Merge major BSD mutex and symbol conflict patches (bug #1816) (link patch still pending)
[asterisk/asterisk.git] / channels / chan_zap.c
1 /*
2  * Asterisk -- A telephony toolkit for Linux.
3  *
4  * Zaptel Pseudo TDM interface 
5  * 
6  * Copyright (C) 2003 Digium
7  *
8  * Mark Spencer <markster@digium.com>
9  *
10  * This program is free software, distributed under the terms of
11  * the GNU General Public License
12  */
13
14 #include <stdio.h>
15 #include <string.h>
16 #include <asterisk/lock.h>
17 #include <asterisk/channel.h>
18 #include <asterisk/channel_pvt.h>
19 #include <asterisk/config.h>
20 #include <asterisk/logger.h>
21 #include <asterisk/module.h>
22 #include <asterisk/pbx.h>
23 #include <asterisk/options.h>
24 #include <asterisk/file.h>
25 #include <asterisk/ulaw.h>
26 #include <asterisk/alaw.h>
27 #include <asterisk/callerid.h>
28 #include <asterisk/adsi.h>
29 #include <asterisk/cli.h>
30 #include <asterisk/cdr.h>
31 #include <asterisk/parking.h>
32 #include <asterisk/musiconhold.h>
33 #include <asterisk/say.h>
34 #include <asterisk/tdd.h>
35 #include <asterisk/app.h>
36 #include <asterisk/dsp.h>
37 #include <asterisk/astdb.h>
38 #include <asterisk/manager.h>
39 #include <asterisk/causes.h>
40 #include <asterisk/term.h>
41 #include <asterisk/utils.h>
42 #include <sys/signal.h>
43 #include <errno.h>
44 #include <stdlib.h>
45 #include <stdint.h>
46 #include <unistd.h>
47 #include <sys/ioctl.h>
48 #ifdef __linux__
49 #include <linux/zaptel.h>
50 #else
51 #include <zaptel.h>
52 #endif /* __linux__ */
53 #include <math.h>
54 #include <tonezone.h>
55 #include <ctype.h>
56 #ifdef ZAPATA_PRI
57 #include <libpri.h>
58 #ifndef PRI_SETUP_CALL
59 #error "You need newer libpri"
60 #endif
61 #endif
62 #ifdef ZAPATA_R2
63 #include <libmfcr2.h>
64 #endif
65
66 #include "../asterisk.h"
67
68 #ifndef ZT_SIG_EM_E1
69 #error "Your zaptel is too old.  please cvs update"
70 #endif
71
72 /*
73  * Define ZHONE_HACK to cause us to go off hook and then back on hook when
74  * the user hangs up to reset the state machine so ring works properly.
75  * This is used to be able to support kewlstart by putting the zhone in
76  * groundstart mode since their forward disconnect supervision is entirely
77  * broken even though their documentation says it isn't and their support
78  * is entirely unwilling to provide any assistance with their channel banks
79  * even though their web site says they support their products for life.
80  */
81
82 /* #define ZHONE_HACK */
83
84 /* Typically, how many rings before we should send Caller*ID */
85 #define DEFAULT_CIDRINGS 1
86
87 #define CHANNEL_PSEUDO -12
88
89 #define AST_LAW(p) (((p)->law == ZT_LAW_ALAW) ? AST_FORMAT_ALAW : AST_FORMAT_ULAW)
90
91 static char *desc = "Zapata Telephony"
92 #ifdef ZAPATA_PRI
93                " w/PRI"
94 #endif
95 #ifdef ZAPATA_R2
96                " w/R2"
97 #endif
98 ;
99
100 static char *tdesc = "Zapata Telephony Driver"
101 #ifdef ZAPATA_PRI
102                " w/PRI"
103 #endif
104 #ifdef ZAPATA_R2
105                " w/R2"
106 #endif
107 ;
108
109 static char *type = "Zap";
110 static char *typecompat = "Tor";        /* Retain compatibility with chan_tor */
111 static char *config = "zapata.conf";
112
113 #define SIG_EM          ZT_SIG_EM
114 #define SIG_EMWINK      (0x100000 | ZT_SIG_EM)
115 #define SIG_FEATD       (0x200000 | ZT_SIG_EM)
116 #define SIG_FEATDMF     (0x400000 | ZT_SIG_EM)
117 #define SIG_FEATB       (0x800000 | ZT_SIG_EM)
118 #define SIG_E911        (0x1000000 | ZT_SIG_EM)
119 #define SIG_FXSLS       ZT_SIG_FXSLS
120 #define SIG_FXSGS       ZT_SIG_FXSGS
121 #define SIG_FXSKS       ZT_SIG_FXSKS
122 #define SIG_FXOLS       ZT_SIG_FXOLS
123 #define SIG_FXOGS       ZT_SIG_FXOGS
124 #define SIG_FXOKS       ZT_SIG_FXOKS
125 #define SIG_PRI         ZT_SIG_CLEAR
126 #define SIG_R2          ZT_SIG_CAS
127 #define SIG_SF          ZT_SIG_SF
128 #define SIG_SFWINK      (0x100000 | ZT_SIG_SF)
129 #define SIG_SF_FEATD    (0x200000 | ZT_SIG_SF)
130 #define SIG_SF_FEATDMF  (0x400000 | ZT_SIG_SF)
131 #define SIG_SF_FEATB    (0x800000 | ZT_SIG_SF)
132 #define SIG_EM_E1       ZT_SIG_EM_E1
133 #define SIG_GR303FXOKS   (0x100000 | ZT_SIG_FXOKS)
134
135 #define NUM_SPANS       32
136 #define NUM_DCHANS      4               /* No more than 4 d-channels */
137 #define MAX_CHANNELS    672     /* No more than a DS3 per trunk group */
138 #define RESET_INTERVAL  3600    /* How often (in seconds) to reset unused channels */
139
140 #define CHAN_PSEUDO     -2
141
142 #define DCHAN_PROVISIONED (1 << 0)
143 #define DCHAN_NOTINALARM  (1 << 1)
144 #define DCHAN_UP          (1 << 2)
145
146 #define DCHAN_AVAILABLE (DCHAN_PROVISIONED | DCHAN_NOTINALARM | DCHAN_UP)
147
148 static char context[AST_MAX_EXTENSION] = "default";
149 static char callerid[256] = "";
150
151 static char language[MAX_LANGUAGE] = "";
152 static char musicclass[MAX_LANGUAGE] = "";
153 static char progzone[10]= "";
154
155 static int usedistinctiveringdetection = 0;
156
157 static int use_callerid = 1;
158 static int zaptrcallerid = 0;
159 static int cur_signalling = -1;
160
161 static unsigned int cur_group = 0;
162 static unsigned int cur_callergroup = 0;
163 static unsigned int cur_pickupgroup = 0;
164 static int relaxdtmf = 0;
165
166 static int immediate = 0;
167
168 static int stripmsd = 0;
169
170 static int callwaiting = 0;
171
172 static int callwaitingcallerid = 0;
173
174 static int hidecallerid = 0;
175
176 static int restrictcid = 0;
177
178 static int use_callingpres = 0;
179
180 static int callreturn = 0;
181
182 static int threewaycalling = 0;
183
184 static int transfer = 0;
185
186 static int cancallforward = 0;
187
188 static float rxgain = 0.0;
189
190 static float txgain = 0.0;
191
192 static int tonezone = -1;
193
194 static int echocancel;
195
196 static int echotraining;
197
198 static int echocanbridged = 0;
199
200 static int busydetect = 0;
201
202 static int busycount = 3;
203
204 static int callprogress = 0;
205
206 static char accountcode[20] = "";
207
208 static char mailbox[AST_MAX_EXTENSION];
209
210 static int amaflags = 0;
211
212 static int adsi = 0;
213
214 static int numbufs = 4;
215
216 static int cur_prewink = -1;
217 static int cur_preflash = -1;
218 static int cur_wink = -1;
219 static int cur_flash = -1;
220 static int cur_start = -1;
221 static int cur_rxwink = -1;
222 static int cur_rxflash = -1;
223 static int cur_debounce = -1;
224
225 #ifdef ZAPATA_PRI
226 static int minunused = 2;
227 static int minidle = 0;
228 static char idleext[AST_MAX_EXTENSION];
229 static char idledial[AST_MAX_EXTENSION];
230 static int overlapdial = 0;
231 static struct ast_channel inuse = { "GR-303InUse" };
232 #endif
233
234 /* Wait up to 16 seconds for first digit (FXO logic) */
235 static int firstdigittimeout = 16000;
236
237 /* How long to wait for following digits (FXO logic) */
238 static int gendigittimeout = 8000;
239
240 /* How long to wait for an extra digit, if there is an ambiguous match */
241 static int matchdigittimeout = 3000;
242
243 static int usecnt =0;
244 AST_MUTEX_DEFINE_STATIC(usecnt_lock);
245
246 /* Protect the interface list (of zt_pvt's) */
247 AST_MUTEX_DEFINE_STATIC(iflock);
248
249 static int ifcount = 0;
250
251 /* Protect the monitoring thread, so only one process can kill or start it, and not
252    when it's doing something critical. */
253 AST_MUTEX_DEFINE_STATIC(monlock);
254
255 /* This is the thread for the monitor which checks for input on the channels
256    which are not currently in use.  */
257 static pthread_t monitor_thread = AST_PTHREADT_NULL;
258
259 static int restart_monitor(void);
260
261 static int zt_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags, struct ast_frame **fo, struct ast_channel **rc);
262
263 static int zt_sendtext(struct ast_channel *c, char *text);
264
265 static inline int zt_get_event(int fd)
266 {
267         /* Avoid the silly zt_getevent which ignores a bunch of events */
268         int j;
269         if (ioctl(fd, ZT_GETEVENT, &j) == -1) return -1;
270         return j;
271 }
272
273 static inline int zt_wait_event(int fd)
274 {
275         /* Avoid the silly zt_waitevent which ignores a bunch of events */
276         int i,j=0;
277         i = ZT_IOMUX_SIGEVENT;
278         if (ioctl(fd, ZT_IOMUX, &i) == -1) return -1;
279         if (ioctl(fd, ZT_GETEVENT, &j) == -1) return -1;
280         return j;
281 }
282
283 /* Chunk size to read -- we use 20ms chunks to make things happy.  */   
284 #define READ_SIZE 160
285
286 #define MASK_AVAIL              (1 << 0)                /* Channel available for PRI use */
287 #define MASK_INUSE              (1 << 1)                /* Channel currently in use */
288
289 #define CALLWAITING_SILENT_SAMPLES      ( (300 * 8) / READ_SIZE) /* 300 ms */
290 #define CALLWAITING_REPEAT_SAMPLES      ( (10000 * 8) / READ_SIZE) /* 300 ms */
291 #define CIDCW_EXPIRE_SAMPLES            ( (500 * 8) / READ_SIZE) /* 500 ms */
292 #define MIN_MS_SINCE_FLASH                      ( (2000) )      /* 2000 ms */
293 #define RINGT                                           ( (8000 * 8) / READ_SIZE)
294
295 struct zt_pvt;
296
297
298 #ifdef ZAPATA_R2
299 static int r2prot = -1;
300 #endif
301
302
303 #ifdef ZAPATA_PRI
304
305 #define PVT_TO_CHANNEL(p) (((p)->prioffset) | ((p)->logicalspan << 8))
306 #define PRI_CHANNEL(p) ((p) & 0xff)
307 #define PRI_SPAN(p) (((p) >> 8) & 0xff)
308
309 struct zt_pri {
310         pthread_t master;                       /* Thread of master */
311         ast_mutex_t lock;               /* Mutex */
312         char idleext[AST_MAX_EXTENSION];                /* Where to idle extra calls */
313         char idlecontext[AST_MAX_EXTENSION];            /* What context to use for idle */
314         char idledial[AST_MAX_EXTENSION];               /* What to dial before dumping */
315         int minunused;                          /* Min # of channels to keep empty */
316         int minidle;                            /* Min # of "idling" calls to keep active */
317         int nodetype;                           /* Node type */
318         int switchtype;                         /* Type of switch to emulate */
319         int dialplan;                   /* Dialing plan */
320         int dchannels[NUM_DCHANS];      /* What channel are the dchannels on */
321         int trunkgroup;                 /* What our trunkgroup is */
322         int mastertrunkgroup;   /* What trunk group is our master */
323         int prilogicalspan;             /* Logical span number within trunk group */
324         int numchans;                   /* Num of channels we represent */
325         int overlapdial;                /* In overlap dialing mode */
326         struct pri *dchans[NUM_DCHANS]; /* Actual d-channels */
327         int dchanavail[NUM_DCHANS];             /* Whether each channel is available */
328         struct pri *pri;                                /* Currently active D-channel */
329         int debug;
330         int fds[NUM_DCHANS];    /* FD's for d-channels */
331         int offset;
332         int span;
333         int resetting;
334         int resetpos;
335         time_t lastreset;
336         struct zt_pvt *pvts[MAX_CHANNELS];      /* Member channel pvt structs */
337         struct zt_pvt *crvs;                            /* Member CRV structs */
338         struct zt_pvt *crvend;                          /* Pointer to end of CRV structs */
339 };
340
341
342 static struct zt_pri pris[NUM_SPANS];
343
344 static int pritype = PRI_CPE;
345
346 #if 0
347 #define DEFAULT_PRI_DEBUG (PRI_DEBUG_Q931_DUMP | PRI_DEBUG_Q921_DUMP | PRI_DEBUG_Q921_RAW | PRI_DEBUG_Q921_STATE)
348 #else
349 #define DEFAULT_PRI_DEBUG 0
350 #endif
351
352 static inline void pri_rel(struct zt_pri *pri)
353 {
354         ast_mutex_unlock(&pri->lock);
355 }
356
357 static int switchtype = PRI_SWITCH_NI2;
358 static int dialplan = PRI_NATIONAL_ISDN + 1;
359
360 #else
361 /* Shut up the compiler */
362 struct zt_pri;
363 #endif
364
365 #define SUB_REAL                0                       /* Active call */
366 #define SUB_CALLWAIT    1                       /* Call-Waiting call on hold */
367 #define SUB_THREEWAY    2                       /* Three-way call */
368
369
370 static struct zt_distRings drings;
371
372 struct distRingData {
373         int ring[3];
374 };
375 struct ringContextData {
376         char contextData[AST_MAX_EXTENSION];
377 };
378 struct zt_distRings {
379         struct distRingData ringnum[3];
380         struct ringContextData ringContext[3];
381 };
382
383 static char *subnames[] = {
384         "Real",
385         "Callwait",
386         "Threeway"
387 };
388
389 struct zt_subchannel {
390         int zfd;
391         struct ast_channel *owner;
392         int chan;
393         short buffer[AST_FRIENDLY_OFFSET/2 + READ_SIZE];
394         struct ast_frame f;             /* One frame for each channel.  How did this ever work before? */
395         int needringing;
396         int needbusy;
397         int needcongestion;
398         int needcallerid;
399         int needanswer;
400         int linear;
401         int inthreeway;
402         ZT_CONFINFO curconf;
403 };
404
405 #define CONF_USER_REAL          (1 << 0)
406 #define CONF_USER_THIRDCALL     (1 << 1)
407
408 #define MAX_SLAVES      4
409
410 static struct zt_pvt {
411         ast_mutex_t lock;
412         struct ast_channel *owner;      /* Our current active owner (if applicable) */
413                 /* Up to three channels can be associated with this call */
414                 
415         struct zt_subchannel sub_unused;        /* Just a safety precaution */
416         struct zt_subchannel subs[3];   /* Sub-channels */
417         struct zt_confinfo saveconf;    /* Saved conference info */
418
419         struct zt_pvt *slaves[MAX_SLAVES];      /* Slave to us (follows our conferencing) */
420         struct zt_pvt *master;  /* Master to us (we follow their conferencing) */
421         int inconference;               /* If our real should be in the conference */
422         
423         int sig;                                        /* Signalling style */
424         int radio;                              /* radio type */
425         int firstradio;                         /* first radio flag */
426         float rxgain;
427         float txgain;
428         int tonezone;                           /* tone zone for this chan, or -1 for default */
429         struct zt_pvt *next;                    /* Next channel in list */
430         struct zt_pvt *prev;                    /* Prev channel in list */
431
432         struct zt_distRings drings;
433         int usedistinctiveringdetection;
434
435         char context[AST_MAX_EXTENSION];
436         char defcontext[AST_MAX_EXTENSION];
437         char exten[AST_MAX_EXTENSION];
438         char language[MAX_LANGUAGE];
439         char musicclass[MAX_LANGUAGE];
440         char callerid[AST_MAX_EXTENSION];
441         char lastcallerid[AST_MAX_EXTENSION];
442         char *origcallerid;                     /* malloced original callerid */
443         char callwaitcid[AST_MAX_EXTENSION];
444         char rdnis[AST_MAX_EXTENSION];
445         char dnid[AST_MAX_EXTENSION];
446         unsigned int group;
447         int law;
448         int confno;                                     /* Our conference */
449         int confusers;                          /* Who is using our conference */
450         int propconfno;                         /* Propagated conference number */
451         unsigned int callgroup;
452         unsigned int pickupgroup;
453         int immediate;                          /* Answer before getting digits? */
454         int channel;                            /* Channel Number or CRV */
455         int span;                                       /* Span number */
456         int dialing;
457         time_t guardtime;                       /* Must wait this much time before using for new call */
458         int dialednone;
459         int use_callerid;                       /* Whether or not to use caller id on this channel */
460         int hidecallerid;
461         int callreturn;
462         int permhidecallerid;           /* Whether to hide our outgoing caller ID or not */
463         int restrictcid;                /* Whether restrict the callerid -> only send ANI */
464         int use_callingpres;            /* Whether to use the callingpres the calling switch sends */
465         int callingpres;                /* The value of callling presentation that we're going to use when placing a PRI call */
466         int callwaitingrepeat;          /* How many samples to wait before repeating call waiting */
467         int cidcwexpire;                        /* When to expire our muting for CID/CW */
468         unsigned char *cidspill;
469         int cidpos;
470         int cidlen;
471         int ringt;
472         int stripmsd;
473         int callwaiting;
474         int callwaitcas;
475         int callwaitrings;
476         int echocancel;
477         int echotraining;
478         int echocanbridged;
479         int echocanon;
480         int echobreak;
481         char echorest[10];
482         int permcallwaiting;
483         int callwaitingcallerid;
484         int threewaycalling;
485         int transfer;
486         int digital;
487         int outgoing;
488         int dnd;
489         int busydetect;
490         int busycount;
491         int callprogress;
492         struct timeval flashtime;       /* Last flash-hook time */
493         struct ast_dsp *dsp;
494         int cref;                                       /* Call reference number */
495         ZT_DIAL_OPERATION dop;
496         int destroy;
497         int ignoredtmf;                         
498         int inalarm;
499         char accountcode[20];           /* Account code */
500         int amaflags;                           /* AMA Flags */
501         char didtdd;                    /* flag to say its done it once */
502         struct tdd_state *tdd;          /* TDD flag */
503         int adsi;
504         int cancallforward;
505         char call_forward[AST_MAX_EXTENSION];
506         char mailbox[AST_MAX_EXTENSION];
507         char dialdest[256];
508         int onhooktime;
509         int msgstate;
510         
511         int confirmanswer;              /* Wait for '#' to confirm answer */
512         int distinctivering;    /* Which distinctivering to use */
513         int cidrings;                   /* Which ring to deliver CID on */
514         
515         int faxhandled;                 /* Has a fax tone already been handled? */
516         
517         char mate;                      /* flag to say its in MATE mode */
518         int pulsedial;          /* whether a pulse dial phone is detected */
519         int dtmfrelax;          /* whether to run in relaxed DTMF mode */
520         int fake_event;
521         int zaptrcallerid;      /* should we use the callerid from incoming call on zap transfer or not */
522 #ifdef ZAPATA_PRI
523         struct zt_pri *pri;
524         struct zt_pvt *bearer;
525         struct zt_pvt *realcall;
526         q931_call *call;
527         int isidlecall;
528         int resetting;
529         int prioffset;
530         int logicalspan;
531         int alreadyhungup;
532         int proceeding;
533         int setup_ack;          /* wheter we received SETUP_ACKNOWLEDGE or not */
534 #endif  
535 #ifdef ZAPATA_R2
536         int r2prot;
537         mfcr2_t *r2;
538         int hasr2call;
539         int r2blocked;
540         int sigchecked;
541 #endif  
542 } *iflist = NULL, *ifend = NULL;
543
544 struct zt_pvt *round_robin[32];
545
546 #ifdef ZAPATA_PRI
547 static inline int pri_grab(struct zt_pvt *pvt, struct zt_pri *pri)
548 {
549         int res;
550         /* Grab the lock first */
551         do {
552             res = ast_mutex_trylock(&pri->lock);
553                 if (res) {
554                         ast_mutex_unlock(&pvt->lock);
555                         /* Release the lock and try again */
556                         usleep(1);
557                         ast_mutex_lock(&pvt->lock);
558                 }
559         } while(res);
560         /* Then break the poll */
561         pthread_kill(pri->master, SIGURG);
562         return 0;
563 }
564 #endif
565
566 #define NUM_CADENCE_MAX 25
567 static int num_cadence = 4;
568 static int user_has_defined_cadences = 0;
569
570 static struct zt_ring_cadence cadences[NUM_CADENCE_MAX] = {
571         { { 125, 125, 2000, 4000 } },                   /* Quick chirp followed by normal ring */
572         { { 250, 250, 500, 1000, 250, 250, 500, 4000 } }, /* British style ring */
573         { { 125, 125, 125, 125, 125, 4000 } },  /* Three short bursts */
574         { { 1000, 500, 2500, 5000 } },  /* Long ring */
575 };
576
577 int receivedRingT; /* Used to find out what ringtone we are on */
578
579 /* cidrings says in which pause to transmit the cid information, where the first pause
580  * is 1, the second pause is 2 and so on.
581  */
582
583 static int cidrings[NUM_CADENCE_MAX] = {
584         2,                                                                              /* Right after first long ring */
585         4,                                                                              /* Right after long part */
586         3,                                                                              /* After third chirp */
587         2,                                                                              /* Second spell */
588 };
589
590 #define ISTRUNK(p) ((p->sig == SIG_FXSLS) || (p->sig == SIG_FXSKS) || \
591                         (p->sig == SIG_FXSGS) || (p->sig == SIG_PRI))
592
593 #define CANBUSYDETECT(p) (ISTRUNK(p) || (p->sig & (SIG_EM | SIG_EM_E1 | SIG_SF)) /* || (p->sig & __ZT_SIG_FXO) */)
594 #define CANPROGRESSDETECT(p) (ISTRUNK(p) || (p->sig & (SIG_EM | SIG_EM_E1 | SIG_SF)) /* || (p->sig & __ZT_SIG_FXO) */)
595
596 #ifdef ZAPATA_PRI
597 /* translate between PRI causes and asterisk's */
598 static int hangup_pri2cause(int cause)
599 {
600         switch(cause) {
601                 case PRI_CAUSE_USER_BUSY:
602                         return AST_CAUSE_BUSY;
603                 case PRI_CAUSE_NORMAL_CLEARING:
604                         return AST_CAUSE_NORMAL;
605                 case PRI_CAUSE_NORMAL_CIRCUIT_CONGESTION:
606                 case PRI_CAUSE_REQUESTED_CHAN_UNAVAIL:
607                         return AST_CAUSE_CONGESTION;
608                 case PRI_CAUSE_UNALLOCATED:
609                 case PRI_CAUSE_NUMBER_CHANGED:
610                         return AST_CAUSE_UNALLOCATED;
611                 default:
612                         return AST_CAUSE_FAILURE;
613         }
614         /* never reached */
615         return 0;
616 }
617
618 /* translate between ast cause and PRI */
619 static int hangup_cause2pri(int cause)
620 {
621         switch(cause) {
622                 case AST_CAUSE_BUSY:
623                         return PRI_CAUSE_USER_BUSY;
624                 case AST_CAUSE_UNALLOCATED:
625                         return PRI_CAUSE_UNALLOCATED;
626                 case AST_CAUSE_CONGESTION:
627                         return PRI_CAUSE_NORMAL_CIRCUIT_CONGESTION;
628                 case AST_CAUSE_NORMAL:
629                 default:
630                         return PRI_CAUSE_NORMAL_CLEARING;
631         }
632         /* never reached */
633         return 0;
634 }
635 #endif
636
637 static int zt_get_index(struct ast_channel *ast, struct zt_pvt *p, int nullok)
638 {
639         int res;
640         if (p->subs[0].owner == ast)
641                 res = 0;
642         else if (p->subs[1].owner == ast)
643                 res = 1;
644         else if (p->subs[2].owner == ast)
645                 res = 2;
646         else {
647                 res = -1;
648                 if (!nullok)
649                         ast_log(LOG_WARNING, "Unable to get index, and nullok is not asserted\n");
650         }
651         return res;
652 }
653
654 static void wakeup_sub(struct zt_pvt *p, int a)
655 {
656         struct ast_frame null = { AST_FRAME_NULL, };
657         for (;;) {
658                 if (p->subs[a].owner) {
659                         if (ast_mutex_trylock(&p->subs[a].owner->lock)) {
660                                 ast_mutex_unlock(&p->lock);
661                                 usleep(1);
662                                 ast_mutex_lock(&p->lock);
663                         } else {
664                                 ast_queue_frame(p->subs[a].owner, &null);
665                                 ast_mutex_unlock(&p->subs[a].owner->lock);
666                                 break;
667                         }
668                 } else
669                         break;
670         }
671 }
672
673 static void zap_queue_frame(struct zt_pvt *p, struct ast_frame *f)
674 {
675         for (;;) {
676                 if (p->owner) {
677                         if (ast_mutex_trylock(&p->owner->lock)) {
678                                 ast_mutex_unlock(&p->lock);
679                                 usleep(1);
680                                 ast_mutex_lock(&p->lock);
681                         } else {
682                                 ast_queue_frame(p->owner, f);
683                                 ast_mutex_unlock(&p->owner->lock);
684                                 break;
685                         }
686                 } else
687                         break;
688         }
689 }
690
691 static void swap_subs(struct zt_pvt *p, int a, int b)
692 {
693         int tchan;
694         int tinthreeway;
695         struct ast_channel *towner;
696
697         ast_log(LOG_DEBUG, "Swapping %d and %d\n", a, b);
698
699         tchan = p->subs[a].chan;
700         towner = p->subs[a].owner;
701         tinthreeway = p->subs[a].inthreeway;
702
703         p->subs[a].chan = p->subs[b].chan;
704         p->subs[a].owner = p->subs[b].owner;
705         p->subs[a].inthreeway = p->subs[b].inthreeway;
706
707         p->subs[b].chan = tchan;
708         p->subs[b].owner = towner;
709         p->subs[b].inthreeway = tinthreeway;
710
711         if (p->subs[a].owner) 
712                 p->subs[a].owner->fds[0] = p->subs[a].zfd;
713         if (p->subs[b].owner) 
714                 p->subs[b].owner->fds[0] = p->subs[b].zfd;
715         wakeup_sub(p, a);
716         wakeup_sub(p, b);
717 }
718
719 static int zt_open(char *fn)
720 {
721         int fd;
722         int isnum;
723         int chan = 0;
724         int bs;
725         int x;
726         isnum = 1;
727         for (x=0;x<strlen(fn);x++) {
728                 if (!isdigit(fn[x])) {
729                         isnum = 0;
730                         break;
731                 }
732         }
733         if (isnum) {
734                 chan = atoi(fn);
735                 if (chan < 1) {
736                         ast_log(LOG_WARNING, "Invalid channel number '%s'\n", fn);
737                         return -1;
738                 }
739                 fn = "/dev/zap/channel";
740         }
741         fd = open(fn, O_RDWR | O_NONBLOCK);
742         if (fd < 0) {
743                 ast_log(LOG_WARNING, "Unable to open '%s': %s\n", fn, strerror(errno));
744                 return -1;
745         }
746         if (chan) {
747                 if (ioctl(fd, ZT_SPECIFY, &chan)) {
748                         x = errno;
749                         close(fd);
750                         errno = x;
751                         ast_log(LOG_WARNING, "Unable to specify channel %d: %s\n", chan, strerror(errno));
752                         return -1;
753                 }
754         }
755         bs = READ_SIZE;
756         if (ioctl(fd, ZT_SET_BLOCKSIZE, &bs) == -1) return -1;
757         return fd;
758 }
759
760 static void zt_close(int fd)
761 {
762         close(fd);
763 }
764
765 int zt_setlinear(int zfd, int linear)
766 {
767         int res;
768         res = ioctl(zfd, ZT_SETLINEAR, &linear);
769         if (res)
770                 return res;
771         return 0;
772 }
773
774
775 int zt_setlaw(int zfd, int law)
776 {
777         int res;
778         res = ioctl(zfd, ZT_SETLAW, &law);
779         if (res)
780                 return res;
781         return 0;
782 }
783
784 static int alloc_sub(struct zt_pvt *p, int x)
785 {
786         ZT_BUFFERINFO bi;
787         int res;
788         if (p->subs[x].zfd < 0) {
789                 p->subs[x].zfd = zt_open("/dev/zap/pseudo");
790                 if (p->subs[x].zfd > -1) {
791                         res = ioctl(p->subs[x].zfd, ZT_GET_BUFINFO, &bi);
792                         if (!res) {
793                                 bi.txbufpolicy = ZT_POLICY_IMMEDIATE;
794                                 bi.rxbufpolicy = ZT_POLICY_IMMEDIATE;
795                                 bi.numbufs = numbufs;
796                                 res = ioctl(p->subs[x].zfd, ZT_SET_BUFINFO, &bi);
797                                 if (res < 0) {
798                                         ast_log(LOG_WARNING, "Unable to set buffer policy on channel %d\n", x);
799                                 }
800                         } else 
801                                 ast_log(LOG_WARNING, "Unable to check buffer policy on channel %d\n", x);
802                         if (ioctl(p->subs[x].zfd, ZT_CHANNO, &p->subs[x].chan) == 1) {
803                                 ast_log(LOG_WARNING,"Unable to get channel number for pseudo channel on FD %d\n",p->subs[x].zfd);
804                                 zt_close(p->subs[x].zfd);
805                                 p->subs[x].zfd = -1;
806                                 return -1;
807                         }
808                         if (option_debug)
809                                 ast_log(LOG_DEBUG, "Allocated %s subchannel on FD %d channel %d\n", subnames[x], p->subs[x].zfd, p->subs[x].chan);
810                         return 0;
811                 } else
812                         ast_log(LOG_WARNING, "Unable to open pseudo channel: %s\n", strerror(errno));
813                 return -1;
814         }
815         ast_log(LOG_WARNING, "%s subchannel of %d already in use\n", subnames[x], p->channel);
816         return -1;
817 }
818
819 static int unalloc_sub(struct zt_pvt *p, int x)
820 {
821         if (!x) {
822                 ast_log(LOG_WARNING, "Trying to unalloc the real channel %d?!?\n", p->channel);
823                 return -1;
824         }
825         ast_log(LOG_DEBUG, "Released sub %d of channel %d\n", x, p->channel);
826         if (p->subs[x].zfd > -1) {
827                 zt_close(p->subs[x].zfd);
828         }
829         p->subs[x].zfd = -1;
830         p->subs[x].linear = 0;
831         p->subs[x].chan = 0;
832         p->subs[x].owner = NULL;
833         p->subs[x].inthreeway = 0;
834         memset(&p->subs[x].curconf, 0, sizeof(p->subs[x].curconf));
835         return 0;
836 }
837
838 static int zt_digit(struct ast_channel *ast, char digit)
839 {
840         ZT_DIAL_OPERATION zo;
841         struct zt_pvt *p;
842         int res = 0;
843         int index;
844         p = ast->pvt->pvt;
845         ast_mutex_lock(&p->lock);
846         index = zt_get_index(ast, p, 0);
847         if (index == SUB_REAL) {
848 #ifdef ZAPATA_PRI
849                 if (p->sig == SIG_PRI && ast->_state == AST_STATE_DIALING && (p->proceeding < 2)) {
850                         if (p->setup_ack) {
851                                 if (!pri_grab(p, p->pri)) {
852                                         pri_information(p->pri->pri,p->call,digit);
853                                         pri_rel(p->pri);
854                                 } else
855                                         ast_log(LOG_WARNING, "Unable to grab PRI on span %d\n", p->span);
856                         } else if (strlen(p->dialdest) < sizeof(p->dialdest) - 1) {
857                                 ast_log(LOG_DEBUG, "Queueing digit '%c' since setup_ack not yet received\n", digit);
858                                 res = strlen(p->dialdest);
859                                 p->dialdest[res++] = digit;
860                                 p->dialdest[res] = '\0';
861                         }
862                 } else {
863 #else
864                 {
865 #endif
866                         zo.op = ZT_DIAL_OP_APPEND;
867                         zo.dialstr[0] = 'T';
868                         zo.dialstr[1] = digit;
869                         zo.dialstr[2] = 0;
870                         if ((res = ioctl(p->subs[SUB_REAL].zfd, ZT_DIAL, &zo)))
871                                 ast_log(LOG_WARNING, "Couldn't dial digit %c\n", digit);
872                         else
873                                 p->dialing = 1;
874                 }
875         }
876         ast_mutex_unlock(&p->lock);
877         return res;
878 }
879
880 static char *events[] = {
881         "No event",
882         "On hook",
883         "Ring/Answered",
884         "Wink/Flash",
885         "Alarm",
886         "No more alarm",
887                 "HDLC Abort",
888                 "HDLC Overrun",
889                 "HDLC Bad FCS",
890                 "Dial Complete",
891                 "Ringer On",
892                 "Ringer Off",
893                 "Hook Transition Complete",
894                 "Bits Changed",
895                 "Pulse Start"
896 };
897
898 static struct {
899         int alarm;
900         char *name;
901 } alarms[] = {
902         { ZT_ALARM_RED, "Red Alarm" },
903         { ZT_ALARM_YELLOW, "Yellow Alarm" },
904         { ZT_ALARM_BLUE, "Blue Alarm" },
905         { ZT_ALARM_RECOVER, "Recovering" },
906         { ZT_ALARM_LOOPBACK, "Loopback" },
907         { ZT_ALARM_NOTOPEN, "Not Open" },
908         { ZT_ALARM_NONE, "None" },
909 };
910
911 static char *alarm2str(int alarm)
912 {
913         int x;
914         for (x=0;x<sizeof(alarms) / sizeof(alarms[0]); x++) {
915                 if (alarms[x].alarm & alarm)
916                         return alarms[x].name;
917         }
918         return alarm ? "Unknown Alarm" : "No Alarm";
919 }
920
921 static char *event2str(int event)
922 {
923         static char buf[256];
924         if ((event < 15) && (event > -1))
925                 return events[event];
926         sprintf(buf, "Event %d", event);
927         return buf;
928 }
929
930 #ifdef ZAPATA_R2
931 static int str2r2prot(char *swtype)
932 {
933     if (!strcasecmp(swtype, "ar"))
934         return MFCR2_PROT_ARGENTINA;
935     /*endif*/
936     if (!strcasecmp(swtype, "cn"))
937         return MFCR2_PROT_CHINA;
938     /*endif*/
939     if (!strcasecmp(swtype, "kr"))
940         return MFCR2_PROT_KOREA;
941     /*endif*/
942     return -1;
943 }
944 #endif
945
946 static char *sig2str(int sig)
947 {
948         static char buf[256];
949         switch(sig) {
950         case SIG_EM:
951                 return "E & M Immediate";
952         case SIG_EMWINK:
953                 return "E & M Wink";
954         case SIG_EM_E1:
955                 return "E & M E1";
956         case SIG_FEATD:
957                 return "Feature Group D (DTMF)";
958         case SIG_FEATDMF:
959                 return "Feature Group D (MF)";
960         case SIG_FEATB:
961                 return "Feature Group B (MF)";
962         case SIG_E911:
963                 return "E911 (MF)";
964         case SIG_FXSLS:
965                 return "FXS Loopstart";
966         case SIG_FXSGS:
967                 return "FXS Groundstart";
968         case SIG_FXSKS:
969                 return "FXS Kewlstart";
970         case SIG_FXOLS:
971                 return "FXO Loopstart";
972         case SIG_FXOGS:
973                 return "FXO Groundstart";
974         case SIG_FXOKS:
975                 return "FXO Kewlstart";
976         case SIG_PRI:
977                 return "PRI Signalling";
978         case SIG_R2:
979                 return "R2 Signalling";
980         case SIG_SF:
981                 return "SF (Tone) Signalling Immediate";
982         case SIG_SFWINK:
983                 return "SF (Tone) Signalling Wink";
984         case SIG_SF_FEATD:
985                 return "SF (Tone) Signalling with Feature Group D (DTMF)";
986         case SIG_SF_FEATDMF:
987                 return "SF (Tone) Signalling with Feature Group D (MF)";
988         case SIG_SF_FEATB:
989                 return "SF (Tone) Signalling with Feature Group B (MF)";
990         case SIG_GR303FXOKS:
991                 return "GR-303 Signalling with FXOKS";
992         case 0:
993                 return "Pseudo Signalling";
994         default:
995                 snprintf(buf, sizeof(buf), "Unknown signalling %d", sig);
996                 return buf;
997         }
998 }
999
1000 static int conf_add(struct zt_pvt *p, struct zt_subchannel *c, int index, int slavechannel)
1001 {
1002         /* If the conference already exists, and we're already in it
1003            don't bother doing anything */
1004         ZT_CONFINFO zi;
1005         
1006         memset(&zi, 0, sizeof(zi));
1007         zi.chan = 0;
1008
1009         if (slavechannel > 0) {
1010                 /* If we have only one slave, do a digital mon */
1011                 zi.confmode = ZT_CONF_DIGITALMON;
1012                 zi.confno = slavechannel;
1013         } else {
1014                 if (!index) {
1015                         /* Real-side and pseudo-side both participate in conference */
1016                         zi.confmode = ZT_CONF_REALANDPSEUDO | ZT_CONF_TALKER | ZT_CONF_LISTENER |
1017                                                                 ZT_CONF_PSEUDO_TALKER | ZT_CONF_PSEUDO_LISTENER;
1018                 } else
1019                         zi.confmode = ZT_CONF_CONF | ZT_CONF_TALKER | ZT_CONF_LISTENER;
1020                 zi.confno = p->confno;
1021         }
1022         if ((zi.confno == c->curconf.confno) && (zi.confmode == c->curconf.confmode))
1023                 return 0;
1024         if (c->zfd < 0)
1025                 return 0;
1026         if (ioctl(c->zfd, ZT_SETCONF, &zi)) {
1027                 ast_log(LOG_WARNING, "Failed to add %d to conference %d/%d\n", c->zfd, zi.confmode, zi.confno);
1028                 return -1;
1029         }
1030         if (slavechannel < 1) {
1031                 p->confno = zi.confno;
1032         }
1033         memcpy(&c->curconf, &zi, sizeof(c->curconf));
1034         ast_log(LOG_DEBUG, "Added %d to conference %d/%d\n", c->zfd, c->curconf.confmode, c->curconf.confno);
1035         return 0;
1036 }
1037
1038 static int isourconf(struct zt_pvt *p, struct zt_subchannel *c)
1039 {
1040         /* If they're listening to our channel, they're ours */ 
1041         if ((p->channel == c->curconf.confno) && (c->curconf.confmode == ZT_CONF_DIGITALMON))
1042                 return 1;
1043         /* If they're a talker on our (allocated) conference, they're ours */
1044         if ((p->confno > 0) && (p->confno == c->curconf.confno) && (c->curconf.confmode & ZT_CONF_TALKER))
1045                 return 1;
1046         return 0;
1047 }
1048
1049 static int conf_del(struct zt_pvt *p, struct zt_subchannel *c, int index)
1050 {
1051         ZT_CONFINFO zi;
1052         if (/* Can't delete if there's no zfd */
1053                 (c->zfd < 0) ||
1054                 /* Don't delete from the conference if it's not our conference */
1055                 !isourconf(p, c)
1056                 /* Don't delete if we don't think it's conferenced at all (implied) */
1057                 ) return 0;
1058         memset(&zi, 0, sizeof(zi));
1059         zi.chan = 0;
1060         zi.confno = 0;
1061         zi.confmode = 0;
1062         if (ioctl(c->zfd, ZT_SETCONF, &zi)) {
1063                 ast_log(LOG_WARNING, "Failed to drop %d from conference %d/%d\n", c->zfd, c->curconf.confmode, c->curconf.confno);
1064                 return -1;
1065         }
1066         ast_log(LOG_DEBUG, "Removed %d from conference %d/%d\n", c->zfd, c->curconf.confmode, c->curconf.confno);
1067         memcpy(&c->curconf, &zi, sizeof(c->curconf));
1068         return 0;
1069 }
1070
1071 static int isslavenative(struct zt_pvt *p, struct zt_pvt **out)
1072 {
1073         int x;
1074         int useslavenative;
1075         struct zt_pvt *slave = NULL;
1076         /* Start out optimistic */
1077         useslavenative = 1;
1078         /* Update conference state in a stateless fashion */
1079         for (x=0;x<3;x++) {
1080                 /* Any three-way calling makes slave native mode *definitely* out
1081                    of the question */
1082                 if ((p->subs[x].zfd > -1) && p->subs[x].inthreeway)
1083                         useslavenative = 0;
1084         }
1085         /* If we don't have any 3-way calls, check to see if we have
1086            precisely one slave */
1087         if (useslavenative) {
1088                 for (x=0;x<MAX_SLAVES;x++) {
1089                         if (p->slaves[x]) {
1090                                 if (slave) {
1091                                         /* Whoops already have a slave!  No 
1092                                            slave native and stop right away */
1093                                         slave = NULL;
1094                                         useslavenative = 0;
1095                                         break;
1096                                 } else {
1097                                         /* We have one slave so far */
1098                                         slave = p->slaves[x];
1099                                 }
1100                         }
1101                 }
1102         }
1103         /* If no slave, slave native definitely out */
1104         if (!slave)
1105                 useslavenative = 0;
1106         else if (slave->law != p->law) {
1107                 useslavenative = 0;
1108                 slave = NULL;
1109         }
1110         if (out)
1111                 *out = slave;
1112         return useslavenative;
1113 }
1114
1115 static int update_conf(struct zt_pvt *p)
1116 {
1117         int needconf = 0;
1118         int x;
1119         int useslavenative;
1120         struct zt_pvt *slave = NULL;
1121
1122         useslavenative = isslavenative(p, &slave);
1123         /* Start with the obvious, general stuff */
1124         for (x=0;x<3;x++) {
1125                 /* Look for three way calls */
1126                 if ((p->subs[x].zfd > -1) && p->subs[x].inthreeway) {
1127                         conf_add(p, &p->subs[x], x, 0);
1128                         needconf++;
1129                 } else {
1130                         conf_del(p, &p->subs[x], x);
1131                 }
1132         }
1133         /* If we have a slave, add him to our conference now. or DAX
1134            if this is slave native */
1135         for (x=0;x<MAX_SLAVES;x++) {
1136                 if (p->slaves[x]) {
1137                         if (useslavenative)
1138                                 conf_add(p, &p->slaves[x]->subs[SUB_REAL], SUB_REAL, p->channel);
1139                         else {
1140                                 conf_add(p, &p->slaves[x]->subs[SUB_REAL], SUB_REAL, 0);
1141                                 needconf++;
1142                         }
1143                 }
1144         }
1145         /* If we're supposed to be in there, do so now */
1146         if (p->inconference && !p->subs[SUB_REAL].inthreeway) {
1147                 if (useslavenative)
1148                         conf_add(p, &p->subs[SUB_REAL], SUB_REAL, slave->channel);
1149                 else {
1150                         conf_add(p, &p->subs[SUB_REAL], SUB_REAL, 0);
1151                         needconf++;
1152                 }
1153         }
1154         /* If we have a master, add ourselves to his conference */
1155         if (p->master) {
1156                 if (isslavenative(p->master, NULL)) {
1157                         conf_add(p->master, &p->subs[SUB_REAL], SUB_REAL, p->master->channel);
1158                 } else {
1159                         conf_add(p->master, &p->subs[SUB_REAL], SUB_REAL, 0);
1160                 }
1161         }
1162         if (!needconf) {
1163                 /* Nobody is left (or should be left) in our conference.  
1164                    Kill it.  */
1165                 p->confno = -1;
1166         }
1167         ast_log(LOG_DEBUG, "Updated conferencing on %d, with %d conference users\n", p->channel, needconf);
1168         return 0;
1169 }
1170
1171 static void zt_enable_ec(struct zt_pvt *p)
1172 {
1173         int x;
1174         int res;
1175         if (p->echocanon) {
1176                 ast_log(LOG_DEBUG, "Echo cancellation already on\n");
1177                 return;
1178         }
1179         if (p && p->echocancel) {
1180                 if (p->sig == SIG_PRI) {
1181                         x = 1;
1182                         res = ioctl(p->subs[SUB_REAL].zfd, ZT_AUDIOMODE, &x);
1183                         if (res)
1184                                 ast_log(LOG_WARNING, "Unable to enable echo cancellation on channel %d\n", p->channel);
1185                 }
1186                 x = p->echocancel;
1187                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_ECHOCANCEL, &x);
1188                 if (res) 
1189                         ast_log(LOG_WARNING, "Unable to enable echo cancellation on channel %d\n", p->channel);
1190                 else {
1191                         p->echocanon = 1;
1192                         ast_log(LOG_DEBUG, "Enabled echo cancellation on channel %d\n", p->channel);
1193                 }
1194         } else
1195                 ast_log(LOG_DEBUG, "No echocancellation requested\n");
1196 }
1197
1198 static void zt_train_ec(struct zt_pvt *p)
1199 {
1200         int x;
1201         int res;
1202         if (p && p->echocancel && p->echotraining) {
1203                 x = 400;
1204                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_ECHOTRAIN, &x);
1205                 if (res) 
1206                         ast_log(LOG_WARNING, "Unable to request echo training on channel %d\n", p->channel);
1207                 else {
1208                         ast_log(LOG_DEBUG, "Engaged echo training on channel %d\n", p->channel);
1209                 }
1210         } else
1211                 ast_log(LOG_DEBUG, "No echo training requested\n");
1212 }
1213
1214 static void zt_disable_ec(struct zt_pvt *p)
1215 {
1216         int x;
1217         int res;
1218         if (p->echocancel) {
1219                 x = 0;
1220                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_ECHOCANCEL, &x);
1221                 if (res) 
1222                         ast_log(LOG_WARNING, "Unable to disable echo cancellation on channel %d\n", p->channel);
1223                 else
1224                         ast_log(LOG_DEBUG, "disabled echo cancellation on channel %d\n", p->channel);
1225         }
1226         p->echocanon = 0;
1227 }
1228
1229 int set_actual_gain(int fd, int chan, float rxgain, float txgain, int law)
1230 {
1231         struct  zt_gains g;
1232         float ltxgain;
1233         float lrxgain;
1234         int j,k;
1235         g.chan = chan;
1236         if ((rxgain != 0.0)  || (txgain != 0.0)) {
1237                 /* caluculate linear value of tx gain */
1238                 ltxgain = pow(10.0,txgain / 20.0);
1239                 /* caluculate linear value of rx gain */
1240                 lrxgain = pow(10.0,rxgain / 20.0);
1241                 if (law == ZT_LAW_ALAW) {
1242                         for (j=0;j<256;j++) {
1243                                 k = (int)(((float)AST_ALAW(j)) * lrxgain);
1244                                 if (k > 32767) k = 32767;
1245                                 if (k < -32767) k = -32767;
1246                                 g.rxgain[j] = AST_LIN2A(k);
1247                                 k = (int)(((float)AST_ALAW(j)) * ltxgain);
1248                                 if (k > 32767) k = 32767;
1249                                 if (k < -32767) k = -32767;
1250                                 g.txgain[j] = AST_LIN2A(k);
1251                         }
1252                 } else {
1253                         for (j=0;j<256;j++) {
1254                                 k = (int)(((float)AST_MULAW(j)) * lrxgain);
1255                                 if (k > 32767) k = 32767;
1256                                 if (k < -32767) k = -32767;
1257                                 g.rxgain[j] = AST_LIN2MU(k);
1258                                 k = (int)(((float)AST_MULAW(j)) * ltxgain);
1259                                 if (k > 32767) k = 32767;
1260                                 if (k < -32767) k = -32767;
1261                                 g.txgain[j] = AST_LIN2MU(k);
1262                         }
1263                 }
1264         } else {
1265                 for (j=0;j<256;j++) {
1266                         g.rxgain[j] = j;
1267                         g.txgain[j] = j;
1268                 }
1269         }
1270                 
1271           /* set 'em */
1272         return(ioctl(fd,ZT_SETGAINS,&g));
1273 }
1274
1275 static inline int zt_set_hook(int fd, int hs)
1276 {
1277         int x, res;
1278         x = hs;
1279         res = ioctl(fd, ZT_HOOK, &x);
1280         if (res < 0) 
1281         {
1282                 if (errno == EINPROGRESS) return 0;
1283                 ast_log(LOG_WARNING, "zt hook failed: %s\n", strerror(errno));
1284         }
1285         return res;
1286 }
1287
1288 static inline int zt_confmute(struct zt_pvt *p, int muted)
1289 {
1290         int x, y, res;
1291         x = muted;
1292         if (p->sig == SIG_PRI) {
1293                 y = 1;
1294                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_AUDIOMODE, &y);
1295                 if (res)
1296                         ast_log(LOG_WARNING, "Unable to set audio mode on '%d'\n", p->channel);
1297         }
1298         res = ioctl(p->subs[SUB_REAL].zfd, ZT_CONFMUTE, &x);
1299         if (res < 0) 
1300                 ast_log(LOG_WARNING, "zt confmute(%d) failed on channel %d: %s\n", muted, p->channel, strerror(errno));
1301         return res;
1302 }
1303
1304 static int save_conference(struct zt_pvt *p)
1305 {
1306         struct zt_confinfo c;
1307         int res;
1308         if (p->saveconf.confmode) {
1309                 ast_log(LOG_WARNING, "Can't save conference -- already in use\n");
1310                 return -1;
1311         }
1312         p->saveconf.chan = 0;
1313         res = ioctl(p->subs[SUB_REAL].zfd, ZT_GETCONF, &p->saveconf);
1314         if (res) {
1315                 ast_log(LOG_WARNING, "Unable to get conference info: %s\n", strerror(errno));
1316                 p->saveconf.confmode = 0;
1317                 return -1;
1318         }
1319         c.chan = 0;
1320         c.confno = 0;
1321         c.confmode = ZT_CONF_NORMAL;
1322         res = ioctl(p->subs[SUB_REAL].zfd, ZT_SETCONF, &c);
1323         if (res) {
1324                 ast_log(LOG_WARNING, "Unable to set conference info: %s\n", strerror(errno));
1325                 return -1;
1326         }
1327         if (option_debug)
1328                 ast_log(LOG_DEBUG, "Disabled conferencing\n");
1329         return 0;
1330 }
1331
1332 static int restore_conference(struct zt_pvt *p)
1333 {
1334         int res;
1335         if (p->saveconf.confmode) {
1336                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_SETCONF, &p->saveconf);
1337                 p->saveconf.confmode = 0;
1338                 if (res) {
1339                         ast_log(LOG_WARNING, "Unable to restore conference info: %s\n", strerror(errno));
1340                         return -1;
1341                 }
1342         }
1343         if (option_debug)
1344                 ast_log(LOG_DEBUG, "Restored conferencing\n");
1345         return 0;
1346 }
1347
1348 static int send_callerid(struct zt_pvt *p);
1349
1350 int send_cwcidspill(struct zt_pvt *p)
1351 {
1352         p->callwaitcas = 0;
1353         p->cidcwexpire = 0;
1354         p->cidspill = malloc(MAX_CALLERID_SIZE);
1355         if (p->cidspill) {
1356                 memset(p->cidspill, 0x7f, MAX_CALLERID_SIZE);
1357                 p->cidlen = ast_callerid_callwaiting_generate(p->cidspill, p->callwaitcid, AST_LAW(p));
1358                 /* Make sure we account for the end */
1359                 p->cidlen += READ_SIZE * 4;
1360                 p->cidpos = 0;
1361                 send_callerid(p);
1362                 if (option_verbose > 2)
1363                         ast_verbose(VERBOSE_PREFIX_3 "CPE supports Call Waiting Caller*ID.  Sending '%s'\n", p->callwaitcid);
1364         } else return -1;
1365         return 0;
1366 }
1367
1368 static int has_voicemail(struct zt_pvt *p)
1369 {
1370
1371         return ast_app_has_voicemail(p->mailbox);
1372 }
1373
1374 static int send_callerid(struct zt_pvt *p)
1375 {
1376         /* Assumes spill in p->cidspill, p->cidlen in length and we're p->cidpos into it */
1377         int res;
1378         /* Take out of linear mode if necessary */
1379         if (p->subs[SUB_REAL].linear) {
1380                 p->subs[SUB_REAL].linear = 0;
1381                 zt_setlinear(p->subs[SUB_REAL].zfd, 0);
1382         }
1383         while(p->cidpos < p->cidlen) {
1384                 res = write(p->subs[SUB_REAL].zfd, p->cidspill + p->cidpos, p->cidlen - p->cidpos);
1385                 if (res < 0) {
1386                         if (errno == EAGAIN)
1387                                 return 0;
1388                         else {
1389                                 ast_log(LOG_WARNING, "write failed: %s\n", strerror(errno));
1390                                 return -1;
1391                         }
1392                 }
1393                 if (!res)
1394                         return 0;
1395                 p->cidpos += res;
1396         }
1397         free(p->cidspill);
1398         p->cidspill = NULL;
1399         if (p->callwaitcas) {
1400                 /* Wait for CID/CW to expire */
1401                 p->cidcwexpire = CIDCW_EXPIRE_SAMPLES;
1402         } else
1403                 restore_conference(p);
1404         return 0;
1405 }
1406
1407 static int zt_callwait(struct ast_channel *ast)
1408 {
1409         struct zt_pvt *p = ast->pvt->pvt;
1410         p->callwaitingrepeat = CALLWAITING_REPEAT_SAMPLES;
1411         if (p->cidspill) {
1412                 ast_log(LOG_WARNING, "Spill already exists?!?\n");
1413                 free(p->cidspill);
1414         }
1415         p->cidspill = malloc(2400 /* SAS */ + 680 /* CAS */ + READ_SIZE * 4);
1416         if (p->cidspill) {
1417                 save_conference(p);
1418                 /* Silence */
1419                 memset(p->cidspill, 0x7f, 2400 + 600 + READ_SIZE * 4);
1420                 if (!p->callwaitrings && p->callwaitingcallerid) {
1421                         ast_gen_cas(p->cidspill, 1, 2400 + 680, AST_LAW(p));
1422                         p->callwaitcas = 1;
1423                         p->cidlen = 2400 + 680 + READ_SIZE * 4;
1424                 } else {
1425                         ast_gen_cas(p->cidspill, 1, 2400, AST_LAW(p));
1426                         p->callwaitcas = 0;
1427                         p->cidlen = 2400 + READ_SIZE * 4;
1428                 }
1429                 p->cidpos = 0;
1430                 send_callerid(p);
1431         } else {
1432                 ast_log(LOG_WARNING, "Unable to create SAS/CAS spill\n");
1433                 return -1;
1434         }
1435         return 0;
1436 }
1437
1438 static int zt_call(struct ast_channel *ast, char *rdest, int timeout)
1439 {
1440         struct zt_pvt *p = ast->pvt->pvt;
1441         int x, res, index;
1442         char *c, *n, *l;
1443 #ifdef ZAPATA_PRI
1444         char *s;
1445 #endif
1446         char callerid[256];
1447         char dest[256]; /* must be same length as p->dialdest */
1448         ast_mutex_lock(&p->lock);
1449         strncpy(dest, rdest, sizeof(dest) - 1);
1450         strncpy(p->dialdest, rdest, sizeof(dest) - 1);
1451         if ((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) {
1452                 ast_log(LOG_WARNING, "zt_call called on %s, neither down nor reserved\n", ast->name);
1453                 ast_mutex_unlock(&p->lock);
1454                 return -1;
1455         }
1456         p->dialednone = 0;
1457         if (p->radio)  /* if a radio channel, up immediately */
1458         {
1459                 /* Special pseudo -- automatically up */
1460                 ast_setstate(ast, AST_STATE_UP); 
1461                 ast_mutex_unlock(&p->lock);
1462                 return 0;
1463         }
1464         x = ZT_FLUSH_READ | ZT_FLUSH_WRITE;
1465         res = ioctl(p->subs[SUB_REAL].zfd, ZT_FLUSH, &x);
1466         if (res)
1467                 ast_log(LOG_WARNING, "Unable to flush input on channel %d\n", p->channel);
1468         p->outgoing = 1;
1469
1470         set_actual_gain(p->subs[SUB_REAL].zfd, 0, p->rxgain, p->txgain, p->law);
1471
1472         switch(p->sig) {
1473         case SIG_FXOLS:
1474         case SIG_FXOGS:
1475         case SIG_FXOKS:
1476                 if (p->owner == ast) {
1477                         /* Normal ring, on hook */
1478                         
1479                         /* Don't send audio while on hook, until the call is answered */
1480                         p->dialing = 1;
1481                         if (p->use_callerid) {
1482                                 /* Generate the Caller-ID spill if desired */
1483                                 if (p->cidspill) {
1484                                         ast_log(LOG_WARNING, "cidspill already exists??\n");
1485                                         free(p->cidspill);
1486                                 }
1487                                 p->cidspill = malloc(MAX_CALLERID_SIZE);
1488                                 p->callwaitcas = 0;
1489                                 if (p->cidspill) {
1490                                         p->cidlen = ast_callerid_generate(p->cidspill, ast->callerid, AST_LAW(p));
1491                                         p->cidpos = 0;
1492                                         send_callerid(p);
1493                                 } else
1494                                         ast_log(LOG_WARNING, "Unable to generate CallerID spill\n");
1495                         }
1496                         /* Choose proper cadence */
1497                         if ((p->distinctivering > 0) && (p->distinctivering <= num_cadence)) {
1498                                 if (ioctl(p->subs[SUB_REAL].zfd, ZT_SETCADENCE, &cadences[p->distinctivering-1]))
1499                                         ast_log(LOG_WARNING, "Unable to set distinctive ring cadence %d on '%s'\n", p->distinctivering, ast->name);
1500                                 p->cidrings = cidrings[p->distinctivering - 1];
1501                         } else {
1502                                 if (ioctl(p->subs[SUB_REAL].zfd, ZT_SETCADENCE, NULL))
1503                                         ast_log(LOG_WARNING, "Unable to reset default ring on '%s'\n", ast->name);
1504                                 p->cidrings = DEFAULT_CIDRINGS;
1505                         }
1506
1507
1508                         /* nick@dccinc.com 4/3/03 mods to allow for deferred dialing */
1509                         c = strchr(dest, '/');
1510                         if (c)
1511                                 c++;
1512                         if (c && (strlen(c) < p->stripmsd)) {
1513                                 ast_log(LOG_WARNING, "Number '%s' is shorter than stripmsd (%d)\n", c, p->stripmsd);
1514                                 c = NULL;
1515                         }
1516                         if (c) {
1517                                 p->dop.op = ZT_DIAL_OP_REPLACE;
1518                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "Tw%s", c);
1519                                 ast_log(LOG_DEBUG, "FXO: setup deferred dialstring: %s\n", c);
1520                         } else {
1521                                 strcpy(p->dop.dialstr, "");
1522                         }
1523                         x = ZT_RING;
1524                         if (ioctl(p->subs[SUB_REAL].zfd, ZT_HOOK, &x) && (errno != EINPROGRESS)) {
1525                                 ast_log(LOG_WARNING, "Unable to ring phone: %s\n", strerror(errno));
1526                                 ast_mutex_unlock(&p->lock);
1527                                 return -1;
1528                         }
1529                         p->dialing = 1;
1530                 } else {
1531                         /* Call waiting call */
1532                         p->callwaitrings = 0;
1533                         if (ast->callerid)
1534                                 strncpy(p->callwaitcid, ast->callerid, sizeof(p->callwaitcid)-1);
1535                         else
1536                                 strcpy(p->callwaitcid, "");
1537                         /* Call waiting tone instead */
1538                         if (zt_callwait(ast)) {
1539                                 ast_mutex_unlock(&p->lock);
1540                                 return -1;
1541                         }
1542                         /* Make ring-back */
1543                         if (tone_zone_play_tone(p->subs[SUB_CALLWAIT].zfd, ZT_TONE_RINGTONE))
1544                                 ast_log(LOG_WARNING, "Unable to generate call-wait ring-back on channel %s\n", ast->name);
1545                                 
1546                 }
1547                 if (ast->callerid) 
1548                         strncpy(callerid, ast->callerid, sizeof(callerid)-1);
1549                 else
1550                         strcpy(callerid, "");
1551                 ast_callerid_parse(callerid, &n, &l);
1552                 if (l) {
1553                         ast_shrink_phone_number(l);
1554                         if (!ast_isphonenumber(l))
1555                                 l = NULL;
1556                 }
1557                 if (l)
1558                         strcpy(p->lastcallerid, l);
1559                 else
1560                         strcpy(p->lastcallerid, "");
1561                 ast_setstate(ast, AST_STATE_RINGING);
1562                 index = zt_get_index(ast, p, 0);
1563                 if (index > -1) {
1564                         p->subs[index].needringing = 1;
1565                 }
1566                 break;
1567         case SIG_FXSLS:
1568         case SIG_FXSGS:
1569         case SIG_FXSKS:
1570         case SIG_EMWINK:
1571         case SIG_EM:
1572         case SIG_EM_E1:
1573         case SIG_FEATD:
1574         case SIG_FEATDMF:
1575         case SIG_E911:
1576         case SIG_FEATB:
1577         case SIG_SFWINK:
1578         case SIG_SF:
1579         case SIG_SF_FEATD:
1580         case SIG_SF_FEATDMF:
1581         case SIG_SF_FEATB:
1582                 c = strchr(dest, '/');
1583                 if (c)
1584                         c++;
1585                 else
1586                         c = "";
1587                 if (strlen(c) < p->stripmsd) {
1588                         ast_log(LOG_WARNING, "Number '%s' is shorter than stripmsd (%d)\n", c, p->stripmsd);
1589                         ast_mutex_unlock(&p->lock);
1590                         return -1;
1591                 }
1592                 x = ZT_START;
1593                 /* Start the trunk */
1594                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_HOOK, &x);
1595                 if (res < 0) {
1596                         if (errno != EINPROGRESS) {
1597                                 ast_log(LOG_WARNING, "Unable to start channel: %s\n", strerror(errno));
1598                                 ast_mutex_unlock(&p->lock);
1599                                 return -1;
1600                         }
1601                 }
1602                 ast_log(LOG_DEBUG, "Dialing '%s'\n", c);
1603                 p->dop.op = ZT_DIAL_OP_REPLACE;
1604                 if (p->sig == SIG_FEATD) {
1605                         if (ast->callerid) {
1606                                 strncpy(callerid, ast->callerid, sizeof(callerid)-1);
1607                                 ast_callerid_parse(callerid, &n, &l);
1608                                 if (l) {
1609                                         ast_shrink_phone_number(l);
1610                                         if (!ast_isphonenumber(l))
1611                                                 l = NULL;
1612                                 }
1613                         } else
1614                                 l = NULL;
1615                         if (l) 
1616                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "T*%s*%s*", l, c + p->stripmsd);
1617                         else
1618                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "T**%s*", c + p->stripmsd);
1619                 } else 
1620                 if (p->sig == SIG_FEATDMF) {
1621                         if (ast->callerid) {
1622                                 strncpy(callerid, ast->callerid, sizeof(callerid)-1);
1623                                 ast_callerid_parse(callerid, &n, &l);
1624                                 if (l) {
1625                                         ast_shrink_phone_number(l);
1626                                         if (!ast_isphonenumber(l))
1627                                                 l = NULL;
1628                                 }
1629                         } else
1630                                 l = NULL;
1631                         if (l) 
1632                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "M*00%s#*%s#", l, c + p->stripmsd);
1633                         else
1634                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "M*02#*%s#", c + p->stripmsd);
1635                 } else 
1636                 if (p->sig == SIG_E911) {
1637                         strcpy(p->dop.dialstr,"M*911#");
1638                 } else
1639                 if (p->sig == SIG_FEATB) {
1640                         snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "M*%s#", c + p->stripmsd);
1641                 } else 
1642                         snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "T%sw", c + p->stripmsd);
1643                 if (strlen(p->dop.dialstr) > 4) {
1644                         strcpy(p->echorest, "w");
1645                         strcpy(p->echorest + 1, p->dop.dialstr + strlen(p->dop.dialstr) - 2);
1646                         p->echobreak = 1;
1647                         p->dop.dialstr[strlen(p->dop.dialstr)-2] = '\0';
1648                 } else
1649                         p->echobreak = 0;
1650                 if (!res) {
1651                         if (ioctl(p->subs[SUB_REAL].zfd, ZT_DIAL, &p->dop)) {
1652                                 x = ZT_ONHOOK;
1653                                 ioctl(p->subs[SUB_REAL].zfd, ZT_HOOK, &x);
1654                                 ast_log(LOG_WARNING, "Dialing failed on channel %d: %s\n", p->channel, strerror(errno));
1655                                 ast_mutex_unlock(&p->lock);
1656                                 return -1;
1657                         }
1658                 } else
1659                         ast_log(LOG_DEBUG, "Deferring dialing...\n");
1660                 p->dialing = 1;
1661                 if (strlen(c + p->stripmsd) < 1) p->dialednone = 1;
1662                 ast_setstate(ast, AST_STATE_DIALING);
1663                 break;
1664         case 0:
1665                 /* Special pseudo -- automatically up*/
1666                 ast_setstate(ast, AST_STATE_UP);
1667                 break;          
1668         case SIG_PRI:
1669                 /* We'll get it in a moment -- but use dialdest to store pre-setup_ack digits */
1670                 strcpy(p->dialdest, "");
1671                 break;
1672         default:
1673                 ast_log(LOG_DEBUG, "not yet implemented\n");
1674                 ast_mutex_unlock(&p->lock);
1675                 return -1;
1676         }
1677 #ifdef ZAPATA_PRI
1678         if (p->pri) {
1679                 struct pri_sr *sr;
1680                 c = strchr(dest, '/');
1681                 if (c)
1682                         c++;
1683                 else
1684                         c = dest;
1685                 if (ast->callerid && !p->hidecallerid) {
1686                         strncpy(callerid, ast->callerid, sizeof(callerid)-1);
1687                         ast_callerid_parse(callerid, &n, &l);
1688                         if (l) {
1689                                 ast_shrink_phone_number(l);
1690                                 if (!ast_isphonenumber(l))
1691                                         l = NULL;
1692                         }
1693                 } else
1694                         l = NULL;
1695                 if (strlen(c) < p->stripmsd) {
1696                         ast_log(LOG_WARNING, "Number '%s' is shorter than stripmsd (%d)\n", c, p->stripmsd);
1697                         ast_mutex_unlock(&p->lock);
1698                         return -1;
1699                 }
1700                 p->dop.op = ZT_DIAL_OP_REPLACE;
1701                 s = strchr(c + p->stripmsd, 'w');
1702                 if (s) {
1703                         if (strlen(s))
1704                                 snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "T%s", s);
1705                         else
1706                                 strcpy(p->dop.dialstr, "");
1707                         *s = '\0';
1708                 } else {
1709                         strcpy(p->dop.dialstr, "");
1710                 }
1711                 if (pri_grab(p, p->pri)) {
1712                         ast_log(LOG_WARNING, "Failed to grab PRI!\n");
1713                         ast_mutex_unlock(&p->lock);
1714                         return -1;
1715                 }
1716                 if (!(p->call = pri_new_call(p->pri->pri))) {
1717                         ast_log(LOG_WARNING, "Unable to create call on channel %d\n", p->channel);
1718                         pri_rel(p->pri);
1719                         ast_mutex_unlock(&p->lock);
1720                         return -1;
1721                 }
1722                 if (!(sr = pri_sr_new())) {
1723                         ast_log(LOG_WARNING, "Failed to allocate setup request channel %d\n", p->channel);
1724                         pri_rel(p->pri);
1725                         ast_mutex_unlock(&p->lock);
1726                 }
1727                 if (p->bearer) {
1728                         ast_log(LOG_DEBUG, "Oooh, I have a bearer on %d (%d:%d)\n", PVT_TO_CHANNEL(p->bearer), p->bearer->logicalspan, p->bearer->channel);
1729                         pri_set_crv(p->pri->pri, p->call, p->channel, 0);
1730                         p->bearer->call = p->call;
1731                 }
1732                 p->digital = ast_test_flag(ast,AST_FLAG_DIGITAL);
1733                 pri_sr_set_channel(sr, p->bearer ? PVT_TO_CHANNEL(p->bearer) : PVT_TO_CHANNEL(p), 
1734                                                                 p->pri->nodetype == PRI_NETWORK ? 0 : 1, 1);
1735                 pri_sr_set_bearer(sr, p->digital ? PRI_TRANS_CAP_DIGITAL : PRI_TRANS_CAP_SPEECH, 
1736                                         (p->digital ? -1 : 
1737                                                 ((p->law == ZT_LAW_ALAW) ? PRI_LAYER_1_ALAW : PRI_LAYER_1_ULAW)));
1738                 pri_sr_set_called(sr, c + p->stripmsd, p->pri->dialplan - 1,  s ? 1 : 0);
1739                 pri_sr_set_caller(sr, l, n, p->pri->dialplan - 1, 
1740                                         l ? (ast->restrictcid ? PRES_PROHIB_USER_NUMBER_PASSED_SCREEN : 
1741                                                 (p->use_callingpres ? ast->callingpres : PRES_ALLOWED_USER_NUMBER_PASSED_SCREEN)) : 
1742                                                  PRES_NUMBER_NOT_AVAILABLE);
1743                 if (pri_setup(p->pri->pri, p->call,  sr)) {
1744                         ast_log(LOG_WARNING, "Unable to setup call to %s\n", c + p->stripmsd);
1745                         pri_rel(p->pri);
1746                         ast_mutex_unlock(&p->lock);
1747                         pri_sr_free(sr);
1748                         return -1;
1749                 }
1750                 pri_sr_free(sr);
1751                 ast_setstate(ast, AST_STATE_DIALING);
1752                 pri_rel(p->pri);
1753         }
1754 #endif          
1755         ast_mutex_unlock(&p->lock);
1756         return 0;
1757 }
1758
1759 static void destroy_zt_pvt(struct zt_pvt **pvt)
1760 {
1761         struct zt_pvt *p = *pvt;
1762         ast_mutex_destroy(&p->lock);
1763         free(p);
1764         *pvt = NULL;
1765 }
1766
1767 static int destroy_channel(struct zt_pvt *prev, struct zt_pvt *cur, int now)
1768 {
1769         int owned = 0;
1770         int i = 0;
1771
1772         if (!now) {
1773                 if (cur->owner) {
1774                         owned = 1;
1775                 }
1776
1777                 for (i = 0; i < 3; i++) {
1778                         if (cur->subs[i].owner) {
1779                                 owned = 1;
1780                         }
1781                 }
1782                 if (!owned) {
1783                         if (prev) {
1784                                 prev->next = cur->next;
1785                                 if (prev->next)
1786                                         prev->next->prev = prev;
1787                                 else
1788                                         ifend = prev;
1789                         } else {
1790                                 iflist = cur->next;
1791                                 if (iflist)
1792                                         iflist->prev = NULL;
1793                                 else
1794                                         ifend = NULL;
1795                         }
1796                         if (cur->subs[SUB_REAL].zfd > -1) {
1797                                 zt_close(cur->subs[SUB_REAL].zfd);
1798                         }
1799                         destroy_zt_pvt(&cur);
1800                 }
1801         } else {
1802                 if (prev) {
1803                         prev->next = cur->next;
1804                         if (prev->next)
1805                                 prev->next->prev = prev;
1806                         else
1807                                 ifend = prev;
1808                 } else {
1809                         iflist = cur->next;
1810                         if (iflist)
1811                                 iflist->prev = NULL;
1812                         else
1813                                 ifend = NULL;
1814                 }
1815                 if (cur->subs[SUB_REAL].zfd > -1) {
1816                         zt_close(cur->subs[SUB_REAL].zfd);
1817                 }
1818                 destroy_zt_pvt(&cur);
1819         }
1820         return 0;
1821 }
1822
1823 #ifdef ZAPATA_PRI
1824 int pri_is_up(struct zt_pri *pri)
1825 {
1826         int x;
1827         for (x=0;x<NUM_DCHANS;x++) {
1828                 if (pri->dchanavail[x] == DCHAN_AVAILABLE)
1829                         return 1;
1830         }
1831         return 0;
1832 }
1833
1834 int pri_assign_bearer(struct zt_pvt *crv, struct zt_pri *pri, struct zt_pvt *bearer)
1835 {
1836         bearer->owner = &inuse;
1837         bearer->master = crv;
1838         crv->subs[SUB_REAL].zfd = bearer->subs[SUB_REAL].zfd;
1839         crv->bearer = bearer;
1840         crv->call = bearer->call;
1841         crv->pri = pri;
1842         return 0;
1843 }
1844
1845 static char *pri_order(int level)
1846 {
1847         switch(level) {
1848         case 0:
1849                 return "Primary";
1850         case 1:
1851                 return "Secondary";
1852         case 2:
1853                 return "Tertiary";
1854         case 3:
1855                 return "Quaternary";
1856         default:
1857                 return "<Unknown>";
1858         }               
1859 }
1860
1861 int pri_find_dchan(struct zt_pri *pri)
1862 {
1863         int oldslot = -1;
1864         struct pri *old;
1865         int newslot = -1;
1866         int x;
1867         old = pri->pri;
1868         for(x=0;x<NUM_DCHANS;x++) {
1869                 if ((pri->dchanavail[x] == DCHAN_AVAILABLE) && (newslot < 0))
1870                         newslot = x;
1871                 if (pri->dchans[x] == old) {
1872                         oldslot = x;
1873                 }
1874         }
1875         if (newslot < 0) {
1876                 newslot = 0;
1877                 ast_log(LOG_WARNING, "No D-channels available!  Using Primary on channel anyway %d!\n",
1878                         pri->dchannels[newslot]);
1879         }
1880         if (old && (oldslot != newslot))
1881                 ast_log(LOG_NOTICE, "Switching from from d-channel %d to channel %d!\n",
1882                         pri->dchannels[oldslot], pri->dchannels[newslot]);
1883         pri->pri = pri->dchans[newslot];
1884         return 0;
1885 }
1886 #endif
1887
1888 static int zt_hangup(struct ast_channel *ast)
1889 {
1890         int res;
1891         int index,x, law;
1892         static int restore_gains(struct zt_pvt *p);
1893         struct zt_pvt *p = ast->pvt->pvt;
1894         struct zt_pvt *tmp = NULL;
1895         struct zt_pvt *prev = NULL;
1896         ZT_PARAMS par;
1897
1898         if (option_debug)
1899                 ast_log(LOG_DEBUG, "zt_hangup(%s)\n", ast->name);
1900         if (!ast->pvt->pvt) {
1901                 ast_log(LOG_WARNING, "Asked to hangup channel not connected\n");
1902                 return 0;
1903         }
1904         
1905         ast_mutex_lock(&p->lock);
1906         
1907         index = zt_get_index(ast, p, 1);
1908
1909         if (p->sig == SIG_PRI) {
1910                 x = 1;
1911                 ast_channel_setoption(ast,AST_OPTION_AUDIO_MODE,&x,sizeof(char),0);
1912         }
1913
1914         x = 0;
1915         zt_confmute(p, 0);
1916         restore_gains(p);
1917         if (p->origcallerid) {
1918                 strncpy(p->callerid, p->origcallerid, sizeof(p->callerid) - 1);
1919                 free(p->origcallerid);
1920                 p->origcallerid = NULL;
1921         }       
1922         if (p->dsp)
1923                 ast_dsp_digitmode(p->dsp,DSP_DIGITMODE_DTMF | p->dtmfrelax);
1924         if (p->exten)
1925                 strcpy(p->exten, "");
1926
1927         ast_log(LOG_DEBUG, "Hangup: channel: %d index = %d, normal = %d, callwait = %d, thirdcall = %d\n",
1928                 p->channel, index, p->subs[SUB_REAL].zfd, p->subs[SUB_CALLWAIT].zfd, p->subs[SUB_THREEWAY].zfd);
1929         p->ignoredtmf = 0;
1930         
1931         if (index > -1) {
1932                 /* Real channel, do some fixup */
1933                 p->subs[index].owner = NULL;
1934                 p->subs[index].needanswer = 0;
1935                 p->subs[index].needringing = 0;
1936                 p->subs[index].needbusy = 0;
1937                 p->subs[index].needcongestion = 0;
1938                 p->subs[index].linear = 0;
1939                 p->subs[index].needcallerid = 0;
1940                 zt_setlinear(p->subs[index].zfd, 0);
1941                 if (index == SUB_REAL) {
1942                         if ((p->subs[SUB_CALLWAIT].zfd > -1) && (p->subs[SUB_THREEWAY].zfd > -1)) {
1943                                 ast_log(LOG_DEBUG, "Normal call hung up with both three way call and a call waiting call in place?\n");
1944                                 if (p->subs[SUB_CALLWAIT].inthreeway) {
1945                                         /* We had flipped over to answer a callwait and now it's gone */
1946                                         ast_log(LOG_DEBUG, "We were flipped over to the callwait, moving back and unowning.\n");
1947                                         /* Move to the call-wait, but un-own us until they flip back. */
1948                                         swap_subs(p, SUB_CALLWAIT, SUB_REAL);
1949                                         unalloc_sub(p, SUB_CALLWAIT);
1950                                         p->owner = NULL;
1951                                 } else {
1952                                         /* The three way hung up, but we still have a call wait */
1953                                         ast_log(LOG_DEBUG, "We were in the threeway and have a callwait still.  Ditching the threeway.\n");
1954                                         swap_subs(p, SUB_THREEWAY, SUB_REAL);
1955                                         unalloc_sub(p, SUB_THREEWAY);
1956                                         if (p->subs[SUB_REAL].inthreeway) {
1957                                                 /* This was part of a three way call.  Immediately make way for
1958                                                    another call */
1959                                                 ast_log(LOG_DEBUG, "Call was complete, setting owner to former third call\n");
1960                                                 p->owner = p->subs[SUB_REAL].owner;
1961                                         } else {
1962                                                 /* This call hasn't been completed yet...  Set owner to NULL */
1963                                                 ast_log(LOG_DEBUG, "Call was incomplete, setting owner to NULL\n");
1964                                                 p->owner = NULL;
1965                                         }
1966                                         p->subs[SUB_REAL].inthreeway = 0;
1967                                 }
1968                         } else if (p->subs[SUB_CALLWAIT].zfd > -1) {
1969                                 /* Move to the call-wait and switch back to them. */
1970                                 swap_subs(p, SUB_CALLWAIT, SUB_REAL);
1971                                 unalloc_sub(p, SUB_CALLWAIT);
1972                                 p->owner = p->subs[SUB_REAL].owner;
1973                                 if (p->owner->_state != AST_STATE_UP)
1974                                         p->subs[SUB_REAL].needanswer = 1;
1975                                 if (p->subs[SUB_REAL].owner->bridge)
1976                                         ast_moh_stop(p->subs[SUB_REAL].owner->bridge);
1977                         } else if (p->subs[SUB_THREEWAY].zfd > -1) {
1978                                 swap_subs(p, SUB_THREEWAY, SUB_REAL);
1979                                 unalloc_sub(p, SUB_THREEWAY);
1980                                 if (p->subs[SUB_REAL].inthreeway) {
1981                                         /* This was part of a three way call.  Immediately make way for
1982                                            another call */
1983                                         ast_log(LOG_DEBUG, "Call was complete, setting owner to former third call\n");
1984                                         p->owner = p->subs[SUB_REAL].owner;
1985                                 } else {
1986                                         /* This call hasn't been completed yet...  Set owner to NULL */
1987                                         ast_log(LOG_DEBUG, "Call was incomplete, setting owner to NULL\n");
1988                                         p->owner = NULL;
1989                                 }
1990                                 p->subs[SUB_REAL].inthreeway = 0;
1991                         }
1992                 } else if (index == SUB_CALLWAIT) {
1993                         /* Ditch the holding callwait call, and immediately make it availabe */
1994                         if (p->subs[SUB_CALLWAIT].inthreeway) {
1995                                 /* This is actually part of a three way, placed on hold.  Place the third part
1996                                    on music on hold now */
1997                                 if (p->subs[SUB_THREEWAY].owner && p->subs[SUB_THREEWAY].owner->bridge)
1998                                         ast_moh_start(p->subs[SUB_THREEWAY].owner->bridge, NULL);
1999                                 p->subs[SUB_THREEWAY].inthreeway = 0;
2000                                 /* Make it the call wait now */
2001                                 swap_subs(p, SUB_CALLWAIT, SUB_THREEWAY);
2002                                 unalloc_sub(p, SUB_THREEWAY);
2003                         } else
2004                                 unalloc_sub(p, SUB_CALLWAIT);
2005                 } else if (index == SUB_THREEWAY) {
2006                         if (p->subs[SUB_CALLWAIT].inthreeway) {
2007                                 /* The other party of the three way call is currently in a call-wait state.
2008                                    Start music on hold for them, and take the main guy out of the third call */
2009                                 if (p->subs[SUB_CALLWAIT].owner && p->subs[SUB_CALLWAIT].owner->bridge)
2010                                         ast_moh_start(p->subs[SUB_CALLWAIT].owner->bridge, NULL);
2011                                 p->subs[SUB_CALLWAIT].inthreeway = 0;
2012                         }
2013                         p->subs[SUB_REAL].inthreeway = 0;
2014                         /* If this was part of a three way call index, let us make
2015                            another three way call */
2016                         unalloc_sub(p, SUB_THREEWAY);
2017                 } else {
2018                         /* This wasn't any sort of call, but how are we an index? */
2019                         ast_log(LOG_WARNING, "Index found but not any type of call?\n");
2020                 }
2021         }
2022
2023
2024         if (!p->subs[SUB_REAL].owner && !p->subs[SUB_CALLWAIT].owner && !p->subs[SUB_THREEWAY].owner) {
2025                 p->owner = NULL;
2026                 p->ringt = 0;
2027                 p->distinctivering = 0;
2028                 p->confirmanswer = 0;
2029                 p->cidrings = 1;
2030                 p->outgoing = 0;
2031                 p->digital = 0;
2032                 p->faxhandled = 0;
2033                 p->pulsedial = 0;
2034                 p->onhooktime = time(NULL);
2035 #ifdef ZAPATA_PRI
2036                 p->proceeding = 0;
2037                 p->setup_ack = 0;
2038 #endif          
2039                 if (p->dsp) {
2040                         ast_dsp_free(p->dsp);
2041                         p->dsp = NULL;
2042                 }
2043
2044                 law = ZT_LAW_DEFAULT;
2045                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_SETLAW, &law);
2046                 if (res < 0) 
2047                         ast_log(LOG_WARNING, "Unable to set law on channel %d to default\n", p->channel);
2048                 /* Perform low level hangup if no owner left */
2049 #ifdef ZAPATA_PRI
2050                 if (p->pri) {
2051                         /* Make sure we have a call (or REALLY have a call in the case of a PRI) */
2052                         if (p->call && (!p->bearer || (p->bearer->call == p->call))) {
2053                                 if (!pri_grab(p, p->pri)) {
2054                                         if (p->alreadyhungup) {
2055                                                 ast_log(LOG_DEBUG, "Already hungup...  Calling hangup once, and clearing call\n");
2056                                                 pri_hangup(p->pri->pri, p->call, -1);
2057                                                 p->call = NULL;
2058                                                 if (p->bearer) 
2059                                                         p->bearer->call = NULL;
2060                                         } else {
2061                                                 char *cause = pbx_builtin_getvar_helper(ast,"PRI_CAUSE");
2062                                                 int icause = ast->hangupcause ? hangup_cause2pri(ast->hangupcause) : -1;
2063                                                 ast_log(LOG_DEBUG, "Not yet hungup...  Calling hangup once with icause, and clearing call\n");
2064                                                 p->alreadyhungup = 1;
2065                                                 if (p->bearer)
2066                                                         p->bearer->alreadyhungup = 1;
2067                                                 if (cause) {
2068                                                         if (atoi(cause))
2069                                                                 icause = atoi(cause);
2070                                                 }
2071                                                 pri_hangup(p->pri->pri, p->call, icause);
2072                                         }
2073                                         if (res < 0) 
2074                                                 ast_log(LOG_WARNING, "pri_disconnect failed\n");
2075                                         pri_rel(p->pri);                        
2076                                 } else {
2077                                         ast_log(LOG_WARNING, "Unable to grab PRI on span %d\n", p->span);
2078                                         res = -1;
2079                                 }
2080                         } else {
2081                                 if (p->bearer)
2082                                         ast_log(LOG_DEBUG, "Bearer call is %p, while ours is still %p\n", p->bearer->call, p->call);
2083                                 p->call = NULL;
2084                                 res = 0;
2085                         }
2086                 }
2087 #endif
2088 #ifdef ZAPATA_R2
2089                 if (p->sig == SIG_R2) {
2090                         if (p->hasr2call) {
2091                                 mfcr2_DropCall(p->r2, NULL, UC_NORMAL_CLEARING);
2092                                 p->hasr2call = 0;
2093                                 res = 0;
2094                         } else
2095                                 res = 0;
2096
2097                 }
2098 #endif
2099                 if (p->sig && (p->sig != SIG_PRI) && (p->sig != SIG_R2))
2100                         res = zt_set_hook(p->subs[SUB_REAL].zfd, ZT_ONHOOK);
2101                 if (res < 0) {
2102                         ast_log(LOG_WARNING, "Unable to hangup line %s\n", ast->name);
2103                 }
2104                 switch(p->sig) {
2105                 case SIG_FXOGS:
2106                 case SIG_FXOLS:
2107                 case SIG_FXOKS:
2108                         res = ioctl(p->subs[SUB_REAL].zfd, ZT_GET_PARAMS, &par);
2109                         if (!res) {
2110 #if 0
2111                                 ast_log(LOG_DEBUG, "Hanging up channel %d, offhook = %d\n", p->channel, par.rxisoffhook);
2112 #endif
2113                                 /* If they're off hook, try playing congestion */
2114                                 if (par.rxisoffhook)
2115                                         tone_zone_play_tone(p->subs[SUB_REAL].zfd, ZT_TONE_CONGESTION);
2116                                 else
2117                                         tone_zone_play_tone(p->subs[SUB_REAL].zfd, -1);
2118                         }
2119                         break;
2120                 case SIG_FXSGS:
2121                 case SIG_FXSLS:
2122                 case SIG_FXSKS:
2123                         /* Make sure we're not made available for at least two seconds */
2124                         time(&p->guardtime);
2125                         p->guardtime += 2;
2126                         break;
2127                 default:
2128                         tone_zone_play_tone(p->subs[SUB_REAL].zfd, -1);
2129                 }
2130                 if (p->cidspill)
2131                         free(p->cidspill);
2132                 if (p->sig)
2133                         zt_disable_ec(p);
2134                 x = 0;
2135                 ast_channel_setoption(ast,AST_OPTION_TONE_VERIFY,&x,sizeof(char),0);
2136                 ast_channel_setoption(ast,AST_OPTION_TDD,&x,sizeof(char),0);
2137                 p->didtdd = 0;
2138                 p->cidspill = NULL;
2139                 p->callwaitcas = 0;
2140                 p->callwaiting = p->permcallwaiting;
2141                 p->hidecallerid = p->permhidecallerid;
2142                 p->dialing = 0;
2143                 strcpy(p->rdnis, "");
2144                 update_conf(p);
2145                 /* Restore data mode */
2146                 if (p->sig == SIG_PRI) {
2147                         x = 0;
2148                         ast_channel_setoption(ast,AST_OPTION_AUDIO_MODE,&x,sizeof(char),0);
2149                 }
2150 #ifdef ZAPATA_PRI
2151                 if (p->bearer) {
2152                         ast_log(LOG_DEBUG, "Freeing up bearer channel %d\n", p->bearer->channel);
2153                         /* Free up the bearer channel as well, and
2154                            don't use its file descriptor anymore */
2155                         p->bearer->owner = NULL;
2156                         p->bearer = NULL;
2157                         p->subs[SUB_REAL].zfd = -1;
2158                         p->pri = NULL;
2159                 }
2160 #endif
2161                 restart_monitor();
2162         }
2163
2164
2165         p->callwaitingrepeat = 0;
2166         p->cidcwexpire = 0;
2167         ast->pvt->pvt = NULL;
2168         ast_mutex_unlock(&p->lock);
2169         ast_mutex_lock(&usecnt_lock);
2170         usecnt--;
2171         if (usecnt < 0) 
2172                 ast_log(LOG_WARNING, "Usecnt < 0???\n");
2173         ast_mutex_unlock(&usecnt_lock);
2174         ast_update_use_count();
2175         if (option_verbose > 2) 
2176                 ast_verbose( VERBOSE_PREFIX_3 "Hungup '%s'\n", ast->name);
2177
2178         ast_mutex_lock(&iflock);
2179         tmp = iflist;
2180         prev = NULL;
2181         if (p->destroy) {
2182                 while (tmp) {
2183                         if (tmp == p) {
2184                                 destroy_channel(prev, tmp, 0);
2185                                 break;
2186                         } else {
2187                                 prev = tmp;
2188                                 tmp = tmp->next;
2189                         }
2190                 }
2191         }
2192         ast_mutex_unlock(&iflock);
2193         return 0;
2194 }
2195
2196 static int zt_answer(struct ast_channel *ast)
2197 {
2198         struct zt_pvt *p = ast->pvt->pvt;
2199         int res=0;
2200         int index;
2201         int oldstate = ast->_state;
2202         ast_setstate(ast, AST_STATE_UP);
2203         ast_mutex_lock(&p->lock);
2204         index = zt_get_index(ast, p, 0);
2205         if (index < 0)
2206                 index = SUB_REAL;
2207         /* nothing to do if a radio channel */
2208         if (p->radio) {
2209                 ast_mutex_unlock(&p->lock);
2210                 return 0;
2211         }
2212         switch(p->sig) {
2213         case SIG_FXSLS:
2214         case SIG_FXSGS:
2215         case SIG_FXSKS:
2216                 p->ringt = 0;
2217                 /* Fall through */
2218         case SIG_EM:
2219         case SIG_EM_E1:
2220         case SIG_EMWINK:
2221         case SIG_FEATD:
2222         case SIG_FEATDMF:
2223         case SIG_E911:
2224         case SIG_FEATB:
2225         case SIG_SF:
2226         case SIG_SFWINK:
2227         case SIG_SF_FEATD:
2228         case SIG_SF_FEATDMF:
2229         case SIG_SF_FEATB:
2230         case SIG_FXOLS:
2231         case SIG_FXOGS:
2232         case SIG_FXOKS:
2233                 /* Pick up the line */
2234                 ast_log(LOG_DEBUG, "Took %s off hook\n", ast->name);
2235                 res =  zt_set_hook(p->subs[SUB_REAL].zfd, ZT_OFFHOOK);
2236                 tone_zone_play_tone(p->subs[index].zfd, -1);
2237                 p->dialing = 0;
2238                 if ((index == SUB_REAL) && p->subs[SUB_THREEWAY].inthreeway) {
2239                         if (oldstate == AST_STATE_RINGING) {
2240                                 ast_log(LOG_DEBUG, "Finally swapping real and threeway\n");
2241                                 tone_zone_play_tone(p->subs[SUB_THREEWAY].zfd, -1);
2242                                 swap_subs(p, SUB_THREEWAY, SUB_REAL);
2243                                 p->owner = p->subs[SUB_REAL].owner;
2244                         }
2245                 }
2246                 if (p->sig & __ZT_SIG_FXS) {
2247                         zt_enable_ec(p);
2248                         zt_train_ec(p);
2249                 }
2250                 break;
2251 #ifdef ZAPATA_PRI
2252         case SIG_PRI:
2253                 /* Send a pri acknowledge */
2254                 if (!pri_grab(p, p->pri)) {
2255                         p->proceeding = 2;
2256                         res = pri_answer(p->pri->pri, p->call, 0, 1);
2257                         pri_rel(p->pri);
2258                 } else {
2259                         ast_log(LOG_WARNING, "Unable to grab PRI on span %d\n", p->span);
2260                         res= -1;
2261                 }
2262                 break;
2263 #endif
2264 #ifdef ZAPATA_R2
2265         case SIG_R2:
2266                 res = mfcr2_AnswerCall(p->r2, NULL);
2267                 if (res)
2268                         ast_log(LOG_WARNING, "R2 Answer call failed :( on %s\n", ast->name);
2269                 break;
2270 #endif                  
2271         case 0:
2272                 ast_mutex_unlock(&p->lock);
2273                 return 0;
2274         default:
2275                 ast_log(LOG_WARNING, "Don't know how to answer signalling %d (channel %d)\n", p->sig, p->channel);
2276                 res = -1;
2277         }
2278         ast_mutex_unlock(&p->lock);
2279         return res;
2280 }
2281
2282 static int zt_setoption(struct ast_channel *chan, int option, void *data, int datalen)
2283 {
2284 char    *cp;
2285 int     x;
2286
2287         struct zt_pvt *p = chan->pvt->pvt;
2288
2289         
2290         if ((option != AST_OPTION_TONE_VERIFY) && (option != AST_OPTION_AUDIO_MODE) &&
2291                 (option != AST_OPTION_TDD) && (option != AST_OPTION_RELAXDTMF))
2292            {
2293                 errno = ENOSYS;
2294                 return -1;
2295            }
2296         cp = (char *)data;
2297         if ((!cp) || (datalen < 1))
2298            {
2299                 errno = EINVAL;
2300                 return -1;
2301            }
2302         switch(option) {
2303             case AST_OPTION_TONE_VERIFY:
2304                 if (!p->dsp)
2305                         break;
2306                 switch(*cp) {
2307                     case 1:
2308                                 ast_log(LOG_DEBUG, "Set option TONE VERIFY, mode: MUTECONF(1) on %s\n",chan->name);
2309                                 ast_dsp_digitmode(p->dsp,DSP_DIGITMODE_MUTECONF | p->dtmfrelax);  /* set mute mode if desired */
2310                         break;
2311                     case 2:
2312                                 ast_log(LOG_DEBUG, "Set option TONE VERIFY, mode: MUTECONF/MAX(2) on %s\n",chan->name);
2313                                 ast_dsp_digitmode(p->dsp,DSP_DIGITMODE_MUTECONF | DSP_DIGITMODE_MUTEMAX | p->dtmfrelax);  /* set mute mode if desired */
2314                         break;
2315                     default:
2316                                 ast_log(LOG_DEBUG, "Set option TONE VERIFY, mode: OFF(0) on %s\n",chan->name);
2317                                 ast_dsp_digitmode(p->dsp,DSP_DIGITMODE_DTMF | p->dtmfrelax);  /* set mute mode if desired */
2318                         break;
2319                 }
2320                 break;
2321             case AST_OPTION_TDD:  /* turn on or off TDD */
2322                 if (!*cp) { /* turn it off */
2323                         ast_log(LOG_DEBUG, "Set option TDD MODE, value: OFF(0) on %s\n",chan->name);
2324                         if (p->tdd) tdd_free(p->tdd);
2325                         p->tdd = 0;
2326                         p->mate = 0;
2327                         break;
2328                 }
2329                 if (*cp == 2)
2330                         ast_log(LOG_DEBUG, "Set option TDD MODE, value: MATE(2) on %s\n",chan->name);
2331                 else ast_log(LOG_DEBUG, "Set option TDD MODE, value: ON(1) on %s\n",chan->name);
2332                 p->mate = 0;
2333                 zt_disable_ec(p);
2334                 /* otherwise, turn it on */
2335                 if (!p->didtdd) { /* if havent done it yet */
2336                         unsigned char mybuf[41000],*buf;
2337                         int size,res,fd,len;
2338                         int index;
2339                         struct pollfd fds[1];
2340                         buf = mybuf;
2341                         memset(buf,0x7f,sizeof(mybuf)); /* set to silence */
2342                         ast_tdd_gen_ecdisa(buf + 16000,16000);  /* put in tone */
2343                         len = 40000;
2344                         index = zt_get_index(chan, p, 0);
2345                         if (index < 0) {
2346                                 ast_log(LOG_WARNING, "No index in TDD?\n");
2347                                 return -1;
2348                         }
2349                         fd = p->subs[index].zfd;
2350                         while(len) {
2351                                 if (ast_check_hangup(chan)) return -1;
2352                                 size = len;
2353                                 if (size > READ_SIZE)
2354                                         size = READ_SIZE;
2355                                 fds[0].fd = fd;
2356                                 fds[0].events = POLLPRI | POLLOUT;
2357                                 res = poll(fds, 1, -1);
2358                                 if (!res) {
2359                                         ast_log(LOG_DEBUG, "poll (for write) ret. 0 on channel %d\n", p->channel);
2360                                         continue;
2361                                 }
2362                                   /* if got exception */
2363                                 if (fds[0].revents & POLLPRI) return -1;
2364                                 if (!(fds[0].revents & POLLOUT)) {
2365                                         ast_log(LOG_DEBUG, "write fd not ready on channel %d\n", p->channel);
2366                                         continue;
2367                                 }
2368                                 res = write(fd, buf, size);
2369                                 if (res != size) {
2370                                         if (res == -1) return -1;
2371                                         ast_log(LOG_DEBUG, "Write returned %d (%s) on channel %d\n", res, strerror(errno), p->channel);
2372                                         break;
2373                                 }
2374                                 len -= size;
2375                                 buf += size;
2376                         }
2377                         p->didtdd = 1; /* set to have done it now */            
2378                 }
2379                 if (*cp == 2) { /* Mate mode */
2380                         if (p->tdd) tdd_free(p->tdd);
2381                         p->tdd = 0;
2382                         p->mate = 1;
2383                         break;
2384                         }               
2385                 if (!p->tdd) { /* if we dont have one yet */
2386                         p->tdd = tdd_new(); /* allocate one */
2387                 }               
2388                 break;
2389             case AST_OPTION_RELAXDTMF:  /* Relax DTMF decoding (or not) */
2390                 if (!*cp)
2391                 {               
2392                         ast_log(LOG_DEBUG, "Set option RELAX DTMF, value: OFF(0) on %s\n",chan->name);
2393                         x = 0;
2394                 }
2395                 else
2396                 {               
2397                         ast_log(LOG_DEBUG, "Set option RELAX DTMF, value: ON(1) on %s\n",chan->name);
2398                         x = 1;
2399                 }
2400                 ast_dsp_digitmode(p->dsp,x ? DSP_DIGITMODE_RELAXDTMF : DSP_DIGITMODE_DTMF | p->dtmfrelax);
2401                 break;
2402             case AST_OPTION_AUDIO_MODE:  /* Set AUDIO mode (or not) */
2403                 if (!*cp)
2404                 {               
2405                         ast_log(LOG_DEBUG, "Set option AUDIO MODE, value: OFF(0) on %s\n",chan->name);
2406                         x = 0;
2407                         zt_disable_ec(p);
2408                 }
2409                 else
2410                 {               
2411                         ast_log(LOG_DEBUG, "Set option AUDIO MODE, value: ON(1) on %s\n",chan->name);
2412                         x = 1;
2413                 }
2414                 if (ioctl(p->subs[SUB_REAL].zfd, ZT_AUDIOMODE, &x) == -1)
2415                         ast_log(LOG_WARNING, "Unable to set audio mode on channel %d to %d\n", p->channel, x);
2416                 break;
2417         }
2418         errno = 0;
2419         return 0;
2420 }
2421
2422 static void zt_unlink(struct zt_pvt *slave, struct zt_pvt *master, int needlock)
2423 {
2424         /* Unlink a specific slave or all slaves/masters from a given master */
2425         int x;
2426         int hasslaves;
2427         if (!master)
2428                 return;
2429         if (needlock) {
2430                 ast_mutex_lock(&master->lock);
2431                 if (slave) {
2432                         while(ast_mutex_trylock(&slave->lock)) {
2433                                 ast_mutex_unlock(&master->lock);
2434                                 usleep(1);
2435                                 ast_mutex_lock(&master->lock);
2436                         }
2437                 }
2438         }
2439         hasslaves = 0;
2440         for (x=0;x<MAX_SLAVES;x++) {
2441                 if (master->slaves[x]) {
2442                         if (!slave || (master->slaves[x] == slave)) {
2443                                 /* Take slave out of the conference */
2444                                 ast_log(LOG_DEBUG, "Unlinking slave %d from %d\n", master->slaves[x]->channel, master->channel);
2445                                 conf_del(master, &master->slaves[x]->subs[SUB_REAL], SUB_REAL);
2446                                 conf_del(master->slaves[x], &master->subs[SUB_REAL], SUB_REAL);
2447                                 master->slaves[x]->master = NULL;
2448                                 master->slaves[x] = NULL;
2449                         } else
2450                                 hasslaves = 1;
2451                 }
2452                 if (!hasslaves)
2453                         master->inconference = 0;
2454         }
2455         if (!slave) {
2456                 if (master->master) {
2457                         /* Take master out of the conference */
2458                         conf_del(master->master, &master->subs[SUB_REAL], SUB_REAL);
2459                         conf_del(master, &master->master->subs[SUB_REAL], SUB_REAL);
2460                         hasslaves = 0;
2461                         for (x=0;x<MAX_SLAVES;x++) {
2462                                 if (master->master->slaves[x] == master)
2463                                         master->master->slaves[x] = NULL;
2464                                 else if (master->master->slaves[x])
2465                                         hasslaves = 1;
2466                         }
2467                         if (!hasslaves)
2468                                 master->master->inconference = 0;
2469                 }
2470                 master->master = NULL;
2471         }
2472         update_conf(master);
2473         if (needlock) {
2474                 if (slave)
2475                         ast_mutex_unlock(&slave->lock);
2476                 ast_mutex_unlock(&master->lock);
2477         }
2478 }
2479
2480 static void zt_link(struct zt_pvt *slave, struct zt_pvt *master) {
2481         int x;
2482         if (!slave || !master) {
2483                 ast_log(LOG_WARNING, "Tried to link to/from NULL??\n");
2484                 return;
2485         }
2486         for (x=0;x<MAX_SLAVES;x++) {
2487                 if (!master->slaves[x]) {
2488                         master->slaves[x] = slave;
2489                         break;
2490                 }
2491         }
2492         if (x >= MAX_SLAVES) {
2493                 ast_log(LOG_WARNING, "Replacing slave %d with new slave, %d\n", master->slaves[MAX_SLAVES - 1]->channel, slave->channel);
2494                 master->slaves[MAX_SLAVES - 1] = slave;
2495         }
2496         if (slave->master) 
2497                 ast_log(LOG_WARNING, "Replacing master %d with new master, %d\n", slave->master->channel, master->channel);
2498         slave->master = master;
2499         
2500         ast_log(LOG_DEBUG, "Making %d slave to master %d at %d\n", slave->channel, master->channel, x);
2501 }
2502
2503 static int zt_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags, struct ast_frame **fo, struct ast_channel **rc)
2504 {
2505         struct ast_channel *who = NULL, *cs[3];
2506         struct zt_pvt *p0, *p1, *op0, *op1;
2507         struct zt_pvt *master=NULL, *slave=NULL;
2508         struct ast_frame *f;
2509         int to;
2510         int inconf = 0;
2511         int nothingok = 0;
2512         int ofd1, ofd2;
2513         int oi1, oi2, i1 = -1, i2 = -1, t1, t2;
2514         int os1 = -1, os2 = -1;
2515         struct ast_channel *oc1, *oc2;
2516
2517         /* if need DTMF, cant native bridge */
2518         if (flags & (AST_BRIDGE_DTMF_CHANNEL_0 | AST_BRIDGE_DTMF_CHANNEL_1))
2519                 return -2;
2520                 
2521         ast_mutex_lock(&c0->lock);
2522         ast_mutex_lock(&c1->lock);
2523
2524         p0 = c0->pvt->pvt;
2525         p1 = c1->pvt->pvt;
2526         /* cant do pseudo-channels here */
2527         if (!p0 || (!p0->sig) || !p1 || (!p1->sig)) {
2528                 ast_mutex_unlock(&c0->lock);
2529                 ast_mutex_unlock(&c1->lock);
2530                 return -2;
2531         }
2532
2533         op0 = p0 = c0->pvt->pvt;
2534         op1 = p1 = c1->pvt->pvt;
2535         ofd1 = c0->fds[0];
2536         ofd2 = c1->fds[0];
2537         oi1 = zt_get_index(c0, p0, 0);
2538         oi2 = zt_get_index(c1, p1, 0);
2539         oc1 = p0->owner;
2540         oc2 = p1->owner;
2541         if ((oi1 < 0) || (oi2 < 0)) {
2542                 ast_mutex_unlock(&c0->lock);
2543                 ast_mutex_unlock(&c1->lock);
2544                 return -1;
2545         }
2546
2547
2548
2549         ast_mutex_lock(&p0->lock);
2550         if (ast_mutex_trylock(&p1->lock)) {
2551                 /* Don't block, due to potential for deadlock */
2552                 ast_mutex_unlock(&p0->lock);
2553                 ast_mutex_unlock(&c0->lock);
2554                 ast_mutex_unlock(&c1->lock);
2555                 ast_log(LOG_NOTICE, "Avoiding deadlock...\n");
2556                 return -3;
2557         }
2558         if ((oi1 == SUB_REAL) && (oi2 == SUB_REAL)) {
2559                 if (!p0->owner || !p1->owner) {
2560                         /* Currently unowned -- Do nothing.  */
2561                         nothingok = 1;
2562                 } else {
2563                         /* If we don't have a call-wait in a 3-way, and we aren't in a 3-way, we can be master */
2564                         if (!p0->subs[SUB_CALLWAIT].inthreeway && !p1->subs[SUB_REAL].inthreeway) {
2565                                 master = p0;
2566                                 slave = p1;
2567                                 inconf = 1;
2568                         } else if (!p1->subs[SUB_CALLWAIT].inthreeway && !p0->subs[SUB_REAL].inthreeway) {
2569                                 master = p1;
2570                                 slave = p0;
2571                                 inconf = 1;
2572                         } else {
2573                                 ast_log(LOG_WARNING, "Huh?  Both calls are callwaits or 3-ways?  That's clever...?\n");
2574                                 ast_log(LOG_WARNING, "p0: chan %d/%d/CW%d/3W%d, p1: chan %d/%d/CW%d/3W%d\n", p0->channel, oi1, (p0->subs[SUB_CALLWAIT].zfd > -1) ? 1 : 0, p0->subs[SUB_REAL].inthreeway,
2575                                                 p0->channel, oi1, (p1->subs[SUB_CALLWAIT].zfd > -1) ? 1 : 0, p1->subs[SUB_REAL].inthreeway);
2576                         }
2577                 }
2578         } else if ((oi1 == SUB_REAL) && (oi2 == SUB_THREEWAY)) {
2579                 if (p1->subs[SUB_THREEWAY].inthreeway) {
2580                         master = p1;
2581                         slave = p0;
2582                 } else {
2583                         nothingok = 1;
2584                 }
2585         } else if ((oi1 == SUB_THREEWAY) && (oi2 == SUB_REAL)) {
2586                 if (p0->subs[SUB_THREEWAY].inthreeway) {
2587                         master = p0;
2588                         slave = p1;
2589                 } else {
2590                         nothingok  = 1;
2591                 }
2592         } else if ((oi1 == SUB_REAL) && (oi2 == SUB_CALLWAIT)) {
2593                 /* We have a real and a call wait.  If we're in a three way call, put us in it, otherwise, 
2594                    don't put us in anything */
2595                 if (p1->subs[SUB_CALLWAIT].inthreeway) {
2596                         master = p1;
2597                         slave = p0;
2598                 } else {
2599                         nothingok = 1;
2600                 }
2601         } else if ((oi1 == SUB_CALLWAIT) && (oi2 == SUB_REAL)) {
2602                 /* Same as previous */
2603                 if (p0->subs[SUB_CALLWAIT].inthreeway) {
2604                         master = p0;
2605                         slave = p1;
2606                 } else {
2607                         nothingok = 1;
2608                 }
2609         }
2610         ast_log(LOG_DEBUG, "master: %d, slave: %d, nothingok: %d\n",
2611                 master ? master->channel : 0, slave ? slave->channel : 0, nothingok);
2612         if (master && slave) {
2613                 /* Stop any tones, or play ringtone as appropriate.  If they're bridged
2614                    in an active threeway call with a channel that is ringing, we should
2615                    indicate ringing. */
2616                 if ((oi2 == SUB_THREEWAY) && 
2617                         p1->subs[SUB_THREEWAY].inthreeway && 
2618                         p1->subs[SUB_REAL].owner && 
2619                         p1->subs[SUB_REAL].inthreeway && 
2620                         (p1->subs[SUB_REAL].owner->_state == AST_STATE_RINGING)) {
2621                                 ast_log(LOG_DEBUG, "Playing ringback on %s since %s is in a ringing three-way\n", c0->name, c1->name);
2622                                 tone_zone_play_tone(p0->subs[oi1].zfd, ZT_TONE_RINGTONE);
2623                                 os2 = p1->subs[SUB_REAL].owner->_state;
2624                 } else {
2625                                 ast_log(LOG_DEBUG, "Stoping tones on %d/%d talking to %d/%d\n", p0->channel, oi1, p1->channel, oi2);
2626                                 tone_zone_play_tone(p0->subs[oi1].zfd, -1);
2627                 }
2628                 if ((oi1 == SUB_THREEWAY) && 
2629                         p0->subs[SUB_THREEWAY].inthreeway && 
2630                         p0->subs[SUB_REAL].owner && 
2631                         p0->subs[SUB_REAL].inthreeway && 
2632                         (p0->subs[SUB_REAL].owner->_state == AST_STATE_RINGING)) {
2633                                 ast_log(LOG_DEBUG, "Playing ringback on %s since %s is in a ringing three-way\n", c1->name, c0->name);
2634                                 tone_zone_play_tone(p1->subs[oi2].zfd, ZT_TONE_RINGTONE);
2635                                 os1 = p0->subs[SUB_REAL].owner->_state;
2636                 } else {
2637                                 ast_log(LOG_DEBUG, "Stoping tones on %d/%d talking to %d/%d\n", p1->channel, oi2, p0->channel, oi1);
2638                                 tone_zone_play_tone(p1->subs[oi1].zfd, -1);
2639                 }
2640                 if ((oi1 == SUB_REAL) && (oi2 == SUB_REAL)) {
2641                         if (!p0->echocanbridged || !p1->echocanbridged) {
2642                                 /* Disable echo cancellation if appropriate */
2643                                 zt_disable_ec(p0);
2644                                 zt_disable_ec(p1);
2645                         }
2646                 }
2647                 zt_link(slave, master);
2648                 master->inconference = inconf;
2649         } else if (!nothingok)
2650                 ast_log(LOG_WARNING, "Can't link %d/%s with %d/%s\n", p0->channel, subnames[oi1], p1->channel, subnames[oi2]);
2651
2652         update_conf(p0);
2653         update_conf(p1);
2654         t1 = p0->subs[SUB_REAL].inthreeway;
2655         t2 = p1->subs[SUB_REAL].inthreeway;
2656
2657         ast_mutex_unlock(&p0->lock);
2658         ast_mutex_unlock(&p1->lock);
2659
2660         ast_mutex_unlock(&c0->lock);
2661         ast_mutex_unlock(&c1->lock);
2662
2663         /* Native bridge failed */
2664         if ((!master || !slave) && !nothingok) {
2665                 if (op0 == p0)
2666                         zt_enable_ec(p0);
2667                 if (op1 == p1)
2668                         zt_enable_ec(p1);
2669                 return -1;
2670         }
2671         
2672         cs[0] = c0;
2673         cs[1] = c1;
2674         cs[2] = NULL;
2675         for (;;) {
2676                 /* Here's our main loop...  Start by locking things, looking for private parts, 
2677                    and then balking if anything is wrong */
2678                 ast_mutex_lock(&c0->lock);
2679                 ast_mutex_lock(&c1->lock);
2680                 p0 = c0->pvt->pvt;
2681                 p1 = c1->pvt->pvt;
2682                 if (op0 == p0)
2683                         i1 = zt_get_index(c0, p0, 1);
2684                 if (op1 == p1)
2685                         i2 = zt_get_index(c1, p1, 1);
2686                 ast_mutex_unlock(&c0->lock);
2687                 ast_mutex_unlock(&c1->lock);
2688                 if ((op0 != p0) || (op1 != p1) || 
2689                     (ofd1 != c0->fds[0]) || 
2690                         (ofd2 != c1->fds[0]) ||
2691                     (p0->subs[SUB_REAL].owner && (os1 > -1) && (os1 != p0->subs[SUB_REAL].owner->_state)) || 
2692                     (p1->subs[SUB_REAL].owner && (os2 > -1) && (os2 != p1->subs[SUB_REAL].owner->_state)) || 
2693                     (oc1 != p0->owner) || 
2694                         (oc2 != p1->owner) ||
2695                         (t1 != p0->subs[SUB_REAL].inthreeway) ||
2696                         (t2 != p1->subs[SUB_REAL].inthreeway) ||
2697                         (oi1 != i1) ||
2698                         (oi2 != i2)) {
2699                         if (slave && master)
2700                                 zt_unlink(slave, master, 1);
2701                         ast_log(LOG_DEBUG, "Something changed out on %d/%d to %d/%d, returning -3 to restart\n",
2702                                                                         op0->channel, oi1, op1->channel, oi2);
2703                         if (op0 == p0)
2704                                 zt_enable_ec(p0);
2705                         if (op1 == p1)
2706                                 zt_enable_ec(p1);
2707                         return -3;
2708                 }
2709                 to = -1;
2710                 who = ast_waitfor_n(cs, 2, &to);
2711                 if (!who) {
2712                         ast_log(LOG_DEBUG, "Ooh, empty read...\n");
2713                         continue;
2714                 }
2715                 if (who->pvt->pvt == op0) 
2716                         op0->ignoredtmf = 1;
2717                 else if (who->pvt->pvt == op1)
2718                         op1->ignoredtmf = 1;
2719                 f = ast_read(who);
2720                 if (who->pvt->pvt == op0) 
2721                         op0->ignoredtmf = 0;
2722                 else if (who->pvt->pvt == op1)
2723                         op1->ignoredtmf = 0;
2724                 if (!f) {
2725                         *fo = NULL;
2726                         *rc = who;
2727                         if (slave && master)
2728                                 zt_unlink(slave, master, 1);
2729                         if (op0 == p0)
2730                                 zt_enable_ec(p0);
2731                         if (op1 == p1)
2732                                 zt_enable_ec(p1);
2733                         return 0;
2734                 }
2735                 if (f->frametype == AST_FRAME_DTMF) {
2736                         if (((who == c0) && (flags & AST_BRIDGE_DTMF_CHANNEL_0)) || 
2737                             ((who == c1) && (flags & AST_BRIDGE_DTMF_CHANNEL_1))) {
2738                                 *fo = f;
2739                                 *rc = who;
2740                                 if (slave && master)
2741                                         zt_unlink(slave, master, 1);
2742                                 return 0;
2743                         } else if ((who == c0) && p0->pulsedial) {
2744                                 ast_write(c1, f);
2745                         } else if ((who == c1) && p1->pulsedial) {
2746                                 ast_write(c0, f);
2747                         }
2748                 }
2749                 ast_frfree(f);
2750
2751                 /* Swap who gets priority */
2752                 cs[2] = cs[0];
2753                 cs[0] = cs[1];
2754                 cs[1] = cs[2];
2755         }
2756 }
2757
2758 static int zt_indicate(struct ast_channel *chan, int condition);
2759
2760 static int zt_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
2761 {
2762         struct zt_pvt *p = newchan->pvt->pvt;
2763         int x;
2764         ast_mutex_lock(&p->lock);
2765         ast_log(LOG_DEBUG, "New owner for channel %d is %s\n", p->channel, newchan->name);
2766         if (p->owner == oldchan) {
2767                 p->owner = newchan;
2768         }
2769         for (x=0;x<3;x++)
2770                 if (p->subs[x].owner == oldchan) {
2771                         if (!x)
2772                                 zt_unlink(NULL, p, 0);
2773                         p->subs[x].owner = newchan;
2774                 }
2775         if (newchan->_state == AST_STATE_RINGING) 
2776                 zt_indicate(newchan, AST_CONTROL_RINGING);
2777         update_conf(p);
2778         ast_mutex_unlock(&p->lock);
2779         return 0;
2780 }
2781
2782 static int zt_ring_phone(struct zt_pvt *p)
2783 {
2784         int x;
2785         int res;
2786         /* Make sure our transmit state is on hook */
2787         x = 0;
2788         x = ZT_ONHOOK;
2789         res = ioctl(p->subs[SUB_REAL].zfd, ZT_HOOK, &x);
2790         do {
2791                 x = ZT_RING;
2792                 res = ioctl(p->subs[SUB_REAL].zfd, ZT_HOOK, &x);
2793 #if 0
2794                 printf("Res: %d, error: %s\n", res, strerror(errno));
2795 #endif                                          
2796                 if (res) {
2797                         switch(errno) {
2798                         case EBUSY:
2799                         case EINTR:
2800                                 /* Wait just in case */
2801                                 usleep(10000);
2802                                 continue;
2803                         case EINPROGRESS:
2804                                 res = 0;
2805                                 break;
2806                         default:
2807                                 ast_log(LOG_WARNING, "Couldn't ring the phone: %s\n", strerror(errno));
2808                                 res = 0;
2809                         }
2810                 }
2811         } while (res);
2812         return res;
2813 }
2814
2815 static void *ss_thread(void *data);
2816
2817 static struct ast_channel *zt_new(struct zt_pvt *, int, int, int, int, int);
2818
2819 static int attempt_transfer(struct zt_pvt *p)
2820 {
2821         /* In order to transfer, we need at least one of the channels to
2822            actually be in a call bridge.  We can't conference two applications
2823            together (but then, why would we want to?) */
2824         if (p->subs[SUB_REAL].owner->bridge) {
2825                 /* The three-way person we're about to transfer to could still be in MOH, so
2826                    stop if now if appropriate */
2827                 if (p->subs[SUB_THREEWAY].owner->bridge)
2828                         ast_moh_stop(p->subs[SUB_THREEWAY].owner->bridge);
2829                 if (p->subs[SUB_THREEWAY].owner->_state == AST_STATE_RINGING) {
2830                         ast_indicate(p->subs[SUB_REAL].owner->bridge, AST_CONTROL_RINGING);
2831                 }
2832                 if (ast_channel_masquerade(p->subs[SUB_THREEWAY].owner, p->subs[SUB_REAL].owner->bridge)) {
2833                         ast_log(LOG_WARNING, "Unable to masquerade %s as %s\n",
2834                                         p->subs[SUB_REAL].owner->bridge->name, p->subs[SUB_THREEWAY].owner->name);
2835                         return -1;
2836                 }
2837                 /* Orphan the channel */
2838                 unalloc_sub(p, SUB_THREEWAY);
2839         } else if (p->subs[SUB_THREEWAY].owner->bridge) {
2840                 if (p->subs[SUB_REAL].owner->_state == AST_STATE_RINGING) {
2841                         ast_indicate(p->subs[SUB_THREEWAY].owner->bridge, AST_CONTROL_RINGING);
2842                 }
2843                 ast_moh_stop(p->subs[SUB_THREEWAY].owner->bridge);
2844                 if (ast_channel_masquerade(p->subs[SUB_REAL].owner, p->subs[SUB_THREEWAY].owner->bridge)) {
2845                         ast_log(LOG_WARNING, "Unable to masquerade %s as %s\n",
2846                                         p->subs[SUB_THREEWAY].owner->bridge->name, p->subs[SUB_REAL].owner->name);
2847                         return -1;
2848                 }
2849                 swap_subs(p, SUB_THREEWAY, SUB_REAL);
2850                 unalloc_sub(p, SUB_THREEWAY);
2851                 /* Tell the caller not to hangup */
2852                 return 1;
2853         } else {
2854                 ast_log(LOG_DEBUG, "Neither %s nor %s are in a bridge, nothing to transfer\n",
2855                                         p->subs[SUB_REAL].owner->name, p->subs[SUB_THREEWAY].owner->name);
2856                 p->subs[SUB_THREEWAY].owner->_softhangup |= AST_SOFTHANGUP_DEV;
2857         }
2858         return 0;
2859 }
2860
2861 #ifdef ZAPATA_R2
2862 static struct ast_frame *handle_r2_event(struct zt_pvt *p, mfcr2_event_t *e, int index)
2863 {
2864         struct ast_frame *f;
2865         f = &p->subs[index].f;
2866         if (!p->r2) {
2867                 ast_log(LOG_WARNING, "Huh?  No R2 structure :(\n");
2868                 return NULL;
2869         }
2870         switch(e->e) {
2871         case MFCR2_EVENT_BLOCKED:
2872                 if (option_verbose > 2)
2873                         ast_verbose(VERBOSE_PREFIX_3 "Channel %d blocked\n", p->channel);
2874                 break;
2875         case MFCR2_EVENT_UNBLOCKED:
2876                 if (option_verbose > 2)
2877                         ast_verbose(VERBOSE_PREFIX_3 "Channel %d unblocked\n", p->channel);
2878                 break;
2879         case MFCR2_EVENT_CONFIG_ERR:
2880                 if (option_verbose > 2)
2881                         ast_verbose(VERBOSE_PREFIX_3 "Config error on channel %d\n", p->channel);
2882                 break;
2883         case MFCR2_EVENT_RING:
2884                 if (option_verbose > 2)
2885                         ast_verbose(VERBOSE_PREFIX_3 "Ring on channel %d\n", p->channel);
2886                 break;
2887         case MFCR2_EVENT_HANGUP:
2888                 if (option_verbose > 2)
2889                         ast_verbose(VERBOSE_PREFIX_3 "Hangup on channel %d\n", p->channel);
2890                 break;
2891         case MFCR2_EVENT_RINGING:
2892                 if (option_verbose > 2)
2893                         ast_verbose(VERBOSE_PREFIX_3 "Ringing on channel %d\n", p->channel);
2894                 break;
2895         case MFCR2_EVENT_ANSWER:
2896                 if (option_verbose > 2)
2897                         ast_verbose(VERBOSE_PREFIX_3 "Answer on channel %d\n", p->channel);
2898                 break;
2899         case MFCR2_EVENT_HANGUP_ACK:
2900                 if (option_verbose > 2)
2901                         ast_verbose(VERBOSE_PREFIX_3 "Hangup ACK on channel %d\n", p->channel);
2902                 break;
2903         case MFCR2_EVENT_IDLE:
2904                 if (option_verbose > 2)
2905                         ast_verbose(VERBOSE_PREFIX_3 "Idle on channel %d\n", p->channel);
2906                 break;
2907         default:
2908                 ast_log(LOG_WARNING, "Unknown MFC/R2 event %d\n", e->e);
2909                 break;
2910         }
2911         return f;
2912 }
2913
2914 static mfcr2_event_t *r2_get_event_bits(struct zt_pvt *p)
2915 {
2916         int x;
2917         int res;
2918         mfcr2_event_t *e;
2919         res = ioctl(p->subs[SUB_REAL].zfd, ZT_GETRXBITS, &x);
2920         if (res) {
2921                 ast_log(LOG_WARNING, "Unable to check received bits\n");
2922                 return NULL;
2923         }
2924         if (!p->r2) {
2925                 ast_log(LOG_WARNING, "Odd, no R2 structure on channel %d\n", p->channel);
2926                 return NULL;
2927         }
2928         e = mfcr2_cas_signaling_event(p->r2, x);
2929         return e;
2930 }
2931 #endif
2932
2933 static int check_for_conference(struct zt_pvt *p)
2934 {
2935         ZT_CONFINFO ci;
2936         /* Fine if we already have a master, etc */
2937         if (p->master || (p->confno > -1))
2938                 return 0;
2939         memset(&ci, 0, sizeof(ci));
2940         if (ioctl(p->subs[SUB_REAL].zfd, ZT_GETCONF, &ci)) {
2941                 ast_log(LOG_WARNING, "Failed to get conference info on channel %d\n", p->channel);
2942                 return 0;
2943         }
2944         /* If we have no master and don't have a confno, then 
2945            if we're in a conference, it's probably a MeetMe room or
2946            some such, so don't let us 3-way out! */
2947         if ((p->subs[SUB_REAL].curconf.confno != ci.confno) || (p->subs[SUB_REAL].curconf.confmode != ci.confmode)) {
2948                 if (option_verbose > 2) 
2949                         ast_verbose(VERBOSE_PREFIX_3 "Avoiding 3-way call when in an external conference\n");
2950                 return 1;
2951         }
2952         return 0;
2953 }
2954
2955 static int get_alarms(struct zt_pvt *p)
2956 {
2957         int res;
2958         ZT_SPANINFO zi;
2959         memset(&zi, 0, sizeof(zi));
2960         zi.spanno = p->span;
2961         res = ioctl(p->subs[SUB_REAL].zfd, ZT_SPANSTAT, &zi);
2962         if (res < 0) {
2963                 ast_log(LOG_WARNING, "Unable to determine alarm on channel %d\n", p->channel);
2964                 return 0;
2965         }
2966         return zi.alarms;
2967 }
2968                         
2969 static struct ast_frame *zt_handle_event(struct ast_channel *ast)
2970 {
2971         int res,x;
2972         int index;
2973         char *c;
2974         struct zt_pvt *p = ast->pvt->pvt;
2975         pthread_t threadid;
2976         pthread_attr_t attr;
2977         struct ast_channel *chan;
2978         pthread_attr_init(&attr);
2979         pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
2980         index = zt_get_index(ast, p, 0);
2981         p->subs[index].f.frametype = AST_FRAME_NULL;
2982         p->subs[index].f.datalen = 0;
2983         p->subs[index].f.samples = 0;
2984         p->subs[index].f.mallocd = 0;
2985         p->subs[index].f.offset = 0;
2986         p->subs[index].f.src = "zt_handle_event";
2987         p->subs[index].f.data = NULL;
2988         if (index < 0)
2989                 return &p->subs[index].f;
2990         if (p->fake_event) {
2991                 res = p->fake_event;
2992                 p->fake_event = 0;
2993         } else
2994                 res = zt_get_event(p->subs[index].zfd);
2995         ast_log(LOG_DEBUG, "Got event %s(%d) on channel %d (index %d)\n", event2str(res), res, p->channel, index);
2996         if (res & (ZT_EVENT_PULSE