannels, and the *sub indicates whos in charge */
 380         /* struct ast_channel *owner; */
 381         /* struct ast_rtp *rtp; */
 382         /* struct sockaddr_in tmpdest; */
 383         /* message go the the endpoint and not the channel so they stay here */
 384         struct ast_variable *chanvars;          /*!< Variables to set for channel created by user */
 385         struct mgcp_endpoint *next;
 386         struct mgcp_gateway *parent;
 387 };
 388
 389 static struct mgcp_gateway {
 390         /* A gateway containing one or more endpoints */
 391         char name[80];
 392         int isnamedottedip; /*!< is the name FQDN or dotted ip */
 393         struct sockaddr_in addr;
 394         struct sockaddr_in defaddr;
 395         struct in_addr ourip;
 396         int dynamic;
 397         int expire;             /*!< XXX Should we ever expire dynamic registrations? XXX */
 398         struct mgcp_endpoint *endpoints;
 399         struct ast_ha *ha;
 400 /* obsolete
 401         time_t lastouttime;
 402         int lastout;
 403         int messagepending;
 404 */
 405 /* Wildcard endpoint name */
 406         char wcardep[30];
 407         struct mgcp_message *msgs; /*!< gw msg queue */
 408         ast_mutex_t msgs_lock;     /*!< queue lock */
 409         int retransid;             /*!< retrans timer id */
 410         int delme;                 /*!< needed for reload */
 411         int realtime;
 412         struct mgcp_response *responses;
 413         struct mgcp_gateway *next;
 414 } *gateways = NULL;
 415
 416 AST_MUTEX_DEFINE_STATIC(mgcp_reload_lock);
 417 static int mgcp_reloading = 0;
 418
 419 /*! \brief gatelock: mutex for gateway/endpoint lists */
 420 AST_MUTEX_DEFINE_STATIC(gatelock);
 421
 422 static int mgcpsock  = -1;
 423
 424 static struct sockaddr_in bindaddr;
 425
 426 static struct ast_frame  *mgcp_read(struct ast_channel *ast);
 427 static int transmit_response(struct mgcp_subchannel *sub, char *msg, struct mgcp_request *req, char *msgrest);
 428 static int transmit_notify_request(struct mgcp_subchannel *sub, char *tone);
 429 static int transmit_modify_request(struct mgcp_subchannel *sub);
 430 static int transmit_connect(struct mgcp_subchannel *sub);
 431 static int transmit_notify_request_with_callerid(struct mgcp_subchannel *sub, char *tone, char *callernum, char *callername);
 432 static int transmit_modify_with_sdp(struct mgcp_subchannel *sub, struct ast_rtp_instance *rtp, format_t codecs);
 433 static int transmit_connection_del(struct mgcp_subchannel *sub);
 434 static int transmit_audit_endpoint(struct mgcp_endpoint *p);
 435 static void start_rtp(struct mgcp_subchannel *sub);
 436 static void handle_response(struct mgcp_endpoint *p, struct mgcp_subchannel *sub,
 437                             int result, unsigned int ident, struct mgcp_request *resp);
 438 static void dump_cmd_queues(struct mgcp_endpoint *p, struct mgcp_subchannel *sub);
 439 static char *mgcp_reload(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
 440 static int reload_config(int reload);
 441
 442 static struct ast_channel *mgcp_request(const char *type, format_t format, const struct ast_channel *requestor, void *data, int *cause);
 443 static int mgcp_call(struct ast_channel *ast, char *dest, int timeout);
 444 static int mgcp_hangup(struct ast_channel *ast);
 445 static int mgcp_answer(struct ast_channel *ast);
 446 static struct ast_frame *mgcp_read(struct ast_channel *ast);
 447 static int mgcp_write(struct ast_channel *ast, struct ast_frame *frame);
 448 static int mgcp_indicate(struct ast_channel *ast, int ind, const void *data, size_t datalen);
 449 static int mgcp_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);
 450 static int mgcp_senddigit_begin(struct ast_channel *ast, char digit);
 451 static int mgcp_senddigit_end(struct ast_channel *ast, char digit, unsigned int duration);
 452 static int mgcp_devicestate(void *data);
 453 static void add_header_offhook(struct mgcp_subchannel *sub, struct mgcp_request *resp, char *tone);
 454 static int transmit_connect_with_sdp(struct mgcp_subchannel *sub, struct ast_rtp_instance *rtp);
 455 static struct mgcp_gateway *build_gateway(char *cat, struct ast_variable *v);
 456 static int mgcp_alloc_pktcgate(struct mgcp_subchannel *sub);
 457 static int acf_channel_read(struct ast_channel *chan, const char *funcname, char *preparse, char *buf, size_t buflen);
 458 static struct ast_variable *add_var(const char *buf, struct ast_variable *list);
 459 static struct ast_variable *copy_vars(struct ast_variable *src);
 460
 461 static const struct ast_channel_tech mgcp_tech = {
 462         .type = "MGCP",
 463         .description = tdesc,
 464         .capabilities = AST_FORMAT_ULAW | AST_FORMAT_ALAW,
 465         .properties = AST_CHAN_TP_WANTSJITTER | AST_CHAN_TP_CREATESJITTER,
 466         .requester = mgcp_request,
 467         .devicestate = mgcp_devicestate,
 468         .call = mgcp_call,
 469         .hangup = mgcp_hangup,
 470         .answer = mgcp_answer,
 471         .read = mgcp_read,
 472         .write = mgcp_write,
 473         .indicate = mgcp_indicate,
 474         .fixup = mgcp_fixup,
 475         .send_digit_begin = mgcp_senddigit_begin,
 476         .send_digit_end = mgcp_senddigit_end,
 477         .bridge = ast_rtp_instance_bridge,
 478         .func_channel_read = acf_channel_read,
 479 };
 480
 481 static void mwi_event_cb(const struct ast_event *event, void *userdata)
 482 {
 483         /* This module does not handle MWI in an event-based manner.  However, it
 484          * subscribes to MWI for each mailbox that is configured so that the core
 485          * knows that we care about it.  Then, chan_mgcp will get the MWI from the
 486          * event cache instead of checking the mailbox directly. */
 487 }
 488
 489 static int has_voicemail(struct mgcp_endpoint *p)
 490 {
 491         int new_msgs;
 492         struct ast_event *event;
 493         char *mbox, *cntx;
 494
 495         cntx = mbox = ast_strdupa(p->mailbox);
 496         strsep(&cntx, "@");
 497         if (ast_strlen_zero(cntx))
 498                 cntx = "default";
 499
 500         event = ast_event_get_cached(AST_EVENT_MWI,
 501                 AST_EVENT_IE_MAILBOX, AST_EVENT_IE_PLTYPE_STR, mbox,
 502                 AST_EVENT_IE_CONTEXT, AST_EVENT_IE_PLTYPE_STR, cntx,
 503                 AST_EVENT_IE_END);
 504
 505         if (event) {
 506                 new_msgs = ast_event_get_ie_uint(event, AST_EVENT_IE_NEWMSGS);
 507                 ast_event_destroy(event);
 508         } else
 509                 new_msgs = ast_app_has_voicemail(p->mailbox, NULL);
 510
 511         return new_msgs;
 512 }
 513
 514 static int unalloc_sub(struct mgcp_subchannel *sub)
 515 {
 516         struct mgcp_endpoint *p = sub->parent;
 517         if (p->sub == sub) {
 518                 ast_log(LOG_WARNING, "Trying to unalloc the real channel %s@%s?!?\n", p->name, p->parent->name);
 519                 return -1;
 520         }
 521         ast_debug(1, "Released sub %d of channel %s@%s\n", sub->id, p->name, p->parent->name);
 522
 523         sub->owner = NULL;
 524         if (!ast_strlen_zero(sub->cxident)) {
 525                 transmit_connection_del(sub);
 526         }
 527         sub->cxident[0] = '\0';
 528         sub->callid[0] = '\0';
 529         sub->cxmode = MGCP_CX_INACTIVE;
 530         sub->outgoing = 0;
 531         sub->alreadygone = 0;
 532         memset(&sub->tmpdest, 0, sizeof(sub->tmpdest));
 533         if (sub->rtp) {
 534                 ast_rtp_instance_destroy(sub->rtp);
 535                 sub->rtp = NULL;
 536         }
 537         dump_cmd_queues(NULL, sub);
 538         return 0;
 539 }
 540
 541 /* modified for new transport mechanism */
 542 static int __mgcp_xmit(struct mgcp_gateway *gw, char *data, int len)
 543 {
 544         int res;
 545         if (gw->addr.sin_addr.s_addr)
 546                 res=sendto(mgcpsock, data, len, 0, (struct sockaddr *)&gw->addr, sizeof(struct sockaddr_in));
 547         else
 548                 res=sendto(mgcpsock, data, len, 0, (struct sockaddr *)&gw->defaddr, sizeof(struct sockaddr_in));
 549         if (res != len) {
 550                 ast_log(LOG_WARNING, "mgcp_xmit returned %d: %s\n", res, strerror(errno));
 551         }
 552         return res;
 553 }
 554
 555 static int resend_response(struct mgcp_subchannel *sub, struct mgcp_response *resp)
 556 {
 557         struct mgcp_endpoint *p = sub->parent;
 558         int res;
 559         ast_debug(1, "Retransmitting:\n%s\n to %s:%d\n", resp->buf, ast_inet_ntoa(p->parent->addr.sin_addr), ntohs(p->parent->addr.sin_port));
 560         res = __mgcp_xmit(p->parent, resp->buf, resp->len);
 561         if (res > 0)
 562                 res = 0;
 563         return res;
 564 }
 565
 566 static int send_response(struct mgcp_subchannel *sub, struct mgcp_request *req)
 567 {
 568         struct mgcp_endpoint *p = sub->parent;
 569         int res;
 570         ast_debug(1, "Transmitting:\n%s\n to %s:%d\n", req->data, ast_inet_ntoa(p->parent->addr.sin_addr), ntohs(p->parent->addr.sin_port));
 571         res = __mgcp_xmit(p->parent, req->data, req->len);
 572         if (res > 0)
 573                 res = 0;
 574         return res;
 575 }
 576
 577 /* modified for new transport framework */
 578 static void dump_queue(struct mgcp_gateway *gw, struct mgcp_endpoint *p)
 579 {
 580         struct mgcp_message *cur, *q = NULL, *w, *prev;
 581
 582         ast_mutex_lock(&gw->msgs_lock);
 583         for (prev = NULL, cur = gw->msgs; cur; prev = cur, cur = cur->next) {
 584                 if (!p || cur->owner_ep == p) {
 585                         if (prev) {
 586                                 prev->next = cur->next;
 587                         } else {
 588                                 gw->msgs = cur->next;
 589                         }
 590
 591                         ast_log(LOG_NOTICE, "Removing message from %s transaction %u\n",
 592                                 gw->name, cur->seqno);
 593
 594                         w = cur;
 595                         if (q) {
 596                                 w->next = q;
 597                         } else {
 598                                 w->next = NULL;
 599                         }
 600                         q = w;
 601                 }
 602         }
 603         ast_mutex_unlock(&gw->msgs_lock);
 604
 605         while (q) {
 606                 cur = q;
 607                 q = q->next;
 608                 ast_free(cur);
 609         }
 610 }
 611
 612 static void mgcp_queue_frame(struct mgcp_subchannel *sub, struct ast_frame *f)
 613 {
 614         for (;;) {
 615                 if (sub->owner) {
 616                         if (!ast_channel_trylock(sub->owner)) {
 617                                 ast_queue_frame(sub->owner, f);
 618                                 ast_channel_unlock(sub->owner);
 619                                 break;
 620                         } else {
 621                                 DEADLOCK_AVOIDANCE(&sub->lock);
 622                         }
 623                 } else {
 624                         break;
 625                 }
 626         }
 627 }
 628
 629 static void mgcp_queue_hangup(struct mgcp_subchannel *sub)
 630 {
 631         for (;;) {
 632                 if (sub->owner) {
 633                         if (!ast_channel_trylock(sub->owner)) {
 634                                 ast_queue_hangup(sub->owner);
 635                                 ast_channel_unlock(sub->owner);
 636                                 break;
 637                         } else {
 638                                 DEADLOCK_AVOIDANCE(&sub->lock);
 639                         }
 640                 } else {
 641                         break;
 642                 }
 643         }
 644 }
 645
 646 static void mgcp_queue_control(struct mgcp_subchannel *sub, int control)
 647 {
 648         struct ast_frame f = { AST_FRAME_CONTROL, { control } };
 649         return mgcp_queue_frame(sub, &f);
 650 }
 651
 652 static int retrans_pkt(const void *data)
 653 {
 654         struct mgcp_gateway *gw = (struct mgcp_gateway *)data;
 655         struct mgcp_message *cur, *exq = NULL, *w, *prev;
 656         int res = 0;
 657
 658         /* find out expired msgs */
 659         ast_mutex_lock(&gw->msgs_lock);
 660
 661         for (prev = NULL, cur = gw->msgs; cur; prev = cur, cur = cur->next) {
 662                 if (cur->retrans < MAX_RETRANS) {
 663                         cur->retrans++;
 664                         ast_debug(1, "Retransmitting #%d transaction %u on [%s]\n",
 665                                 cur->retrans, cur->seqno, gw->name);
 666                         __mgcp_xmit(gw, cur->buf, cur->len);
 667                 } else {
 668                         if (prev)
 669                                 prev->next = cur->next;
 670                         else
 671                                 gw->msgs = cur->next;
 672
 673                         ast_log(LOG_WARNING, "Maximum retries exceeded for transaction %u on [%s]\n",
 674                                 cur->seqno, gw->name);
 675
 676                         w = cur;
 677
 678                         if (exq) {
 679                                 w->next = exq;
 680                         } else {
 681                                 w->next = NULL;
 682                         }
 683                         exq = w;
 684                 }
 685         }
 686
 687         if (!gw->msgs) {
 688                 gw->retransid = -1;
 689                 res = 0;
 690         } else {
 691                 res = 1;
 692         }
 693         ast_mutex_unlock(&gw->msgs_lock);
 694
 695         while (exq) {
 696                 cur = exq;
 697                 /* time-out transaction */
 698                 handle_response(cur->owner_ep, cur->owner_sub, 406, cur->seqno, NULL);
 699                 exq = exq->next;
 700                 ast_free(cur);
 701         }
 702
 703         return res;
 704 }
 705
 706 /* modified for the new transaction mechanism */
 707 static int mgcp_postrequest(struct mgcp_endpoint *p, struct mgcp_subchannel *sub,
 708                             char *data, int len, unsigned int seqno)
 709 {
 710         struct mgcp_message *msg;
 711         struct mgcp_message *cur;
 712         struct mgcp_gateway *gw;
 713         struct timeval now;
 714
 715         if (!(msg = ast_malloc(sizeof(*msg) + len))) {
 716                 return -1;
 717         }
 718         if (!(gw = ((p && p->parent) ? p->parent : NULL))) {
 719                 ast_free(msg);
 720                 return -1;
 721         }
 722
 723         msg->owner_sub = sub;
 724         msg->owner_ep = p;
 725         msg->seqno = seqno;
 726         msg->next = NULL;
 727         msg->len = len;
 728         msg->retrans = 0;
 729         memcpy(msg->buf, data, msg->len);
 730
 731         ast_mutex_lock(&gw->msgs_lock);
 732         for (cur = gw->msgs; cur && cur->next; cur = cur->next);
 733         if (cur) {
 734                 cur->next = msg;
 735         } else {
 736                 gw->msgs = msg;
 737         }
 738
 739         now = ast_tvnow();
 740         msg->expire = now.tv_sec * 1000 + now.tv_usec / 1000 + DEFAULT_RETRANS;
 741
 742         if (gw->retransid == -1)
 743                 gw->retransid = ast_sched_add(sched, DEFAULT_RETRANS, retrans_pkt, (void *)gw);
 744         ast_mutex_unlock(&gw->msgs_lock);
 745         __mgcp_xmit(gw, msg->buf, msg->len);
 746         /* XXX Should schedule retransmission XXX */
 747         return 0;
 748 }
 749
 750 /* modified for new transport */
 751 static int send_request(struct mgcp_endpoint *p, struct mgcp_subchannel *sub,
 752                         struct mgcp_request *req, unsigned int seqno)
 753 {
 754         int res = 0;
 755         struct mgcp_request **queue, *q, *r, *t;
 756         ast_mutex_t *l;
 757
 758         ast_debug(1, "Slow sequence is %d\n", p->slowsequence);
 759         if (p->slowsequence) {
 760                 queue = &p->cmd_queue;
 761                 l = &p->cmd_queue_lock;
 762                 ast_mutex_lock(l);
 763         } else {
 764                 switch (req->cmd) {
 765                 case MGCP_CMD_DLCX:
 766                         queue = &sub->cx_queue;
 767                         l = &sub->cx_queue_lock;
 768                         ast_mutex_lock(l);
 769                         q = sub->cx_queue;
 770                         /* delete pending cx cmds */
 771                         /* buggy sb5120 */
 772                         if (!sub->parent->ncs) {
 773                                 while (q) {
 774                                         r = q->next;
 775                                         ast_free(q);
 776                                         q = r;
 777                                 }
 778                                 *queue = NULL;
 779                         }
 780                         break;
 781
 782                 case MGCP_CMD_CRCX:
 783                 case MGCP_CMD_MDCX:
 784                         queue = &sub->cx_queue;
 785                         l = &sub->cx_queue_lock;
 786                         ast_mutex_lock(l);
 787                         break;
 788
 789                 case MGCP_CMD_RQNT:
 790                         queue = &p->rqnt_queue;
 791                         l = &p->rqnt_queue_lock;
 792                         ast_mutex_lock(l);
 793                         break;
 794
 795                 default:
 796                         queue = &p->cmd_queue;
 797                         l = &p->cmd_queue_lock;
 798                         ast_mutex_lock(l);
 799                         break;
 800                 }
 801         }
 802
 803         if (!(r = ast_malloc(sizeof(*r)))) {
 804                 ast_log(LOG_WARNING, "Cannot post MGCP request: insufficient memory\n");
 805                 ast_mutex_unlock(l);
 806                 return -1;
 807         }
 808         memcpy(r, req, sizeof(*r));
 809
 810         if (!(*queue)) {
 811                 ast_debug(1, "Posting Request:\n%s to %s:%d\n", req->data,
 812                         ast_inet_ntoa(p->parent->addr.sin_addr), ntohs(p->parent->addr.sin_port));
 813
 814                 res = mgcp_postrequest(p, sub, req->data, req->len, seqno);
 815         } else {
 816                 ast_debug(1, "Queueing Request:\n%s to %s:%d\n", req->data,
 817                         ast_inet_ntoa(p->parent->addr.sin_addr), ntohs(p->parent->addr.sin_port));
 818         }
 819
 820         /* XXX find tail. We could also keep tail in the data struct for faster access */
 821         for (t = *queue; t && t->next; t = t->next);
 822
 823         r->next = NULL;
 824         if (t)
 825                 t->next = r;
 826         else
 827                 *queue = r;
 828
 829         ast_mutex_unlock(l);
 830
 831         return res;
 832 }
 833
 834 static int mgcp_call(struct ast_channel *ast, char *dest, int timeout)
 835 {
 836         int res;
 837         struct mgcp_endpoint *p;
 838         struct mgcp_subchannel *sub;
 839         char tone[50] = "";
 840         const char *distinctive_ring = NULL;
 841         struct varshead *headp;
 842         struct ast_var_t *current;
 843
 844         ast_debug(3, "MGCP mgcp_call(%s)\n", ast->name);
 845         sub = ast->tech_pvt;
 846         p = sub->parent;
 847         headp = &ast->varshead;
 848         AST_LIST_TRAVERSE(headp,current,entries) {
 849                 /* Check whether there is an ALERT_INFO variable */
 850                 if (strcasecmp(ast_var_name(current),"ALERT_INFO") == 0) {
 851                         distinctive_ring = ast_var_value(current);
 852                 }
 853         }
 854
 855         ast_mutex_lock(&sub->lock);
 856         switch (p->hookstate) {
 857         case MGCP_OFFHOOK:
 858                 if (!ast_strlen_zero(distinctive_ring)) {
 859                         snprintf(tone, sizeof(tone), "L/wt%s", distinctive_ring);
 860                         ast_debug(3, "MGCP distinctive callwait %s\n", tone);
 861                 } else {
 862                         ast_copy_string(tone, (p->ncs ? "L/wt1" : "L/wt"), sizeof(tone));
 863                         ast_debug(3, "MGCP normal callwait %s\n", tone);
 864                 }
 865                 break;
 866         case MGCP_ONHOOK:
 867         default:
 868                 if (!ast_strlen_zero(distinctive_ring)) {
 869                         snprintf(tone, sizeof(tone), "L/r%s", distinctive_ring);
 870                         ast_debug(3, "MGCP distinctive ring %s\n", tone);
 871                 } else {
 872                         ast_copy_string(tone, "L/rg", sizeof(tone));
 873                         ast_debug(3, "MGCP default ring\n");
 874                 }
 875                 break;
 876         }
 877
 878         if ((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) {
 879                 ast_log(LOG_WARNING, "mgcp_call called on %s, neither down nor reserved\n", ast->name);
 880                 ast_mutex_unlock(&sub->lock);
 881                 return -1;
 882         }
 883
 884         res = 0;
 885         sub->outgoing = 1;
 886         sub->cxmode = MGCP_CX_RECVONLY;
 887         ast_setstate(ast, AST_STATE_RINGING);
 888         if (p->type == TYPE_LINE) {
 889                 if (!sub->rtp) {
 890                         start_rtp(sub);
 891                 } else {
 892                         transmit_modify_request(sub);
 893                 }
 894
 895                 if (sub->next->owner && !ast_strlen_zero(sub->next->cxident) && !ast_strlen_zero(sub->next->callid)) {
 896                         /* try to prevent a callwait from disturbing the other connection */
 897                         sub->next->cxmode = MGCP_CX_RECVONLY;
 898                         transmit_modify_request(sub->next);
 899                 }
 900
 901                 transmit_notify_request_with_callerid(sub, tone, ast->connected.id.number, ast->connected.id.name);
 902                 ast_setstate(ast, AST_STATE_RINGING);
 903
 904                 if (sub->next->owner && !ast_strlen_zero(sub->next->cxident) && !ast_strlen_zero(sub->next->callid)) {
 905                         /* Put the connection back in sendrecv */
 906                         sub->next->cxmode = MGCP_CX_SENDRECV;
 907                         transmit_modify_request(sub->next);
 908                 }
 909         } else {
 910                 ast_log(LOG_NOTICE, "Don't know how to dial on trunks yet\n");
 911                 res = -1;
 912         }
 913         ast_mutex_unlock(&sub->lock);
 914         return res;
 915 }
 916
 917 static int mgcp_hangup(struct ast_channel *ast)
 918 {
 919         struct mgcp_subchannel *sub = ast->tech_pvt;
 920         struct mgcp_endpoint *p = sub->parent;
 921
 922         ast_debug(1, "mgcp_hangup(%s)\n", ast->name);
 923         if (!ast->tech_pvt) {
 924                 ast_debug(1, "Asked to hangup channel not connected\n");
 925                 return 0;
 926         }
 927         if (strcmp(sub->magic, MGCP_SUBCHANNEL_MAGIC)) {
 928                 ast_debug(1, "Invalid magic. MGCP subchannel freed up already.\n");
 929                 return 0;
 930         }
 931         ast_mutex_lock(&sub->lock);
 932         ast_debug(3, "MGCP mgcp_hangup(%s) on %s@%s\n", ast->name, p->name, p->parent->name);
 933
 934         if ((p->dtmfmode & MGCP_DTMF_INBAND) && p->dsp) {
 935                 /* check whether other channel is active. */
 936                 if (!sub->next->owner) {
 937                         if (p->dtmfmode & MGCP_DTMF_HYBRID) {
 938                                 p->dtmfmode &= ~MGCP_DTMF_INBAND;
 939                         }
 940                         ast_debug(2, "MGCP free dsp on %s@%s\n", p->name, p->parent->name);
 941                         ast_dsp_free(p->dsp);
 942                         p->dsp = NULL;
 943                 }
 944         }
 945
 946         sub->owner = NULL;
 947
 948         /* for deleting gate */
 949         if (p->pktcgatealloc && sub->gate) {
 950                 sub->gate->gate_open = NULL;
 951                 sub->gate->gate_remove = NULL;
 952                 sub->gate->got_dq_gi = NULL;
 953                 sub->gate->tech_pvt = NULL;
 954                 if (sub->gate->state == GATE_ALLOC_PROGRESS || sub->gate->state == GATE_ALLOCATED) {
 955                         ast_pktccops_gate_alloc(GATE_DEL, sub->gate, 0, 0, 0, 0, 0, 0, NULL, NULL);
 956                 } else {
 957                         sub->gate->deltimer = time(NULL) + 5;
 958                 }
 959                 sub->gate = NULL;
 960         }
 961
 962         if (!ast_strlen_zero(sub->cxident)) {
 963                 transmit_connection_del(sub);
 964         }
 965         sub->cxident[0] = '\0';
 966         if ((sub == p->sub) && sub->next->owner) {
 967                 if (p->hookstate == MGCP_OFFHOOK) {
 968                         if (sub->next->owner && ast_bridged_channel(sub->next->owner)) {
 969                                 /* ncs fix! */
 970                                 transmit_notify_request_with_callerid(p->sub, (p->ncs ? "L/wt1" : "L/wt"), ast_bridged_channel(sub->next->owner)->cid.cid_num, ast_bridged_channel(sub->next->owner)->cid.cid_name);
 971                         }
 972                 } else {
 973                         /* set our other connection as the primary and swith over to it */
 974                         p->sub = sub->next;
 975                         p->sub->cxmode = MGCP_CX_RECVONLY;
 976                         transmit_modify_request(p->sub);
 977                         if (sub->next->owner && ast_bridged_channel(sub->next->owner)) {
 978                                 transmit_notify_request_with_callerid(p->sub, "L/rg", ast_bridged_channel(sub->next->owner)->cid.cid_num, ast_bridged_channel(sub->next->owner)->cid.cid_name);
 979                         }
 980                 }
 981
 982         } else if ((sub == p->sub->next) && p->hookstate == MGCP_OFFHOOK) {
 983                 transmit_notify_request(sub, p->ncs ? "" : "L/v");
 984         } else if (p->hookstate == MGCP_OFFHOOK) {
 985                 transmit_notify_request(sub, "L/ro");
 986         } else {
 987                 transmit_notify_request(sub, "");
 988         }
 989
 990         ast->tech_pvt = NULL;
 991         sub->alreadygone = 0;
 992         sub->outgoing = 0;
 993         sub->cxmode = MGCP_CX_INACTIVE;
 994         sub->callid[0] = '\0';
 995         if (p) {
 996                 memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
 997         }
 998         /* Reset temporary destination */
 999         memset(&sub->tmpdest, 0, sizeof(sub->tmpdest));
1000         if (sub->rtp) {
1001                 ast_rtp_instance_destroy(sub->rtp);
1002                 sub->rtp = NULL;
1003         }
1004
1005         ast_module_unref(ast_module_info->self);
1006
1007         if ((p->hookstate == MGCP_ONHOOK) && (!sub->next->rtp)) {
1008                 p->hidecallerid = 0;
1009                 if (p->hascallwaiting && !p->callwaiting) {
1010                         ast_verb(3, "Enabling call waiting on %s\n", ast->name);
1011                         p->callwaiting = -1;
1012                 }
1013                 if (has_voicemail(p)) {
1014                         ast_debug(3, "MGCP mgcp_hangup(%s) on %s@%s set vmwi(+)\n",
1015                                 ast->name, p->name, p->parent->name);
1016                         transmit_notify_request(sub, "L/vmwi(+)");
1017                 } else {
1018                         ast_debug(3, "MGCP mgcp_hangup(%s) on %s@%s set vmwi(-)\n",
1019                                 ast->name, p->name, p->parent->name);
1020                         transmit_notify_request(sub, "L/vmwi(-)");
1021                 }
1022         }
1023         ast_mutex_unlock(&sub->lock);
1024         return 0;
1025 }
1026
1027 static char *handle_mgcp_show_endpoints(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
1028 {
1029         struct mgcp_gateway  *mg;
1030         struct mgcp_endpoint *me;
1031         int hasendpoints = 0;
1032         struct ast_variable * v = NULL;
1033
1034         switch (cmd) {
1035         case CLI_INIT:
1036                 e->command = "mgcp show endpoints";
1037                 e->usage =
1038                         "Usage: mgcp show endpoints\n"
1039                         "       Lists all endpoints known to the MGCP (Media Gateway Control Protocol) subsystem.\n";
1040                 return NULL;
1041         case CLI_GENERATE:
1042                 return NULL;
1043         }
1044
1045         if (a->argc != 3) {
1046                 return CLI_SHOWUSAGE;
1047         }
1048         ast_mutex_lock(&gatelock);
1049         for (mg = gateways; mg; mg = mg->next) {
1050                 ast_cli(a->fd, "Gateway '%s' at %s (%s%s)\n", mg->name, mg->addr.sin_addr.s_addr ? ast_inet_ntoa(mg->addr.sin_addr) : ast_inet_ntoa(mg->defaddr.sin_addr), mg->realtime ? "Realtime, " : "", mg->dynamic ? "Dynamic" : "Static");
1051                 for (me = mg->endpoints; me; me = me->next) {
1052                         ast_cli(a->fd, "   -- '%s@%s in '%s' is %s\n", me->name, mg->name, me->context, me->sub->owner ? "active" : "idle");
1053                         if (me->chanvars) {
1054                                 ast_cli(a->fd, "  Variables:\n");
1055                                 for (v = me->chanvars ; v ; v = v->next) {
1056                                         ast_cli(a->fd, "    %s = '%s'\n", v->name, v->value);
1057                                 }
1058                         }
1059                         hasendpoints = 1;
1060                 }
1061                 if (!hasendpoints) {
1062                         ast_cli(a->fd, "   << No Endpoints Defined >>     ");
1063                 }
1064         }
1065         ast_mutex_unlock(&gatelock);
1066         return CLI_SUCCESS;
1067 }
1068
1069 static char *handle_mgcp_audit_endpoint(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
1070 {
1071         struct mgcp_gateway  *mg;
1072         struct mgcp_endpoint *me;
1073         int found = 0;
1074         char *ename,*gname, *c;
1075
1076         switch (cmd) {
1077         case CLI_INIT:
1078                 e->command = "mgcp audit endpoint";
1079                 e->usage =
1080                         "Usage: mgcp audit endpoint <endpointid>\n"
1081                         "       Lists the capabilities of an endpoint in the MGCP (Media Gateway Control Protocol) subsystem.\n"
1082                         "       mgcp debug MUST be on to see the results of this command.\n";
1083                 return NULL;
1084         case CLI_GENERATE:
1085                 return NULL;
1086         }
1087
1088         if (!mgcpdebug) {
1089                 return CLI_SHOWUSAGE;
1090         }
1091         if (a->argc != 4)
1092                 return CLI_SHOWUSAGE;
1093         /* split the name into parts by null */
1094         ename = ast_strdupa(a->argv[3]);
1095         for (gname = ename; *gname; gname++) {
1096                 if (*gname == '@') {
1097                         *gname = 0;
1098                         gname++;
1099                         break;
1100                 }
1101         }
1102         if (gname[0] == '[') {
1103                 gname++;
1104         }
1105         if ((c = strrchr(gname, ']'))) {
1106                 *c = '\0';
1107         }
1108         ast_mutex_lock(&gatelock);
1109         for (mg = gateways; mg; mg = mg->next) {
1110                 if (!strcasecmp(mg->name, gname)) {
1111                         for (me = mg->endpoints; me; me = me->next) {
1112                                 if (!strcasecmp(me->name, ename)) {
1113                                         found = 1;
1114                                         transmit_audit_endpoint(me);
1115                                         break;
1116                                 }
1117                         }
1118                         if (found) {
1119                                 break;
1120                         }
1121                 }
1122         }
1123         if (!found) {
1124                 ast_cli(a->fd, "   << Could not find endpoint >>     ");
1125         }
1126         ast_mutex_unlock(&gatelock);
1127         return CLI_SUCCESS;
1128 }
1129
1130 static char *handle_mgcp_set_debug(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
1131 {
1132         switch (cmd) {
1133         case CLI_INIT:
1134                 e->command = "mgcp set debug {on|off}";
1135                 e->usage =
1136                         "Usage: mgcp set debug {on|off}\n"
1137                         "       Enables/Disables dumping of MGCP packets for debugging purposes\n";
1138                 return NULL;
1139         case CLI_GENERATE:
1140                 return NULL;
1141         }
1142
1143         if (a->argc != e->args)
1144                 return CLI_SHOWUSAGE;
1145
1146         if (!strncasecmp(a->argv[e->args - 1], "on", 2)) {
1147                 mgcpdebug = 1;
1148                 ast_cli(a->fd, "MGCP Debugging Enabled\n");
1149         } else if (!strncasecmp(a->argv[3], "off", 3)) {
1150                 mgcpdebug = 0;
1151                 ast_cli(a->fd, "MGCP Debugging Disabled\n");
1152         } else {
1153                 return CLI_SHOWUSAGE;
1154         }
1155         return CLI_SUCCESS;
1156 }
1157
1158 static struct ast_cli_entry cli_mgcp[] = {
1159         AST_CLI_DEFINE(handle_mgcp_audit_endpoint, "Audit specified MGCP endpoint"),
1160         AST_CLI_DEFINE(handle_mgcp_show_endpoints, "List defined MGCP endpoints"),
1161         AST_CLI_DEFINE(handle_mgcp_set_debug, "Enable/Disable MGCP debugging"),
1162         AST_CLI_DEFINE(mgcp_reload, "Reload MGCP configuration"),
1163 };
1164
1165 static int mgcp_answer(struct ast_channel *ast)
1166 {
1167         int res = 0;
1168         struct mgcp_subchannel *sub = ast->tech_pvt;
1169         struct mgcp_endpoint *p = sub->parent;
1170
1171         ast_mutex_lock(&sub->lock);
1172         sub->cxmode = MGCP_CX_SENDRECV;
1173         if (!sub->rtp) {
1174                 start_rtp(sub);
1175         } else {
1176                 transmit_modify_request(sub);
1177         }
1178         ast_verb(3, "MGCP mgcp_answer(%s) on %s@%s-%d\n",
1179                         ast->name, p->name, p->parent->name, sub->id);
1180         if (ast->_state != AST_STATE_UP) {
1181                 ast_setstate(ast, AST_STATE_UP);
1182                 ast_debug(1, "mgcp_answer(%s)\n", ast->name);
1183                 transmit_notify_request(sub, "");
1184                 transmit_modify_request(sub);
1185         }
1186         ast_mutex_unlock(&sub->lock);
1187         return res;
1188 }
1189
1190 static struct ast_frame *mgcp_rtp_read(struct mgcp_subchannel *sub)
1191 {
1192         /* Retrieve audio/etc from channel.  Assumes sub->lock is already held. */
1193         struct ast_frame *f;
1194
1195         f = ast_rtp_instance_read(sub->rtp, 0);
1196         /* Don't send RFC2833 if we're not supposed to */
1197         if (f && (f->frametype == AST_FRAME_DTMF) && !(sub->parent->dtmfmode & MGCP_DTMF_RFC2833))
1198                 return &ast_null_frame;
1199         if (sub->owner) {
1200                 /* We already hold the channel lock */
1201                 if (f->frametype == AST_FRAME_VOICE) {
1202                         if (f->subclass.codec != sub->owner->nativeformats) {
1203                                 ast_debug(1, "Oooh, format changed to %s\n", ast_getformatname(f->subclass.codec));
1204                                 sub->owner->nativeformats = f->subclass.codec;
1205                                 ast_set_read_format(sub->owner, sub->owner->readformat);
1206                                 ast_set_write_format(sub->owner, sub->owner->writeformat);
1207                         }
1208                         /* Courtesy fearnor aka alex@pilosoft.com */
1209                         if ((sub->parent->dtmfmode & MGCP_DTMF_INBAND) && (sub->parent->dsp)) {
1210 #if 0
1211                                 ast_log(LOG_NOTICE, "MGCP ast_dsp_process\n");
1212 #endif
1213                                 f = ast_dsp_process(sub->owner, sub->parent->dsp, f);
1214                         }
1215                 }
1216         }
1217         return f;
1218 }
1219
1220
1221 static struct ast_frame *mgcp_read(struct ast_channel *ast)
1222 {
1223         struct ast_frame *f;
1224         struct mgcp_subchannel *sub = ast->tech_pvt;
1225         ast_mutex_lock(&sub->lock);
1226         f = mgcp_rtp_read(sub);
1227         ast_mutex_unlock(&sub->lock);
1228         return f;
1229 }
1230
1231 static int mgcp_write(struct ast_channel *ast, struct ast_frame *frame)
1232 {
1233         struct mgcp_subchannel *sub = ast->tech_pvt;
1234         int res = 0;
1235         char buf[256];
1236
1237         if (frame->frametype != AST_FRAME_VOICE) {
1238                 if (frame->frametype == AST_FRAME_IMAGE)
1239                         return 0;
1240                 else {
1241                         ast_log(LOG_WARNING, "Can't send %d type frames with MGCP write\n", frame->frametype);
1242                         return 0;
1243                 }
1244         } else {
1245                 if (!(frame->subclass.codec & ast->nativeformats)) {
1246                         ast_log(LOG_WARNING, "Asked to transmit frame type %s, while native formats is %s (read/write = %s/%s)\n",
1247                                 ast_getformatname(frame->subclass.codec),
1248                                 ast_getformatname_multiple(buf, sizeof(buf), ast->nativeformats),
1249                                 ast_getformatname(ast->readformat),
1250                                 ast_getformatname(ast->writeformat));
1251                         /* return -1; */
1252                 }
1253         }
1254         if (sub) {
1255                 ast_mutex_lock(&sub->lock);
1256                 if (!sub->sdpsent && sub->gate) {
1257                         if (sub->gate->state == GATE_ALLOCATED) {
1258                                 ast_debug(1, "GATE ALLOCATED, sending sdp\n");
1259                                 transmit_modify_with_sdp(sub, NULL, 0);
1260                         }
1261                 }
1262                 if ((sub->parent->sub == sub) || !sub->parent->singlepath) {
1263                         if (sub->rtp) {
1264                                 res =  ast_rtp_instance_write(sub->rtp, frame);
1265                         }
1266                 }
1267                 ast_mutex_unlock(&sub->lock);
1268         }
1269         return res;
1270 }
1271
1272 static int mgcp_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
1273 {
1274         struct mgcp_subchannel *sub = newchan->tech_pvt;
1275
1276         ast_mutex_lock(&sub->lock);
1277         ast_log(LOG_NOTICE, "mgcp_fixup(%s, %s)\n", oldchan->name, newchan->name);
1278         if (sub->owner != oldchan) {
1279                 ast_mutex_unlock(&sub->lock);
1280                 ast_log(LOG_WARNING, "old channel wasn't %p but was %p\n", oldchan, sub->owner);
1281                 return -1;
1282         }
1283         sub->owner = newchan;
1284         ast_mutex_unlock(&sub->lock);
1285         return 0;
1286 }
1287
1288 static int mgcp_senddigit_begin(struct ast_channel *ast, char digit)
1289 {
1290         struct mgcp_subchannel *sub = ast->tech_pvt;
1291         struct mgcp_endpoint *p = sub->parent;
1292         int res = 0;
1293
1294         ast_mutex_lock(&sub->lock);
1295         if (p->dtmfmode & MGCP_DTMF_INBAND || p->dtmfmode & MGCP_DTMF_HYBRID) {
1296                 ast_debug(1, "Sending DTMF using inband/hybrid\n");
1297                 res = -1; /* Let asterisk play inband indications */
1298         } else if (p->dtmfmode & MGCP_DTMF_RFC2833) {
1299                 ast_debug(1, "Sending DTMF using RFC2833");
1300                 ast_rtp_instance_dtmf_begin(sub->rtp, digit);
1301         } else {
1302                 ast_log(LOG_ERROR, "Don't know about DTMF_MODE %d\n", p->dtmfmode);
1303         }
1304         ast_mutex_unlock(&sub->lock);
1305
1306         return res;
1307 }
1308
1309 static int mgcp_senddigit_end(struct ast_channel *ast, char digit, unsigned int duration)
1310 {
1311         struct mgcp_subchannel *sub = ast->tech_pvt;
1312         struct mgcp_endpoint *p = sub->parent;
1313         int res = 0;
1314         char tmp[4];
1315
1316         ast_mutex_lock(&sub->lock);
1317         if (p->dtmfmode & MGCP_DTMF_INBAND || p->dtmfmode & MGCP_DTMF_HYBRID) {
1318                 ast_debug(1, "Stopping DTMF using inband/hybrid\n");
1319                 res = -1; /* Tell Asterisk to stop inband indications */
1320         } else if (p->dtmfmode & MGCP_DTMF_RFC2833) {
1321                 ast_debug(1, "Stopping DTMF using RFC2833\n");
1322                 if (sub->parent->ncs) {
1323                         tmp[0] = digit;
1324                         tmp[1] = '\0';
1325                 } else {
1326                         tmp[0] = 'D';
1327                         tmp[1] = '/';
1328                         tmp[2] = digit;
1329                         tmp[3] = '\0';
1330                 }
1331                 transmit_notify_request(sub, tmp);
1332                 ast_rtp_instance_dtmf_end(sub->rtp, digit);
1333         } else {
1334                 ast_log(LOG_ERROR, "Don't know about DTMF_MODE %d\n", p->dtmfmode);
1335         }
1336         ast_mutex_unlock(&sub->lock);
1337
1338         return res;
1339 }
1340
1341 /*!
1342  *  \brief  mgcp_devicestate: channel callback for device status monitoring
1343  *  \param  data tech/resource name of MGCP device to query
1344  *
1345  * Callback for device state management in channel subsystem
1346  * to obtain device status (up/down) of a specific MGCP endpoint
1347  *
1348  *  \return device status result (from devicestate.h) AST_DEVICE_INVALID (not available) or AST_DEVICE_UNKNOWN (available but unknown state)
1349  */
1350 static int mgcp_devicestate(void *data)
1351 {
1352         struct mgcp_gateway  *g;
1353         struct mgcp_endpoint *e = NULL;
1354         char *tmp, *endpt, *gw;
1355         int ret = AST_DEVICE_INVALID;
1356
1357         endpt = ast_strdupa(data);
1358         if ((tmp = strchr(endpt, '@'))) {
1359                 *tmp++ = '\0';
1360                 gw = tmp;
1361         } else
1362                 goto error;
1363
1364         ast_mutex_lock(&gatelock);
1365         for (g = gateways; g; g = g->next) {
1366                 if (strcasecmp(g->name, gw) == 0) {
1367                         e = g->endpoints;
1368                         break;
1369                 }
1370         }
1371
1372         if (!e)
1373                 goto error;
1374
1375         for (; e; e = e->next) {
1376                 if (strcasecmp(e->name, endpt) == 0) {
1377                         break;
1378                 }
1379         }
1380
1381         if (!e)
1382                 goto error;
1383
1384         /*
1385          * As long as the gateway/endpoint is valid, we'll
1386          * assume that the device is available and its state
1387          * can be tracked.
1388          */
1389         ret = AST_DEVICE_UNKNOWN;
1390
1391 error:
1392         ast_mutex_unlock(&gatelock);
1393         return ret;
1394 }
1395
1396 static char *control2str(int ind) {
1397         switch (ind) {
1398         case AST_CONTROL_HANGUP:
1399                 return "Other end has hungup";
1400         case AST_CONTROL_RING:
1401                 return "Local ring";
1402         case AST_CONTROL_RINGING:
1403                 return "Remote end is ringing";
1404         case AST_CONTROL_ANSWER:
1405                 return "Remote end has answered";
1406         case AST_CONTROL_BUSY:
1407                 return "Remote end is busy";
1408         case AST_CONTROL_TAKEOFFHOOK:
1409                 return "Make it go off hook";
1410         case AST_CONTROL_OFFHOOK:
1411                 return "Line is off hook";
1412         case AST_CONTROL_CONGESTION:
1413                 return "Congestion (circuits busy)";
1414         case AST_CONTROL_FLASH:
1415                 return "Flash hook";
1416         case AST_CONTROL_WINK:
1417                 return "Wink";
1418         case AST_CONTROL_OPTION:
1419                 return "Set a low-level option";
1420         case AST_CONTROL_RADIO_KEY:
1421                 return "Key Radio";
1422         case AST_CONTROL_RADIO_UNKEY:
1423                 return "Un-Key Radio";
1424         }
1425         return "UNKNOWN";
1426 }
1427
1428 static int mgcp_indicate(struct ast_channel *ast, int ind, const void *data, size_t datalen)
1429 {
1430         struct mgcp_subchannel *sub = ast->tech_pvt;
1431         int res = 0;
1432
1433         ast_debug(3, "MGCP asked to indicate %d '%s' condition on channel %s\n",
1434                 ind, control2str(ind), ast->name);
1435         ast_mutex_lock(&sub->lock);
1436         switch(ind) {
1437         case AST_CONTROL_RINGING:
1438 #ifdef DLINK_BUGGY_FIRMWARE
1439                 transmit_notify_request(sub, "rt");
1440 #else
1441                 if (!sub->sdpsent) { /* will hide the inband progress!!! */
1442                         transmit_notify_request(sub, sub->parent->ncs ? "L/rt" : "G/rt");
1443                 }
1444 #endif
1445                 break;
1446         case AST_CONTROL_BUSY:
1447                 transmit_notify_request(sub, "L/bz");
1448                 break;
1449         case AST_CONTROL_CONGESTION:
1450                 transmit_notify_request(sub, sub->parent->ncs ? "L/cg" : "G/cg");
1451                 break;
1452         case AST_CONTROL_HOLD:
1453                 ast_moh_start(ast, data, NULL);
1454                 break;
1455         case AST_CONTROL_UNHOLD:
1456                 ast_moh_stop(ast);
1457                 break;
1458         case AST_CONTROL_SRCUPDATE:
1459                 ast_rtp_instance_update_source(sub->rtp);
1460                 break;
1461         case AST_CONTROL_SRCCHANGE:
1462                 ast_rtp_instance_change_source(sub->rtp);
1463                 break;
1464         case AST_CONTROL_PROGRESS:
1465         case AST_CONTROL_PROCEEDING:
1466                 transmit_modify_request(sub);
1467         case -1:
1468                 transmit_notify_request(sub, "");
1469                 break;
1470         default:
1471                 ast_log(LOG_WARNING, "Don't know how to indicate condition %d\n", ind);
1472                 res = -1;
1473         }
1474         ast_mutex_unlock(&sub->lock);
1475         return res;
1476 }
1477
1478 static struct ast_channel *mgcp_new(struct mgcp_subchannel *sub, int state, const char *linkedid)
1479 {
1480         struct ast_channel *tmp;
1481         struct ast_variable *v = NULL;
1482         struct mgcp_endpoint *i = sub->parent;
1483         int fmt;
1484
1485         tmp = ast_channel_alloc(1, state, i->cid_num, i->cid_name, linkedid, i->accountcode, i->exten, i->context, i->amaflags, "MGCP/%s@%s-%d", i->name, i->parent->name, sub->id);
1486         if (tmp) {
1487                 tmp->tech = &mgcp_tech;
1488                 tmp->nativeformats = i->capability;
1489                 if (!tmp->nativeformats) {
1490                         tmp->nativeformats = capability;
1491                 }
1492                 fmt = ast_best_codec(tmp->nativeformats);
1493                 if (sub->rtp) {
1494                         ast_channel_set_fd(tmp, 0, ast_rtp_instance_fd(sub->rtp, 0));
1495                 }
1496                 if (i->dtmfmode & (MGCP_DTMF_INBAND | MGCP_DTMF_HYBRID)) {
1497                         i->dsp = ast_dsp_new();
1498                         ast_dsp_set_features(i->dsp, DSP_FEATURE_DIGIT_DETECT);
1499                         /* this is to prevent clipping of dtmf tones during dsp processing */
1500                         ast_dsp_set_digitmode(i->dsp, DSP_DIGITMODE_NOQUELCH);
1501                 } else {
1502                         i->dsp = NULL;
1503                 }
1504                 if (state == AST_STATE_RING)
1505                         tmp->rings = 1;
1506                 tmp->writeformat = fmt;
1507                 tmp->rawwriteformat = fmt;
1508                 tmp->readformat = fmt;
1509                 tmp->rawreadformat = fmt;
1510                 tmp->tech_pvt = sub;
1511                 if (!ast_strlen_zero(i->language))
1512                         ast_string_field_set(tmp, language, i->language);
1513                 if (!ast_strlen_zero(i->accountcode))
1514                         ast_string_field_set(tmp, accountcode, i->accountcode);
1515                 if (i->amaflags)
1516                         tmp->amaflags = i->amaflags;
1517                 sub->owner = tmp;
1518                 ast_module_ref(ast_module_info->self);
1519                 tmp->callgroup = i->callgroup;
1520                 tmp->pickupgroup = i->pickupgroup;
1521                 ast_string_field_set(tmp, call_forward, i->call_forward);
1522                 ast_copy_string(tmp->context, i->context, sizeof(tmp->context));
1523                 ast_copy_string(tmp->exten, i->exten, sizeof(tmp->exten));
1524
1525                 /* Don't use ast_set_callerid() here because it will
1526                  * generate a needless NewCallerID event */
1527                 tmp->cid.cid_ani = ast_strdup(i->cid_num);
1528
1529                 if (!i->adsi) {
1530                         tmp->adsicpe = AST_ADSI_UNAVAILABLE;
1531                 }
1532                 tmp->priority = 1;
1533
1534                 /* Set channel variables for this call from configuration */
1535                 for (v = i->chanvars ; v ; v = v->next) {
1536                         char valuebuf[1024];
1537                         pbx_builtin_setvar_helper(tmp, v->name, ast_get_encoded_str(v->value, valuebuf, sizeof(valuebuf)));
1538                 }
1539
1540                 if (sub->rtp) {
1541                         ast_jb_configure(tmp, &global_jbconf);
1542                 }
1543                 if (state != AST_STATE_DOWN) {
1544                         if (ast_pbx_start(tmp)) {
1545                                 ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
1546                                 ast_hangup(tmp);
1547                                 tmp = NULL;
1548                         }
1549                 }
1550                 ast_verb(3, "MGCP mgcp_new(%s) created in state: %s\n",
1551                                 tmp->name, ast_state2str(state));
1552         } else {
1553                 ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
1554         }
1555         return tmp;
1556 }
1557
1558 static char *get_sdp_by_line(char* line, char *name, int nameLen)
1559 {
1560         if (strncasecmp(line, name, nameLen) == 0 && line[nameLen] == '=') {
1561                 char *r = line + nameLen + 1;
1562                 while (*r && (*r < 33)) ++r;
1563                 return r;
1564         }
1565         return "";
1566 }
1567
1568 static char *get_sdp(struct mgcp_request *req, char *name)
1569 {
1570         int x;
1571         int len = strlen(name);
1572         char *r;
1573
1574         for (x = 0; x < req->lines; x++) {
1575                 r = get_sdp_by_line(req->line[x], name, len);
1576                 if (r[0] != '\0') return r;
1577         }
1578         return "";
1579 }
1580
1581 static void sdpLineNum_iterator_init(int *iterator)
1582 {
1583         *iterator = 0;
1584 }
1585
1586 static char *get_sdp_iterate(int* iterator, struct mgcp_request *req, char *name)
1587 {
1588         int len = strlen(name);
1589         char *r;
1590         while (*iterator < req->lines) {
1591                 r = get_sdp_by_line(req->line[(*iterator)++], name, len);
1592                 if (r[0] != '\0') return r;
1593         }
1594         return "";
1595 }
1596
1597 static char *__get_header(struct mgcp_request *req, char *name, int *start, char *def)
1598 {
1599         int x;
1600         int len = strlen(name);
1601         char *r;
1602         for (x = *start; x < req->headers; x++) {
1603                 if (!strncasecmp(req->header[x], name, len) &&
1604                     (req->header[x][len] == ':')) {
1605                         r = req->header[x] + len + 1;
1606                         while (*r && (*r < 33)) {
1607                                 r++;
1608                         }
1609                         *start = x + 1;
1610                         return r;
1611                 }
1612         }
1613         /* Don't return NULL, so get_header is always a valid pointer */
1614         return def;
1615 }
1616
1617 static char *get_header(struct mgcp_request *req, char *name)
1618 {
1619         int start = 0;
1620         return __get_header(req, name, &start, "");
1621 }
1622
1623 /*! \brief get_csv: (SC:) get comma separated value */
1624 static char *get_csv(char *c, int *len, char **next)
1625 {
1626         char *s;
1627
1628         *next = NULL, *len = 0;
1629         if (!c) return NULL;
1630
1631         while (*c && (*c < 33 || *c == ',')) {
1632                 c++;
1633         }
1634
1635         s = c;
1636         while (*c && (*c >= 33 && *c != ',')) {
1637                 c++, (*len)++;
1638         }
1639         *next = c;
1640
1641         if (*len == 0) {
1642                 s = NULL, *next = NULL;
1643         }
1644
1645         return s;
1646 }
1647
1648 static struct mgcp_gateway *find_realtime_gw(char *name, char *at, struct sockaddr_in *sin)
1649 {
1650         struct mgcp_gateway *g = NULL;
1651         struct ast_variable *mgcpgwconfig = NULL;
1652         struct ast_variable *mgcpepconfig = NULL;
1653         struct ast_variable *gwv, *epname = NULL;
1654         struct mgcp_endpoint *e;
1655         char *c = NULL, *line;
1656         char lines[256];
1657         int i, j;
1658
1659         ast_debug(1, "*** find Realtime MGCPGW\n");
1660
1661         if (!(i = ast_check_realtime("mgcpgw")) || !(j = ast_check_realtime("mgcpep"))) {
1662                 return NULL;
1663         }
1664
1665         if (ast_strlen_zero(at)) {
1666                 ast_debug(1, "null gw name\n");
1667                 return NULL;
1668         }
1669
1670         if (!(mgcpgwconfig = ast_load_realtime("mgcpgw", "name", at, NULL))) {
1671                 return NULL;
1672         }
1673
1674         /*!
1675          * \note This is a fairly odd way of instantiating lines.  Instead of each
1676          * line created by virtue of being in the database (and loaded via
1677          * ast_load_realtime_multientry), this code forces a specific order with a
1678          * "lines" entry in the "mgcpgw" record.  This has benefits, because as with
1679          * chan_dahdi, values are inherited across definitions.  The downside is
1680          * that it's not as clear what the values will be simply by looking at a
1681          * single row in the database, and it's probable that the sanest configuration
1682          * should have the first column in the "mgcpep" table be "clearvars", with a
1683          * static value of "all", if any variables are set at all.  It may be worth
1684          * making this assumption explicit in the code in the future, and then just
1685          * using ast_load_realtime_multientry for the "mgcpep" records.
1686          */
1687         lines[0] = '\0';
1688         for (gwv = mgcpgwconfig; gwv; gwv = gwv->next) {
1689                 if (!strcasecmp(gwv->name, "lines")) {
1690                         ast_copy_string(lines, gwv->value, sizeof(lines));
1691                         break;
1692                 }
1693         }
1694         /* Position gwv at the end of the list */
1695         for (gwv = gwv && gwv->next ? gwv : mgcpgwconfig; gwv->next; gwv = gwv->next);
1696
1697         if (!ast_strlen_zero(lines)) {
1698                 AST_DECLARE_APP_ARGS(args,
1699                         AST_APP_ARG(line)[100];
1700                 );
1701                 AST_STANDARD_APP_ARGS(args, lines);
1702                 for (i = 0; i < args.argc; i++) {
1703                         gwv->next = ast_load_realtime("mgcpep", "name", at, "line", args.line[i], NULL);
1704
1705                         /* Remove "line" AND position gwv at the end of the list. */
1706                         for (epname = NULL; gwv->next; gwv = gwv->next) {
1707                                 if (!strcasecmp(gwv->next->name, "line")) {
1708                                         /* Remove it from the list */
1709                                         epname = gwv->next;
1710                                         gwv->next = gwv->next->next;
1711                                 }
1712                         }
1713                         /* Since "line" instantiates the configuration, we have to move it to the end. */
1714                         if (epname) {
1715                                 gwv->next = epname;
1716                                 epname->next = NULL;
1717                                 gwv = gwv->next;
1718                         }
1719                 }
1720         }
1721         for (gwv = mgcpgwconfig; gwv; gwv = gwv->next) {
1722                 ast_debug(1, "MGCP Realtime var: %s => %s\n", gwv->name, gwv->value);
1723         }
1724
1725         if (mgcpgwconfig) {
1726                 g = build_gateway(at, mgcpgwconfig);
1727                 ast_variables_destroy(mgcpgwconfig);
1728         }
1729         if (g) {
1730                 g->next = gateways;
1731                 g->realtime = 1;
1732                 gateways = g;
1733                 for (e = g->endpoints; e; e = e->next) {
1734                         transmit_audit_endpoint(e);
1735                         e->needaudit = 0;
1736                 }
1737         }
1738         return g;
1739 }
1740
1741 static struct mgcp_subchannel *find_subchannel_and_lock(char *name, int msgid, struct sockaddr_in *sin)
1742 {
1743         struct mgcp_endpoint *p = NULL;
1744         struct mgcp_subchannel *sub = NULL;
1745         struct mgcp_gateway *g;
1746         char tmp[256] = "";
1747         char *at = NULL, *c;
1748         int found = 0;
1749         if (name) {
1750                 ast_copy_string(tmp, name, sizeof(tmp));
1751                 at = strchr(tmp, '@');
1752                 if (!at) {
1753                         ast_log(LOG_NOTICE, "Endpoint '%s' has no at sign!\n", name);
1754                         return NULL;
1755                 }
1756                 *at++ = '\0';
1757         }
1758         ast_mutex_lock(&gatelock);
1759         if (at && (at[0] == '[')) {
1760                 at++;
1761                 c = strrchr(at, ']');
1762                 if (c) {
1763                         *c = '\0';
1764                 }
1765         }
1766         for (g = gateways ? gateways : find_realtime_gw(name, at, sin); g; g = g->next ? g->next : find_realtime_gw(name, at, sin)) {
1767                 if ((!name || !strcasecmp(g->name, at)) &&
1768                     (sin || g->addr.sin_addr.s_addr || g->defaddr.sin_addr.s_addr)) {
1769                         /* Found the gateway.  If it's dynamic, save it's address -- now for the endpoint */
1770                         if (sin && g->dynamic && name) {
1771                                 if ((g->addr.sin_addr.s_addr != sin->sin_addr.s_addr) ||
1772                                         (g->addr.sin_port != sin->sin_port)) {
1773                                         memcpy(&g->addr, sin, sizeof(g->addr));
1774                                         if (ast_ouraddrfor(&g->addr.sin_addr, &g->ourip))
1775                                                 memcpy(&g->ourip, &__ourip, sizeof(g->ourip));
1776                                         ast_verb(3, "Registered MGCP gateway '%s' at %s port %d\n", g->name, ast_inet_ntoa(g->addr.sin_addr), ntohs(g->addr.sin_port));
1777                                 }
1778                         /* not dynamic, check if the name matches */
1779                         } else if (name) {
1780                                 if (strcasecmp(g->name, at)) {
1781                                         g = g->next;
1782                                         continue;
1783                                 }
1784                         /* not dynamic, no name, check if the addr matches */
1785                         } else if (!name && sin) {
1786                                 if ((g->addr.sin_addr.s_addr != sin->sin_addr.s_addr) ||
1787                                     (g->addr.sin_port != sin->sin_port)) {
1788                                         if(!g->next)
1789                                                 g = find_realtime_gw(name, at, sin);
1790                                         else
1791                                                 g = g->next;
1792                                         continue;
1793                                 }
1794                         } else {
1795                                 continue;
1796                         }
1797                         for (p = g->endpoints; p; p = p->next) {
1798                                 ast_debug(1, "Searching on %s@%s for subchannel\n", p->name, g->name);
1799                                 if (msgid) {
1800                                         sub = p->sub;
1801                                         found = 1;
1802                                         break;
1803                                 } else if (name && !strcasecmp(p->name, tmp)) {
1804                                         ast_debug(1, "Coundn't determine subchannel, assuming current master %s@%s-%d\n",
1805                                                 p->name, g->name, p->sub->id);
1806                                         sub = p->sub;
1807                                         found = 1;
1808                                         break;
1809                                 }
1810                         }
1811                         if (sub && found) {
1812                                 ast_mutex_lock(&sub->lock);
1813                                 break;
1814                         }
1815                 }
1816         }
1817         ast_mutex_unlock(&gatelock);
1818         if (!sub) {
1819                 if (name) {
1820                         if (g) {
1821                                 ast_log(LOG_NOTICE, "Endpoint '%s' not found on gateway '%s'\n", tmp, at);
1822                         } else {
1823                                 ast_log(LOG_NOTICE, "Gateway '%s' (and thus its endpoint '%s') does not exist\n", at, tmp);
1824                         }
1825                 }
1826         }
1827         return sub;
1828 }
1829
1830 static void parse(struct mgcp_request *req)
1831 {
1832         /* Divide fields by NULL's */
1833         char *c;
1834         int f = 0;
1835         c = req->data;
1836
1837         /* First header starts immediately */
1838         req->header[f] = c;
1839         for (; *c; c++) {
1840                 if (*c == '\n') {
1841                         /* We've got a new header */
1842                         *c = 0;
1843                         ast_debug(3, "Header: %s (%d)\n", req->header[f], (int) strlen(req->header[f]));
1844                         if (ast_strlen_zero(req->header[f])) {
1845                                 /* Line by itself means we're now in content */
1846                                 c++;
1847                                 break;
1848                         }
1849                         if (f >= MGCP_MAX_HEADERS - 1) {
1850                                 ast_log(LOG_WARNING, "Too many MGCP headers...\n");
1851                         } else {
1852                                 f++;
1853                         }
1854                         req->header[f] = c + 1;
1855                 } else if (*c == '\r') {
1856                         /* Ignore but eliminate \r's */
1857                         *c = 0;
1858                 }
1859         }
1860         /* Check for last header */
1861         if (!ast_strlen_zero(req->header[f])) {
1862                 f++;
1863         }
1864         req->headers = f;
1865         /* Now we process any mime content */
1866         f = 0;
1867         req->line[f] = c;
1868         for (; *c; c++) {
1869                 if (*c == '\n') {
1870                         /* We've got a new line */
1871                         *c = 0;
1872                         ast_debug(3, "Line: %s (%d)\n", req->line[f], (int) strlen(req->line[f]));
1873                         if (f >= MGCP_MAX_LINES - 1) {
1874                                 ast_log(LOG_WARNING, "Too many SDP lines...\n");
1875                         } else {
1876                                 f++;
1877                         }
1878                         req->line[f] = c + 1;
1879                 } else if (*c == '\r') {
1880                         /* Ignore and eliminate \r's */
1881                         *c = 0;
1882                 }
1883         }
1884         /* Check for last line */
1885         if (!ast_strlen_zero(req->line[f])) {
1886                 f++;
1887         }
1888         req->lines = f;
1889         /* Parse up the initial header */
1890         c = req->header[0];
1891         while (*c && *c < 33) c++;
1892         /* First the verb */
1893         req->verb = c;
1894         while (*c && (*c > 32)) c++;
1895         if (*c) {
1896                 *c = '\0';
1897                 c++;
1898                 while (*c && (*c < 33)) c++;
1899                 req->identifier = c;
1900                 while (*c && (*c > 32)) c++;
1901                 if (*c) {
1902                         *c = '\0';
1903                         c++;
1904                         while (*c && (*c < 33)) c++;
1905                         req->endpoint = c;
1906                         while (*c && (*c > 32)) c++;
1907                         if (*c) {
1908                                 *c = '\0';
1909                                 c++;
1910                                 while (*c && (*c < 33)) c++;
1911                                 req->version = c;
1912                                 while (*c && (*c > 32)) c++;
1913                                 while (*c && (*c < 33)) c++;
1914                                 while (*c && (*c > 32)) c++;
1915                                 *c = '\0';
1916                         }
1917                 }
1918         }
1919
1920         ast_debug(1, "Verb: '%s', Identifier: '%s', Endpoint: '%s', Version: '%s'\n",
1921                         req->verb, req->identifier, req->endpoint, req->version);
1922         ast_debug(1, "%d headers, %d lines\n", req->headers, req->lines);
1923         if (*c) {
1924                 ast_log(LOG_WARNING, "Odd content, extra stuff left over ('%s')\n", c);
1925         }
1926 }
1927
1928 static int process_sdp(struct mgcp_subchannel *sub, struct mgcp_request *req)
1929 {
1930         char *m;
1931         char *c;
1932         char *a;
1933         char host[258];
1934         int len;
1935         int portno;
1936         format_t peercapability;
1937         int peerNonCodecCapability;
1938         struct sockaddr_in sin;
1939         char *codecs;
1940         struct ast_hostent ahp; struct hostent *hp;
1941         int codec, codec_count=0;
1942         int iterator;
1943         struct mgcp_endpoint *p = sub->parent;
1944         char tmp1[256], tmp2[256], tmp3[256];
1945
1946         /* Get codec and RTP info from SDP */
1947         m = get_sdp(req, "m");
1948         c = get_sdp(req, "c");
1949         if (ast_strlen_zero(m) || ast_strlen_zero(c)) {
1950                 ast_log(LOG_WARNING, "Insufficient information for SDP (m = '%s', c = '%s')\n", m, c);
1951                 return -1;
1952         }
1953         if (sscanf(c, "IN IP4 %256s", host) != 1) {
1954                 ast_log(LOG_WARNING, "Invalid host in c= line, '%s'\n", c);
1955                 return -1;
1956         }
1957         /* XXX This could block for a long time, and block the main thread! XXX */
1958         hp = ast_gethostbyname(host, &ahp);
1959         if (!hp) {
1960                 ast_log(LOG_WARNING, "Unable to lookup host in c= line, '%s'\n", c);
1961                 return -1;
1962         }
1963         if (sscanf(m, "audio %30d RTP/AVP %n", &portno, &len) != 1) {
1964                 ast_log(LOG_WARNING, "Unable to determine port number for RTP in '%s'\n", m);
1965                 return -1;
1966         }
1967         sin.sin_family = AF_INET;
1968         memcpy(&sin.sin_addr, hp->h_addr, sizeof(sin.sin_addr));
1969         sin.sin_port = htons(portno);
1970         ast_rtp_instance_set_remote_address(sub->rtp, &sin);
1971         ast_debug(3, "Peer RTP is at port %s:%d\n", ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
1972         /* Scan through the RTP payload types specified in a "m=" line: */
1973         ast_rtp_codecs_payloads_clear(ast_rtp_instance_get_codecs(sub->rtp), sub->rtp);
1974         codecs = ast_strdupa(m + len);
1975         while (!ast_strlen_zero(codecs)) {
1976                 if (sscanf(codecs, "%30d%n", &codec, &len) != 1) {
1977                         if (codec_count) {
1978                                 break;
1979                         }
1980                         ast_log(LOG_WARNING, "Error in codec string '%s' at '%s'\n", m, codecs);
1981                         return -1;
1982                 }
1983                 ast_rtp_codecs_payloads_set_m_type(ast_rtp_instance_get_codecs(sub->rtp), sub->rtp, codec);
1984                 codec_count++;
1985                 codecs += len;
1986         }
1987
1988         /* Next, scan through each "a=rtpmap:" line, noting each */
1989         /* specified RTP payload type (with corresponding MIME subtype): */
1990         sdpLineNum_iterator_init(&iterator);
1991         while ((a = get_sdp_iterate(&iterator, req, "a"))[0] != '\0') {
1992                 char* mimeSubtype = ast_strdupa(a); /* ensures we have enough space */
1993                 if (sscanf(a, "rtpmap: %30u %127[^/]/", &codec, mimeSubtype) != 2)
1994                         continue;
1995                 /* Note: should really look at the 'freq' and '#chans' params too */
1996                 ast_rtp_codecs_payloads_set_rtpmap_type(ast_rtp_instance_get_codecs(sub->rtp), sub->rtp, codec, "audio", mimeSubtype, 0);
1997         }
1998
1999         /* Now gather all of the codecs that were asked for: */
2000         ast_rtp_codecs_payload_formats(ast_rtp_instance_get_codecs(sub->rtp), &peercapability, &peerNonCodecCapability);
2001         p->capability = capability & peercapability;
2002         ast_debug(1, "Capabilities: us - %s, them - %s, combined - %s\n",
2003                 ast_getformatname_multiple(tmp1, sizeof(tmp1), capability),
2004                 ast_getformatname_multiple(tmp2, sizeof(tmp2), peercapability),
2005                 ast_getformatname_multiple(tmp3, sizeof(tmp3), p->capability));
2006         ast_debug(1, "Non-codec capabilities: us - %d, them - %d, combined - %d\n",
2007                 nonCodecCapability, peerNonCodecCapability, p->nonCodecCapability);
2008         if (!p->capability) {
2009                 ast_log(LOG_WARNING, "No compatible codecs!\n");
2010                 return -1;
2011         }
2012         return 0;
2013 }
2014
2015 static int add_header(struct mgcp_request *req, const char *var, const char *value)
2016 {
2017         if (req->len >= sizeof(req->data) - 4) {
2018                 ast_log(LOG_WARNING, "Out of space, can't add anymore\n");
2019                 return -1;
2020         }
2021         if (req->lines) {
2022                 ast_log(LOG_WARNING, "Can't add more headers when lines have been added\n");
2023                 return -1;
2024         }
2025         req->header[req->headers] = req->data + req->len;
2026         snprintf(req->header[req->headers], sizeof(req->data) - req->len, "%s: %s\r\n", var, value);
2027         req->len += strlen(req->header[req->headers]);
2028         if (req->headers < MGCP_MAX_HEADERS) {
2029                 req->headers++;
2030         } else {
2031                 ast_log(LOG_WARNING, "Out of header space\n");
2032                 return -1;
2033         }
2034         return 0;
2035 }
2036
2037 static int add_line(struct mgcp_request *req, char *line)
2038 {
2039         if (req->len >= sizeof(req->data) - 4) {
2040                 ast_log(LOG_WARNING, "Out of space, can't add anymore\n");
2041                 return -1;
2042         }
2043         if (!req->lines) {
2044                 /* Add extra empty return */
2045                 ast_copy_string(req->data + req->len, "\r\n", sizeof(req->data) - req->len);
2046                 req->len += strlen(req->data + req->len);
2047         }
2048         req->line[req->lines] = req->data + req->len;
2049         snprintf(req->line[req->lines], sizeof(req->data) - req->len, "%s", line);
2050         req->len += strlen(req->line[req->lines]);
2051         if (req->lines < MGCP_MAX_LINES) {
2052                 req->lines++;
2053         } else {
2054                 ast_log(LOG_WARNING, "Out of line space\n");
2055                 return -1;
2056         }
2057         return 0;
2058 }
2059
2060 static int init_resp(struct mgcp_request *req, char *resp, struct mgcp_request *orig, char *resprest)
2061 {
2062         /* Initialize a response */
2063         if (req->headers || req->len) {
2064                 ast_log(LOG_WARNING, "Request already initialized?!?\n");
2065                 return -1;
2066         }
2067         req->header[req->headers] = req->data + req->len;
2068         snprintf(req->header[req->headers], sizeof(req->data) - req->len, "%s %s %s\r\n", resp, orig->identifier, resprest);
2069         req->len += strlen(req->header[req->headers]);
2070         if (req->headers < MGCP_MAX_HEADERS) {
2071                 req->headers++;
2072         } else {
2073                 ast_log(LOG_WARNING, "Out of header space\n");
2074         }
2075         return 0;
2076 }
2077
2078 static int init_req(struct mgcp_endpoint *p, struct mgcp_request *req, char *verb)
2079 {
2080         /* Initialize a response */
2081         if (req->headers || req->len) {
2082                 ast_log(LOG_WARNING, "Request already initialized?!?\n");
2083                 return -1;
2084         }
2085         req->header[req->headers] = req->data + req->len;
2086         /* check if we need brackets around the gw name */
2087         if (p->parent->isnamedottedip) {
2088                 snprintf(req->header[req->headers], sizeof(req->data) - req->len, "%s %d %s@[%s] MGCP 1.0%s\r\n", verb, oseq, p->name, p->parent->name, p->ncs ? " NCS 1.0" : "");
2089         } else {
2090 +               snprintf(req->header[req->headers], sizeof(req->data) - req->len, "%s %d %s@%s MGCP 1.0%s\r\n", verb, oseq, p->name, p->parent->name, p->ncs ? " NCS 1.0" : "");
2091         }
2092         req->len += strlen(req->header[req->headers]);
2093         if (req->headers < MGCP_MAX_HEADERS) {
2094                 req->headers++;
2095         } else {
2096                 ast_log(LOG_WARNING, "Out of header space\n");
2097         }
2098         return 0;
2099 }
2100
2101
2102 static int respprep(struct mgcp_request *resp, struct mgcp_endpoint *p, char *msg, struct mgcp_request *req, char *msgrest)
2103 {
2104         memset(resp, 0, sizeof(*resp));
2105         init_resp(resp, msg, req, msgrest);
2106         return 0;
2107 }
2108
2109 static int reqprep(struct mgcp_request *req, struct mgcp_endpoint *p, char *verb)
2110 {
2111         memset(req, 0, sizeof(struct mgcp_request));
2112         oseq++;
2113         if (oseq > 999999999) {
2114                 oseq = 1;
2115         }
2116         init_req(p, req, verb);
2117         return 0;
2118 }
2119
2120 static int transmit_response(struct mgcp_subchannel *sub, char *msg, struct mgcp_request *req, char *msgrest)
2121 {
2122         struct mgcp_request resp;
2123         struct mgcp_endpoint *p = sub->parent;
2124         struct mgcp_response *mgr;
2125
2126         if (!sub) {
2127                 return -1;
2128         }
2129
2130         respprep(&resp, p, msg, req, msgrest);
2131         if (!(mgr = ast_calloc(1, sizeof(*mgr) + resp.len + 1))) {
2132                 return send_response(sub, &resp);
2133         }
2134         /* Store MGCP response in case we have to retransmit */
2135         sscanf(req->identifier, "%30d", &mgr->seqno);
2136         time(&mgr->whensent);
2137         mgr->len = resp.len;
2138         memcpy(mgr->buf, resp.data, resp.len);
2139         mgr->buf[resp.len] = '\0';
2140         mgr->next = p->parent->responses;
2141         p->parent->responses = mgr;
2142
2143         return send_response(sub, &resp);
2144 }
2145
2146
2147 static int add_sdp(struct mgcp_request *resp, struct mgcp_subchannel *sub, struct ast_rtp_instance *rtp)
2148 {
2149         int len;
2150         int codec;
2151         char costr[80];
2152         struct sockaddr_in sin;
2153         char v[256];
2154         char s[256];
2155         char o[256];
2156         char c[256];
2157         char t[256];
2158         char m[256] = "";
2159         char a[1024] = "";
2160         format_t x;
2161         struct sockaddr_in dest = { 0, };
2162         struct mgcp_endpoint *p = sub->parent;
2163         /* XXX We break with the "recommendation" and send our IP, in order that our
2164                peer doesn't have to ast_gethostbyname() us XXX */
2165         len = 0;
2166         if (!sub->rtp) {
2167                 ast_log(LOG_WARNING, "No way to add SDP without an RTP structure\n");
2168                 return -1;
2169         }
2170         ast_rtp_instance_get_local_address(sub->rtp, &sin);
2171         if (rtp) {
2172                 ast_rtp_instance_get_remote_address(sub->rtp, &dest);
2173         } else {
2174                 if (sub->tmpdest.sin_addr.s_addr) {
2175                         dest.sin_addr = sub->tmpdest.sin_addr;
2176                         dest.sin_port = sub->tmpdest.sin_port;
2177                         /* Reset temporary destination */
2178                         memset(&sub->tmpdest, 0, sizeof(sub->tmpdest));
2179                 } else {
2180                         dest.sin_addr = p->parent->ourip;
2181                         dest.sin_port = sin.sin_port;
2182                 }
2183         }
2184         ast_debug(1, "We're at %s port %d\n", ast_inet_ntoa(p->parent->ourip), ntohs(sin.sin_port));
2185         ast_copy_string(v, "v=0\r\n", sizeof(v));
2186         snprintf(o, sizeof(o), "o=root %d %d IN IP4 %s\r\n", (int)getpid(), (int)getpid(), ast_inet_ntoa(dest.sin_addr));
2187         ast_copy_string(s, "s=session\r\n", sizeof(s));
2188         snprintf(c, sizeof(c), "c=IN IP4 %s\r\n", ast_inet_ntoa(dest.sin_addr));
2189         ast_copy_string(t, "t=0 0\r\n", sizeof(t));
2190         snprintf(m, sizeof(m), "m=audio %d RTP/AVP", ntohs(dest.sin_port));
2191         for (x = 1LL; x <= AST_FORMAT_AUDIO_MASK; x <<= 1) {
2192                 if (!(x & AST_FORMAT_AUDIO_MASK)) {
2193                         /* Audio is now discontiguous */
2194                         continue;
2195                 }
2196                 if (p->capability & x) {
2197                         ast_debug(1, "Answering with capability %s\n", ast_getformatname(x));
2198                         codec = ast_rtp_codecs_payload_code(ast_rtp_instance_get_codecs(sub->rtp), 1, x);
2199                         if (codec > -1) {
2200                                 snprintf(costr, sizeof(costr), " %d", codec);
2201                                 strncat(m, costr, sizeof(m) - strlen(m) - 1);
2202                                 snprintf(costr, sizeof(costr), "a=rtpmap:%d %s/8000\r\n", codec, ast_rtp_lookup_mime_subtype2(1, x, 0));
2203                                 strncat(a, costr, sizeof(a) - strlen(a) - 1);
2204                         }
2205                 }
2206         }
2207         for (x = 1LL; x <= AST_RTP_MAX; x <<= 1) {
2208                 if (p->nonCodecCapability & x) {
2209                         ast_debug(1, "Answering with non-codec capability %d\n", (int) x);
2210                         codec = ast_rtp_codecs_payload_code(ast_rtp_instance_get_codecs(sub->rtp), 0, x);
2211                         if (codec > -1) {
2212                                 snprintf(costr, sizeof(costr), " %d", codec);
2213                                 strncat(m, costr, sizeof(m) - strlen(m) - 1);
2214                                 snprintf(costr, sizeof(costr), "a=rtpmap:%d %s/8000\r\n", codec, ast_rtp_lookup_mime_subtype2(0, x, 0));
2215                                 strncat(a, costr, sizeof(a) - strlen(a) - 1);
2216                                 if (x == AST_RTP_DTMF) {
2217                                         /* Indicate we support DTMF...  Not sure about 16,
2218                                            but MSN supports it so dang it, we will too... */
2219                                         snprintf(costr, sizeof costr, "a=fmtp:%d 0-16\r\n", codec);
2220                                         strncat(a, costr, sizeof(a) - strlen(a) - 1);
2221                                 }
2222                         }
2223                 }
2224         }
2225         strncat(m, "\r\n", sizeof(m) - strlen(m) - 1);
2226         len = strlen(v) + strlen(s) + strlen(o) + strlen(c) + strlen(t) + strlen(m) + strlen(a);
2227         snprintf(costr, sizeof(costr), "%d", len);
2228         add_line(resp, v);
2229         add_line(resp, o);
2230         add_line(resp, s);
2231         add_line(resp, c);
2232         add_line(resp, t);
2233         add_line(resp, m);
2234         add_line(resp, a);
2235         return 0;
2236 }
2237
2238 static int transmit_modify_with_sdp(struct mgcp_subchannel *sub, struct ast_rtp_instance *rtp, format_t codecs)
2239 {
2240         struct mgcp_request resp;
2241         char local[256];
2242         char tmp[80];
2243         struct mgcp_endpoint *p = sub->parent;
2244         format_t x;
2245
2246         if (ast_strlen_zero(sub->cxident) && rtp) {
2247                 /* We don't have a CXident yet, store the destination and
2248                    wait a bit */
2249                 ast_rtp_instance_get_remote_address(rtp, &sub->tmpdest);
2250                 return 0;
2251         }
2252         ast_copy_string(local, "e:on, s:off, p:20", sizeof(local));
2253         for (x = 1; x <= AST_FORMAT_AUDIO_MASK; x <<= 1) {
2254                 if (!(x & AST_FORMAT_AUDIO_MASK)) {
2255                         /* No longer contiguous */
2256                         continue;
2257                 }
2258                 if (p->capability & x) {
2259                         snprintf(tmp, sizeof(tmp), ", a:%s", ast_rtp_lookup_mime_subtype2(1, x, 0));
2260                         strncat(local, tmp, sizeof(local) - strlen(local) - 1);
2261                 }
2262         }
2263
2264         if (sub->gate) {
2265                 if (sub->gate->state == GATE_ALLOCATED || sub->gate->state == GATE_OPEN) {
2266                         snprintf(tmp, sizeof(tmp), ", dq-gi:%x", sub->gate->gateid);
2267                         strncat(local, tmp, sizeof(local) - strlen(local) - 1);
2268                         sub->sdpsent = 1;
2269                 } else {
2270                         /* oops wait */
2271                         ast_debug(1, "Waiting for opened gate...\n");
2272                         sub->sdpsent = 0;
2273                         return 0;
2274                 }
2275         }
2276
2277
2278         reqprep(&resp, p, "MDCX");
2279         add_header(&resp, "C", sub->callid);
2280         add_header(&resp, "L", local);
2281         add_header(&resp, "M", mgcp_cxmodes[sub->cxmode]);
2282         /* X header should not be sent. kept for compatibility */
2283         add_header(&resp, "X", sub->txident);
2284         add_header(&resp, "I", sub->cxident);
2285         /*add_header(&resp, "S", "");*/
2286         add_sdp(&resp, sub, rtp);
2287         /* fill in new fields */
2288         resp.cmd = MGCP_CMD_MDCX;
2289         resp.trid = oseq;
2290         return send_request(p, sub, &resp, oseq);
2291 }
2292
2293 static int transmit_connect_with_sdp(struct mgcp_subchannel *sub, struct ast_rtp_instance *rtp)
2294 {
2295         struct mgcp_request resp;
2296         char local[256];
2297         char tmp[80];
2298         int x;
2299         struct mgcp_endpoint *p = sub->parent;
2300
2301         ast_debug(3, "Creating connection for %s@%s-%d in cxmode: %s callid: %s\n",
2302                  p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode], sub->callid);
2303
2304         ast_copy_string(local, "e:on, s:off, p:20", sizeof(local));
2305
2306         for (x = 1; x <= AST_FORMAT_AUDIO_MASK; x <<= 1) {
2307                 if (!(x & AST_FORMAT_AUDIO_MASK)) {
2308                         /* No longer contiguous */
2309                         continue;
2310                 }
2311                 if (p->capability & x) {
2312                         snprintf(tmp, sizeof(tmp), ", a:%s", ast_rtp_lookup_mime_subtype2(1, x, 0));
2313                         strncat(local, tmp, sizeof(local) - strlen(local) - 1);
2314                 }
2315         }
2316
2317         if (sub->gate) {
2318                 if(sub->gate->state == GATE_ALLOCATED) {
2319                         snprintf(tmp, sizeof(tmp), ", dq-gi:%x", sub->gate->gateid);
2320                         strncat(local, tmp, sizeof(local) - strlen(local) - 1);
2321                 }
2322         }
2323         sub->sdpsent = 1;
2324         reqprep(&resp, p, "CRCX");
2325         add_header(&resp, "C", sub->callid);
2326         add_header(&resp, "L", local);
2327         add_header(&resp, "M", mgcp_cxmodes[sub->cxmode]);
2328         /* X header should not be sent. kept for compatibility */
2329         add_header(&resp, "X", sub->txident);
2330         /*add_header(&resp, "S", "");*/
2331         add_sdp(&resp, sub, rtp);
2332         /* fill in new fields */
2333         resp.cmd = MGCP_CMD_CRCX;
2334         resp.trid = oseq;
2335         return send_request(p, sub, &resp, oseq);
2336 }
2337
2338 static int mgcp_pktcgate_remove(struct cops_gate *gate)
2339 {
2340         struct mgcp_subchannel *sub = gate->tech_pvt;
2341
2342         if (!sub) {
2343                 return 1;
2344         }
2345
2346         ast_mutex_lock(&sub->lock);
2347         ast_debug(1, "Pktc: gate 0x%x deleted\n", gate->gateid);
2348         if (sub->gate->state != GATE_CLOSED && sub->parent->hangupongateremove) {
2349                 sub->gate = NULL;
2350                 if (sub->owner) {
2351                         ast_softhangup(sub->owner, AST_CAUSE_REQUESTED_CHAN_UNAVAIL);
2352                         ast_channel_unlock(sub->owner);
2353                 }
2354         } else {
2355                 sub->gate = NULL;
2356         }
2357         ast_mutex_unlock(&sub->lock);
2358         return 1;
2359 }
2360
2361 static int mgcp_pktcgate_open(struct cops_gate *gate)
2362 {
2363         struct mgcp_subchannel *sub = gate->tech_pvt;
2364         if (!sub) {
2365                 return 1;
2366         }
2367         ast_mutex_lock(&sub->lock);
2368         ast_debug(1, "Pktc: gate 0x%x open\n", gate->gateid);
2369         if (!sub->sdpsent) transmit_modify_with_sdp(sub, NULL, 0);
2370         ast_mutex_unlock(&sub->lock);
2371         return 1;
2372 }
2373
2374 static int mgcp_alloc_pktcgate(struct mgcp_subchannel *sub)
2375 {
2376         struct mgcp_endpoint *p = sub->parent;
2377         sub->gate = ast_pktccops_gate_alloc(GATE_SET, NULL, ntohl(p->parent->addr.sin_addr.s_addr),
2378                                         8, 128000, 232, 0, 0, NULL, &mgcp_pktcgate_remove);
2379
2380         if (!sub->gate) {
2381                 return 0;
2382         }
2383         sub->gate->tech_pvt = sub;
2384         sub->gate->gate_open = &mgcp_pktcgate_open;
2385         return 1;
2386 }
2387
2388 static int transmit_connect(struct mgcp_subchannel *sub)
2389 {
2390         struct mgcp_request resp;
2391         char local[256];
2392         char tmp[80];
2393         format_t x;
2394         struct mgcp_endpoint *p = sub->parent;
2395
2396         ast_copy_string(local, "p:20, s:off, e:on", sizeof(local));
2397
2398         for (x = 1LL; x <= AST_FORMAT_AUDIO_MASK; x <<= 1) {
2399                 if (p->capability & x) {
2400                         snprintf(tmp, sizeof(tmp), ", a:%s", ast_rtp_lookup_mime_subtype2(1, x, 0));
2401                         strncat(local, tmp, sizeof(local) - strlen(local) - 1);
2402                 }
2403         }
2404
2405         ast_debug(3, "Creating connection for %s@%s-%d in cxmode: %s callid: %s\n",
2406                     p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode], sub->callid);
2407         sub->sdpsent = 0;
2408         reqprep(&resp, p, "CRCX");
2409         add_header(&resp, "C", sub->callid);
2410         add_header(&resp, "L", local);
2411         add_header(&resp, "M", "inactive");
2412         /* X header should not be sent. kept for compatibility */
2413         add_header(&resp, "X", sub->txident);
2414         /*add_header(&resp, "S", "");*/
2415         /* fill in new fields */
2416         resp.cmd = MGCP_CMD_CRCX;
2417         resp.trid = oseq;
2418         return send_request(p, sub, &resp, oseq);
2419 }
2420
2421 static int transmit_notify_request(struct mgcp_subchannel *sub, char *tone)
2422 {
2423         struct mgcp_request resp;
2424         struct mgcp_endpoint *p = sub->parent;
2425
2426         ast_debug(3, "MGCP Asked to indicate tone: %s on  %s@%s-%d in cxmode: %s\n",
2427                 tone, p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode]);
2428         ast_copy_string(p->curtone, tone, sizeof(p->curtone));
2429         reqprep(&resp, p, "RQNT");
2430         add_header(&resp, "X", p->rqnt_ident);
2431         switch (p->hookstate) {
2432         case MGCP_ONHOOK:
2433                 add_header(&resp, "R", "L/hd(N)");
2434                 break;
2435         case MGCP_OFFHOOK:
2436                 add_header_offhook(sub, &resp, tone);
2437                 break;
2438         }
2439         if (!ast_strlen_zero(tone)) {
2440                 add_header(&resp, "S", tone);
2441         }
2442         /* fill in new fields */
2443         resp.cmd = MGCP_CMD_RQNT;
2444         resp.trid = oseq;
2445         return send_request(p, NULL, &resp, oseq);
2446 }
2447
2448 static int transmit_notify_request_with_callerid(struct mgcp_subchannel *sub, char *tone, char *callernum, char *callername)
2449 {
2450         struct mgcp_request resp;
2451         char tone2[256];
2452         char *l, *n;
2453         struct timeval t = ast_tvnow();
2454         struct ast_tm tm;
2455         struct mgcp_endpoint *p = sub->parent;
2456
2457         ast_localtime(&t, &tm, NULL);
2458         n = callername;
2459         l = callernum;
2460         if (!n)
2461                 n = "";
2462         if (!l)
2463                 l = "";
2464
2465         /* Keep track of last callerid for blacklist and callreturn */
2466         ast_copy_string(p->lastcallerid, l, sizeof(p->lastcallerid));
2467
2468         snprintf(tone2, sizeof(tone2), "%s,L/ci(%02d/%02d/%02d/%02d,%s,%s)", tone,
2469                 tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, l, n);
2470         ast_copy_string(p->curtone, tone, sizeof(p->curtone));
2471         reqprep(&resp, p, "RQNT");
2472         add_header(&resp, "X", p->rqnt_ident);
2473         switch (p->hookstate) {
2474         case MGCP_ONHOOK:
2475                 add_header(&resp, "R", "L/hd(N)");
2476                 break;
2477         case MGCP_OFFHOOK:
2478                 add_header_offhook(sub, &resp, tone);
2479                 break;
2480         }
2481         if (!ast_strlen_zero(tone2)) {
2482                 add_header(&resp, "S", tone2);
2483         }
2484         ast_debug(3, "MGCP Asked to indicate tone: %s on  %s@%s-%d in cxmode: %s\n",
2485                 tone2, p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode]);
2486         /* fill in new fields */
2487         resp.cmd = MGCP_CMD_RQNT;
2488         resp.trid = oseq;
2489         return send_request(p, NULL, &resp, oseq);
2490 }
2491
2492 static int transmit_modify_request(struct mgcp_subchannel *sub)
2493 {
2494         struct mgcp_request resp;
2495         struct mgcp_endpoint *p = sub->parent;
2496         format_t x;
2497         int fc = 1;
2498         char local[256];
2499         char tmp[80];
2500
2501         if (ast_strlen_zero(sub->cxident)) {
2502                 /* We don't have a CXident yet, store the destination and
2503                    wait a bit */
2504                 return 0;
2505         }
2506         ast_debug(3, "Modified %s@%s-%d with new mode: %s on callid: %s\n",
2507                 p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode], sub->callid);
2508
2509         ast_copy_string(local, "", sizeof(local));
2510         for (x = 1; x <= AST_FORMAT_AUDIO_MASK; x <<= 1) {
2511                 if (p->capability & x) {
2512                         if (p->ncs && !fc) {
2513                                 p->capability = x; /* sb5120e bug */
2514                                 break;
2515                         } else {
2516                                 fc = 0;
2517                                 snprintf(tmp, sizeof(tmp), ", a:%s", ast_rtp_lookup_mime_subtype2(1, x, 0));
2518                         }
2519                         strncat(local, tmp, sizeof(local) - strlen(local) - 1);
2520                 }
2521         }
2522
2523         if (!sub->sdpsent) {
2524                 if (sub->gate) {
2525                         if (sub->gate->state == GATE_ALLOCATED || sub->gate->state == GATE_OPEN) {
2526                                 snprintf(tmp, sizeof(tmp), ", dq-gi:%x", sub->gate->gateid);
2527                                 strncat(local, tmp, sizeof(local) - strlen(local) - 1);
2528                         } else {
2529                                         /* we still dont have gateid wait */
2530                                 return 0;
2531                         }
2532                 }
2533         }
2534
2535         reqprep(&resp, p, "MDCX");
2536         add_header(&resp, "C", sub->callid);
2537         if (!sub->sdpsent) {
2538                 add_header(&resp, "L", local);
2539         }
2540         add_header(&resp, "M", mgcp_cxmodes[sub->cxmode]);
2541         /* X header should not be sent. kept for compatibility */
2542         add_header(&resp, "X", sub->txident);
2543         add_header(&resp, "I", sub->cxident);
2544         switch (sub->parent->hookstate) {
2545         case MGCP_ONHOOK:
2546                 add_header(&resp, "R", "L/hd(N)");
2547                 break;
2548         case MGCP_OFFHOOK:
2549                 add_header_offhook(sub, &resp, "");
2550                 break;
2551         }
2552         if (!sub->sdpsent) {
2553                 add_sdp(&resp, sub, NULL);
2554                 sub->sdpsent = 1;
2555         }
2556         /* fill in new fields */
2557         resp.cmd = MGCP_CMD_MDCX;
2558         resp.trid = oseq;
2559         return send_request(p, sub, &resp, oseq);
2560 }
2561
2562
2563 static void add_header_offhook(struct mgcp_subchannel *sub, struct mgcp_request *resp, char *tone)
2564 {
2565         struct mgcp_endpoint *p = sub->parent;
2566         char tone_indicate_end = 0;
2567
2568         /* We also should check the tone to indicate, because it have no sense
2569            to request notify D/[0-9#*] (dtmf keys) if we are sending congestion
2570            tone for example G/cg */
2571         if (p && (!strcasecmp(tone, (p->ncs ? "L/ro" : "G/cg")))) {
2572                 tone_indicate_end = 1;
2573         }
2574
2575         if (p && p->sub && p->sub->owner &&
2576                         p->sub->owner->_state >= AST_STATE_RINGING &&
2577                         (p->dtmfmode & (MGCP_DTMF_INBAND | MGCP_DTMF_HYBRID))) {
2578             add_header(resp, "R", "L/hu(N),L/hf(N)");
2579
2580         } else if (!tone_indicate_end){
2581             add_header(resp, "R", (p->ncs ? "L/hu(N),L/hf(N),L/[0-9#*](N)" : "L/hu(N),L/hf(N),D/[0-9#*](N)"));
2582         } else {
2583                 ast_debug(1, "We don't want more digits if we will end the call\n");
2584                 add_header(resp, "R", "L/hu(N),L/hf(N)");
2585         }
2586 }
2587
2588
2589
2590
2591 static int transmit_audit_endpoint(struct mgcp_endpoint *p)
2592 {
2593         struct mgcp_request resp;
2594         reqprep(&resp, p, "AUEP");
2595         /* removed unknown param VS */
2596         /*add_header(&resp, "F", "A,R,D,S,X,N,I,T,O,ES,E,MD,M");*/
2597         add_header(&resp, "F", "A");
2598         /* fill in new fields */
2599         resp.cmd = MGCP_CMD_AUEP;
2600         resp.trid = oseq;
2601         return send_request(p, NULL, &resp, oseq);
2602 }
2603
2604 static int transmit_connection_del(struct mgcp_subchannel *sub)
2605 {
2606         struct mgcp_endpoint *p = sub->parent;
2607         struct mgcp_request resp;
2608
2609         ast_debug(3, "Delete connection %s %s@%s-%d with new mode: %s on callid: %s\n",
2610                 sub->cxident, p->name, p->parent->name, sub->id, mgcp_cxmodes[sub->cxmode], sub->callid);
2611         reqprep(&resp, p, "DLCX");
2612         /* check if call id is avail */
2613         if (sub->callid[0])
2614                 add_header(&resp, "C", sub->callid);
2615         /* X header should not be sent. kept for compatibility */
2616         add_header(&resp, "X", sub->txident);
2617         /* check if cxident is avail */
2618         if (sub->cxident[0])
2619                 add_header(&resp, "I", sub->cxident);
2620         /* fill in new fields */
2621         resp.cmd = MGCP_CMD_DLCX;
2622         resp.trid = oseq;
2623         return send_request(p, sub, &resp, oseq);
2624 }
2625
2626 static int transmit_connection_del_w_params(struct mgcp_endpoint *p, char *callid, char *cxident)
2627 {
2628         struct mgcp_request resp;
2629
2630         ast_debug(3, "Delete connection %s %s@%s on callid: %s\n",
2631                 cxident ? cxident : "", p->name, p->parent->name, callid ? callid : "");
2632         reqprep(&resp, p, "DLCX");
2633         /* check if call id is avail */
2634         if (callid && *callid)
2635                 add_header(&resp, "C", callid);
2636         /* check if cxident is avail */
2637         if (cxident && *cxident)
2638                 add_header(&resp, "I", cxident);
2639         /* fill in new fields */
2640         resp.cmd = MGCP_CMD_DLCX;
2641         resp.trid = oseq;
2642         return send_request(p, p->sub, &resp, oseq);
2643 }
2644
2645 /*! \brief  dump_cmd_queues: (SC:) cleanup pending commands */
2646 static void dump_cmd_queues(struct mgcp_endpoint *p, struct mgcp_subchannel *sub)
2647 {
2648         struct mgcp_request *t, *q;
2649
2650         if (p) {
2651                 ast_mutex_lock(&p->rqnt_queue_lock);
2652                 for (q = p->rqnt_queue; q; t = q->next, ast_free(q), q=t);
2653                 p->rqnt_queue = NULL;
2654                 ast_mutex_unlock(&p->rqnt_queue_lock);
2655
2656                 ast_mutex_lock(&p->cmd_queue_lock);
2657                 for (q = p->cmd_queue; q; t = q->next, ast_free(q), q=t);
2658                 p->cmd_queue = NULL;
2659                 ast_mutex_unlock(&p->cmd_queue_lock);
2660
2661                 ast_mutex_lock(&p->sub->cx_queue_lock);
2662                 for (q = p->sub->cx_queue; q; t = q->next, ast_free(q), q=t);
2663                 p->sub->cx_queue = NULL;
2664                 ast_mutex_unlock(&p->sub->cx_queue_lock);
2665
2666                 ast_mutex_lock(&p->sub->next->cx_queue_lock);
2667                 for (q = p->sub->next->cx_queue; q; t = q->next, ast_free(q), q=t);
2668                 p->sub->next->cx_queue = NULL;
2669                 ast_mutex_unlock(&p->sub->next->cx_queue_lock);
2670         } else if (sub) {
2671                 ast_mutex_lock(&sub->cx_queue_lock);
2672                 for (q = sub->cx_queue; q; t = q->next, ast_free(q), q=t);
2673                 sub->cx_queue = NULL;
2674                 ast_mutex_unlock(&sub->cx_queue_lock);
2675         }
2676 }
2677
2678
2679 /*! \brief  find_command: (SC:) remove command transaction from queue */
2680 static struct mgcp_request *find_command(struct mgcp_endpoint *p, struct mgcp_subchannel *sub,
2681                 struct mgcp_request **queue, ast_mutex_t *l, int ident)
2682 {
2683         struct mgcp_request *prev, *req;
2684
2685         ast_mutex_lock(l);
2686         for (prev = NULL, req = *queue; req; prev = req, req = req->next) {
2687                 if (req->trid == ident) {
2688                         /* remove from queue */
2689                         if (!prev)
2690                                 *queue = req->next;
2691                         else
2692                                 prev->next = req->next;
2693
2694                         /* send next pending command */
2695                         if (*queue) {
2696                                 ast_debug(1, "Posting Queued Request:\n%s to %s:%d\n", (*queue)->data,
2697                                         ast_inet_ntoa(p->parent->addr.sin_addr), ntohs(p->parent->addr.sin_port));
2698
2699                                 mgcp_postrequest(p, sub, (*queue)->data, (*queue)->len, (*queue)->trid);
2700                         }
2701                         break;
2702                 }
2703         }
2704         ast_mutex_unlock(l);
2705         return req;
2706 }
2707
2708 /* modified for new transport mechanism */
2709 static void handle_response(struct mgcp_endpoint *p, struct mgcp_subchannel *sub,
2710                 int result, unsigned int ident, struct mgcp_request *resp)
2711 {
2712         char *c;
2713         struct mgcp_request *req;
2714         struct mgcp_gateway *gw = p->parent;
2715
2716         if (result < 200) {
2717                 /* provisional response */
2718                 return;
2719         }
2720
2721         if (p->slowsequence)
2722                 req = find_command(p, sub, &p->cmd_queue, &p->cmd_queue_lock, ident);
2723         else if (sub)
2724                 req = find_command(p, sub, &sub->cx_queue, &sub->cx_queue_lock, ident);
2725         else if (!(req = find_command(p, sub, &p->rqnt_queue, &p->rqnt_queue_lock, ident)))
2726                 req = find_command(p, sub, &p->cmd_queue, &p->cmd_queue_lock, ident);
2727
2728         if (!req) {
2729                 ast_verb(3, "No command found on [%s] for transaction %d. Ignoring...\n",
2730                                 gw->name, ident);
2731                 return;
2732         }
2733
2734         if (p && (result >= 400) && (result <= 599)) {
2735                 switch (result) {
2736                 case 401:
2737                         p->hookstate = MGCP_OFFHOOK;
2738                         break;
2739                 case 402:
2740                         p->hookstate = MGCP_ONHOOK;
2741                         break;
2742                 case 406:
2743                         ast_log(LOG_NOTICE, "Transaction %d timed out\n", ident);
2744                         break;
2745                 case 407:
2746                         ast_log(LOG_NOTICE, "Transaction %d aborted\n", ident);
2747                         break;
2748                 }
2749                 if (sub) {
2750                         if (!sub->cxident[0] && (req->cmd == MGCP_CMD_CRCX)) {
2751                             ast_log(LOG_NOTICE, "DLCX for all connections on %s due to error %d\n", gw->name, result);
2752                             transmit_connection_del(sub);
2753                         }
2754                         if (sub->owner) {
2755                                 ast_log(LOG_NOTICE, "Terminating on result %d from %s@%s-%d\n",
2756                                         result, p->name, p->parent->name, sub ? sub->id:-1);
2757                                 mgcp_queue_hangup(sub);
2758                         }
2759                 } else {
2760                         if (p->sub->next->owner) {
2761                                 ast_log(LOG_NOTICE, "Terminating on result %d from %s@%s-%d\n",
2762                                         result, p->name, p->parent->name, sub ? sub->id:-1);
2763                                 mgcp_queue_hangup(p->sub);
2764                         }
2765
2766                         if (p->sub->owner) {
2767                                 ast_log(LOG_NOTICE, "Terminating on result %d from %s@%s-%d\n",
2768                                         result, p->name, p->parent->name, sub ? sub->id:-1);
2769                                 mgcp_queue_hangup(p->sub);
2770                         }
2771
2772                         dump_cmd_queues(p, NULL);
2773                 }
2774         }
2775
2776         if (resp) {
2777                 /* responseAck: */
2778                 if (result == 200 && (req->cmd == MGCP_CMD_CRCX || req->cmd == MGCP_CMD_MDCX)) {
2779                                 if (sub) {
2780                                         transmit_response(sub, "000", resp, "OK");
2781                                         if (sub->owner && sub->owner->_state == AST_STATE_RINGING) {
2782                                                 ast_queue_control(sub->owner, AST_CONTROL_RINGING);
2783                                         }
2784                                 }
2785                 }
2786                 if (req->cmd == MGCP_CMD_CRCX) {
2787                         if ((c = get_header(resp, "I"))) {
2788                                 if (!ast_strlen_zero(c) && sub) {
2789                                         /* if we are hanging up do not process this conn. */
2790                                         if (sub->owner) {
2791                                                 if (!ast_strlen_zero(sub->cxident)) {
2792                                                         if (strcasecmp(c, sub->cxident)) {
2793                                                                 ast_log(LOG_WARNING, "Subchannel already has a cxident. sub->cxident: %s requested %s\n", sub->cxident, c);
2794                                                         }
2795                                                 }
2796                                                 ast_copy_string(sub->cxident, c, sizeof(sub->cxident));
2797                                                 if (sub->tmpdest.sin_addr.s_addr) {
2798                                                         transmit_modify_with_sdp(sub, NULL, 0);
2799                                                 }
2800                                         } else {
2801                                                 /* XXX delete this one
2802                                                    callid and conn id may already be lost.
2803                                                    so the following del conn may have a side effect of
2804                                                    cleaning up the next subchannel */
2805                                                 transmit_connection_del(sub);
2806                                         }
2807                                 }
2808                         }
2809                 }
2810
2811                 if (req->cmd == MGCP_CMD_AUEP) {
2812                         /* check stale connection ids */
2813                         if ((c = get_header(resp, "I"))) {
2814                                 char *v, *n;
2815                                 int len;
2816                                 while ((v = get_csv(c, &len, &n))) {
2817                                         if (len) {
2818                                                 if (strncasecmp(v, p->sub->cxident, len) &&
2819                                                     strncasecmp(v, p->sub->next->cxident, len)) {
2820                                                         /* connection id not found. delete it */
2821                                                         char cxident[80] = "";
2822
2823                                                         if (len > (sizeof(cxident) - 1))
2824                                                                 len = sizeof(cxident) - 1;
2825                                                         ast_copy_string(cxident, v, len);
2826                                                         ast_verb(3, "Non existing connection id %s on %s@%s \n",
2827                                                                             cxident, p->name, gw->name);
2828                                                         transmit_connection_del_w_params(p, NULL, cxident);
2829                                                 }
2830                                         }
2831                                         c = n;
2832                                 }
2833                         }
2834
2835                         /* Try to determine the hookstate returned from an audit endpoint command */
2836                         if ((c = get_header(resp, "ES"))) {
2837                                 if (!ast_strlen_zero(c)) {
2838                                         if (strstr(c, "hu")) {
2839                                                 if (p->hookstate != MGCP_ONHOOK) {
2840                                                         /* XXX cleanup if we think we are offhook XXX */
2841                                                         if ((p->sub->owner || p->sub->next->owner ) &&
2842                                                             p->hookstate == MGCP_OFFHOOK)
2843                                                                 mgcp_queue_hangup(sub);
2844                                                         p->hookstate = MGCP_ONHOOK;
2845
2846                                                         /* update the requested events according to the new hookstate */
2847                                                         transmit_notify_request(p->sub, "");
2848
2849                                                         ast_verb(3, "Setting hookstate of %s@%s to ONHOOK\n", p->name, gw->name);
2850                                                         }
2851                                         } else if (strstr(c, "hd")) {
2852                                                 if (p->hookstate != MGCP_OFFHOOK) {
2853                                                         p->hookstate = MGCP_OFFHOOK;
2854
2855                                                         /* update the requested events according to the new hookstate */
2856                                                         transmit_notify_request(p->sub, "");
2857
2858                                                         ast_verb(3, "Setting hookstate of %s@%s to OFFHOOK\n", p->name, gw->name);
2859                                                         }
2860                                                 }
2861                                         }
2862                                 }
2863                         }
2864
2865                 if (resp && resp->lines) {
2866                         /* do not process sdp if we are hanging up. this may be a late response */
2867                         if (sub && sub->owner) {
2868                                 if (!sub->rtp)
2869                                         start_rtp(sub);
2870                                 if (sub->rtp)
2871                                         process_sdp(sub, resp);
2872                         }
2873                 }
2874         }
2875
2876         ast_free(req);
2877 }
2878
2879 static void start_rtp(struct mgcp_subchannel *sub)
2880 {
2881         ast_mutex_lock(&sub->lock);
2882         /* check again to be on the safe side */
2883         if (sub->rtp) {
2884                 ast_rtp_instance_destroy(sub->rtp);
2885                 sub->rtp = NULL;
2886         }
2887         /* Allocate the RTP now */
2888         sub->rtp = ast_rtp_instance_new("asterisk", sched, &bindaddr, NULL);
2889         if (sub->rtp && sub->owner)
2890                 ast_channel_set_fd(sub->owner, 0, ast_rtp_instance_fd(sub->rtp, 0));
2891         if (sub->rtp) {
2892                 ast_rtp_instance_set_qos(sub->rtp, qos.tos_audio, qos.cos_audio, "MGCP RTP");
2893                 ast_rtp_instance_set_prop(sub->rtp, AST_RTP_PROPERTY_NAT, sub->nat);
2894         }
2895         /* Make a call*ID */
2896         snprintf(sub->callid, sizeof(sub->callid), "%08lx%s", ast_random(), sub->txident);
2897         /* Transmit the connection create */
2898         if(!sub->parent->pktcgatealloc) {
2899                 transmit_connect_with_sdp(sub, NULL);
2900         } else {
2901                 transmit_connect(sub);
2902                 sub->gate = NULL;
2903                 if(!mgcp_alloc_pktcgate(sub))
2904                         mgcp_queue_hangup(sub);
2905         }
2906         ast_mutex_unlock(&sub->lock);
2907 }
2908
2909 static void *mgcp_ss(void *data)
2910 {
2911         struct ast_channel *chan = data;
2912         struct mgcp_subchannel *sub = chan->tech_pvt;
2913         struct mgcp_endpoint *p = sub->parent;
2914         /* char exten[AST_MAX_EXTENSION] = ""; */
2915         int len = 0;
2916         int timeout = firstdigittimeout;
2917         int res= 0;
2918         int getforward = 0;
2919         int loop_pause = 100;
2920
2921         len = strlen(p->dtmf_buf);
2922
2923         while (len < AST_MAX_EXTENSION - 1) {
2924                 ast_debug(1, "Dtmf buffer '%s' for '%s@%s'\n", p->dtmf_buf, p->name, p->parent->name);
2925                 res = 1;  /* Assume that we will get a digit */
2926                 while (strlen(p->dtmf_buf) == len) {
2927                         ast_safe_sleep(chan, loop_pause);
2928                         timeout -= loop_pause;
2929                         if (timeout <= 0){
2930                                 res = 0;
2931                                 break;
2932                         }
2933                         res = 1;
2934                 }
2935
2936                 timeout = 0;
2937                 len = strlen(p->dtmf_buf);
2938
2939                 if (!ast_ignore_pattern(chan->context, p->dtmf_buf)) {
2940                         /*res = tone_zone_play_tone(p->subs[index].zfd, -1);*/
2941                         ast_indicate(chan, -1);
2942                 } else {
2943                         /* XXX Redundant?  We should already be playing dialtone */
2944                         /*tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALTONE);*/
2945                         transmit_notify_request(sub, "L/dl");
2946                 }
2947                 if (ast_exists_extension(chan, chan->context, p->dtmf_buf, 1, p->cid_num)) {
2948                         if (!res || !ast_matchmore_extension(chan, chan->context, p->dtmf_buf, 1, p->cid_num)) {
2949                                 if (getforward) {
2950                                         /* Record this as the forwarding extension */
2951                                         ast_copy_string(p->call_forward, p->dtmf_buf, sizeof(p->call_forward));
2952                                         ast_verb(3, "Setting call forward to '%s' on channel %s\n",
2953                                                         p->call_forward, chan->name);
2954                                         /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
2955                                         transmit_notify_request(sub, "L/sl");
2956                                         if (res)
2957                                                 break;
2958                                         usleep(500000);
2959                                         /*res = tone_zone_play_tone(p->subs[index].zfd, -1);*/
2960                                         ast_indicate(chan, -1);
2961                                         sleep(1);
2962                                         memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
2963                                         /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALTONE);*/
2964                                         transmit_notify_request(sub, "L/dl");
2965                                         len = 0;
2966                                         getforward = 0;
2967                                 } else {
2968                                         /*res = tone_zone_play_tone(p->subs[index].zfd, -1);*/
2969                                         ast_indicate(chan, -1);
2970                                         ast_copy_string(chan->exten, p->dtmf_buf, sizeof(chan->exten));
2971                                         chan->cid.cid_dnid = ast_strdup(p->dtmf_buf);
2972                                         memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
2973                                         ast_set_callerid(chan,
2974                                                 p->hidecallerid ? "" : p->cid_num,
2975                                                 p->hidecallerid ? "" : p->cid_name,
2976                                                 chan->cid.cid_ani ? NULL : p->cid_num);
2977                                         ast_setstate(chan, AST_STATE_RING);
2978                                         /*dahdi_enable_ec(p);*/
2979                                         if (p->dtmfmode & MGCP_DTMF_HYBRID) {
2980                                                 p->dtmfmode |= MGCP_DTMF_INBAND;
2981                                                 ast_indicate(chan, -1);
2982                                         }
2983                                         res = ast_pbx_run(chan);
2984                                         if (res) {
2985                                                 ast_log(LOG_WARNING, "PBX exited non-zero\n");
2986                                                 /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_CONGESTION);*/
2987                                                 /*transmit_notify_request(p, "nbz", 1);*/
2988                                                 transmit_notify_request(sub, p->ncs ? "L/cg" : "G/cg");
2989                                         }
2990                                         return NULL;
2991                                 }
2992                         } else {
2993                                 /* It's a match, but they just typed a digit, and there is an ambiguous match,
2994                                    so just set the timeout to matchdigittimeout and wait some more */
2995                                 timeout = matchdigittimeout;
2996                         }
2997                 } else if (res == 0) {
2998                         ast_debug(1, "not enough digits (and no ambiguous match)...\n");
2999                         /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_CONGESTION);*/
3000                         transmit_notify_request(sub, p->ncs ? "L/cg" : "G/cg");
3001                         /*dahdi_wait_event(p->subs[index].zfd);*/
3002                         ast_hangup(chan);
3003                         memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
3004                         return NULL;
3005                 } else if (p->hascallwaiting && p->callwaiting && !strcmp(p->dtmf_buf, "*70")) {
3006                         ast_verb(3, "Disabling call waiting on %s\n", chan->name);
3007                         /* Disable call waiting if enabled */
3008                         p->callwaiting = 0;
3009                         /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
3010                         transmit_notify_request(sub, "L/sl");
3011                         len = 0;
3012                         memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
3013                         timeout = firstdigittimeout;
3014                 } else if (!strcmp(p->dtmf_buf,ast_pickup_ext())) {
3015                         /* Scan all channels and see if any there
3016                          * ringing channqels with that have call groups
3017                          * that equal this channels pickup group
3018                          */
3019                         if (ast_pickup_call(chan)) {
3020                                 ast_log(LOG_WARNING, "No call pickup possible...\n");
3021                                 /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_CONGESTION);*/
3022                                 transmit_notify_request(sub, p->ncs ? "L/cg" : "G/cg");
3023                         }
3024                         memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
3025                         ast_hangup(chan);
3026                         return NULL;
3027                 } else if (!p->hidecallerid && !strcmp(p->dtmf_buf, "*67")) {
3028                         ast_verb(3, "Disabling Caller*ID on %s\n", chan->name);
3029                         /* Disable Caller*ID if enabled */
3030                         p->hidecallerid = 1;
3031                         ast_set_callerid(chan, "", "", NULL);
3032                         /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
3033                         transmit_notify_request(sub, "L/sl");
3034                         len = 0;
3035                         memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
3036                         timeout = firstdigittimeout;
3037                 } else if (p->callreturn && !strcmp(p->dtmf_buf, "*69")) {
3038                         res = 0;
3039                         if (!ast_strlen_zero(p->lastcallerid)) {
3040                                 res = ast_say_digit_str(chan, p->lastcallerid, "", chan->language);
3041                         }
3042                         if (!res)
3043                                 /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
3044                                 transmit_notify_request(sub, "L/sl");
3045                         break;
3046                 } else if (!strcmp(p->dtmf_buf, "*78")) {
3047                         /* Do not disturb */
3048                         ast_verb(3, "Enabled DND on channel %s\n", chan->name);
3049                         /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
3050                         transmit_notify_request(sub, "L/sl");
3051                         p->dnd = 1;
3052                         getforward = 0;
3053                         memset(p->dtmf_buf, 0, sizeof(p->dtmf_buf));
3054                         len = 0;
3055                 } else if (!strcmp(p->dtmf_buf, "*79")) {
3056                         /* Do not disturb */
3057                         ast_verb(3, "Disabled DND on channel %s\n", chan->name);
3058                         /*res = tone_zone_play_tone(p->subs[index].zfd, DAHDI_TONE_DIALRECALL);*/
3059                         transmit_notify_request(sub, "L/sl");
3060        &