/*
 * Asterisk -- A telephony toolkit for Linux.
 *
 * Trivial application to dial a channel
 * 
 * Copyright (C) 1999, Mark Spencer
 *
 * Mark Spencer <markster@linux-support.net>
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License
 */

#include <asterisk/file.h>
#include <asterisk/logger.h>
#include <asterisk/channel.h>
#include <asterisk/pbx.h>
#include <asterisk/options.h>
#include <asterisk/module.h>
#include <asterisk/translate.h>
#include <asterisk/say.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/time.h>
#include <sys/signal.h>
#include <netinet/in.h>

#include <pthread.h>

static char *tdesc = "Dialing/Parking Application";

static char *app = "Dial";

static char *parkedcall = "ParkedCall";

static char *synopsis = "Place an call and connect to the current channel";

static char *registrar = "app_dial";

static char *descrip =
"  Dial(Technology/resource[&Technology2/resource2...][|timeout][|transfer]):\n"
"Requests  one  or more channels and places specified outgoing calls on them.\n"
"As soon as a  channel  answers, the  Dial  app  will  answer the originating\n"
"channel (if it needs to be answered) and will bridge a call with the channel\n"
"which first answered. All other calls placed by the Dial app will be hunp up\n"
"If a timeout is not specified, the Dial  application  will wait indefinitely\n"
"until either one of the  called channels  answers, the user hangs up, or all\n"
"channels return busy or  error. In general,  the dialler will return 0 if it\n"
"was  unable  to  place  the  call, or the timeout expired.  However, if  all\n"
"channels were busy, and there exists an extension with priority n+101 (where\n"
"n is the priority of  the  dialler  instance), then  it  will  be  the  next\n"
"executed extension (this allows you to setup different behavior on busy from\n"
"no-answer).\n"
"  This application returns -1 if the originating channel hangs up, or if the\n"
"call is bridged and  either of the parties in the bridge terminate the call.\n"
"The transfer string may contain  a  't' to  allow the called user transfer a\n"
"call or 'T' to allow the calling user to transfer the call.\n"
"  In addition to transferring the call, a call may be parked and then picked\n"
"up by another user.\n";

/* No more than 45 seconds parked before you do something with them */
static int parkingtime = 45000;

/* Context for which parking is made accessible */
static char parking_con[AST_MAX_EXTENSION] = "parkedcalls";

/* Extension you type to park the call */
static char parking_ext[AST_MAX_EXTENSION] = "700";

/* First available extension for parking */
static int parking_start = 701;

/* Last available extension for parking */
static int parking_stop = 750;

/* We define a customer "local user" structure because we
   use it not only for keeping track of what is in use but
   also for keeping track of who we're dialing. */

struct localuser {
	struct ast_channel *chan;
	int stillgoing;
	int allowredirect;
	struct localuser *next;
};

struct parkeduser {
	struct ast_channel *chan;
	struct timeval start;
	int parkingnum;
	/* Where to go if our parking time expires */
	char context[AST_MAX_EXTENSION];
	char exten[AST_MAX_EXTENSION];
	int priority;
	struct parkeduser *next;
};

static struct parkeduser *parkinglot;

static pthread_mutex_t parking_lock = PTHREAD_MUTEX_INITIALIZER;

static pthread_t parking_thread;

LOCAL_USER_DECL;

static int bridge_call(struct ast_channel *chan, struct ast_channel *peer, int allowredirect);


static int park_call(struct ast_channel *chan, struct ast_channel *peer)
{
	/* We put the user in the parking list, then wake up the parking thread to be sure it looks
	   after these channels too */
	struct parkeduser *pu, *cur;
	int x;
	pu = malloc(sizeof(struct parkeduser));
	if (pu) {
		ast_pthread_mutex_lock(&parking_lock);
		for (x=parking_start;x<=parking_stop;x++) {
			cur = parkinglot;
			while(cur) {
				if (cur->parkingnum == x) 
					break;
				cur = cur->next;
			}
			if (!cur)
				break;
		}
		if (x <= parking_stop) {
			pu->chan = chan;
			gettimeofday(&pu->start, NULL);
			pu->parkingnum = x;
			/* Remember what had been dialed, so that if the parking
			   expires, we try to come back to the same place */
			strncpy(pu->context, chan->context, sizeof(pu->context));
			strncpy(pu->exten, chan->exten, sizeof(pu->exten));
			pu->priority = chan->priority;
			pu->next = parkinglot;
			parkinglot = pu;
			ast_pthread_mutex_unlock(&parking_lock);
			/* Wake up the (presumably select()ing) thread */
			pthread_kill(parking_thread, SIGURG);
			if (option_verbose > 1) 
				ast_verbose(VERBOSE_PREFIX_2 "Parked %s on %d\n", pu->chan->name, pu->parkingnum);
			ast_say_digits(peer, pu->parkingnum, peer->language);
			return 0;
		} else {
			ast_log(LOG_WARNING, "No more parking spaces\n");
			free(pu);
			ast_pthread_mutex_unlock(&parking_lock);
			return -1;
		}
	} else {
		ast_log(LOG_WARNING, "Out of memory\n");
		return -1;
	}
	return 0;
}

static void *do_parking_thread(void *ignore)
{
	int ms, tms, max;
	struct parkeduser *pu, *pl, *pt = NULL;
	struct timeval tv;
	struct ast_frame *f;
	int x;
	fd_set rfds, efds;
	fd_set nrfds, nefds;
	FD_ZERO(&rfds);
	FD_ZERO(&efds);
	for (;;) {
		ms = -1;
		max = -1;
		ast_pthread_mutex_lock(&parking_lock);
		pl = NULL;
		pu = parkinglot;
		gettimeofday(&tv, NULL);
		FD_ZERO(&nrfds);
		FD_ZERO(&nefds);
		while(pu) {
			tms = (tv.tv_sec - pu->start.tv_sec) * 1000 + (tv.tv_usec - pu->start.tv_usec) / 1000;
			if (tms > parkingtime) {
				/* They've been waiting too long, send them back to where they came.  Theoretically they
				   should have their original extensions and such, but we copy to be on the safe side */
				strncpy(pu->chan->exten, pu->exten, sizeof(pu->chan->exten));
				strncpy(pu->chan->context, pu->context, sizeof(pu->chan->context));
				pu->chan->priority = pu->priority;
				/* Start up the PBX, or hang them up */
				if (ast_pbx_start(pu->chan))  {
					ast_log(LOG_WARNING, "Unable to restart the PBX for user on '%s', hanging them up...\n", pu->chan->name);
					ast_hangup(pu->chan);
				}
				/* And take them out of the parking lot */
				if (pl) 
					pl->next = pu->next;
				else
					parkinglot = pu->next;
				pt = pu;
				pu = pu->next;
				free(pt);
			} else {
				for (x=0;x<AST_MAX_FDS;x++) {
					if ((pu->chan->fds[x] > -1) && (FD_ISSET(pu->chan->fds[x], &rfds) || FD_ISSET(pu->chan->fds[x], &efds))) {
							if (FD_ISSET(pu->chan->fds[x], &efds))
								pu->chan->exception = 1;
							pu->chan->fdno = x;
							/* See if they need servicing */
							f = ast_read(pu->chan);
							if (!f || ((f->frametype == AST_FRAME_CONTROL) && (f->subclass ==  AST_CONTROL_HANGUP))) {
							/* There's a problem, hang them up*/
							if (option_verbose > 1) 
								ast_verbose(VERBOSE_PREFIX_2 "%s got tired of being parked\n", pu->chan->name);
							ast_hangup(pu->chan);
							/* And take them out of the parking lot */
							if (pl) 
								pl->next = pu->next;
							else
								parkinglot = pu->next;
							pt = pu;
							pu = pu->next;
							free(pt);
							break;
						} else {
							/* XXX Maybe we could do something with packets, like dial "0" for operator or something XXX */
							ast_frfree(f);
							goto std;	/* XXX Ick: jumping into an else statement??? XXX */
						}
					}
				}
				if (x >= AST_MAX_FDS) {
					/* Keep this one for next one */
std:				FD_SET(pu->chan->fds[x], &nrfds);
					FD_SET(pu->chan->fds[x], &nefds);
					/* Keep track of our longest wait */
					if ((tms < ms) || (ms < 0))
						ms = tms;
					if (pu->chan->fds[x] > max)
						max = pu->chan->fds[x];
					pl = pu;
					pu = pu->next;
				}
			}
		}
		ast_pthread_mutex_unlock(&parking_lock);
		rfds = nrfds;
		efds = nefds;
		tv.tv_sec = ms / 1000;
		tv.tv_usec = (ms % 1000) * 1000;
		/* Wait for something to happen */
		select(max + 1, &rfds, NULL, &efds, (ms > -1) ? &tv : NULL);
		pthread_testcancel();
	}
	return NULL;	/* Never reached */
}

static void hanguptree(struct localuser *outgoing, struct ast_channel *exception)
{
	/* Hang up a tree of stuff */
	struct localuser *oo;
	while(outgoing) {
		/* Hangup any existing lines we have open */
		if (outgoing->chan != exception)
			ast_hangup(outgoing->chan);
		oo = outgoing;
		outgoing=outgoing->next;
		free(oo);
	}
}

#define MAX 256

static struct ast_channel *wait_for_answer(struct ast_channel *in, struct localuser *outgoing, int *to, int *allowredir)
{
	struct localuser *o;
	int found;
	int numlines;
	int sentringing = 0;
	int numbusies = 0;
	int orig = *to;
	struct ast_frame *f;
	struct ast_channel *peer = NULL;
	struct ast_channel *watchers[MAX];
	int pos;
	int single;
	struct ast_channel *winner;
	
	single = (outgoing && !outgoing->next);
	
	if (single) {
		/* If we are calling a single channel, make them compatible for in-band tone purpose */
		ast_channel_make_compatible(outgoing->chan, in);
	}
	
	while(*to && !peer) {
		o = outgoing;
		found = -1;
		pos = 1;
		numlines = 0;
		watchers[0] = in;
		while(o) {
			/* Keep track of important channels */
			if (o->stillgoing) {
				watchers[pos++] = o->chan;
				found = 1;
			}
			o = o->next;
			numlines++;
		}
		if (found < 0) {
			if (numlines == numbusies) {
				if (option_verbose > 2)
					ast_verbose( VERBOSE_PREFIX_2 "Everyone is busy at this time\n");
				/* See if there is a special busy message */
				if (ast_exists_extension(in, in->context, in->exten, in->priority + 101, in->callerid)) 
					in->priority+=100;
			} else {
				if (option_verbose > 2)
					ast_verbose( VERBOSE_PREFIX_2 "No one is available to answer at this time\n");
			}
			*to = 0;
			return NULL;
		}
		winner = ast_waitfor_n(watchers, pos, to);
		o = outgoing;
		while(o) {
			if (o->chan == winner) {
				f = ast_read(winner);
				if (f) {
					if (f->frametype == AST_FRAME_CONTROL) {
						switch(f->subclass) {
					    case AST_CONTROL_ANSWER:
							/* This is our guy if someone answered. */
							if (!peer) {
								if (option_verbose > 2)
									ast_verbose( VERBOSE_PREFIX_3 "%s answered %s\n", o->chan->name, in->name);
								peer = o->chan;
								*allowredir = o->allowredirect;
							}
							break;
						case AST_CONTROL_BUSY:
							if (option_verbose > 2)
								ast_verbose( VERBOSE_PREFIX_3 "%s is busy\n", o->chan->name);
							o->stillgoing = 0;
							numbusies++;
							break;
						case AST_CONTROL_CONGESTION:
							if (option_verbose > 2)
								ast_verbose( VERBOSE_PREFIX_3 "%s is circuit-busy\n", o->chan->name);
							o->stillgoing = 0;
							numbusies++;
							break;
						case AST_CONTROL_RINGING:
							if (option_verbose > 2)
								ast_verbose( VERBOSE_PREFIX_3 "%s is ringing\n", o->chan->name);
							if (!sentringing) {
								ast_indicate(in, AST_CONTROL_RINGING);
								sentringing++;
							}
							break;
						case AST_CONTROL_OFFHOOK:
							/* Ignore going off hook */
							break;
						default:
							ast_log(LOG_DEBUG, "Dunno what to do with control type %d\n", f->subclass);
						}
					} else if (single && (f->frametype == AST_FRAME_VOICE)) {
						if (ast_write(in, f)) 
							ast_log(LOG_WARNING, "Unable to forward frame\n");
					} else if (single && (f->frametype == AST_FRAME_IMAGE)) {
						if (ast_write(in, f))
							ast_log(LOG_WARNING, "Unable to forward image\n");
					}
					ast_frfree(f);
				} else {
					o->stillgoing = 0;
				}
			}
			o = o->next;
		}
		if (winner == in) {
			f = ast_read(in);
#if 0
			if (f && (f->frametype != AST_FRAME_VOICE))
					printf("Frame type: %d, %d\n", f->frametype, f->subclass);
			else if (!f || (f->frametype != AST_FRAME_VOICE))
				printf("Hangup received on %s\n", in->name);
#endif
			if (!f || ((f->frametype == AST_FRAME_CONTROL) && (f->subclass == AST_CONTROL_HANGUP))) {
				/* Got hung up */
				*to=-1;
				return NULL;
			}
		}
		if (!*to && (option_verbose > 2))
			ast_verbose( VERBOSE_PREFIX_3 "Nobody picked up in %d ms\n", orig);
	}
	return peer;
	
}

static int bridge_call(struct ast_channel *chan, struct ast_channel *peer, int allowredirect)
{
	/* Copy voice back and forth between the two channels.  Give the peer
	   the ability to transfer calls with '#<extension' syntax. */
	int len;
	struct ast_frame *f;
	struct ast_channel *who;
	char newext[256], *ptr;
	int res;
	struct ast_option_header *aoh;
	/* Answer if need be */
	if (chan->state != AST_STATE_UP) {
		if (ast_answer(chan))
			return -1;
	}
	peer->appl = "Bridged Call";
	peer->data = chan->name;
	for (;;) {
		res = ast_channel_bridge(chan, peer, allowredirect ? AST_BRIDGE_DTMF_CHANNEL_1 : 0, &f, &who);
		if (res < 0) {
			ast_log(LOG_WARNING, "Bridge failed on channels %s and %s\n", chan->name, peer->name);
			return -1;
		}
		
		if (!f || ((f->frametype == AST_FRAME_CONTROL) && ((f->subclass == AST_CONTROL_HANGUP) || (f->subclass == AST_CONTROL_BUSY) || 
			(f->subclass == AST_CONTROL_CONGESTION)))) {
				res = -1;
				break;
		}
		if ((f->frametype == AST_FRAME_CONTROL) && (f->subclass == AST_CONTROL_RINGING)) {
			if (who == chan)
				ast_indicate(peer, AST_CONTROL_RINGING);
			else
				ast_indicate(chan, AST_CONTROL_RINGING);
		}
		if ((f->frametype == AST_FRAME_CONTROL) && (f->subclass == AST_CONTROL_OPTION)) {
			aoh = f->data;
			/* Forward option Requests */
			if (aoh && (aoh->flag == AST_OPTION_FLAG_REQUEST)) {
				if (who == chan)
					ast_channel_setoption(peer, ntohs(aoh->option), aoh->data, f->datalen - sizeof(struct ast_option_header), 0);
				else
					ast_channel_setoption(chan, ntohs(aoh->option), aoh->data, f->datalen - sizeof(struct ast_option_header), 0);
			}
		}
		if ((f->frametype == AST_FRAME_DTMF) && (who == peer) && allowredirect &&
		     (f->subclass == '#')) {
				memset(newext, 0, sizeof(newext));
				ptr = newext;
					/* Transfer */
				if ((res=ast_streamfile(peer, "pbx-transfer", chan->language)))
					break;
				if ((res=ast_waitstream(peer, AST_DIGIT_ANY)) < 0)
					break;
				ast_stopstream(peer);
				if (res > 0) {
					/* If they've typed a digit already, handle it */
					newext[0] = res;
					ptr++;
					len --;
				}
				res = 0;
				while(strlen(newext) < sizeof(newext - 1)) {
					res = ast_waitfordigit(peer, 3000);
					if (res < 1)
						break;
					*(ptr++) = res;
					if (!ast_canmatch_extension(peer, peer->context, newext, 1, peer->callerid) ||
						ast_exists_extension(peer, peer->context, newext, 1, peer->callerid)) {
						res = 0;
						break;
					}
				}
				if (res)
					break;
				if (!strcmp(newext, parking_ext)) {
					if (!park_call(chan, peer)) {
						/* We return non-zero, but tell the PBX not to hang the channel when
						   the thread dies -- We have to be careful now though.  We are responsible for 
						   hanging up the channel, else it will never be hung up! */
						res=AST_PBX_KEEPALIVE;
						break;
					} else {
						ast_log(LOG_WARNING, "Unable to park call %s\n", chan->name);
					}
					/* XXX Maybe we should have another message here instead of invalid extension XXX */
				} else if (ast_exists_extension(chan, peer->context, newext, 1, peer->callerid)) {
					/* Set the channel's new extension, since it exists, using peer context */
					strncpy(chan->exten, newext, sizeof(chan->exten));
					strncpy(chan->context, peer->context, sizeof(chan->context));
					chan->priority = 0;
					ast_frfree(f);
					if (option_verbose > 2) 
						ast_verbose(VERBOSE_PREFIX_3 "Transferring %s to '%s' (context %s) priority 1\n", chan->name, chan->exten, chan->context);
					res=0;
					break;
				} else {
					if (option_verbose > 2)	
						ast_verbose(VERBOSE_PREFIX_3 "Unable to find extension '%s' in context %s\n", newext, peer->context);
				}
				res = ast_streamfile(peer, "pbx-invalid", chan->language);
				if (res)
					break;
				res = ast_waitstream(peer, AST_DIGIT_ANY);
				ast_stopstream(peer);
				res = 0;
			} else {
#if 1
				ast_log(LOG_DEBUG, "Read from %s (%d,%d)\n", who->name, f->frametype, f->subclass);
#endif
			}
	}
	return res;
}

static int park_exec(struct ast_channel *chan, void *data)
{
	int res=0;
	struct localuser *u;
	struct ast_channel *peer=NULL;
	struct parkeduser *pu, *pl=NULL;
	int park;
	if (!data) {
		ast_log(LOG_WARNING, "Park requires an argument (extension number)\n");
		return -1;
	}
	LOCAL_USER_ADD(u);
	park = atoi((char *)data);
	ast_pthread_mutex_lock(&parking_lock);
	pu = parkinglot;
	while(pu) {
		if (pu->parkingnum == park) {
			if (pl)
				pl->next = pu->next;
			else
				parkinglot = pu->next;
			break;
		}
		pu = pu->next;
	}
	ast_pthread_mutex_unlock(&parking_lock);
	if (pu) {
		peer = pu->chan;
		free(pu);
	}
	if (peer) {
		res = ast_channel_make_compatible(chan, peer);
		if (res < 0) {
			ast_log(LOG_WARNING, "Could not make channels %s and %s compatible for bridge\n", chan->name, peer->name);
			ast_hangup(peer);
			return -1;
		}
		/* This runs sorta backwards, since we give the incoming channel control, as if it
		   were the person called. */
		if (option_verbose > 2) 
			ast_verbose(VERBOSE_PREFIX_3 "Channel %s connected to parked call %d\n", chan->name, park);
		res = bridge_call(peer, chan, 1);
		/* Simulate the PBX hanging up */
		if (res != AST_PBX_KEEPALIVE)
			ast_hangup(peer);
		return -1;
	} else {
		/* XXX Play a message XXX */
		if (option_verbose > 2) 
			ast_verbose(VERBOSE_PREFIX_3 "Channel %s tried to talk to non-existant parked call %d\n", chan->name, park);
		res = -1;
	}
	LOCAL_USER_REMOVE(u);
	return res;
}

static int dial_exec(struct ast_channel *chan, void *data)
{
	int res=-1;
	struct localuser *u;
	char *info, *peers, *timeout, *tech, *number, *rest, *cur;
	struct localuser *outgoing=NULL, *tmp;
	struct ast_channel *peer;
	int to;
	int allowredir=0;
	char numsubst[AST_MAX_EXTENSION];
	char restofit[AST_MAX_EXTENSION];
	char *transfer = NULL;
	char *newnum;
	
	if (!data) {
		ast_log(LOG_WARNING, "Dial requires an argument (technology1/number1&technology2/number2...|optional timeout)\n");
		return -1;
	}
	
	LOCAL_USER_ADD(u);
	
	/* Parse our arguments XXX Check for failure XXX */
	info = malloc(strlen((char *)data) + AST_MAX_EXTENSION);
	if (!info) {
		ast_log(LOG_WARNING, "Out of memory\n");
		return -1;
	}
	strncpy(info, (char *)data, strlen((char *)data) + AST_MAX_EXTENSION);
	peers = info;
	if (peers) {
		timeout = strchr(info, '|');
		if (timeout) {
			*timeout = '\0';
			timeout++;
			transfer = strchr(timeout, '|');
			if (transfer) {
				*transfer = '\0';
				transfer++;
			}
		}
	} else
		timeout = NULL;
	if (!peers || !strlen(peers)) {
		ast_log(LOG_WARNING, "Dial argument takes format (technology1/number1&technology2/number2...|optional timeout)\n");
		goto out;
	}
	
	cur = peers;
	do {
		/* Remember where to start next time */
		rest = strchr(cur, '&');
		if (rest) {
			*rest = 0;
			rest++;
		}
		/* Get a technology/[device:]number pair */
		tech = cur;
		number = strchr(tech, '/');
		if (!number) {
			ast_log(LOG_WARNING, "Dial argument takes format (technology1/[device:]number1&technology2/[device:]number2...|optional timeout)\n");
			goto out;
		}
		*number = '\0';
		number++;
		tmp = malloc(sizeof(struct localuser));
		if (!tmp) {
			ast_log(LOG_WARNING, "Out of memory\n");
			goto out;
		}
		if (transfer && (strchr(transfer, 't')))
			tmp->allowredirect = 1;
		else
			tmp->allowredirect = 0;
		strncpy(numsubst, number, sizeof(numsubst));
		/* If we're dialing by extension, look at the extension to know what to dial */
		if ((newnum = strstr(numsubst, "BYEXTENSION"))) {
			strncpy(restofit, newnum + strlen("BYEXTENSION"), sizeof(restofit));
			snprintf(newnum, sizeof(numsubst) - (newnum - numsubst), "%s%s", chan->exten,restofit);
			if (option_debug)
				ast_log(LOG_DEBUG, "Dialing by extension %s\n", numsubst);
		}
		/* Request the peer */
		tmp->chan = ast_request(tech, chan->nativeformats, numsubst);
		if (!tmp->chan) {
			/* If we can't, just go on to the next call */
			ast_log(LOG_WARNING, "Unable to create channel of type '%s'\n", tech);
			free(tmp);
			cur = rest;
			continue;
		}
		tmp->chan->appl = "AppDial";
		tmp->chan->data = "(Outgoing Line)";
		if (tmp->chan->callerid)
			free(tmp->chan->callerid);
		if (chan->callerid)
			tmp->chan->callerid = strdup(chan->callerid);
		else
			tmp->chan->callerid = NULL;
		/* Place the call, but don't wait on the answer */
		res = ast_call(tmp->chan, numsubst, 0);
		if (res) {
			/* Again, keep going even if there's an error */
			if (option_debug)
				ast_log(LOG_DEBUG, "ast call on peer returned %d\n", res);
			else if (option_verbose > 2)
				ast_verbose(VERBOSE_PREFIX_3 "Couldn't call %s\n", numsubst);
			ast_hangup(tmp->chan);
			free(tmp);
			cur = rest;
			continue;
		} else
			if (option_verbose > 2)
				ast_verbose(VERBOSE_PREFIX_3 "Called %s\n", numsubst);
		/* Put them in the list of outgoing thingies...  We're ready now. 
		   XXX If we're forcibly removed, these outgoing calls won't get
		   hung up XXX */
		tmp->stillgoing = -1;
		tmp->next = outgoing;
		outgoing = tmp;
		cur = rest;
	} while(cur);
	
	if (timeout && strlen(timeout))
		to = atoi(timeout) * 1000;
	else
		to = -1;
	peer = wait_for_answer(chan, outgoing, &to, &allowredir);
	if (!peer) {
		if (to) 
			/* Musta gotten hung up */
			res = -1;
		 else 
		 	/* Nobody answered, next please? */
			res=0;
		
		goto out;
	}
	if (peer) {
		/* Ah ha!  Someone answered within the desired timeframe.  Of course after this
		   we will always return with -1 so that it is hung up properly after the 
		   conversation.  */
		hanguptree(outgoing, peer);
		outgoing = NULL;
		/* Make sure channels are compatible */
		res = ast_channel_make_compatible(chan, peer);
		if (res < 0) {
			ast_log(LOG_WARNING, "Had to drop call because I couldn't make %s compatible with %s\n", chan->name, peer->name);
			ast_hangup(peer);
			return -1;
		}
		if (!strcmp(chan->type,"Zap")) {
			int x = 2;
			ast_channel_setoption(chan,AST_OPTION_TONE_VERIFY,&x,sizeof(char),0);
		}			
		if (!strcmp(peer->type,"Zap")) {
			int x = 2;
			ast_channel_setoption(peer,AST_OPTION_TONE_VERIFY,&x,sizeof(char),0);
		}			
		res = bridge_call(chan, peer, allowredir);
		ast_hangup(peer);
	}	
out:
	hanguptree(outgoing, NULL);
	free(info);
	LOCAL_USER_REMOVE(u);
	return res;
}

int unload_module(void)
{
	STANDARD_HANGUP_LOCALUSERS;
	return ast_unregister_application(app);
}

int load_module(void)
{
	int res;
	int x;
	struct ast_context *con;
	char exten[AST_MAX_EXTENSION];
	con = ast_context_find(parking_con);
	if (!con) {
		con = ast_context_create(parking_con, registrar);
		if (!con) {
			ast_log(LOG_ERROR, "Parking context '%s' does not exist and unable to create\n", parking_con);
			return -1;
		}
	}
	for(x=parking_start; x<=parking_stop;x++) {
		snprintf(exten, sizeof(exten), "%d", x);
		ast_add_extension2(con, 1, exten, 1, NULL, parkedcall, strdup(exten), free, registrar);
	}
	pthread_create(&parking_thread, NULL, do_parking_thread, NULL);
	res = ast_register_application(parkedcall, park_exec, synopsis, descrip);
	if (!res)
		res = ast_register_application(app, dial_exec, synopsis, descrip);
	return res;
}

char *description(void)
{
	return tdesc;
}

int usecount(void)
{
	int res;
	STANDARD_USECOUNT(res);
	return res;
}

char *key()
{
	return ASTERISK_GPL_KEY;
}