bchannel.c

   1 /*****************************************************************************\
   2 **                                                                           **
   3 ** Linux Call Router                                                         **
   4 **                                                                           **
   5 **---------------------------------------------------------------------------**
   6 ** Copyright: Andreas Eversberg                                              **
   7 **                                                                           **
   8 ** mISDN channel handlin for remote application                              **
   9 **                                                                           **
  10 \*****************************************************************************/
  11
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <unistd.h>
  15 #include <string.h>
  16 #include <poll.h>
  17 #include <errno.h>
  18 #include <sys/ioctl.h>
  19 #include <sys/types.h>
  20 #include <sys/stat.h>
  21 #include <fcntl.h>
  22 #include <netinet/udp.h>
  23 #include <netinet/in.h>
  24 #include <netdb.h>
  25 #include <sys/socket.h>
  26 #include <mISDNif.h>
  27
  28 #include <asterisk/frame.h>
  29
  30
  31 #include "extension.h"
  32 #include "message.h"
  33 #include "lcrsocket.h"
  34 #include "cause.h"
  35 #include "bchannel.h"
  36 #include "chan_lcr.h"
  37 #include "callerid.h"
  38
  39
  40 #ifndef ISDN_PID_L4_B_USER
  41 #define ISDN_PID_L4_B_USER 0x440000ff
  42 #endif
  43
  44 pid_t   bchannel_pid;
  45
  46 enum {
  47         BSTATE_IDLE,
  48         BSTATE_ACTIVATING,
  49         BSTATE_ACTIVE,
  50         BSTATE_DEACTIVATING,
  51 };
  52
  53
  54 int bchannel_initialize(void)
  55 {
  56         return(0);
  57 }
  58
  59 void bchannel_deinitialize(void)
  60 {
  61 }
  62
  63 /*
  64  * send control information to the channel (dsp-module)
  65  */
  66 static void ph_control(unsigned long handle, unsigned long c1, unsigned long c2, char *trace_name, int trace_value, int b_mode)
  67 {
  68         unsigned char buffer[MISDN_HEADER_LEN+sizeof(int)+sizeof(int)];
  69         struct mISDNhead *ctrl = (struct mISDNhead *)buffer;
  70         unsigned long *d = (unsigned long *)(buffer+MISDN_HEADER_LEN);
  71         int ret;
  72
  73         if (b_mode != 0 && b_mode != 2)
  74                 return;
  75
  76         CDEBUG(NULL, NULL, "Sending PH_CONTROL %s %x,%x\n", trace_name, c1, c2);
  77         ctrl->prim = PH_CONTROL_REQ;
  78         ctrl->id = 0;
  79         *d++ = c1;
  80         *d++ = c2;
  81         ret = sendto(handle, buffer, MISDN_HEADER_LEN+sizeof(int)*2, 0, NULL, 0);
  82         if (ret < 0)
  83                 CERROR(NULL, NULL, "Failed to send to socket %d\n", handle);
  84 }
  85
  86 static void ph_control_block(unsigned long handle, unsigned long c1, void *c2, int c2_len, char *trace_name, int trace_value, int b_mode)
  87 {
  88         unsigned char buffer[MISDN_HEADER_LEN+sizeof(int)+c2_len];
  89         struct mISDNhead *ctrl = (struct mISDNhead *)buffer;
  90         unsigned long *d = (unsigned long *)(buffer+MISDN_HEADER_LEN);
  91         int ret;
  92
  93         if (b_mode != 0 && b_mode != 2)
  94                 return;
  95
  96         CDEBUG(NULL, NULL, "Sending PH_CONTROL (block) %s %x\n", trace_name, c1);
  97         ctrl->prim = PH_CONTROL_REQ;
  98         ctrl->id = 0;
  99         *d++ = c1;
 100         memcpy(d, c2, c2_len);
 101         ret = sendto(handle, buffer, MISDN_HEADER_LEN+sizeof(int)+c2_len, 0, NULL, 0);
 102         if (ret < 0)
 103                 CERROR(NULL, NULL, "Failed to send to socket %d\n", handle);
 104 }
 105
 106
 107 /*
 108  * create stack
 109  */
 110 int bchannel_create(struct bchannel *bchannel, int mode)
 111 {
 112         int ret;
 113         unsigned long on = 1;
 114         struct sockaddr_mISDN addr;
 115
 116         if (bchannel->b_sock)
 117         {
 118                 CERROR(NULL, NULL, "Socket already created for handle 0x%x\n", bchannel->handle);
 119                 return(0);
 120         }
 121
 122         /* open socket */
 123         bchannel->b_mode = mode;
 124         switch(bchannel->b_mode)
 125         {
 126                 case 0:
 127                 bchannel->b_sock = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_L2DSP);
 128                 break;
 129                 case 1:
 130                 bchannel->b_sock = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_RAW);
 131                 break;
 132                 case 2:
 133                 bchannel->b_sock = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_L2DSPHDLC);
 134                 break;
 135                 case 3:
 136                 bchannel->b_sock = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_HDLC);
 137                 break;
 138         }
 139         if (bchannel->b_sock < 0)
 140         {
 141                 CERROR(NULL, NULL, "Failed to open bchannel-socket for handle 0x%x with mISDN-DSP layer. Did you load mISDNdsp.ko?\n", bchannel->handle);
 142                 return(0);
 143         }
 144
 145         /* set nonblocking io */
 146         ret = ioctl(bchannel->b_sock, FIONBIO, &on);
 147         if (ret < 0)
 148         {
 149                 CERROR(NULL, NULL, "Failed to set bchannel-socket handle 0x%x into nonblocking IO\n", bchannel->handle);
 150                 close(bchannel->b_sock);
 151                 bchannel->b_sock = -1;
 152                 return(0);
 153         }
 154
 155         /* bind socket to bchannel */
 156         addr.family = AF_ISDN;
 157         addr.dev = (bchannel->handle>>8)-1;
 158         addr.channel = bchannel->handle & 0xff;
 159         ret = bind(bchannel->b_sock, (struct sockaddr *)&addr, sizeof(addr));
 160         if (ret < 0)
 161         {
 162                 CERROR(NULL, NULL, "Failed to bind bchannel-socket for handle 0x%x with mISDN-DSP layer. (port %d, channel %d) Did you load mISDNdsp.ko?\n", bchannel->handle, addr.dev + 1, addr.channel);
 163                 close(bchannel->b_sock);
 164                 bchannel->b_sock = -1;
 165                 return(0);
 166         }
 167         return(1);
 168 }
 169
 170
 171 /*
 172  * activate / deactivate request
 173  */
 174 void bchannel_activate(struct bchannel *bchannel, int activate)
 175 {
 176         struct mISDNhead act;
 177         int ret;
 178
 179         /* activate bchannel */
 180         CDEBUG(NULL, NULL, "%sActivating B-channel.\n", activate?"":"De-");
 181         switch(bchannel->b_mode)
 182         {
 183                 case 0:
 184                 case 2:
 185                 act.prim = (activate)?DL_ESTABLISH_REQ:DL_RELEASE_REQ;
 186                 break;
 187                 case 1:
 188                 case 3:
 189                 act.prim = (activate)?PH_ACTIVATE_REQ:PH_DEACTIVATE_REQ;
 190                 break;
 191         }
 192         act.id = 0;
 193         ret = sendto(bchannel->b_sock, &act, MISDN_HEADER_LEN, 0, NULL, 0);
 194         if (ret < 0)
 195                 CERROR(NULL, NULL, "Failed to send to socket %d\n", bchannel->b_sock);
 196
 197         bchannel->b_state = (activate)?BSTATE_ACTIVATING:BSTATE_DEACTIVATING;
 198 }
 199
 200
 201 /*
 202  * set features
 203  */
 204 static void bchannel_activated(struct bchannel *bchannel)
 205 {
 206         int handle;
 207
 208         handle = bchannel->b_sock;
 209
 210         /* set dsp features */
 211         if (bchannel->b_txdata)
 212                 ph_control(handle, (bchannel->b_txdata)?DSP_TXDATA_ON:DSP_TXDATA_OFF, 0, "DSP-TXDATA", bchannel->b_txdata, bchannel->b_mode);
 213         if (bchannel->b_delay)
 214                 ph_control(handle, DSP_DELAY, bchannel->b_delay, "DSP-DELAY", bchannel->b_delay, bchannel->b_mode);
 215         if (bchannel->b_tx_dejitter)
 216                 ph_control(handle, (bchannel->b_tx_dejitter)?DSP_TX_DEJITTER:DSP_TX_DEJ_OFF, 0, "DSP-TX_DEJITTER", bchannel->b_tx_dejitter, bchannel->b_mode);
 217         if (bchannel->b_tx_gain)
 218                 ph_control(handle, DSP_VOL_CHANGE_TX, bchannel->b_tx_gain, "DSP-TX_GAIN", bchannel->b_tx_gain, bchannel->b_mode);
 219         if (bchannel->b_rx_gain)
 220                 ph_control(handle, DSP_VOL_CHANGE_RX, bchannel->b_rx_gain, "DSP-RX_GAIN", bchannel->b_rx_gain, bchannel->b_mode);
 221         if (bchannel->b_pipeline[0])
 222                 ph_control_block(handle, DSP_PIPELINE_CFG, bchannel->b_pipeline, strlen(bchannel->b_pipeline)+1, "DSP-PIPELINE", 0, bchannel->b_mode);
 223         if (bchannel->b_conf)
 224                 ph_control(handle, DSP_CONF_JOIN, bchannel->b_conf, "DSP-CONF", bchannel->b_conf, bchannel->b_mode);
 225         if (bchannel->b_echo)
 226                 ph_control(handle, DSP_ECHO_ON, 0, "DSP-ECHO", 1, bchannel->b_mode);
 227         if (bchannel->b_tone)
 228                 ph_control(handle, DSP_TONE_PATT_ON, bchannel->b_tone, "DSP-TONE", bchannel->b_tone, bchannel->b_mode);
 229         if (bchannel->b_rxoff)
 230                 ph_control(handle, DSP_RECEIVE_OFF, 0, "DSP-RXOFF", 1, bchannel->b_mode);
 231 //      if (bchannel->b_txmix)
 232 //              ph_control(handle, DSP_MIX_ON, 0, "DSP-MIX", 1, bchannel->b_mode);
 233         if (bchannel->b_dtmf)
 234                 ph_control(handle, DTMF_TONE_START, 0, "DSP-DTMF", 1, bchannel->b_mode);
 235         if (bchannel->b_bf_len)
 236                 ph_control_block(handle, DSP_BF_ENABLE_KEY, bchannel->b_bf_key, bchannel->b_bf_len, "DSP-CRYPT", bchannel->b_bf_len, bchannel->b_mode);
 237         if (bchannel->b_conf)
 238                 ph_control(handle, DSP_CONF_JOIN, bchannel->b_conf, "DSP-CONF", bchannel->b_conf, bchannel->b_mode);
 239
 240         bchannel->b_state = BSTATE_ACTIVE;
 241 }
 242
 243 /*
 244  * destroy stack
 245  */
 246 void bchannel_destroy(struct bchannel *bchannel)
 247 {
 248         if (bchannel->b_sock > -1)
 249         {
 250                 close(bchannel->b_sock);
 251                 bchannel->b_sock = -1;
 252         }
 253         bchannel->b_state = BSTATE_IDLE;
 254 }
 255
 256
 257 /*
 258  * whenever we get audio data from bchannel, we process it here
 259  */
 260 static void bchannel_receive(struct bchannel *bchannel, unsigned char *buffer, int len)
 261 {
 262         struct mISDNhead *hh = (struct mISDNhead *)buffer;
 263         unsigned char *data = buffer + MISDN_HEADER_LEN;
 264         unsigned long cont = *((unsigned long *)data);
 265         struct bchannel *remote_bchannel;
 266         int ret;
 267
 268         if (hh->prim == PH_CONTROL_IND)
 269         {
 270                 if (len < 4)
 271                 {
 272                         CERROR(NULL, NULL, "SHORT READ OF PH_CONTROL INDICATION\n");
 273                         return;
 274                 }
 275                 if ((cont&(~DTMF_TONE_MASK)) == DTMF_TONE_VAL)
 276                 {
 277                         if (bchannel->call)
 278                                 lcr_in_dtmf(bchannel->call, cont & DTMF_TONE_MASK);
 279                         return;
 280                 }
 281                 switch(cont)
 282                 {
 283                         case DSP_BF_REJECT:
 284                         CERROR(NULL, NULL, "Blowfish crypt rejected.\n");
 285                         break;
 286
 287                         case DSP_BF_ACCEPT:
 288                         CDEBUG(NULL, NULL, "Blowfish crypt enabled.\n");
 289                         break;
 290
 291                         default:
 292                         CDEBUG(NULL, NULL, "Unhandled bchannel control 0x%x.\n", cont);
 293                 }
 294                 return;
 295         }
 296         if (hh->prim == PH_DATA_REQ)
 297         {
 298                 if (!bchannel->b_txdata)
 299                 {
 300                         /* if tx is off, it may happen that fifos send us pending informations, we just ignore them */
 301                         CDEBUG(NULL, NULL, "ignoring tx data, because 'txdata' is turned off\n");
 302                         return;
 303                 }
 304                 return;
 305         }
 306         if (hh->prim != PH_DATA_IND && hh->prim != DL_DATA_IND)
 307         {
 308                 CERROR(NULL, NULL, "Bchannel received unknown primitve: 0x%lx\n", hh->prim);
 309                 return;
 310         }
 311         /* if call is bridged and in non-dsp mode */
 312         if (bchannel->b_conf
 313          && (bchannel->b_mode == 1 || bchannel->b_mode == 3)
 314          && bchannel->call
 315          && bchannel->call->bridge_call
 316          && bchannel->call->bridge_call->bchannel)
 317         {
 318                 remote_bchannel = bchannel->call->bridge_call->bchannel;
 319                 if (remote_bchannel->b_mode == 1 || remote_bchannel->b_mode == 3)
 320                 {
 321                         hh->prim = PH_DATA_REQ;
 322                         ret = sendto(remote_bchannel->b_sock, buffer, MISDN_HEADER_LEN+len, 0, NULL, 0);
 323                         if (ret < 0)
 324                                 CERROR(NULL, NULL, "Failed to send to socket %d\n", bchannel->b_sock);
 325                         return;
 326                 }
 327         }
 328         /* calls will not process any audio data unless
 329          * the call is connected OR interface features audio during call setup.
 330          */
 331
 332         /* if rx is off, it may happen that fifos send us pending informations, we just ignore them */
 333         if (bchannel->b_rxoff)
 334         {
 335                 CDEBUG(NULL, NULL, "ignoring data, because rx is turned off\n");
 336                 return;
 337         }
 338
 339         if (!bchannel->call)
 340         {
 341                 CDEBUG(NULL, NULL, "ignoring data, because no call associated with bchannel\n");
 342                 return;
 343         }
 344         if (!bchannel->call->audiopath)
 345         {
 346                 /* return, because we have no audio from port */
 347                 return;
 348         }
 349         if (bchannel->call->pipe[1] > -1)
 350         {
 351                 len = write(bchannel->call->pipe[1], data, len);
 352                 if (len < 0)
 353                 {
 354                         close(bchannel->call->pipe[1]);
 355                         bchannel->call->pipe[1] = -1;
 356                         CDEBUG(NULL, NULL, "broken pipe on bchannel pipe\n");
 357                         return;
 358                 }
 359         }
 360 }
 361
 362
 363 /*
 364  * transmit data to bchannel
 365  */
 366 void bchannel_transmit(struct bchannel *bchannel, unsigned char *data, int len)
 367 {
 368         unsigned char buff[1024 + MISDN_HEADER_LEN], *p = buff + MISDN_HEADER_LEN;
 369         struct mISDNhead *frm = (struct mISDNhead *)buff;
 370         int ret;
 371         int i;
 372
 373         if (bchannel->b_state != BSTATE_ACTIVE)
 374                 return;
 375         if (len > 1024 || len < 1)
 376                 return;
 377         for (i = 0; i < len; i++)
 378                 *p++ = flip_bits[*data++];
 379         switch(bchannel->b_mode)
 380         {
 381                 case 0:
 382                 case 2:
 383                 frm->prim = DL_DATA_REQ;
 384                 break;
 385                 case 1:
 386                 case 3:
 387                 frm->prim = PH_DATA_REQ;
 388                 break;
 389         }
 390         frm->id = 0;
 391         ret = sendto(bchannel->b_sock, buff, MISDN_HEADER_LEN+len, 0, NULL, 0);
 392         if (ret < 0)
 393                 CERROR(NULL, NULL, "Failed to send to socket %d\n", bchannel->b_sock);
 394 }
 395
 396
 397 /*
 398  * join bchannel
 399  */
 400 void bchannel_join(struct bchannel *bchannel, unsigned short id)
 401 {
 402         int handle;
 403
 404         handle = bchannel->b_sock;
 405         if (id) {
 406                 bchannel->b_conf = (id<<16) + bchannel_pid;
 407                 bchannel->b_rxoff = 1;
 408         } else {
 409                 bchannel->b_conf = 0;
 410                 bchannel->b_rxoff = 0;
 411         }
 412         if (bchannel->b_state == BSTATE_ACTIVE)
 413         {
 414                 ph_control(handle, DSP_RECEIVE_OFF, bchannel->b_rxoff, "DSP-RX_OFF", bchannel->b_conf, bchannel->b_mode);
 415                 ph_control(handle, DSP_CONF_JOIN, bchannel->b_conf, "DSP-CONF", bchannel->b_conf, bchannel->b_mode);
 416         }
 417 }
 418
 419
 420 /*
 421  * dtmf bchannel
 422  */
 423 void bchannel_dtmf(struct bchannel *bchannel, int on)
 424 {
 425         int handle;
 426
 427         handle = bchannel->b_sock;
 428         bchannel->b_dtmf = 1;
 429         if (bchannel->b_state == BSTATE_ACTIVE)
 430                 ph_control(handle, on?DTMF_TONE_START:DTMF_TONE_STOP, 0, "DSP-DTMF", 1, bchannel->b_mode);
 431 }
 432
 433
 434 /*
 435  * blowfish bchannel
 436  */
 437 void bchannel_blowfish(struct bchannel *bchannel, unsigned char *key, int len)
 438 {
 439         int handle;
 440
 441         handle = bchannel->b_sock;
 442         memcpy(bchannel->b_bf_key, key, len);
 443         bchannel->b_bf_len = len;
 444         if (bchannel->b_state == BSTATE_ACTIVE)
 445                 ph_control_block(handle, DSP_BF_ENABLE_KEY, bchannel->b_bf_key, bchannel->b_bf_len, "DSP-CRYPT", bchannel->b_bf_len, bchannel->b_mode);
 446 }
 447
 448
 449 /*
 450  * pipeline bchannel
 451  */
 452 void bchannel_pipeline(struct bchannel *bchannel, char *pipeline)
 453 {
 454         int handle;
 455
 456         handle = bchannel->b_sock;
 457         strncpy(bchannel->b_pipeline, pipeline, sizeof(bchannel->b_pipeline)-1);
 458         if (bchannel->b_state == BSTATE_ACTIVE)
 459                 ph_control_block(handle, DSP_PIPELINE_CFG, bchannel->b_pipeline, strlen(bchannel->b_pipeline)+1, "DSP-PIPELINE", 0, bchannel->b_mode);
 460 }
 461
 462
 463 /*
 464  * gain bchannel
 465  */
 466 void bchannel_gain(struct bchannel *bchannel, int gain, int tx)
 467 {
 468         int handle;
 469
 470         handle = bchannel->b_sock;
 471         if (tx)
 472                 bchannel->b_tx_gain = gain;
 473         else
 474                 bchannel->b_rx_gain = gain;
 475         if (bchannel->b_state == BSTATE_ACTIVE)
 476                 ph_control(handle, (tx)?DSP_VOL_CHANGE_TX:DSP_VOL_CHANGE_RX, gain, (tx)?"DSP-TX_GAIN":"DSP-RX_GAIN", gain, bchannel->b_mode);
 477 }
 478
 479
 480 /*
 481  * main loop for processing messages from mISDN
 482  */
 483 int bchannel_handle(void)
 484 {
 485         int ret, work = 0;
 486         struct bchannel *bchannel;
 487         char buffer[2048+MISDN_HEADER_LEN];
 488         struct mISDNhead *hh = (struct mISDNhead *)buffer;
 489
 490         /* process all bchannels */
 491         bchannel = bchannel_first;
 492         while(bchannel)
 493         {
 494                 /* handle message from bchannel */
 495                 if (bchannel->b_sock > -1)
 496                 {
 497                         ret = recv(bchannel->b_sock, buffer, sizeof(buffer), 0);
 498                         if (ret >= (int)MISDN_HEADER_LEN)
 499                         {
 500                                 work = 1;
 501                                 switch(hh->prim)
 502                                 {
 503                                         /* we don't care about confirms, we use rx data to sync tx */
 504                                         case PH_DATA_CNF:
 505                                         break;
 506
 507                                         /* we receive audio data, we respond to it AND we send tones */
 508                                         case PH_DATA_IND:
 509                                         case PH_DATA_REQ:
 510                                         case DL_DATA_IND:
 511                                         case PH_CONTROL_IND:
 512                                         bchannel_receive(bchannel, buffer, ret-MISDN_HEADER_LEN);
 513                                         break;
 514
 515                                         case PH_ACTIVATE_IND:
 516                                         case DL_ESTABLISH_IND:
 517                                         case PH_ACTIVATE_CNF:
 518                                         case DL_ESTABLISH_CNF:
 519                                         CDEBUG(NULL, NULL, "DL_ESTABLISH confirm: bchannel is now activated (socket %d).\n", bchannel->b_sock);
 520                                         bchannel_activated(bchannel);
 521                                         break;
 522
 523                                         case PH_DEACTIVATE_IND:
 524                                         case DL_RELEASE_IND:
 525                                         case PH_DEACTIVATE_CNF:
 526                                         case DL_RELEASE_CNF:
 527                                         CDEBUG(NULL, NULL, "DL_RELEASE confirm: bchannel is now de-activated (socket %d).\n", bchannel->b_sock);
 528 //                                      bchannel_deactivated(bchannel);
 529                                         break;
 530
 531                                         default:
 532                                         CERROR(NULL, NULL, "child message not handled: prim(0x%x) socket(%d) data len(%d)\n", hh->prim, bchannel->b_sock, ret - MISDN_HEADER_LEN);
 533                                 }
 534                         } else
 535                         {
 536                                 if (ret < 0 && errno != EWOULDBLOCK)
 537                                         CERROR(NULL, NULL, "Read from socket %d failed with return code %d\n", bchannel->b_sock, ret);
 538                         }
 539                 }
 540                 bchannel = bchannel->next;
 541         }
 542
 543         /* if we received at least one b-frame, we will return 1 */
 544         return(work);
 545 }
 546
 547
 548 /*
 549  * bchannel channel handling
 550  */
 551 struct bchannel *bchannel_first = NULL;
 552 struct bchannel *find_bchannel_handle(unsigned long handle)
 553 {
 554         struct bchannel *bchannel = bchannel_first;
 555
 556         while(bchannel)
 557         {
 558                 if (bchannel->handle == handle)
 559                         break;
 560                 bchannel = bchannel->next;
 561         }
 562         return(bchannel);
 563 }
 564
 565 #if 0
 566 struct bchannel *find_bchannel_ref(unsigned long ref)
 567 {
 568         struct bchannel *bchannel = bchannel_first;
 569
 570         while(bchannel)
 571         {
 572                 if (bchannel->ref == ref)
 573                         break;
 574                 bchannel = bchannel->next;
 575         }
 576         return(bchannel);
 577 }
 578 #endif
 579
 580 struct bchannel *alloc_bchannel(unsigned long handle)
 581 {
 582         struct bchannel **bchannelp = &bchannel_first;
 583
 584         while(*bchannelp)
 585                 bchannelp = &((*bchannelp)->next);
 586
 587         *bchannelp = (struct bchannel *)calloc(1, sizeof(struct bchannel));
 588         if (!*bchannelp)
 589                 return(NULL);
 590         (*bchannelp)->handle = handle;
 591         (*bchannelp)->b_state = BSTATE_IDLE;
 592
 593         return(*bchannelp);
 594 }
 595
 596 void free_bchannel(struct bchannel *bchannel)
 597 {
 598         struct bchannel **temp = &bchannel_first;
 599
 600         while(*temp)
 601         {
 602                 if (*temp == bchannel)
 603                 {
 604                         *temp = (*temp)->next;
 605                         if (bchannel->b_sock > -1)
 606                                 bchannel_destroy(bchannel);
 607                         if (bchannel->call)
 608                         {
 609                                 if (bchannel->call->bchannel)
 610                                         bchannel->call->bchannel = NULL;
 611                         }
 612                         free(bchannel);
 613                         return;
 614                 }
 615                 temp = &((*temp)->next);
 616         }
 617 }
 618
 619