Version 0.1.9 from FTP

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@364 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 4288 insertions, 0 deletions

diff --git a/channels/chan_zap.c b/channels/chan_zap.c
new file mode 100755
index 000000000..36c559dee
--- /dev/null
+++ b/channels/chan_zap.c
@@ -0,0 +1,4288 @@
+/*
+ * Asterisk -- A telephony toolkit for Linux.
+ *
+ * Tormenta T1 Card (via Zapata library) support 
+ * 
+ * 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 <stdio.h>
+#include <pthread.h>
+#include <string.h>
+#include <asterisk/channel.h>
+#include <asterisk/channel_pvt.h>
+#include <asterisk/config.h>
+#include <asterisk/logger.h>
+#include <asterisk/module.h>
+#include <asterisk/pbx.h>
+#include <asterisk/options.h>
+#include <asterisk/file.h>
+#include <asterisk/ulaw.h>
+#include <asterisk/callerid.h>
+#include <asterisk/cli.h>
+#include <sys/signal.h>
+#include <sys/select.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <linux/zaptel.h>
+#include <zap.h>
+#include <math.h>
+#include <tonezone.h>
+#ifdef ZAPATA_PRI
+#include <libpri.h>
+#endif
+
+/* 
+   XXX 
+   XXX   We definitely need to lock the private structure in zt_read and such 
+   XXX  
+ */
+
+#define RINGT 274
+
+#ifdef ZAPATA_PRI
+static char *desc = "Zapata Telephony (PRI) Driver";
+static char *tdesc = "Zapata Telephony + PRI Interface Driver";
+#else
+static char *desc = "Zapata Telphony Driver";
+static char *tdesc = "Zapata Telephony Interface Driver";
+#endif
+static char *type = "Zap";
+static char *typecompat = "Tor";	/* Retain compatibility with chan_tor */
+static char *config = "zapata.conf";
+
+#define SIG_EM		ZT_SIG_EM
+#define SIG_EMWINK 	(0x10000 | ZT_SIG_EM)
+#define SIG_FEATD	(0x20000 | ZT_SIG_EM)
+#define SIG_FXSLS	ZT_SIG_FXSLS
+#define SIG_FXSGS	ZT_SIG_FXSGS
+#define SIG_FXSKS	ZT_SIG_FXSKS
+#define SIG_FXOLS	ZT_SIG_FXOLS
+#define SIG_FXOGS	ZT_SIG_FXOGS
+#define SIG_FXOKS	ZT_SIG_FXOKS
+#define SIG_PRI		ZT_SIG_CLEAR
+
+#define NUM_SPANS 	2
+
+static char context[AST_MAX_EXTENSION] = "default";
+static char callerid[256] = "";
+
+static char language[MAX_LANGUAGE] = "";
+
+static int use_callerid = 1;
+
+static int cur_signalling = -1;
+
+static int cur_group = 0;
+static int cur_callergroup = 0;
+static int cur_pickupgroup = 0;
+
+static int immediate = 0;
+
+static int stripmsd = 0;
+
+static int callwaiting = 0;
+
+static int callwaitingcallerid = 0;
+
+static int hidecallerid = 0;
+
+static int threewaycalling = 0;
+
+static int transfer = 0;
+
+static float rxgain = 0.0;
+
+static float txgain = 0.0;
+
+static int echocancel;
+
+/* Wait up to 16 seconds for first digit (FXO logic) */
+static int firstdigittimeout = 16000;
+
+/* How long to wait for following digits (FXO logic) */
+static int gendigittimeout = 8000;
+
+static int usecnt =0;
+static pthread_mutex_t usecnt_lock = PTHREAD_MUTEX_INITIALIZER;
+
+/* Protect the interface list (of zt_pvt's) */
+static pthread_mutex_t iflock = PTHREAD_MUTEX_INITIALIZER;
+
+/* Protect the monitoring thread, so only one process can kill or start it, and not
+   when it's doing something critical. */
+static pthread_mutex_t monlock = PTHREAD_MUTEX_INITIALIZER;
+
+/* This is the thread for the monitor which checks for input on the channels
+   which are not currently in use.  */
+static pthread_t monitor_thread = 0;
+
+static int restart_monitor(void);
+
+static int zt_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags, struct ast_frame **fo, struct ast_channel **rc);
+
+static inline int zt_get_event(int fd)
+{
+	/* Avoid the silly zt_getevent which ignores a bunch of events */
+	int j;
+	if (ioctl(fd, ZT_GETEVENT, &j) == -1) return -1;
+	return j;
+}
+
+static inline int zt_wait_event(int fd)
+{
+	/* Avoid the silly zt_waitevent which ignores a bunch of events */
+	int i,j=0;
+	i = ZT_IOMUX_SIGEVENT;
+	if (ioctl(fd, ZT_IOMUX, &i) == -1) return -1;
+	if (ioctl(fd, ZT_GETEVENT, &j) == -1) return -1;
+	return j;
+}
+
+/* Chunk size to read -- we use the same size as the chunks that the zapata library uses.  */   
+#define READ_SIZE 204
+
+#define MASK_AVAIL		(1 << 0)		/* Channel available for PRI use */
+#define MASK_INUSE		(1 << 1)		/* Channel currently in use */
+
+#define CALLWAITING_SILENT_SAMPLES	( (300 * 8) / READ_SIZE) /* 300 ms */
+#define CALLWAITING_REPEAT_SAMPLES	( (10000 * 8) / READ_SIZE) /* 300 ms */
+
+struct zt_pvt;
+
+
+#ifdef ZAPATA_PRI
+struct zt_pri {
+	pthread_t master;			/* Thread of master */
+	pthread_mutex_t lock;		/* Mutex */
+	int nodetype;				/* Node type */
+	int switchtype;				/* Type of switch to emulate */
+	struct pri *pri;
+	int debug;
+	int fd;
+	int up;
+	int offset;
+	int span;
+	int chanmask[24];			/* Channel status */
+	struct zt_pvt *pvt[24];	/* Member channel pvt structs */
+	struct zt_channel *chan[24];	/* Channels on each line */
+};
+
+
+static struct zt_pri pris[NUM_SPANS];
+
+static int pritype = PRI_CPE;
+
+#if 0
+#define DEFAULT_PRI_DEBUG (PRI_DEBUG_Q931_DUMP | PRI_DEBUG_Q931_STATE)
+#else
+#define DEFAULT_PRI_DEBUG 0
+/*
+#define DEFAULT_PRI_DEBUG (PRI_DEBUG_Q931_DUMP | PRI_DEBUG_Q921_DUMP | PRI_DEBUG_Q921_RAW)
+*/
+#endif
+
+static inline int pri_grab(struct zt_pri *pri)
+{
+	int res;
+	/* Grab the lock first */
+    res = ast_pthread_mutex_lock(&pri->lock);
+	if (res)
+		return res;
+	/* Then break the select */
+	pthread_kill(pri->master, SIGURG);
+	return 0;
+}
+
+static inline void pri_rel(struct zt_pri *pri)
+{
+	ast_pthread_mutex_unlock(&pri->lock);
+}
+
+static int switchtype = PRI_SWITCH_NI2;
+
+#endif
+
+static struct zt_pvt {
+	ZAP *z;
+	pthread_mutex_t lock;
+	struct ast_channel *owner;	/* Our owner (if applicable) */
+	struct ast_channel *owners[3];	
+		/* Up to three channels can be associated with this call */
+		
+	int callwaitindex;			/* Call waiting index into owners */	
+	int thirdcallindex;			/* Three-way calling index into owners */
+	int normalindex;			/* "Normal" call index into owners */
+	
+	int sig;					/* Signalling style */
+	float rxgain;
+	float txgain;
+	struct zt_pvt *next;			/* Next channel in list */
+	char context[AST_MAX_EXTENSION];
+	char exten[AST_MAX_EXTENSION];
+	char language[MAX_LANGUAGE];
+	char callerid[AST_MAX_EXTENSION];
+	char callwaitcid[AST_MAX_EXTENSION];
+	char dtmfq[AST_MAX_EXTENSION];
+	struct ast_frame f_unused;	/* Usually unused, but could in rare cases be needed */
+	struct ast_frame f[3];		/* One frame for each channel.  How did this ever work before? */
+	short buffer[3][AST_FRIENDLY_OFFSET/2 + READ_SIZE];
+	int group;
+	int callgroup;
+	int pickupgroup;
+	int immediate;				/* Answer before getting digits? */
+	int channel;				/* Channel Number */
+	int span;					/* Span number */
+	int dialing;
+	int use_callerid;			/* Whether or not to use caller id on this channel */
+	int hidecallerid;
+	int permhidecallerid;		/* Whether to hide our outgoing caller ID or not */
+	int callwaitingrepeat;		/* How many samples to wait before repeating call waiting */
+	unsigned char *cidspill;
+	int cidpos;
+	int cidlen;
+	int ringt;
+	int stripmsd;
+	int needringing[3];
+	int needanswer[3];
+	int callwaiting;
+	int callwaitcas;
+	int callwaitrings;
+	int echocancel;
+	int permcallwaiting;
+	int callwaitingcallerid;
+	int threewaycalling;
+	int transfer;
+	int cref;					/* Call reference number */
+	ZT_DIAL_OPERATION dop;
+	struct zt_confinfo conf;	/* Saved state of conference */
+	struct zt_confinfo conf2;	/* Saved state of alternate conference */
+	int confno;					/* Conference number */
+	ZAP *pseudo;				/* Pseudo channel FD */
+	int pseudochan;				/* Pseudo channel */
+	int destroy;
+	int ignoredtmf;				
+	int inalarm;
+#ifdef ZAPATA_PRI
+	struct zt_pri *pri;
+	q931_call *call;
+#endif	
+} *iflist = NULL;
+
+#define INTHREEWAY(p) ((p->normalindex > -1) && (p->thirdcallindex > -1) && \
+		(p->owner == p->owners[p->normalindex]))
+
+#define ISTRUNK(p) ((p->sig == SIG_FXSLS) || (p->sig == SIG_FXSKS) || \
+			(p->sig == SIG_FXSGS))
+
+
+/* return non-zero if clear dtmf is appropriate */
+static int CLEARDTMF(struct ast_channel *chan) {
+struct zt_pvt *p = chan->pvt->pvt,*themp;
+struct ast_channel *them;
+	if (!p)
+		return 0;
+	  /* if not in a 3 way, we should be okay */
+	if (p->thirdcallindex == -1) return 1;
+	  /* get the other side of the call's channel pointer */
+	if (p->owners[p->normalindex] == chan)
+		them = p->owners[p->thirdcallindex];
+	else
+		them = p->owners[p->normalindex];
+	if (!them->bridge) return 1;
+	  /* get their private structure, too */
+	themp = them->pvt->pvt;
+	  /* if does not use zt bridge code, return 0 */
+	if (them->pvt->bridge != zt_bridge) return 0;
+	if (them->bridge->pvt->bridge != zt_bridge) return 0;
+	return 1; /* okay, I guess we are okay to be clear */
+}
+
+static int alloc_pseudo(struct zt_pvt *p)
+{
+	int x;
+	ZAP *z;
+	int res;
+	ZT_BUFFERINFO bi;
+	if (p->pseudo || p->pseudochan){
+		ast_log(LOG_WARNING, "Already have a pseudo fd: %d, chan: %d\n",
+			zap_fd(p->pseudo), p->pseudochan);
+		return -1;
+	}
+	z = zap_open("/dev/zap/pseudo", 1);
+	if (!z) {
+		ast_log(LOG_WARNING, "Unable to open /dev/zap/pseudo: %s\n", strerror(errno));
+		return -1;
+	} else {
+		res = ioctl(zap_fd(z), ZT_GET_BUFINFO, &bi);
+		if (!res) {
+			bi.txbufpolicy = ZT_POLICY_IMMEDIATE;
+			bi.rxbufpolicy = ZT_POLICY_IMMEDIATE;
+			bi.numbufs = 4;
+			res = ioctl(zap_fd(z), ZT_SET_BUFINFO, &bi);
+			if (res < 0) {
+				ast_log(LOG_WARNING, "Unable to set buffer policy on channel %d\n", x);
+			}
+		} else 
+			ast_log(LOG_WARNING, "Unable to check buffer policy on channel %d\n", x);
+		p->pseudo = z;
+		if (ioctl(zap_fd(z), ZT_CHANNO, &x) == 1) {
+			ast_log(LOG_WARNING,"Unable to get channel number for pseudo channel on FD %d\n",zap_fd(z));
+			return -1;
+		}
+		p->pseudochan = x;
+		if (option_debug)
+			ast_log(LOG_DEBUG, "Allocated pseudo channel %d on FD %d\n", p->pseudochan, zap_fd(p->pseudo));
+		return 0;
+	}
+	/* Never reached */
+	return 0;
+}
+
+static int unalloc_pseudo(struct zt_pvt *p)
+{
+	if (p->pseudo)
+		zap_close(p->pseudo);
+	if (option_debug)
+		ast_log(LOG_DEBUG, "Released pseudo channel %d\n", p->pseudochan);
+	p->pseudo = NULL;
+	p->pseudochan = 0;
+	return 0;
+}
+
+static int zt_digit(struct ast_channel *ast, char digit)
+{
+	ZT_DIAL_OPERATION zo;
+	struct zt_pvt *p;
+	int res;
+	zo.op = ZT_DIAL_OP_APPEND;
+	zo.dialstr[0] = 'T';
+	zo.dialstr[1] = digit;
+	zo.dialstr[2] = 0;
+	p = ast->pvt->pvt;
+	if ((res = ioctl(zap_fd(p->z), ZT_DIAL, &zo)))
+		ast_log(LOG_WARNING, "Couldn't dial digit %c\n", digit);
+	else
+		p->dialing = 1;
+	
+	return res;
+}
+
+static char *events[] = {
+        "No event",
+        "On hook",
+        "Ring/Answered",
+        "Wink/Flash",
+        "Alarm",
+        "No more alarm",
+		"HDLC Abort",
+		"HDLC Overrun",
+		"HDLC Bad FCS",
+		"Dial Complete",
+		"Ringer On",
+		"Ringer Off",
+		"Hook Transition Complete"
+};
+ 
+static char *event2str(int event)
+{
+        static char buf[256];
+        if ((event < 13) && (event > -1))
+                return events[event];
+        sprintf(buf, "Event %d", event);
+        return buf;
+}
+
+static char *sig2str(int sig)
+{
+	static char buf[256];
+	switch(sig) {
+	case SIG_EM:
+		return "E & M Immediate";
+	case SIG_EMWINK:
+		return "E & M Wink";
+	case SIG_FEATD:
+		return "Feature Group D";
+	case SIG_FXSLS:
+		return "FXS Loopstart";
+	case SIG_FXSGS:
+		return "FXS Groundstart";
+	case SIG_FXSKS:
+		return "FXS Kewlstart";
+	case SIG_FXOLS:
+		return "FXO Loopstart";
+	case SIG_FXOGS:
+		return "FXO Groundstart";
+	case SIG_FXOKS:
+		return "FXO Kewlstart";
+	case SIG_PRI:
+		return "PRI Signalling";
+	default:
+		snprintf(buf, sizeof(buf), "Unknown signalling %d\n", sig);
+		return buf;
+	}
+}
+
+static int conf_set(struct zt_pvt *p, int req, int force)
+{
+
+	/* Set channel to given conference, -1 to allocate one */
+	ZT_CONFINFO ci;
+	ZT_CONFINFO cip;
+	int res;
+	if ((p->confno > -1) && (p->confno != req) && (!force)) {
+		ast_log(LOG_WARNING, "Channel %d already has conference %d allocated\n", p->channel, p->confno);
+		return -1;
+	}
+	ci.chan = 0;
+	ci.confno = 0;
+	/* Check current conference stuff */
+	res = ioctl(zap_fd(p->z), ZT_GETCONF, &ci);
+	if (res < 0) {
+		ast_log(LOG_WARNING, "Failed to get conference info on channel %d: %s\n",
+			p->channel, strerror(errno));
+		return -1;
+	}
+	if (!force && ci.confmode && (ci.confno != p->confno)) {
+		ast_log(LOG_WARNING, "Channel %d is already in a conference (%d, %x) we didn't create (req = %d)\n", p->channel, ci.confno, ci.confmode, req);
+		return -1;
+	}
+	ci.chan = 0;
+	ci.confno = req;
+	ci.confmode = ZT_CONF_REALANDPSEUDO | ZT_CONF_TALKER | ZT_CONF_LISTENER | ZT_CONF_PSEUDO_LISTENER | ZT_CONF_PSEUDO_TALKER; 
+	res = ioctl(zap_fd(p->z), ZT_SETCONF, &ci);
+	if (res < 0) {
+		ast_log(LOG_WARNING, "Failed to set conference to %d on channel %d: %s\n",
+			req, p->channel, strerror(errno));
+		return -1;
+	}
+	if (INTHREEWAY(p)) {
+			/* We have a three way call active, be sure the third participant is included in
+			   our conference. */
+		cip.chan = 0;
+		cip.confno = ci.confno;
+		cip.confmode = ZT_CONF_CONF | ZT_CONF_TALKER | ZT_CONF_LISTENER;
+		
+		res = ioctl(zap_fd(p->pseudo), ZT_SETCONF, &cip);
+		if (res < 0) {
+			ast_log(LOG_WARNING, "Failed to set conference info on pseudo channel %d: %s\n",
+				p->pseudochan, strerror(errno));
+			return -1;
+		}
+		ast_log(LOG_DEBUG, "Conferenced in third way call\n");
+	} else {
+		if (p->pseudo || (p->pseudochan)) {
+			ast_log(LOG_DEBUG, "There's a pseudo something on %d (channel %d), but we're not conferencing it in at the moment?\n",
+				zap_fd(p->pseudo), p->pseudochan);
+			cip.chan = 0;
+			cip.confno = ci.confno;
+			cip.confmode = ZT_CONF_NORMAL;
+			res = ioctl(zap_fd(p->pseudo), ZT_SETCONF, &cip);
+			if (res < 0) {
+				ast_log(LOG_WARNING, "Failed to set conference info on pseudo channel %d: %s\n",
+					p->pseudochan, strerror(errno));
+				return -1;
+			}
+		}
+	}
+	p->confno = ci.confno;
+	return 0;
+}
+
+static int three_way(struct zt_pvt *p)
+{
+	ast_log(LOG_DEBUG, "Setting up three way call\n");
+	return conf_set(p, p->confno, 0);
+}
+
+static int conf_clear(struct zt_pvt *p)
+{
+	ZT_CONFINFO ci;
+	int res;
+	ci.confmode = ZT_CONF_NORMAL;
+	ci.chan = 0;
+	ci.confno = 0;
+	res = ioctl(zap_fd(p->z), ZT_SETCONF, &ci);
+	if (res < 0) {
+		ast_log(LOG_WARNING, "Failed to clear conference info on channel %d: %s\n",
+			p->channel, strerror(errno));
+		return -1;
+	}
+	p->confno = -1;
+	return 0;
+}
+
+static void zt_enable_ec(struct zt_pvt *p)
+{
+	int x;
+	int res;
+	if (p->echocancel) {
+		x = 1;
+		res = ioctl(zap_fd(p->z), ZT_ECHOCANCEL, &x);
+		if (res) 
+			ast_log(LOG_WARNING, "Unable to enable echo cancellation on channel %d\n", p->channel);
+		else
+			ast_log(LOG_DEBUG, "Enabled echo cancellation on channel %d\n", p->channel);
+	}
+}
+
+static void zt_disable_ec(struct zt_pvt *p)
+{
+	int x;
+	int res;
+	if (p->echocancel) {
+		x = 0;
+		res = ioctl(zap_fd(p->z), ZT_ECHOCANCEL, &x);
+		if (res) 
+			ast_log(LOG_WARNING, "Unable to disable echo cancellation on channel %d\n", p->channel);
+		else
+			ast_log(LOG_DEBUG, "disabled echo cancellation on channel %d\n", p->channel);
+	}
+}
+
+static int zt_get_index(struct ast_channel *ast, struct zt_pvt *p, int nullok)
+{
+	int res;
+	if (p->owners[0] == ast)
+		res = 0;
+	else if (p->owners[1] == ast)
+		res = 1;
+	else if (p->owners[2] == ast)
+		res = 2;
+	else {
+		res = -1;
+		if (!nullok)
+			ast_log(LOG_WARNING, "Unable to get index, and nullok is not asserted\n");
+	}
+	return res;
+}
+
+static int set_actual_gain(int fd, int chan, float rxgain, float txgain)
+{
+	struct	zt_gains g;
+	float ltxgain;
+	float lrxgain;
+	int j,k;
+	g.chan = chan;
+	  /* caluculate linear value of tx gain */
+	ltxgain = pow(10.0,txgain / 20.0);
+	  /* caluculate linear value of rx gain */
+	lrxgain = pow(10.0,rxgain / 20.0);
+	for (j=0;j<256;j++) {
+		k = (int)(((float)ast_mulaw[j]) * lrxgain);
+		if (k > 32767) k = 32767;
+		if (k < -32767) k = -32767;
+		g.rxgain[j] = ast_lin2mu[k + 32768];
+		k = (int)(((float)ast_mulaw[j]) * ltxgain);
+		if (k > 32767) k = 32767;
+		if (k < -32767) k = -32767;
+		g.txgain[j] = ast_lin2mu[k + 32768];
+	}
+		
+	  /* set 'em */
+	return(ioctl(fd,ZT_SETGAINS,&g));
+}
+
+static inline int zt_set_hook(int fd, int hs)
+{
+	int x, res;
+	x = hs;
+	res = ioctl(fd, ZT_HOOK, &x);
+	if (res < 0) 
+		ast_log(LOG_WARNING, "zt hook failed: %s\n", strerror(errno));
+	return res;
+}
+
+static int save_conference(struct zt_pvt *p)
+{
+	struct zt_confinfo c;
+	int res;
+	if (p->conf.confmode) {
+		ast_log(LOG_WARNING, "Can't save conference -- already in use\n");
+		return -1;
+	}
+	p->conf.chan = 0;
+	res = ioctl(zap_fd(p->z), ZT_GETCONF, &p->conf);
+	if (res) {
+		ast_log(LOG_WARNING, "Unable to get conference info: %s\n", strerror(errno));
+		p->conf.confmode = 0;
+		return -1;
+	}
+	c.chan = 0;
+	c.confno = 0;
+	c.confmode = ZT_CONF_NORMAL;
+	res = ioctl(zap_fd(p->z), ZT_SETCONF, &c);
+	if (res) {
+		ast_log(LOG_WARNING, "Unable to set conference info: %s\n", strerror(errno));
+		return -1;
+	}
+	switch(p->conf.confmode) {
+	case ZT_CONF_NORMAL:
+		p->conf2.confmode = 0;
+		break;
+	case ZT_CONF_MONITOR:
+		/* Get the other size */
+		p->conf2.chan = p->conf.confno;
+		res = ioctl(zap_fd(p->z), ZT_GETCONF, &p->conf2);
+		if (res) {
+			ast_log(LOG_WARNING, "Unable to get secondaryconference info: %s\n", strerror(errno));
+			p->conf2.confmode = 0;
+			return -1;
+		}
+		c.chan = p->conf.confno;
+		c.confno = 0;
+		c.confmode = ZT_CONF_NORMAL;
+		res = ioctl(zap_fd(p->z), ZT_SETCONF, &c);
+		if (res) {
+			ast_log(LOG_WARNING, "Unable to set secondaryconference info: %s\n", strerror(errno));
+			p->conf2.confmode = 0;
+			return -1;
+		}
+		break;
+	case ZT_CONF_CONF | ZT_CONF_LISTENER | ZT_CONF_TALKER:
+		p->conf2.confmode = 0;
+		break;
+	default:
+		ast_log(LOG_WARNING, "Don't know how to save conference state for conf mode %d\n", p->conf.confmode);
+		return -1;
+	}
+	if (option_debug)
+		ast_log(LOG_DEBUG, "Disabled conferencing\n");
+	return 0;
+}
+
+static int restore_conference(struct zt_pvt *p)
+{
+	int res;
+	if (p->conf.confmode) {
+		res = ioctl(zap_fd(p->z), ZT_SETCONF, &p->conf);
+		p->conf.confmode = 0;
+		if (res) {
+			ast_log(LOG_WARNING, "Unable to restore conference info: %s\n", strerror(errno));
+			return -1;
+		}
+		if (p->conf2.confmode) {
+			res = ioctl(zap_fd(p->z), ZT_SETCONF, &p->conf2);
+			p->conf2.confmode = 0;
+			if (res) {
+				ast_log(LOG_WARNING, "Unable to restore conference info: %s\n", strerror(errno));
+				return -1;
+			}
+		}
+	}
+	if (option_debug)
+		ast_log(LOG_DEBUG, "Restored conferencing\n");
+	return 0;
+}
+
+static int send_callerid(struct zt_pvt *p);
+
+int send_cwcidspill(struct zt_pvt *p)
+{
+	p->callwaitcas = 0;
+	p->cidspill = malloc(MAX_CALLERID_SIZE);
+	if (p->cidspill) {
+		memset(p->cidspill, 0x7f, MAX_CALLERID_SIZE);
+		p->cidlen = ast_callerid_callwaiting_generate(p->cidspill, p->callwaitcid);
+		/* Make sure we account for the end */
+		p->cidlen += READ_SIZE * 4;
+		p->cidpos = 0;
+		send_callerid(p);
+		if (option_verbose > 2)
+			ast_verbose(VERBOSE_PREFIX_3 "CPE supports Call Waiting Caller*ID.  Sending '%s'\n", p->callwaitcid);
+	} else return -1;
+	return 0;
+}
+
+static int send_callerid(struct zt_pvt *p)
+{
+	/* Assumes spill in p->cidspill, p->cidlen in length and we're p->cidpos into it */
+	int res;
+	while(p->cidpos < p->cidlen) {
+		res = write(zap_fd(p->z), p->cidspill + p->cidpos, p->cidlen - p->cidpos);
+		if (res < 0) {
+			if (errno == EAGAIN)
+				return 0;
+			else {
+				ast_log(LOG_WARNING, "write failed: %s\n", strerror(errno));
+				return -1;
+			}
+		}
+		if (!res)
+			return 0;
+		p->cidpos += res;
+	}
+	free(p->cidspill);
+	p->cidspill = 0;
+	if (p->callwaitcas) {
+		zap_clrdtmfn(p->z);
+		/* Check for a the ack on the CAS */
+		res = zap_getdtmf(p->z, 1, NULL, 0, 250, 250, ZAP_HOOKEXIT | ZAP_TIMEOUTOK);
+		if (res > 0) {
+			char tmp[2];
+			strncpy(tmp, zap_dtmfbuf(p->z), sizeof(tmp));
+			zap_clrdtmfn(p->z);
+			if ((tmp[0] == 'A') || (tmp[0] == 'D')) {
+				send_cwcidspill(p);
+			}
+		} else {
+			if (option_verbose > 2)
+				ast_verbose(VERBOSE_PREFIX_3 "CPE does not support Call Waiting Caller*ID.\n");
+			restore_conference(p);
+		}
+	} else
+		restore_conference(p);
+	return 0;
+}
+
+static int zt_callwait(struct ast_channel *ast)
+{
+	struct zt_pvt *p = ast->pvt->pvt;
+	p->callwaitingrepeat = CALLWAITING_REPEAT_SAMPLES;
+	if (p->cidspill) {
+		ast_log(LOG_WARNING, "Spill already exists?!?\n");
+		free(p->cidspill);
+	}
+	p->cidspill = malloc(2400 /* SAS */ + 680 /* CAS */ + READ_SIZE * 4);
+	if (p->cidspill) {
+		save_conference(p);
+		/* Silence */
+		memset(p->cidspill, 0x7f, 2400 + 600 + READ_SIZE * 4);
+		if (!p->callwaitrings && p->callwaitingcallerid) {
+			ast_callerid_gen_cas(p->cidspill, 2400 + 680);
+			p->callwaitcas = 1;
+			p->cidlen = 2400 + 680 + READ_SIZE * 4;
+		} else {
+			ast_callerid_gen_cas(p->cidspill, 2400);
+			p->callwaitcas = 0;
+			p->cidlen = 2400 + READ_SIZE * 4;
+		}
+		p->cidpos = 0;
+		send_callerid(p);
+	} else {
+		ast_log(LOG_WARNING, "Unable to create SAS/CAS spill\n");
+		return -1;
+	}
+	return 0;
+}
+
+static int zt_call(struct ast_channel *ast, char *dest, int timeout)
+{
+	struct zt_pvt *p = ast->pvt->pvt;
+	int x, res, index;
+	char *c, *n, *l;
+	char callerid[256];
+	if ((ast->state != AST_STATE_DOWN) && (ast->state != AST_STATE_RESERVED)) {
+		ast_log(LOG_WARNING, "zt_call called on %s, neither down nor reserved\n", ast->name);
+		return -1;
+	}
+	switch(p->sig) {
+	case SIG_FXOLS:
+	case SIG_FXOGS:
+	case SIG_FXOKS:
+		if (p->owner == ast) {
+			/* Normal ring, on hook */
+			if (p->use_callerid) {
+				/* Generate the Caller-ID spill if desired */
+				if (p->cidspill) {
+					ast_log(LOG_WARNING, "cidspill already exists??\n");
+					free(p->cidspill);
+				}
+				p->cidspill = malloc(MAX_CALLERID_SIZE);
+				p->callwaitcas = 0;
+				if (p->cidspill) {
+					p->cidlen = ast_callerid_generate(p->cidspill, ast->callerid);
+					p->cidpos = 0;
+					send_callerid(p);
+				} else
+					ast_log(LOG_WARNING, "Unable to generate CallerID spill\n");
+			}
+			x = ZT_RING;
+			if (ioctl(zap_fd(p->z), ZT_HOOK, &x) && (errno != EINPROGRESS)) {
+				ast_log(LOG_WARNING, "Unable to ring phone: %s\n", strerror(errno));
+				return -1;
+			}
+			p->dialing = 1;
+		} else {
+			/* Call waiting call */
+			p->callwaitrings = 0;
+			if (ast->callerid)
+				strncpy(p->callwaitcid, ast->callerid, sizeof(p->callwaitcid));
+			else
+				strcpy(p->callwaitcid, "");
+			/* Call waiting tone instead */
+			if (zt_callwait(ast))
+				return -1;
+				
+		}
+		ast->state = AST_STATE_RINGING;
+		index = zt_get_index(ast, p, 0);
+		if (index > -1) {
+			p->needringing[index] = 1;
+		}
+		break;
+	case SIG_FXSLS:
+	case SIG_FXSGS:
+	case SIG_FXSKS:
+	case SIG_EMWINK:
+	case SIG_EM:
+	case SIG_FEATD:
+		c = strchr(dest, '/');
+		if (c)
+			c++;
+		else
+			c = dest;
+		if (strlen(c) < p->stripmsd) {
+			ast_log(LOG_WARNING, "Number '%s' is shorter than stripmsd (%d)\n", c, p->stripmsd);
+			return -1;
+		}
+		x = ZT_START;
+		/* Start the trunk */
+		res = ioctl(zap_fd(p->z), ZT_HOOK, &x);
+		if (res < 0) {
+			if (errno != EINPROGRESS) {
+				ast_log(LOG_WARNING, "Unable to start channel: %s\n", strerror(errno));
+				return -1;
+			}
+		}
+		ast_log(LOG_DEBUG, "Dialing '%s'\n", c);
+		p->dop.op = ZT_DIAL_OP_REPLACE;
+		if (p->sig == SIG_FEATD) {
+			if (ast->callerid) {
+				strncpy(callerid, ast->callerid, sizeof(callerid));
+				ast_callerid_parse(callerid, &n, &l);
+				if (l) {
+					ast_shrink_phone_number(l);
+					if (!ast_isphonenumber(l))
+						l = NULL;
+				}
+			} else
+				l = NULL;
+			if (l) 
+				snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "T*%s*%s*", l, c + p->stripmsd);
+			else
+				snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "T**%s*", c + p->stripmsd);
+		} else 
+			snprintf(p->dop.dialstr, sizeof(p->dop.dialstr), "T%s", c + p->stripmsd);
+		if (!res) {
+			if (ioctl(zap_fd(p->z), ZT_DIAL, &p->dop)) {
+				x = ZT_ONHOOK;
+				ioctl(zap_fd(p->z), ZT_HOOK, &x);
+				ast_log(LOG_WARNING, "Dialing failed on channel %d: %s\n", p->channel, strerror(errno));
+				return -1;
+			}
+		} else
+			ast_log(LOG_DEBUG, "Deferring dialing...\n");
+		p->dialing = 1;
+		ast->state = AST_STATE_DIALING;
+		break;
+#ifdef ZAPATA_PRI
+	case SIG_PRI:
+		c = strchr(dest, '/');
+		if (c)
+			c++;
+		else
+			c = dest;
+		if (ast->callerid) {
+			strncpy(callerid, ast->callerid, sizeof(callerid));
+			ast_callerid_parse(callerid, &n, &l);
+			if (l) {
+				ast_shrink_phone_number(l);
+				if (!ast_isphonenumber(l))
+					l = NULL;
+			}
+		} else
+			l = NULL;
+		if (strlen(c) < p->stripmsd) {
+			ast_log(LOG_WARNING, "Number '%s' is shorter than stripmsd (%d)\n", c, p->stripmsd);
+			return -1;
+		}
+		if (pri_call(p->pri->pri, p->call, PRI_TRANS_CAP_SPEECH, 
+			((p->channel - 1) % 24) + 1, p->pri->nodetype == PRI_NETWORK ? 0 : 1, 1, l, PRI_NATIONAL_ISDN, 
+			l ? PRES_ALLOWED_USER_NUMBER_PASSED_SCREEN : PRES_NUMBER_NOT_AVAILABLE,
+			c + p->stripmsd, PRI_NATIONAL_ISDN)) {
+			ast_log(LOG_WARNING, "Unable to setup call to %s\n", c + p->stripmsd);
+			return -1;
+		}
+		break;
+#endif				
+	default:
+		ast_log(LOG_DEBUG, "not yet implemented\n");
+		return -1;
+	}
+	return 0;
+}
+
+static int destroy_channel(struct zt_pvt *prev, struct zt_pvt *cur, int now)
+{
+	int owned = 0;
+	int i = 0;
+	int res = 0;
+
+	if (!now) {
+		if (cur->owner) {
+			owned = 1;
+		}
+
+		for (i = 0; i < 3; i++) {
+			if (cur->owners[i]) {
+				owned = 1;
+			}
+		}
+		if (!owned) {
+			if (prev) {
+				prev->next = cur->next;
+			} else {
+				iflist = cur->next;
+			}
+			res = zap_close(cur->z);
+			if (res) {
+				ast_log(LOG_ERROR, "Unable to close device on channel %d\n", cur->channel);
+				free(cur);
+				return -1;
+			}
+			free(cur);
+		}
+	} else {
+		if (prev) {
+			prev->next = cur->next;
+		} else {
+			iflist = cur->next;
+		}
+		res = zap_close(cur->z);
+		if (res) {
+			ast_log(LOG_ERROR, "Unable to close device on channel %d\n", cur->channel);
+			free(cur);
+			return -1;
+		}
+		free(cur);
+	}
+	return 0;
+}
+
+
+static int zt_hangup(struct ast_channel *ast)
+{
+	int res;
+	int index,x;
+	static int restore_gains(struct zt_pvt *p);
+	struct zt_pvt *p = ast->pvt->pvt;
+	struct zt_pvt *tmp = NULL;
+	struct zt_pvt *prev = NULL;
+	ZT_PARAMS par;
+
+
+	if (option_debug)
+		ast_log(LOG_DEBUG, "zt_hangup(%s)\n", ast->name);
+	if (!ast->pvt->pvt) {
+		ast_log(LOG_WARNING, "Asked to hangup channel not connected\n");
+		return 0;
+	}
+	index = zt_get_index(ast, p, 1);
+
+	restore_gains(p);
+	zap_digitmode(p->z,0);
+	ast->state = AST_STATE_DOWN;
+	ast_log(LOG_DEBUG, "Hangup: index = %d, normal = %d, callwait = %d, thirdcall = %d\n",
+		index, p->normalindex, p->callwaitindex, p->thirdcallindex);
+	p->ignoredtmf = 0;
+	
+	if (index > -1) {
+		/* Real channel, do some fixup */
+		p->owners[index] = NULL;
+		p->needanswer[index] = 0;
+		p->needringing[index] = 0;
+		if (index == p->normalindex) {
+			p->normalindex = -1;
+			if ((p->callwaitindex > -1) && (p->thirdcallindex > -1)) 
+				ast_log(LOG_WARNING, "Normal call hung up with both three way call and a call waiting call in place?\n");
+			if (p->callwaitindex > -1) {
+				/* If we hung up the normal call, make the call wait call
+				   be the normal call if there was one */
+				p->normalindex = p->callwaitindex;
+				p->callwaitindex = -1;
+			} else if (p->thirdcallindex > -1) {
+				/* This was part of a three way call */
+				p->normalindex = p->thirdcallindex;
+				p->owners[p->normalindex]->fds[0] = zap_fd(p->z);
+				p->owner = p->owners[p->normalindex];
+				p->thirdcallindex = -1;
+				unalloc_pseudo(p);
+			}
+		} else if (index == p->callwaitindex) {
+			/* If this was a call waiting call, mark the call wait
+			   index as -1, so we know iavailable again */
+			p->callwaitindex = -1;
+		} else if (index == p->thirdcallindex) {
+			/* If this was part of a three way call index, let us make
+			   another three way call */
+			p->thirdcallindex = -1;
+			unalloc_pseudo(p);
+		} else {
+			/* This wasn't any sort of call, but how are we an index? */
+			ast_log(LOG_WARNING, "Index found but not any type of call?\n");
+		}
+	}
+
+	if (!p->owners[0] && !p->owners[1] && !p->owners[2]) {
+		p->owner = NULL;
+		p->ringt = 0;
+		/* Perform low level hangup if no owner left */
+#ifdef ZAPATA_PRI
+		if (p->sig == SIG_PRI) {
+			if (p->call) {
+				if (!pri_grab(p->pri)) {
+					res = pri_disconnect(p->pri->pri, p->call, PRI_CAUSE_NORMAL_CLEARING);
+					p->call = NULL;
+					if (res < 0) 
+						ast_log(LOG_WARNING, "pri_disconnect failed\n");
+					pri_rel(p->pri);			
+				} else {
+					ast_log(LOG_WARNING, "Unable to grab PRI on span %d\n", p->span);
+					res = -1;
+				}
+			} else
+				res = 0;
+		} else
+#endif
+			res = zt_set_hook(zap_fd(p->z), ZT_ONHOOK);
+		if (res < 0) {
+			ast_log(LOG_WARNING, "Unable to hangup line %s\n", ast->name);
+			return -1;
+		}
+		switch(p->sig) {
+		case SIG_FXOGS:
+		case SIG_FXOLS:
+		case SIG_FXOKS:
+			res = ioctl(zap_fd(p->z), ZT_GET_PARAMS, &par);
+			if (!res) {
+#if 0
+				ast_log(LOG_DEBUG, "Hanging up channel %d, offhook = %d\n", p->channel, par.rxisoffhook);
+#endif
+				/* If they're off hook, try playing congestion */
+				if (par.rxisoffhook)
+					tone_zone_play_tone(zap_fd(p->z), ZT_TONE_CONGESTION);
+				else
+					tone_zone_play_tone(zap_fd(p->z), -1);
+			}
+			break;
+		default:
+			tone_zone_play_tone(zap_fd(p->z), -1);
+		}
+		if (index > -1) {
+			p->needringing[index] = 0;
+			p->needanswer[index] = 0;
+		}
+		if (p->cidspill)
+			free(p->cidspill);
+		zt_disable_ec(p);
+		x = 0;
+		ast_channel_setoption(ast,AST_OPTION_TONE_VERIFY,&x,sizeof(char),0);
+		p->cidspill = NULL;
+		p->callwaitcas = 0;
+		p->callwaiting = p->permcallwaiting;
+		p->hidecallerid = p->permhidecallerid;
+		p->dialing = 0;
+		conf_clear(p);
+		unalloc_pseudo(p);
+		restart_monitor();
+	}
+	p->callwaitingrepeat = 0;
+	ast->pvt->pvt = NULL;
+	ast->state = AST_STATE_DOWN;
+	ast_pthread_mutex_lock(&usecnt_lock);
+	usecnt--;
+	if (usecnt < 0) 
+		ast_log(LOG_WARNING, "Usecnt < 0???\n");
+	ast_pthread_mutex_unlock(&usecnt_lock);
+	ast_update_use_count();
+	if (option_verbose > 2) 
+		ast_verbose( VERBOSE_PREFIX_3 "Hungup '%s'\n", ast->name);
+
+	tmp = iflist;
+	prev = NULL;
+	if (p->destroy) {
+		while (tmp) {
+			if (tmp->channel == p->channel) {
+				destroy_channel(prev, tmp, 0);
+				break;
+			} else {
+				prev = tmp;
+				tmp = tmp->next;
+			}
+		}
+	}
+
+	return 0;
+}
+
+static int zt_answer(struct ast_channel *ast)
+{
+	struct zt_pvt *p = ast->pvt->pvt;
+	int res=0;
+	ast->state = AST_STATE_UP;
+	switch(p->sig) {
+	case SIG_FXSLS:
+	case SIG_FXSGS:
+	case SIG_FXSKS:
+		p->ringt = 0;
+		/* Fall through */
+	case SIG_EM:
+	case SIG_EMWINK:
+	case SIG_FEATD:
+	case SIG_FXOLS:
+	case SIG_FXOGS:
+	case SIG_FXOKS:
+		/* Pick up the line */
+		ast_log(LOG_DEBUG, "Took %s off hook\n", ast->name);
+		res =  zt_set_hook(zap_fd(p->z), ZT_OFFHOOK);
+		tone_zone_play_tone(zap_fd(p->z), -1);
+		if (INTHREEWAY(p))
+			tone_zone_play_tone(zap_fd(p->pseudo), -1);
+		p->dialing = 0;
+		break;
+#ifdef ZAPATA_PRI
+	case SIG_PRI:
+		/* Send a pri acknowledge */
+		if (!pri_grab(p->pri)) {
+			res = pri_answer(p->pri->pri, p->call, 0, 1);
+			pri_rel(p->pri);
+		} else {
+			ast_log(LOG_WARNING, "Unable to grab PRI on span %d\n", p->span);
+			res= -1;
+		}
+		break;
+#endif		
+	default:
+		ast_log(LOG_WARNING, "Don't know how to answer signalling %d (channel %d)\n", p->sig, p->channel);
+		return -1;
+	}
+	return res;
+}
+
+static inline int bridge_cleanup(struct zt_pvt *p0, struct zt_pvt *p1)
+{
+	int res;
+	res = conf_clear(p0);
+	res |= conf_clear(p1);
+	return res;
+}
+
+static int zt_setoption(struct ast_channel *chan, int option, void *data, int datalen)
+{
+char	*cp;
+
+	struct zt_pvt *p = chan->pvt->pvt;
+
+	if (option != AST_OPTION_TONE_VERIFY) 
+	   {
+		errno = ENOSYS;
+		return -1;
+	   }
+	cp = (char *)data;
+	if ((!cp) || (datalen < 1))
+	   {
+		errno = EINVAL;
+		return -1;
+	   }
+	switch(*cp) {
+	    case 1:
+		ast_log(LOG_DEBUG, "Set option TONE VERIFY, mode: MUTECONF(1) on %s\n",chan->name);
+		zap_digitmode(p->z,ZAP_MUTECONF);  /* set mute mode if desired */
+		break;
+	    case 2:
+		ast_log(LOG_DEBUG, "Set option TONE VERIFY, mode: MUTECONF/MAX(2) on %s\n",chan->name);
+		zap_digitmode(p->z,ZAP_MUTECONF | ZAP_MUTEMAX);  /* set mute mode if desired */
+		break;
+	    default:
+		ast_log(LOG_DEBUG, "Set option TONE VERIFY, mode: OFF(0) on %s\n",chan->name);
+		zap_digitmode(p->z,0);  /* set mute mode if desired */
+		break;
+	}
+	errno = 0;
+	return 0;
+}
+
+static int zt_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags, struct ast_frame **fo, struct ast_channel **rc)
+{
+	/* Do a quickie conference between the two channels and wait for something to happen */
+	struct zt_pvt *p0 = c0->pvt->pvt;
+	struct zt_pvt *p1 = c1->pvt->pvt;
+	struct ast_channel *who = NULL, *cs[3];
+	struct ast_frame *f;
+	int to = -1;
+	
+	int confno = -1;
+	
+	  /* if need DTMF, cant native bridge */
+	if (flags & (AST_BRIDGE_DTMF_CHANNEL_0 | AST_BRIDGE_DTMF_CHANNEL_1))
+		return -2;
+	  /* if cant run clear DTMF, cant native bridge */
+	pthread_mutex_lock(&c0->lock);
+	pthread_mutex_lock(&c1->lock);
+	if (!CLEARDTMF(c0) || !CLEARDTMF(c1)) {
+		pthread_mutex_unlock(&c1->lock);
+		pthread_mutex_unlock(&c0->lock);
+		return -3;
+	}
+	p0 = c0->pvt->pvt;
+	p1 = c1->pvt->pvt;
+	if (c0->type == type)
+		/* Stop any playing tones */
+		tone_zone_play_tone(zap_fd(p0->z), 	-1);
+	if (c1->type == type)
+		tone_zone_play_tone(zap_fd(p1->z), 	-1);
+	pthread_mutex_unlock(&c1->lock);
+	pthread_mutex_unlock(&c0->lock);
+
+	cs[0] = c0;
+	cs[1] = c1;
+	for (;;) {
+		pthread_mutex_lock(&c0->lock);
+		pthread_mutex_lock(&c1->lock);
+		p0 = c0->pvt->pvt;
+		p1 = c1->pvt->pvt;
+
+		/* Stop if we're a zombie or need a soft hangup */
+		if (c0->zombie || c0->softhangup || c1->zombie || c1->softhangup) {
+			*fo = NULL;
+			if (who) *rc = who;
+			bridge_cleanup(p0, p1);
+			pthread_mutex_unlock(&c0->lock);
+			pthread_mutex_unlock(&c1->lock);
+			return 0;
+		}
+		if (!p0 || !p1 || (c0->type != type) || (c1->type != type)) {
+			pthread_mutex_unlock(&c0->lock);
+			pthread_mutex_unlock(&c1->lock);
+			return -2;
+		}
+
+		if (INTHREEWAY(p0) && (c0 == p0->owners[p0->thirdcallindex]))
+			tone_zone_play_tone(zap_fd(p0->pseudo), -1);
+		if (INTHREEWAY(p1) && (c1 == p1->owners[p1->thirdcallindex]))
+			tone_zone_play_tone(zap_fd(p1->pseudo), -1);
+		if (INTHREEWAY(p0) && (INTHREEWAY(p1))) {
+			ast_log(LOG_WARNING, "Too weird, can't bridge multiple three way calls\n");
+			pthread_mutex_unlock(&c0->lock);
+			pthread_mutex_unlock(&c1->lock);
+			return -1;
+		}
+		if ((p0->owner == c0) && (p1->owner == c1)) {
+			/* Okay, this call should actually be connected */
+			if ((p0->confno > -1) && (p1->confno > -1) && (p0->confno != p1->confno)) {
+				/* We have a conflict here.  Try to resolve it. */
+				if ((INTHREEWAY(p0) && (c0 == p0->owners[p0->normalindex]))) {
+					ast_log(LOG_DEBUG, "Channel %s is in a three way call with us, moving to our conference %d\n",
+						c1->name, p0->confno);
+					conf_set(p1, p0->confno, 1);
+				} else if (INTHREEWAY(p1) && (c1 == p1->owners[p1->normalindex])) {
+						ast_log(LOG_DEBUG, "Channel %s is in a three way call with us, moving to our conference %d\n",
+							c0->name, p1->confno);
+						conf_set(p0, p1->confno, 1);
+				} else {
+					ast_log(LOG_WARNING, "Can't bridge since %s is on conf %d and %s is on conf %d\n",
+						c0->name, p0->confno, c1->name, p1->confno);
+					pthread_mutex_unlock(&c0->lock);
+					pthread_mutex_unlock(&c1->lock);
+					return -1;
+				}
+			}
+			if (p0->confno > -1)
+				confno = p0->confno;
+			else
+				confno = p1->confno;
+			if (confno < 0) {
+				conf_set(p0, -1, 0);
+				confno = p0->confno;
+				ast_log(LOG_DEBUG, "Creating new conference %d for %s\n", confno, c0->name);
+			}
+			if (p0->confno != confno) {
+				ast_log(LOG_DEBUG, "Placing %s in conference %d\n", c0->name, confno);
+				conf_set(p0, confno, 0);
+			}
+			if (p1->confno != confno) {
+				ast_log(LOG_DEBUG, "Placing %s in conference %d\n", c1->name, confno);
+				conf_set(p1, confno, 0);
+			}
+		} else if (INTHREEWAY(p0) && (c0 == p0->owners[p0->thirdcallindex])) {
+			/* p0 is in a three way call and we're the third leg.  Join their
+			   conference, already in progress if there is one */
+			if ((p0->confno > -1) && (p1->confno != p0->confno)) {
+				confno = p0->confno;
+				ast_log(LOG_DEBUG, "Placing %s in conference %d\n", c1->name, confno);
+				conf_set(p1, confno, 0);
+			}
+		} else if (INTHREEWAY(p1) && (c1 == p1->owners[p1->thirdcallindex])) {
+			/* p0 is in a three way call and we're the third leg.  Join their
+			   conference, already in progress if there is one */
+			if ((p1->confno > -1) && (p1->confno != p0->confno)) {
+				confno = p0->confno;
+				ast_log(LOG_DEBUG, "Placing %s in conference %d\n", c0->name, confno);
+				conf_set(p0, confno, 0);
+			}
+		}
+		pthread_mutex_unlock(&c0->lock);
+		pthread_mutex_unlock(&c1->lock);
+		
+		who = ast_waitfor_n(cs, 2, &to);
+		if (!who) {
+			ast_log(LOG_WARNING, "Nobody there??\n");
+			continue;
+		}
+		  /* if gone out of CLEAR DTMF mode */
+		if (!CLEARDTMF(c0) || !CLEARDTMF(c1)) {
+			*fo = NULL;
+			*rc = who;
+			bridge_cleanup(p0, p1);
+			return -3;
+		}
+		if (who == c0)
+			p0->ignoredtmf = 1;
+		else
+			p1->ignoredtmf = 1;
+		f = ast_read(who);
+		if (who == c0)
+			p0->ignoredtmf = 0;
+		else
+			p1->ignoredtmf = 0;
+		if (!f) {
+			*fo = NULL;
+			*rc = who;
+			bridge_cleanup(p0, p1);
+			return 0;
+		}
+		if ((f->frametype == AST_FRAME_CONTROL) && !(flags & AST_BRIDGE_IGNORE_SIGS)) {
+			*fo = f;
+			*rc = who;
+			bridge_cleanup(p0, p1);
+			return 0;
+		}
+		if ((f->frametype == AST_FRAME_VOICE) ||
+			(f->frametype == AST_FRAME_TEXT) ||
+			(f->frametype == AST_FRAME_VIDEO) || 
+			(f->frametype == AST_FRAME_IMAGE) ||
+			(f->frametype == AST_FRAME_DTMF)) {
+			if ((f->frametype == AST_FRAME_DTMF) && (flags & (AST_BRIDGE_DTMF_CHANNEL_0 | AST_BRIDGE_DTMF_CHANNEL_1))) {
+				if ((who == c0) && (flags & AST_BRIDGE_DTMF_CHANNEL_0)) {
+					*rc = c0;
+					*fo = f;
+					bridge_cleanup(p0, p1);
+					return 0;
+				} else
+				if ((who == c1) && (flags & AST_BRIDGE_DTMF_CHANNEL_1)) {
+					*rc = c1;
+					*fo = f;
+					bridge_cleanup(p0, p1);
+					return 0;
+				}
+			}
+			ast_frfree(f);
+		} else
+			ast_frfree(f);
+		/* Swap who gets priority */
+		cs[2] = cs[0];
+		cs[0] = cs[1];
+		cs[1] = cs[2];
+	}
+	return 0;
+}
+
+static int zt_indicate(struct ast_channel *chan, int condition);
+
+static int zt_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
+{
+	struct zt_pvt *p = newchan->pvt->pvt;
+	int x;
+	ast_log(LOG_DEBUG, "New owner for channel %d is %s\n", p->channel, newchan->name);
+	p->owner = newchan;
+	for (x=0;x<3;x++)
+		if (p->owners[x] == oldchan)
+			p->owners[x] = newchan;
+	if (newchan->state == AST_STATE_RINGING) 
+		zt_indicate(newchan, AST_CONTROL_RINGING);
+	return 0;
+}
+
+static int zt_ring_phone(struct zt_pvt *p)
+{
+	int x;
+	int res;
+	/* Make sure our transmit state is on hook */
+	x = 0;
+	x = ZT_ONHOOK;
+	res = ioctl(zap_fd(p->z), ZT_HOOK, &x);
+	do {
+		x = ZT_RING;
+		res = ioctl(zap_fd(p->z), ZT_HOOK, &x);
+#if 0
+		printf("Res: %d, error: %s\n", res, strerror(errno));
+#endif						
+		if (res) {
+			switch(errno) {
+			case EBUSY:
+			case EINTR:
+				/* Wait just in case */
+				usleep(10000);
+				continue;
+			case EINPROGRESS:
+				res = 0;
+				break;
+			default:
+				ast_log(LOG_WARNING, "Couldn't ring the phone: %s\n", strerror(errno));
+				res = 0;
+			}
+		}
+	} while (res);
+	return res;
+}
+
+static void *ss_thread(void *data);
+
+static struct ast_channel *zt_new(struct zt_pvt *, int, int, int, int);
+
+static int attempt_transfer(struct zt_pvt *p)
+{
+	/* In order to transfer, we need at least one of the channels to
+	   actually be in a call bridge.  We can't conference two applications
+	   together (but then, why would we want to?) */
+	if (p->owners[p->normalindex]->bridge) {
+		if (ast_channel_masquerade(p->owners[p->thirdcallindex], p->owners[p->normalindex]->bridge)) {
+			ast_log(LOG_WARNING, "Unable to masquerade %s as %s\n",
+					p->owners[p->normalindex]->bridge->name, p->owners[p->thirdcallindex]->name);
+			return -1;
+		}
+		/* Orphan the channel */
+		p->owners[p->thirdcallindex] = NULL;
+		p->thirdcallindex = -1;
+	} else if (p->owners[p->thirdcallindex]->bridge) {
+		if (ast_channel_masquerade(p->owners[p->normalindex], p->owners[p->thirdcallindex]->bridge)) {
+			ast_log(LOG_WARNING, "Unable to masquerade %s as %s\n",
+				p->owners[p->thirdcallindex]->bridge->name, p->owners[p->normalindex]->name);
+			return -1;
+		}
+		/* Orphan the normal channel */
+		p->owners[p->normalindex] = NULL;
+		p->normalindex = p->thirdcallindex;
+		p->thirdcallindex = -1;
+	} else {
+		ast_log(LOG_DEBUG, "Neither %s nor %s are in a bridge, nothing to transfer\n",
+					p->owners[p->normalindex]->name, p->owners[p->thirdcallindex]->name);
+		p->owners[p->thirdcallindex]->softhangup=1;
+	}
+	return 0;
+}
+
+struct ast_frame *zt_handle_event(struct ast_channel *ast)
+{
+	int res,x;
+	int index;
+	struct zt_pvt *p = ast->pvt->pvt;
+	pthread_t threadid;
+	pthread_attr_t attr;
+	struct ast_channel *chan;
+	pthread_attr_init(&attr);
+	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
+	index = zt_get_index(ast, p, 0);
+	p->f[index].frametype = AST_FRAME_NULL;
+	p->f[index].datalen = 0;
+	p->f[index].timelen = 0;
+	p->f[index].mallocd = 0;
+	p->f[index].offset = 0;
+	p->f[index].src = "zt_handle_event";
+	p->f[index].data = NULL;
+	if (index < 0)
+		return &p->f[index];
+	res = zt_get_event(zap_fd(p->z));
+	ast_log(LOG_DEBUG, "Got event %s(%d) on channel %d (index %d)\n", event2str(res), res, p->channel, index);
+	switch(res) {
+		case ZT_EVENT_DIALCOMPLETE:
+			if (p->inalarm) break;
+			if (ioctl(zap_fd(p->z),ZT_DIALING,&x) == -1) {
+				ast_log(LOG_DEBUG, "ZT_DIALING ioctl failed on %s\n",ast->name);
+				return NULL;
+			}
+			if (!x) /* if not still dialing in driver */
+			   {
+				zt_enable_ec(p);
+				p->dialing = 0;
+				if (ast->state == AST_STATE_DIALING) {
+#if 0
+					ast->state = AST_STATE_RINGING;
+#else
+					ast->state = AST_STATE_UP;
+					p->f[index].frametype = AST_FRAME_CONTROL;
+					p->f[index].subclass = AST_CONTROL_ANSWER;
+#endif				
+				}
+			}
+			break;
+		case ZT_EVENT_ALARM:
+			p->inalarm = 1;
+			/* fall through intentionally */
+		case ZT_EVENT_ONHOOK:
+			switch(p->sig) {
+			case SIG_FXOLS:
+			case SIG_FXOGS:
+			case SIG_FXOKS:
+				/* Check for some special conditions regarding call waiting */
+				if (index == p->normalindex) {
+					/* The normal line was hung up */
+					if (p->callwaitindex > -1) {
+						bridge_cleanup(p->owners[p->normalindex]->pvt->pvt,
+						    p->owners[p->callwaitindex]->pvt->pvt);
+						/* There's a call waiting call, so ring the phone */
+						p->owner = p->owners[p->callwaitindex];
+						if (option_verbose > 2) 
+							ast_verbose(VERBOSE_PREFIX_3 "Channel %s still has (callwait) call, ringing phone\n", p->owner);
+						p->needanswer[index] = 0;
+						p->needringing[index] = 0;
+						p->callwaitingrepeat = 0;
+						zt_ring_phone(p);
+					} else if (p->thirdcallindex > -1) {
+						if (p->transfer) {
+							if (attempt_transfer(p))
+								p->owners[p->thirdcallindex]->softhangup = 1;
+						} else
+							p->owners[p->thirdcallindex]->softhangup=1;
+					}
+				} else if (index == p->callwaitindex) {
+					/* Check to see if there is a normal call */
+					if (p->normalindex > -1) {
+						bridge_cleanup(p->owners[p->normalindex]->pvt->pvt,
+						    p->owners[p->callwaitindex]->pvt->pvt);
+						/* There's a call waiting call, so ring the phone */
+						p->owner = p->owners[p->normalindex];
+						if (option_verbose > 2) 
+							ast_verbose(VERBOSE_PREFIX_3 "Channel %s still has (normal) call, ringing phone\n", p->owner);
+						p->needanswer[index] = 0;
+						p->needringing[index] = 0;
+						p->callwaitingrepeat = 0;
+						zt_ring_phone(p);
+					}
+				} else if (index == p->thirdcallindex) {
+					if ((ast->state != AST_STATE_UP) && (ast->state != AST_STATE_RINGING) &&
+							(ast->state != AST_STATE_RING)) {
+						/* According to the LSSGR, we should kill everything now, and we 
+						   do, instead of ringing the phone */
+						if (p->normalindex > -1) 
+							p->owners[p->normalindex]->softhangup=1;
+						if (p->callwaitindex > -1) {
+							ast_log(LOG_WARNING, "Somehow there was a call wait\n");
+							p->owners[p->callwaitindex]->softhangup = 1;
+						}
+						
+					} else {
+						if (p->transfer) {
+							if (attempt_transfer(p))
+								p->owners[p->normalindex]->softhangup = 1;
+							else {
+								/* Don't actually hangup.  We're going to get transferred */
+								zt_disable_ec(p);
+								break;
+							}
+						} else 
+							p->owners[p->normalindex]->softhangup = 1;
+					}
+				}
+				/* Fall through */
+			default:
+				zt_disable_ec(p);
+				return NULL;
+			}
+			break;
+		case ZT_EVENT_RINGOFFHOOK:
+			if (p->inalarm) break;
+			switch(p->sig) {
+			case SIG_FXOLS:
+			case SIG_FXOGS:
+			case SIG_FXOKS:
+				switch(ast->state) {
+				case AST_STATE_RINGING:
+					zt_enable_ec(p);
+					ast->state = AST_STATE_UP;
+					p->f[index].frametype = AST_FRAME_CONTROL;
+					p->f[index].subclass = AST_CONTROL_ANSWER;
+					/* Make sure it stops ringing */
+					zt_set_hook(zap_fd(p->z), ZT_OFFHOOK);
+					ast_log(LOG_DEBUG, "channel %d answered\n", p->channel);
+					if (p->cidspill) {
+						/* Cancel any running CallerID spill */
+						free(p->cidspill);
+						p->cidspill = NULL;
+					}
+					p->dialing = 0;
+					return &p->f[index];
+				case AST_STATE_DOWN:
+					ast->state = AST_STATE_RING;
+					ast->rings = 1;
+					p->f[index].frametype = AST_FRAME_CONTROL;
+					p->f[index].subclass = AST_CONTROL_OFFHOOK;
+					ast_log(LOG_DEBUG, "channel %d picked up\n", p->channel);
+					return &p->f[index];
+				case AST_STATE_UP:
+					/* Make sure it stops ringing */
+					zt_set_hook(zap_fd(p->z), ZT_OFFHOOK);
+					/* Okay -- probably call waiting*/
+					break;
+				default:
+					ast_log(LOG_WARNING, "FXO phone off hook in weird state %d??\n", ast->state);
+				}
+				break;
+			case SIG_FXSLS:
+			case SIG_FXSGS:
+			case SIG_FXSKS:
+				if (ast->state == AST_STATE_RING) {
+					p->ringt = RINGT;
+				}
+				/* Fall through */
+			case SIG_EM:
+			case SIG_EMWINK:
+			case SIG_FEATD:
+				if (ast->state == AST_STATE_DOWN) {
+					if (option_debug)
+						ast_log(LOG_DEBUG, "Ring detected\n");
+					p->f[index].frametype = AST_FRAME_CONTROL;
+					p->f[index].subclass = AST_CONTROL_RING;
+				} else if (ast->state == AST_STATE_RINGING) {
+					if (option_debug)
+						ast_log(LOG_DEBUG, "Line answered\n");
+					p->f[index].frametype = AST_FRAME_CONTROL;
+					p->f[index].subclass = AST_CONTROL_ANSWER;
+					ast->state = AST_STATE_UP;
+				} else if (ast->state != AST_STATE_RING)
+					ast_log(LOG_WARNING, "Ring/Off-hook in strange state %d on channel %d\n", ast->state, p->channel);
+				break;
+			default:
+				ast_log(LOG_WARNING, "Don't know how to handle ring/off hoook for signalling %d\n", p->sig);
+			}
+			break;
+		case ZT_EVENT_RINGEROFF:
+			if (p->inalarm) break;
+			ast->rings++;
+			if ((ast->rings > 1) && (p->cidspill)) {
+				ast_log(LOG_WARNING, "Didn't finish Caller-ID spill.  Cancelling.\n");
+				free(p->cidspill);
+				p->cidspill = NULL;
+				p->callwaitcas = 0;
+			}
+			p->f[index].frametype = AST_FRAME_CONTROL;
+			p->f[index].subclass = AST_CONTROL_RINGING;
+			break;
+		case ZT_EVENT_RINGERON:
+			break;
+		case ZT_EVENT_NOALARM:
+			p->inalarm = 0;
+			break;
+		case ZT_EVENT_WINKFLASH:
+			if (p->inalarm) break;
+			switch(p->sig) {
+			case SIG_FXOLS:
+			case SIG_FXOGS:
+			case SIG_FXOKS:
+				ast_log(LOG_DEBUG, "Winkflash, index: %d, normal: %d, callwait: %d, thirdcall: %d\n",
+					index, p->normalindex, p->callwaitindex, p->thirdcallindex);
+				if (index == p->normalindex) {
+					if (p->callwaitindex > -1) {
+						tone_zone_play_tone(zap_fd(p->z), -1);
+						p->owner = p->owners[p->callwaitindex];
+						if (p->owner->state == AST_STATE_RINGING) {
+							p->owner->state = AST_STATE_UP;
+							p->needanswer[p->callwaitindex] = 1;
+						}
+						p->callwaitingrepeat = 0;
+						conf_clear(p);
+					} else if (p->thirdcallindex == -1) {
+						if (p->threewaycalling) {
+							if ((ast->state == AST_STATE_RINGING) ||
+									(ast->state == AST_STATE_UP) ||
+									(ast->state == AST_STATE_RING)) {
+								if (!alloc_pseudo(p)) {
+									/* Start three way call */
+									res = tone_zone_play_tone(zap_fd(p->z), ZT_TONE_DIALRECALL);
+									if (res)
+										ast_log(LOG_WARNING, "Unable to start dial recall tone on channel %d\n", p->channel);
+									chan = zt_new(p, AST_STATE_RESERVED,0,0,1);
+									p->owner = chan;
+									if (pthread_create(&threadid, &attr, ss_thread, chan)) {
+										ast_log(LOG_WARNING, "Unable to start simple switch on channel %d\n", p->channel);
+										res = tone_zone_play_tone(zap_fd(p->z), ZT_TONE_CONGESTION);
+										ast_hangup(chan);
+									} else {
+										if (option_verbose > 2)	
+											ast_verbose(VERBOSE_PREFIX_3 "Started three way call on channel %d (index %d)\n", p->channel, p->thirdcallindex);
+										conf_clear(p);
+									}		
+								} else
+									ast_log(LOG_WARNING, "Unable to allocate pseudo channel\n");
+							} else 
+								ast_log(LOG_DEBUG, "Flash when call not up or ringing\n");
+						}
+					} else {
+						if (option_debug)
+							ast_log(LOG_DEBUG, "Got flash with three way call up, dropping last call %d\n",
+								p->thirdcallindex);
+						/* Drop the last call and stop the conference */
+						if (option_verbose > 2)
+							ast_verbose(VERBOSE_PREFIX_3 "Dropping three-way call on %s\n", p->owners[p->thirdcallindex]->name);
+						p->owners[p->thirdcallindex]->softhangup=1;
+						conf_clear(p);
+					}
+				} else if (index == p->callwaitindex) {
+					if (p->normalindex > -1) {
+						p->owner = p->owners[p->normalindex];
+						p->callwaitingrepeat = 0;
+						conf_clear(p);
+					} else
+						ast_log(LOG_WARNING, "Wink/Flash on call wait, with no normal channel to flash to on channel %d?\n", p->channel);
+				} else if (index == p->thirdcallindex) {
+					if (p->normalindex > -1) {
+						if ((ast->state != AST_STATE_RINGING) && (ast->state != AST_STATE_UP) && (ast->state != AST_STATE_RING)) {
+							tone_zone_play_tone(zap_fd(p->z), -1);
+							p->owner = p->owners[p->normalindex];
+							ast_log(LOG_DEBUG, "Dumping incomplete three way call in state %d\n", ast->state);
+							return NULL;
+						}
+						p->owner = p->owners[p->normalindex];
+						p->owners[p->thirdcallindex]->fds[0] = zap_fd(p->pseudo);
+						p->callwaitingrepeat = 0;
+						if (p->owners[p->thirdcallindex]->state == AST_STATE_RINGING) {
+							/* If we were ringing, stop the ringing on the main line and start it on
+							   the pseudo */
+							tone_zone_play_tone(zap_fd(p->z), -1);
+							tone_zone_play_tone(zap_fd(p->pseudo), ZT_TONE_RINGTONE);
+						}
+						three_way(p);
+						if (option_verbose > 2)
+							ast_verbose(VERBOSE_PREFIX_3 "Established 3-way conference between %s and %s\n", 
+										p->owners[p->normalindex]->name, p->owners[p->thirdcallindex]->name);
+					} else {
+						ast_log(LOG_WARNING, "Wink/Flash on threeway call, with no normal channel to flash to on channel %d?\n", p->channel);
+						return NULL;
+					}
+				}
+				break;
+			case SIG_EM:
+			case SIG_EMWINK:
+			case SIG_FEATD:
+			case SIG_FXSLS:
+			case SIG_FXSGS:
+				if (p->dialing)
+					ast_log(LOG_DEBUG, "Ignoring wink on channel %d\n", p->channel);
+				else
+					ast_log(LOG_DEBUG, "Got wink in weird state %d on channel %d\n", ast->state, p->channel);
+				break;
+			default:
+				ast_log(LOG_WARNING, "Don't know how to handle ring/off hoook for signalling %d\n", p->sig);
+			}
+			break;
+		case ZT_EVENT_HOOKCOMPLETE:
+			if (p->inalarm) break;
+			switch(p->sig) {
+			case SIG_FXSLS:  /* only interesting for FXS */
+			case SIG_FXSGS:
+			case SIG_FXSKS:
+			case SIG_EM:
+			case SIG_EMWINK:
+				res = ioctl(zap_fd(p->z), ZT_DIAL, &p->dop);
+				if (res < 0) {
+					ast_log(LOG_WARNING, "Unable to initiate dialing on trunk channel %d\n", p->channel);
+					p->dop.dialstr[0] = '\0';
+					return NULL;
+				} else 
+					ast_log(LOG_DEBUG, "Sent deferred digit string: %s\n", p->dop.dialstr);
+				p->dop.dialstr[0] = '\0';
+				break;
+			default:
+				break;
+			}
+			break;
+		default:
+			ast_log(LOG_DEBUG, "Dunno what to do with event %d on channel %d\n", res, p->channel);
+	}
+	return &p->f[index];
+ }
+
+struct ast_frame *zt_exception(struct ast_channel *ast)
+{
+	struct zt_pvt *p = ast->pvt->pvt;
+	int res;
+	int usedindex=-1;
+	int index;
+	
+	index = zt_get_index(ast, p, 1);
+	
+	p->f[index].frametype = AST_FRAME_NULL;
+	p->f[index].datalen = 0;
+	p->f[index].timelen = 0;
+	p->f[index].mallocd = 0;
+	p->f[index].offset = 0;
+	p->f[index].subclass = 0;
+	p->f[index].src = "zt_exception";
+	p->f[index].data = NULL;
+		
+	if ((p->owner != p->owners[0]) && 
+	    (p->owner != p->owners[1]) &&
+		(p->owner != p->owners[2])) {
+		/* If nobody owns us, absorb the event appropriately, otherwise
+		   we loop indefinitely.  This occurs when, during call waiting, the
+		   other end hangs up our channel so that it no longer exists, but we
+		   have neither FLASH'd nor ONHOOK'd to signify our desire to
+		   change to the other channel. */
+		res = zt_get_event(zap_fd(p->z));
+		if ((p->callwaitindex > -1) && (p->normalindex > -1)) 
+			ast_log(LOG_WARNING, "Absorbing exception on unowned channel, but there is both a normal and call waiting call still here?\n");
+		if (p->callwaitindex > -1) {
+			tone_zone_play_tone(zap_fd(p->z), -1);
+			p->owner = p->owners[p->callwaitindex];
+			usedindex = p->callwaitindex;
+		} else if (p->normalindex > -1) {
+			tone_zone_play_tone(zap_fd(p->z), -1);
+			p->owner = p->owners[p->normalindex];
+			usedindex = p->normalindex;
+		} else {
+			ast_log(LOG_WARNING, "No call wait call, no normal call, what do I do?\n");
+			return NULL;
+		}
+		switch(res) {
+		case ZT_EVENT_ONHOOK:
+			zt_disable_ec(p);
+			if (p->owner) {
+				if (option_verbose > 2) 
+					ast_verbose(VERBOSE_PREFIX_3 "Channel %s still has call, ringing phone\n", p->owner->name);
+				zt_ring_phone(p);
+				p->callwaitingrepeat = 0;
+			} else
+				ast_log(LOG_WARNING, "Absorbed on hook, but nobody is left!?!?\n");
+			break;
+		case ZT_EVENT_WINKFLASH:
+			if (p->owner) {
+				if (option_verbose > 2) 
+					ast_verbose(VERBOSE_PREFIX_3 "Channel %d flashed to other channel %s\n", p->channel, p->owner->name);
+				if ((usedindex == p->callwaitindex) && (p->owner->state == AST_STATE_RINGING)) {
+					/* Answer the call wait if necessary */
+					p->needanswer[usedindex] = 1;
+					p->owner->state = AST_STATE_UP;
+				}
+				p->callwaitingrepeat = 0;
+			} else
+				ast_log(LOG_WARNING, "Absorbed on hook, but nobody is left!?!?\n");
+			break;
+		default:
+			ast_log(LOG_WARNING, "Don't know how to absorb event %s\n", event2str(res));
+		}
+		return &p->f[index];
+	}
+	/* If it's not us, return NULL immediately */
+	if (ast != p->owner)
+		return &p->f[index];
+
+	return zt_handle_event(ast);
+}
+
+struct ast_frame  *zt_read(struct ast_channel *ast)
+{
+	struct zt_pvt *p = ast->pvt->pvt;
+	int res,x;
+	int index;
+	unsigned char ireadbuf[READ_SIZE];
+	unsigned char *readbuf;
+	ZAP *z = NULL;
+	
+	pthread_mutex_lock(&p->lock);
+	
+	index = zt_get_index(ast, p, 0);
+	
+	p->f[index].frametype = AST_FRAME_NULL;
+	p->f[index].datalen = 0;
+	p->f[index].timelen = 0;
+	p->f[index].mallocd = 0;
+	p->f[index].offset = 0;
+	p->f[index].subclass = 0;
+	p->f[index].src = "zt_read";
+	p->f[index].data = NULL;
+	
+	/* Hang up if we don't really exist */
+	if (index < 0)	{
+		ast_log(LOG_WARNING, "We dont exist?\n");
+		pthread_mutex_unlock(&p->lock);
+		return NULL;
+	}
+	
+	if (p->ringt == 1) {
+		pthread_mutex_unlock(&p->lock);
+		return NULL;
+	}
+	else if (p->ringt > 0) 
+		p->ringt--;
+
+	if (p->needringing[index]) {
+		/* Send ringing frame if requested */
+		p->needringing[index] = 0;
+		p->f[index].frametype = AST_FRAME_CONTROL;
+		p->f[index].subclass = AST_CONTROL_RINGING;
+		pthread_mutex_unlock(&p->lock);
+		return &p->f[index];
+	}	
+	
+	if (p->needanswer[index]) {
+		/* Send ringing frame if requested */
+		p->needanswer[index] = 0;
+		p->f[index].frametype = AST_FRAME_CONTROL;
+		p->f[index].subclass = AST_CONTROL_ANSWER;
+		pthread_mutex_unlock(&p->lock);
+		return &p->f[index];
+	}	
+	
+	if (ast != p->owner) {
+		/* If it's not us.  If this isn't a three way call, return immediately */
+		if (!INTHREEWAY(p)) {
+			pthread_mutex_unlock(&p->lock);
+			return &p->f[index];
+		}
+		/* If it's not the third call, return immediately */
+		if (ast != p->owners[p->thirdcallindex]) {
+			pthread_mutex_unlock(&p->lock);
+			return &p->f[index];
+		}
+		if (!p->pseudo) 
+			ast_log(LOG_ERROR, "No pseudo channel\n");
+		z = p->pseudo;		
+	} else
+		z = p->z;
+
+	if (!z) {
+		ast_log(LOG_WARNING, "No zap structure?!?\n");
+		pthread_mutex_unlock(&p->lock);
+		return NULL;
+	}
+	
+	/* Check first for any outstanding DTMF characters */
+	if (strlen(p->dtmfq)) {
+		p->f[index].subclass = p->dtmfq[0];
+		memmove(p->dtmfq, p->dtmfq + 1, sizeof(p->dtmfq) - 1);
+		p->f[index].frametype = AST_FRAME_DTMF;
+		pthread_mutex_unlock(&p->lock);
+		return &p->f[index];
+	}
+	
+	if (ast->pvt->rawreadformat == AST_FORMAT_SLINEAR) {
+		/* Read into temporary buffer */
+		readbuf = ireadbuf;
+	} else if (ast->pvt->rawreadformat == AST_FORMAT_ULAW) {
+		/* Read ulaw directly into frame */
+		readbuf = ((unsigned char *)p->buffer[index]) + AST_FRIENDLY_OFFSET;
+	} else {
+		ast_log(LOG_WARNING, "Don't know how to read frames in format %d\n", ast->pvt->rawreadformat);
+		pthread_mutex_unlock(&p->lock);
+		return NULL;
+	}
+	CHECK_BLOCKING(ast);
+	if ((z != p->z) && (z != p->pseudo)) {
+		pthread_mutex_unlock(&p->lock);
+		return NULL;
+	}
+	res = zap_recchunk(z, readbuf, READ_SIZE, ((p->ignoredtmf) ? 0 : ZAP_DTMFINT));
+	ast->blocking = 0;
+	/* Check for hangup */
+	if (res < 0) {
+		if (res == -1) 
+			ast_log(LOG_WARNING, "zt_rec: %s\n", strerror(errno));
+		pthread_mutex_unlock(&p->lock);
+		return NULL;
+	}
+	if (res != READ_SIZE) {
+		if (option_debug)
+			ast_log(LOG_DEBUG, "Short read, must be DTMF or something...\n");
+		/* XXX UGLY!!  Zapata's DTMF handling is a bit ugly XXX */
+		if (zap_dtmfwaiting(z) && !strlen(zap_dtmfbuf(z))) {
+			zap_getdtmf(z, 1, NULL, 0, 1, 1, 0);
+		}
+		if (strlen(zap_dtmfbuf(z))) {
+			ast_log(LOG_DEBUG, "Got some dtmf ('%s')... on channel %s\n", zap_dtmfbuf(z), ast->name);
+			/* DTMF tone detected.  Queue and erturn */
+			if (p->callwaitcas) {
+				if (!strcmp(zap_dtmfbuf(z), "A") || !strcmp(zap_dtmfbuf(z), "D")) {
+					ast_log(LOG_DEBUG, "Got some DTMF, but it's for the CAS\n");
+					if (p->cidspill)
+						free(p->cidspill);
+					send_cwcidspill(p);
+				}
+				/* Return NULL */
+				pthread_mutex_unlock(&p->lock);
+				return &p->f[index];
+			} else {
+				strncpy(p->dtmfq + strlen(p->dtmfq), zap_dtmfbuf(z), sizeof(p->dtmfq) - strlen(p->dtmfq));
+				zap_clrdtmfn(z);
+			}
+		} else {
+			pthread_mutex_unlock(&p->lock);
+			return zt_handle_event(ast);
+		}
+		if (strlen(p->dtmfq)) {
+			p->f[index].subclass = p->dtmfq[0];
+			memmove(p->dtmfq, p->dtmfq + 1, sizeof(p->dtmfq) - 1);
+			p->f[index].frametype = AST_FRAME_DTMF;
+		}
+		pthread_mutex_unlock(&p->lock);
+		return &p->f[index];
+	}
+	if (p->callwaitingrepeat)
+		p->callwaitingrepeat--;
+	/* Repeat callwaiting */
+	if (p->callwaitingrepeat == 1) {
+		p->callwaitrings++;
+		zt_callwait(ast);
+	}
+	if (ast->pvt->rawreadformat == AST_FORMAT_SLINEAR) {
+		for (x=0;x<READ_SIZE;x++) {
+			p->buffer[index][x + AST_FRIENDLY_OFFSET/2] = ast_mulaw[readbuf[x]];
+		}
+		p->f[index].datalen = READ_SIZE * 2;
+	} else 
+		p->f[index].datalen = READ_SIZE;
+
+	/* Handle CallerID Transmission */
+	if (p->cidspill &&((ast->state == AST_STATE_UP) || (ast->rings == 1)))
+		send_callerid(p);
+
+	p->f[index].frametype = AST_FRAME_VOICE;
+	p->f[index].subclass = ast->pvt->rawreadformat;
+	p->f[index].timelen = READ_SIZE/8;
+	p->f[index].mallocd = 0;
+	p->f[index].offset = AST_FRIENDLY_OFFSET;
+	p->f[index].data = p->buffer[index] + AST_FRIENDLY_OFFSET/2;
+#if 0
+	ast_log(LOG_DEBUG, "Read %d of voice on %s\n", p->f[index].datalen, ast->name);
+#endif	
+	if (p->dialing) {
+		/* Whoops, we're still dialing, don't send anything */
+		p->f[index].frametype = AST_FRAME_NULL;
+		p->f[index].subclass = 0;
+		p->f[index].timelen = 0;
+		p->f[index].mallocd = 0;
+		p->f[index].offset = 0;
+		p->f[index].data = NULL;
+		p->f[index].datalen= 0;
+	}
+	pthread_mutex_unlock(&p->lock);
+	return &p->f[index];
+}
+
+static int my_zt_write(struct zt_pvt *p, unsigned char *buf, int len, int threeway)
+{
+	int sent=0;
+	int size;
+	int res;
+	int fd;
+	if (threeway) 
+		fd = zap_fd(p->pseudo);
+	else
+		fd = zap_fd(p->z);
+	while(len) {
+		size = len;
+		if (size > READ_SIZE)
+			size = READ_SIZE;
+		res = write(fd, buf, size);
+		if (res != size) {
+			ast_log(LOG_DEBUG, "Write returned %d (%s) on channel %d\n", res, strerror(errno), p->channel);
+			return sent;
+		}
+		len -= size;
+		buf += size;
+	}
+	return sent;
+}
+
+static int zt_write(struct ast_channel *ast, struct ast_frame *frame)
+{
+	struct zt_pvt *p = ast->pvt->pvt;
+	int x;
+	int res;
+	unsigned char outbuf[4096];
+	short *inbuf;
+	
+	if (ast != p->owner) {
+		/* If it's not us.  If this isn't a three way call, return immediately */
+		if (!INTHREEWAY(p)) {
+			return 0;
+		}
+		/* If it's not the third call, return immediately */
+		if (ast != p->owners[p->thirdcallindex]) {
+			return 0;
+		}
+	}
+	
+	/* Write a frame of (presumably voice) data */
+	if (frame->frametype != AST_FRAME_VOICE) {
+		ast_log(LOG_WARNING, "Don't know what to do with frame type '%d'\n", frame->frametype);
+		return -1;
+	}
+	if ((frame->subclass != AST_FORMAT_SLINEAR) && (frame->subclass != AST_FORMAT_ULAW)) {
+		ast_log(LOG_WARNING, "Cannot handle frames in %d format\n", frame->subclass);
+		return -1;
+	}
+	if (p->dialing) {
+#if 0
+		if (option_debug)
+#endif		
+			ast_log(LOG_DEBUG, "Dropping frame since I'm still dialing on %s...\n",ast->name);
+		return 0;
+	}
+	if (p->cidspill) {
+#if 0
+		if (option_debug)
+#endif		
+			ast_log(LOG_DEBUG, "Dropping frame since I've still got a callerid spill\n");
+		return 0;
+	}
+	/* Return if it's not valid data */
+	if (!frame->data || !frame->datalen)
+		return 0;
+	if (frame->datalen > sizeof(outbuf) * 2) {
+		ast_log(LOG_WARNING, "Frame too large\n");
+		return 0;
+	}
+	if (frame->subclass == AST_FORMAT_SLINEAR) {
+		inbuf = frame->data;
+		for (x=0;x<frame->datalen/2;x++)
+			outbuf[x] = ast_lin2mu[inbuf[x]+32768];
+		res = my_zt_write(p, outbuf, frame->datalen/2, (ast != p->owner));
+	} else {
+		/* uLaw already */
+		res = my_zt_write(p, (unsigned char *)frame->data, frame->datalen, (ast != p->owner));
+	}
+	if (res < 0) {
+		ast_log(LOG_WARNING, "write failed: %s\n", strerror(errno));
+		return -1;
+	} else if (res != frame->datalen/2) {
+		/* Some sort of an event */
+		return 0;
+	}
+	return 0;
+}
+
+static int zt_indicate(struct ast_channel *chan, int condition)
+{
+	struct zt_pvt *p = chan->pvt->pvt;
+	int res=-1;
+	switch(condition) {
+	case AST_CONTROL_BUSY:
+		res = tone_zone_play_tone(zap_fd(p->z), ZT_TONE_BUSY);
+		break;
+	case AST_CONTROL_RINGING:
+		res = tone_zone_play_tone(zap_fd(p->z), ZT_TONE_RINGTONE);
+		if (chan->state != AST_STATE_UP) {
+			if ((chan->state != AST_STATE_RING) ||
+				((p->sig != SIG_FXSKS) &&
+				 (p->sig != SIG_FXSLS) &&
+				 (p->sig != SIG_FXSGS)))
+				chan->state = AST_STATE_RINGING;
+		}
+		break;
+	case AST_CONTROL_CONGESTION:
+		res = tone_zone_play_tone(zap_fd(p->z), ZT_TONE_CONGESTION);
+		break;
+	default:
+		ast_log(LOG_WARNING, "Don't know how to set condition %d on channel %s\n", condition, chan->name);
+	}
+	return res;
+}
+
+static struct ast_channel *zt_new(struct zt_pvt *i, int state, int startpbx, int callwaiting, int thirdcall)
+{
+	struct ast_channel *tmp;
+	int x;
+	for (x=0;x<3;x++)
+		if (!i->owners[x])
+			break;
+	if (x > 2) {
+		ast_log(LOG_WARNING, "No available owner slots\n");
+		return NULL;
+	}
+	tmp = ast_channel_alloc();
+	if (tmp) {
+		snprintf(tmp->name, sizeof(tmp->name), "Zap/%d-%d", i->channel, x + 1);
+		tmp->type = type;
+		tmp->fds[0] = zap_fd(i->z);
+		tmp->nativeformats = AST_FORMAT_SLINEAR | AST_FORMAT_ULAW;
+		/* Start out assuming ulaw since it's smaller :) */
+		tmp->pvt->rawreadformat = AST_FORMAT_ULAW;
+		tmp->readformat = AST_FORMAT_ULAW;
+		tmp->pvt->rawwriteformat = AST_FORMAT_ULAW;
+		tmp->writeformat = AST_FORMAT_ULAW;
+		
+		tmp->state = state;
+		if (state == AST_STATE_RING)
+			tmp->rings = 1;
+		tmp->pvt->pvt = i;
+		tmp->pvt->send_digit = zt_digit;
+		tmp->pvt->call = zt_call;
+		tmp->pvt->hangup = zt_hangup;
+		tmp->pvt->answer = zt_answer;
+		tmp->pvt->read = zt_read;
+		tmp->pvt->write = zt_write;
+		tmp->pvt->bridge = zt_bridge;
+		tmp->pvt->exception = zt_exception;
+		tmp->pvt->indicate = zt_indicate;
+		tmp->pvt->fixup = zt_fixup;
+		tmp->pvt->setoption = zt_setoption;
+		if (strlen(i->language))
+			strncpy(tmp->language, i->language, sizeof(tmp->language));
+		/* Keep track of who owns it */
+		i->owners[x] = tmp;
+		if (!i->owner)
+			i->owner = tmp;
+		if (callwaiting) {
+			if (i->callwaitindex > -1)
+				ast_log(LOG_WARNING, "channel %d already has a call wait call\n", i->channel);
+			i->callwaitindex = x;
+		} else if (thirdcall) {
+			if (i->thirdcallindex > -1)
+				ast_log(LOG_WARNING, "channel %d already has a third call\n", i->channel);
+			i->thirdcallindex = x;
+		} else {
+			if (i->normalindex > -1) 
+				ast_log(LOG_WARNING, "channel %d already has a normal call\n", i->channel);
+			i->normalindex = x;
+		}
+		ast_pthread_mutex_lock(&usecnt_lock);
+		usecnt++;
+		ast_pthread_mutex_unlock(&usecnt_lock);
+		ast_update_use_count();
+		strncpy(tmp->context, i->context, sizeof(tmp->context));
+		if (strlen(i->exten))
+			strncpy(tmp->exten, i->exten, sizeof(tmp->exten));
+		if (startpbx) {
+			if (strlen(i->callerid))
+				tmp->callerid = strdup(i->callerid);
+			if (ast_pbx_start(tmp)) {
+				ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
+				ast_hangup(tmp);
+				tmp = NULL;
+			}
+		}
+	} else
+		ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
+	return tmp;
+}
+
+
+static int bump_gains(struct zt_pvt *p)
+{
+	int res;
+	/* Bump receive gain by 9.0db */
+	res = set_actual_gain(zap_fd(p->z), 0, p->rxgain + 5.0, p->txgain);
+	if (res) {
+		ast_log(LOG_WARNING, "Unable to bump gain\n");
+		return -1;
+	}
+	return 0;
+}
+
+static int restore_gains(struct zt_pvt *p)
+{
+	int res;
+	/* Bump receive gain by 9.0db */
+	res = set_actual_gain(zap_fd(p->z), 0, p->rxgain, p->txgain);
+	if (res) {
+		ast_log(LOG_WARNING, "Unable to restore gains: %s\n", strerror(errno));
+		return -1;
+	}
+	return 0;
+}
+
+static void *ss_thread(void *data)
+{
+	struct ast_channel *chan = data;
+	struct zt_pvt *p = chan->pvt->pvt;
+	char exten[AST_MAX_EXTENSION];
+	char exten2[AST_MAX_EXTENSION];
+	unsigned char buf[256];
+	char cid[256];
+	struct callerid_state *cs;
+	char *name=NULL, *number=NULL;
+	int flags;
+	int i;
+	int timeout;
+	char *s1, *s2;
+	int len = 0;
+	int res;
+	if (option_verbose > 2) 
+		ast_verbose( VERBOSE_PREFIX_3 "Starting simple switch on '%s'\n", chan->name);
+	zap_clrdtmf(p->z);
+	switch(p->sig) {
+	case SIG_FEATD:
+	case SIG_EMWINK:
+		zap_wink(p->z);
+		/* Fall through */
+	case SIG_EM:
+		res = tone_zone_play_tone(zap_fd(p->z), -1);
+		zap_clrdtmf(p->z);
+		/* Wait for the first digit (up to 1 second). */
+		res = zap_getdtmf(p->z, 1, NULL, 0, 1000, 1000, ZAP_TIMEOUTOK | ZAP_HOOKEXIT);
+
+		if (res == 1) {
+			/* If we got it, get the rest */
+			res = zap_getdtmf(p->z, 50, NULL, 0, 250, 15000, ZAP_TIMEOUTOK | ZAP_HOOKEXIT);
+		}
+		if (res == -1) {
+			ast_log(LOG_WARNING, "getdtmf on channel %d: %s\n", p->channel, strerror(errno));
+			ast_hangup(chan);
+			return NULL;
+		} else if (res < 0) {
+			ast_log(LOG_DEBUG, "Got hung up before digits finished\n");
+			ast_hangup(chan);
+			return NULL;
+		}
+		strncpy(exten, zap_dtmfbuf(p->z), sizeof(exten));
+		if (!strlen(exten))
+			strncpy(exten, "s", sizeof(exten));
+		if (p->sig == SIG_FEATD) {
+			if (exten[0] == '*') {
+				strncpy(exten2, exten, sizeof(exten2));
+				/* Parse out extension and callerid */
+				s1 = strtok(exten2 + 1, "*");
+				s2 = strtok(NULL, "*");
+				if (s2) {
+					if (strlen(p->callerid))
+						chan->callerid = strdup(p->callerid);
+					else
+						chan->callerid = strdup(s1);
+					strncpy(exten, s2, sizeof(exten));
+				} else
+					strncpy(exten, s1, sizeof(exten));
+			} else
+				ast_log(LOG_WARNING, "Got a non-Feature Group D input on channel %d.  Assuming E&M Wink instead\n", p->channel);
+		}
+		zt_enable_ec(p);
+		if (ast_exists_extension(chan, chan->context, exten, 1, chan->callerid)) {
+			strncpy(chan->exten, exten, sizeof(chan->exten));
+			zap_clrdtmf(p->z);
+			res = ast_pbx_run(chan);
+			if (res) {
+				ast_log(LOG_WARNING, "PBX exited non-zero\n");
+				res = tone_zone_play_tone(zap_fd(p->z), ZT_TONE_CONGESTION);
+			}
+			return NULL;
+		} else {
+			if (option_verbose > 2)
+				ast_verbose(VERBOSE_PREFIX_2 "Unknown extension '%s' in context '%s' requested\n", exten, chan->context);
+			sleep(2);
+			res = tone_zone_play_tone(zap_fd(p->z), ZT_TONE_INFO);
+			if (res < 0)
+				ast_log(LOG_WARNING, "Unable to start special tone on %d\n", p->channel);
+			else
+				sleep(1);
+			res = ast_streamfile(chan, "ss-noservice", chan->language);
+			if (res >= 0)
+				ast_waitstream(chan, "");
+			res = tone_zone_play_tone(zap_fd(p->z), ZT_TONE_CONGESTION);
+			ast_hangup(chan);
+			return NULL;
+		}
+		break;
+	case SIG_FXOLS:
+	case SIG_FXOGS:
+	case SIG_FXOKS:
+		/* Read the first digit */
+		timeout = firstdigittimeout;
+		while(len < AST_MAX_EXTENSION-1) {
+			res = ast_waitfordigit(chan, timeout);
+			if (res < 0) {
+				ast_log(LOG_DEBUG, "waitfordigit returned < 0...\n");
+				res = tone_zone_play_tone(zap_fd(p->z), -1);
+				ast_hangup(chan);
+				return NULL;
+			} else if (res == 0) {
+				ast_log(LOG_DEBUG, "not enough digits...\n");
+				res = tone_zone_play_tone(zap_fd(p->z), ZT_TONE_CONGESTION);
+				zt_wait_event(zap_fd(p->z));
+				ast_hangup(chan);
+				return NULL;
+			} else {
+				exten[len++]=res;
+            			exten[len] = '\0';
+			}
+			if (!ast_ignore_pattern(chan->context, exten))
+				tone_zone_play_tone(zap_fd(p->z), -1);
+			if (ast_exists_extension(chan, chan->context, exten, 1, p->callerid)) {
+				res = tone_zone_play_tone(zap_fd(p->z), -1);
+				strncpy(chan->exten, exten, sizeof(chan->exten));
+				if (strlen(p->callerid) && !p->hidecallerid)
+					chan->callerid = strdup(p->callerid);
+				chan->state = AST_STATE_RING;
+				zt_enable_ec(p);
+				res = ast_pbx_run(chan);
+				if (res) {
+					ast_log(LOG_WARNING, "PBX exited non-zero\n");
+					res = tone_zone_play_tone(zap_fd(p->z), ZT_TONE_CONGESTION);
+				}						
+				return NULL;
+			} else if (p->callwaiting && !strcmp(exten, "*70")) {
+				if (option_verbose > 2) 
+					ast_verbose(VERBOSE_PREFIX_3 "Disabling call waiting on %s\n", chan->name);
+				/* Disable call waiting if enabled */
+				p->callwaiting = 0;
+				res = tone_zone_play_tone(zap_fd(p->z), ZT_TONE_DIALRECALL);
+				if (res) {
+					ast_log(LOG_WARNING, "Unable to do dial recall on channel %s: %s\n", 
+						chan->name, strerror(errno));
+				}
+				len = 0;
+				ioctl(zap_fd(p->z),ZT_CONFDIAG,&len);
+				memset(exten, 0, sizeof(exten));
+				timeout = firstdigittimeout;
+					
+			} else if (!strcmp(exten,"*8#")){
+				/* Scan all channels and see if any there
+				 * ringing channqels with that have call groups
+				 * that equal this channels pickup group  
+				 */
+				struct zt_pvt *chan_pvt=iflist;
+				while(chan_pvt!=NULL){
+					if((p!=chan_pvt)&&
+					  ((p->pickupgroup & chan_pvt->callgroup)==chan_pvt->callgroup)&&
+					  (chan_pvt->owner && (chan_pvt->owner->state==AST_STATE_RING || chan_pvt->owner->state == AST_STATE_RINGING))
+					  ){
+					  	/* Switch us from Third call to Call Wait */
+						p->callwaitindex = p->thirdcallindex;
+						p->thirdcallindex = -1;
+						ast_log(LOG_DEBUG, "Call pickup on chan %s\n",chan_pvt->owner->name);
+						p->needanswer[zt_get_index(chan, p, 1)]=1;
+						zt_enable_ec(p);
+						if(ast_channel_masquerade(chan_pvt->owner,p->owner))
+							printf("Error Masquerade failed on call-pickup\n");
+						/* Do not hang up masqueraded channel */
+						return NULL;
+					}
+					chan_pvt=chan_pvt->next;
+				}
+				ast_log(LOG_DEBUG, "No call pickup possible...\n");
+				res = tone_zone_play_tone(zap_fd(p->z), ZT_TONE_CONGESTION);
+				zt_wait_event(zap_fd(p->z));
+				ast_hangup(chan);
+				return NULL;
+			} else if (!p->hidecallerid && !strcmp(exten, "*67")) {
+				if (option_verbose > 2) 
+					ast_verbose(VERBOSE_PREFIX_3 "Disabling Caller*ID on %s\n", chan->name);
+				/* Disable Caller*ID if enabled */
+				p->hidecallerid = 1;
+				if (chan->callerid)
+					free(chan->callerid);
+				chan->callerid = NULL;
+				res = tone_zone_play_tone(zap_fd(p->z), ZT_TONE_DIALRECALL);
+				if (res) {
+					ast_log(LOG_WARNING, "Unable to do dial recall on channel %s: %s\n", 
+						chan->name, strerror(errno));
+				}
+				len = 0;
+				memset(exten, 0, sizeof(exten));
+				timeout = firstdigittimeout;
+					
+			} else if (p->hidecallerid && !strcmp(exten, "*82")) {
+				if (option_verbose > 2) 
+					ast_verbose(VERBOSE_PREFIX_3 "Enabling Caller*ID on %s\n", chan->name);
+				/* Enable Caller*ID if enabled */
+				p->hidecallerid = 0;
+				if (chan->callerid)
+					free(chan->callerid);
+				chan->callerid = NULL;
+				res = tone_zone_play_tone(zap_fd(p->z), ZT_TONE_DIALRECALL);
+				if (res) {
+					ast_log(LOG_WARNING, "Unable to do dial recall on channel %s: %s\n", 
+						chan->name, strerror(errno));
+				}
+				len = 0;
+				memset(exten, 0, sizeof(exten));
+				timeout = firstdigittimeout;
+			} else if (!strcmp(exten, "*0")) {
+				int index = zt_get_index(chan, p, 0);
+				struct ast_channel *nbridge = 
+					p->owners[p->normalindex]->bridge;
+				struct zt_pvt *pbridge = NULL;
+				  /* set up the private struct of the bridged one, if any */
+				if (nbridge) pbridge = nbridge->pvt->pvt;
+				if ((p->thirdcallindex > -1) &&
+				    (index == p->thirdcallindex) &&
+				    nbridge && 
+				    (!strcmp(nbridge->type,"Zap")) &&
+				    ISTRUNK(pbridge)) {
+					int func = ZT_FLASH;
+					/* flash hookswitch */
+					if (ioctl(zap_fd(pbridge->z),ZT_HOOK,&func) == -1) {
+						ast_log(LOG_WARNING, "Unable to flash external trunk on channel %s: %s\n", 
+							nbridge->name, strerror(errno));
+					}				
+					p->owner = p->owners[p->normalindex];
+					ast_hangup(chan);
+					return NULL;
+				} else {
+					tone_zone_play_tone(zap_fd(p->z), ZT_TONE_CONGESTION);
+					zt_wait_event(zap_fd(p->z));
+					tone_zone_play_tone(zap_fd(p->z), -1);
+					p->owner = p->owners[p->normalindex];
+					ast_hangup(chan);
+					return NULL;
+				}					
+			} else if (!ast_canmatch_extension(chan, chan->context, exten, 1, chan->callerid) &&
+							((exten[0] != '*') || (strlen(exten) > 2))) {
+				if (option_debug)
+					ast_log(LOG_DEBUG, "Can't match %s from '%s' in context %s\n", exten, chan->callerid ? chan->callerid : "<Unknown Caller>", chan->context);
+				break;
+			}
+			timeout = gendigittimeout;
+			if (len && !ast_ignore_pattern(chan->context, exten))
+				tone_zone_play_tone(zap_fd(p->z), -1);
+		}
+		break;
+	case SIG_FXSLS:
+	case SIG_FXSGS:
+	case SIG_FXSKS:
+		if (p->use_callerid) {
+			cs = callerid_new();
+			if (cs) {
+#if 1
+				bump_gains(p);
+#endif				
+				len = 0;
+				for(;;) {	
+					i = ZT_IOMUX_READ | ZT_IOMUX_SIGEVENT;
+					if ((res = ioctl(zap_fd(p->z), ZT_IOMUX, &i)))	{
+						ast_log(LOG_WARNING, "I/O MUX failed: %s\n", strerror(errno));
+						callerid_free(cs);
+						ast_hangup(chan);
+						return NULL;
+					}
+					if (i & ZT_IOMUX_SIGEVENT) {
+						res = zt_get_event(zap_fd(p->z));
+						ast_log(LOG_NOTICE, "Got event %d (%s)...\n", res, event2str(res));
+						res = 0;
+						break;
+					} else if (i & ZT_IOMUX_READ) {
+						res = read(zap_fd(p->z), buf, sizeof(buf));
+						if (res < 0) {
+							if (errno != ELAST) {
+								ast_log(LOG_WARNING, "read returned error: %s\n", strerror(errno));
+								callerid_free(cs);
+								ast_hangup(chan);
+								return NULL;
+							}
+							break;
+						}
+						if (p->ringt) 
+							p->ringt--;
+						if (p->ringt == 1) {
+							res = -1;
+							break;
+						}
+						res = callerid_feed(cs, buf, res);
+						if (res < 0) {
+							ast_log(LOG_WARNING, "CallerID feed failed: %s\n", strerror(errno));
+							break;
+						} else if (res)
+							break;
+					}
+				}
+				if (res == 1) {
+					callerid_get(cs, &name, &number, &flags);
+					if (option_debug)
+						ast_log(LOG_DEBUG, "CallerID number: %s, name: %s, flags=%d\n", number, name, flags);
+				}
+#if 1
+				restore_gains(p);
+#endif				
+				if (res < 0) {
+					ast_log(LOG_WARNING, "CallerID returned with error on channel '%s'\n", chan->name);
+				}
+			} else
+				ast_log(LOG_WARNING, "Unable to get caller ID space\n");
+		}
+		if (name && number) {
+			snprintf(cid, sizeof(cid), "\"%s\" <%s>", name, number);
+		} else if (name) {
+			snprintf(cid, sizeof(cid), "\"%s\"", name);
+		} else if (number) {
+			snprintf(cid, sizeof(cid), "%s", number);
+		} else {
+			strcpy(cid, "");
+		}
+		if (strlen(cid))
+			chan->callerid = strdup(cid);
+		chan->state = AST_STATE_RING;
+		chan->rings = 1;
+		p->ringt = RINGT;
+		zt_enable_ec(p);
+		res = ast_pbx_run(chan);
+		if (res) {
+			ast_hangup(chan);
+			ast_log(LOG_WARNING, "PBX exited non-zero\n");
+		}
+		return NULL;
+	default:
+		ast_log(LOG_WARNING, "Don't know how to handle simple switch with signalling %s on channel %d\n", sig2str(p->sig), p->channel);
+		res = tone_zone_play_tone(zap_fd(p->z), ZT_TONE_CONGESTION);
+		if (res < 0)
+				ast_log(LOG_WARNING, "Unable to play congestion tone on channel %d\n", p->channel);
+	}
+	res = tone_zone_play_tone(zap_fd(p->z), ZT_TONE_CONGESTION);
+	if (res < 0)
+			ast_log(LOG_WARNING, "Unable to play congestion tone on channel %d\n", p->channel);
+	ast_hangup(chan);
+	return NULL;
+}
+
+static int handle_init_event(struct zt_pvt *i, int event)
+{
+	int res;
+	pthread_t threadid;
+	pthread_attr_t attr;
+	struct ast_channel *chan;
+	pthread_attr_init(&attr);
+	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
+	/* Handle an event on a given channel for the monitor thread. */
+	switch(event) {
+	case ZT_EVENT_RINGOFFHOOK:
+		if (i->inalarm) break;
+		/* Got a ring/answer.  What kind of channel are we? */
+		switch(i->sig) {
+		case SIG_FXOLS:
+		case SIG_FXOGS:
+		case SIG_FXOKS:
+			if (i->immediate) {
+				zt_enable_ec(i);
+				/* The channel is immediately up.  Start right away */
+				res = tone_zone_play_tone(zap_fd(i->z), ZT_TONE_RINGTONE);
+				chan = zt_new(i, AST_STATE_RING, 1, 0, 0);
+				if (!chan)  {
+					ast_log(LOG_WARNING, "Unable to start PBX on channel %d\n", i->channel);
+					res = tone_zone_play_tone(zap_fd(i->z), ZT_TONE_CONGESTION);
+					if (res < 0)
+						ast_log(LOG_WARNING, "Unable to play congestion tone on channel %d\n", i->channel);
+				}
+			} else {
+				res = tone_zone_play_tone(zap_fd(i->z), ZT_TONE_DIALTONE);
+				if (res < 0) 
+					ast_log(LOG_WARNING, "Unable to play dialtone on channel %d\n", i->channel);
+				/* Check for callerid, digits, etc */
+				chan = zt_new(i, AST_STATE_DOWN, 0, 0, 0);
+				if (pthread_create(&threadid, &attr, ss_thread, chan)) {
+					ast_log(LOG_WARNING, "Unable to start simple switch thread on channel %d\n", i->channel);
+					res = tone_zone_play_tone(zap_fd(i->z), ZT_TONE_CONGESTION);
+					if (res < 0)
+						ast_log(LOG_WARNING, "Unable to play congestion tone on channel %d\n", i->channel);
+					ast_hangup(chan);
+				}
+#if 0
+				printf("Created thread %ld detached in switch\n", threadid);
+#endif
+			}
+			break;
+		case SIG_FXSLS:
+		case SIG_FXSGS:
+		case SIG_FXSKS:
+				i->ringt = RINGT;
+				/* Fall through */
+		case SIG_EMWINK:
+		case SIG_FEATD:
+		case SIG_EM:
+				/* Check for callerid, digits, etc */
+				chan = zt_new(i, AST_STATE_RING, 0, 0, 0);
+				if (pthread_create(&threadid, &attr, ss_thread, chan)) {
+					ast_log(LOG_WARNING, "Unable to start simple switch thread on channel %d\n", i->channel);
+					res = tone_zone_play_tone(zap_fd(i->z), ZT_TONE_CONGESTION);
+					if (res < 0)
+						ast_log(LOG_WARNING, "Unable to play congestion tone on channel %d\n", i->channel);
+					ast_hangup(chan);
+				}
+#if 0
+				printf("Created thread %ld detached in switch(2)\n", threadid);
+#endif
+				break;
+		default:
+			ast_log(LOG_WARNING, "Don't know how to handle ring/answer with signalling %s on channel %d\n", sig2str(i->sig), i->channel);
+			res = tone_zone_play_tone(zap_fd(i->z), ZT_TONE_CONGESTION);
+			if (res < 0)
+					ast_log(LOG_WARNING, "Unable to play congestion tone on channel %d\n", i->channel);
+			return -1;
+		}
+		break;
+	case ZT_EVENT_NOALARM:
+		i->inalarm = 0;
+		break;
+	case ZT_EVENT_ALARM:
+		i->inalarm = 1;
+		/* fall thru intentionally */
+	case ZT_EVENT_WINKFLASH:
+	case ZT_EVENT_ONHOOK:
+		/* Back on hook.  Hang up. */
+		switch(i->sig) {
+		case SIG_FXOLS:
+		case SIG_FXOGS:
+		case SIG_FXOKS:
+		case SIG_FEATD:
+		case SIG_EM:
+		case SIG_EMWINK:
+		case SIG_FXSLS:
+		case SIG_FXSGS:
+		case SIG_FXSKS:
+			zt_disable_ec(i);
+			res = tone_zone_play_tone(zap_fd(i->z), -1);
+			zt_set_hook(zap_fd(i->z), ZT_ONHOOK);
+			break;
+		default:
+			ast_log(LOG_WARNING, "Don't know hwo to handle on hook with signalling %s on channel %d\n", sig2str(i->sig), i->channel);
+			res = tone_zone_play_tone(zap_fd(i->z), -1);
+			return -1;
+		}
+		break;
+	}
+	return 0;
+}
+
+static void *do_monitor(void *data)
+{
+	fd_set efds;
+	int n, res;
+	struct zt_pvt *i;
+	/* This thread monitors all the frame relay interfaces which are not yet in use
+	   (and thus do not have a separate thread) indefinitely */
+	/* From here on out, we die whenever asked */
+#if 0
+	if (pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL)) {
+		ast_log(LOG_WARNING, "Unable to set cancel type to asynchronous\n");
+		return NULL;
+	}
+	ast_log(LOG_DEBUG, "Monitor starting...\n");
+#endif
+	for(;;) {
+		/* Lock the interface list */
+		if (ast_pthread_mutex_lock(&iflock)) {
+			ast_log(LOG_ERROR, "Unable to grab interface lock\n");
+			return NULL;
+		}
+		/* Build the stuff we're going to select on, that is the socket of every
+		   zt_pvt that does not have an associated owner channel */
+		n = -1;
+		FD_ZERO(&efds);
+		i = iflist;
+		while(i) {
+			if (FD_ISSET(zap_fd(i->z), &efds)) 
+				ast_log(LOG_WARNING, "Descriptor %d appears twice?\n", zap_fd(i->z));
+			if (!i->owner) {
+				/* This needs to be watched, as it lacks an owner */
+				FD_SET(zap_fd(i->z), &efds);
+				if (zap_fd(i->z) > n)
+					n = zap_fd(i->z);
+			}
+			i = i->next;
+		}
+		/* Okay, now that we know what to do, release the interface lock */
+		ast_pthread_mutex_unlock(&iflock);
+		
+		pthread_testcancel();
+		/* Wait indefinitely for something to happen */
+		res = select(n + 1, NULL, NULL, &efds, NULL);
+		pthread_testcancel();
+		/* Okay, select has finished.  Let's see what happened.  */
+		if (res < 0) {
+			if ((errno != EAGAIN) && (errno != EINTR))
+				ast_log(LOG_WARNING, "select return %d: %s\n", res, strerror(errno));
+			continue;
+		}
+		/* Alright, lock the interface list again, and let's look and see what has
+		   happened */
+		if (ast_pthread_mutex_lock(&iflock)) {
+			ast_log(LOG_WARNING, "Unable to lock the interface list\n");
+			continue;
+		}
+		i = iflist;
+		while(i) {
+			if (FD_ISSET(zap_fd(i->z), &efds)) {
+				if (i->owner) {
+					ast_log(LOG_WARNING, "Whoa....  I'm owned but found (%d)...\n", zap_fd(i->z));
+					i = i->next;
+					continue;
+				}
+				res = zt_get_event(zap_fd(i->z));
+				if (option_debug)
+					ast_log(LOG_DEBUG, "Monitor doohicky got event %s on channel %d\n", event2str(res), i->channel);
+				handle_init_event(i, res);
+			}
+			i=i->next;
+		}
+		ast_pthread_mutex_unlock(&iflock);
+	}
+	/* Never reached */
+	return NULL;
+	
+}
+
+static int restart_monitor(void)
+{
+	pthread_attr_t attr;
+	pthread_attr_init(&attr);
+	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
+	/* If we're supposed to be stopped -- stay stopped */
+	if (monitor_thread == -2)
+		return 0;
+	if (ast_pthread_mutex_lock(&monlock)) {
+		ast_log(LOG_WARNING, "Unable to lock monitor\n");
+		return -1;
+	}
+	if (monitor_thread == pthread_self()) {
+		ast_pthread_mutex_unlock(&monlock);
+		ast_log(LOG_WARNING, "Cannot kill myself\n");
+		return -1;
+	}
+	if (monitor_thread) {
+		pthread_cancel(monitor_thread);
+		pthread_kill(monitor_thread, SIGURG);
+		pthread_join(monitor_thread, NULL);
+	}
+	/* Start a new monitor */
+	if (pthread_create(&monitor_thread, &attr, do_monitor, NULL) < 0) {
+		ast_pthread_mutex_unlock(&monlock);
+		ast_log(LOG_ERROR, "Unable to start monitor thread.\n");
+		return -1;
+	}
+#if 0
+	printf("Created thread %ld detached in restart monitor\n", monitor_thread);
+#endif
+	ast_pthread_mutex_unlock(&monlock);
+	return 0;
+}
+
+static int reset_channel(struct zt_pvt *p)
+{
+	int ioctlflag = 1;
+	int res = 0;
+	int i = 0;
+
+	ast_log(LOG_DEBUG, "reset_channel()\n");
+	if (p->owner) {
+		ioctlflag = 0;
+		p->owner->softhangup = 1;
+	}
+	for (i = 0; i < 3; i++) {
+		if (p->owners[i]) {
+			ioctlflag = 0;
+			p->owners[i]->softhangup = 1;
+		}
+	}
+	if (ioctlflag) {
+		res = zt_set_hook(zap_fd(p->z), ZT_ONHOOK);
+		if (res < 0) {
+			ast_log(LOG_ERROR, "Unable to hangup chan_zap channel %d (ioctl)\n", p->channel);
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+
+static struct zt_pvt *mkintf(int channel, int signalling)
+{
+	/* Make a zt_pvt structure for this interface */
+	struct zt_pvt *tmp = NULL, *tmp2,  *prev = NULL;
+	char fn[80];
+#if 1
+	struct zt_bufferinfo bi;
+#endif	
+	struct zt_spaninfo si;
+	int res;
+	int span;
+	int here = 0;
+	ZT_PARAMS p;
+	
+	tmp2 = iflist;
+	prev = NULL;
+
+	while (tmp2) {
+		if (tmp2->channel == channel) {
+			tmp = tmp2;
+			here = 1;
+			break;
+		}
+		if (tmp2->channel > channel) {
+			break;
+		}
+		prev = tmp2;
+		tmp2 = tmp2->next;
+	}
+
+	if (!here) {
+		tmp = (struct zt_pvt*)malloc(sizeof(struct zt_pvt));
+		if (!tmp) {
+			ast_log(LOG_ERROR, "MALLOC FAILED\n");
+			return NULL;
+		}
+		memset(tmp, 0, sizeof(struct zt_pvt));
+		tmp->next = tmp2;
+		if (!prev) {
+			iflist = tmp;
+		} else {
+			prev->next = tmp;
+		}
+	}
+
+	if (tmp) {
+		snprintf(fn, sizeof(fn), "/dev/zap/%d", channel);
+		/* Open non-blocking */
+		if (!here)
+			tmp->z = zap_open(fn, 1);
+		/* Allocate a zapata structure */
+		if (!tmp->z) {
+			ast_log(LOG_ERROR, "Unable to open channel %d: %s\nhere = %d, tmp->channel = %d, channel = %d\n", channel, strerror(errno), here, tmp->channel, channel);
+			free(tmp);
+			return NULL;
+		}
+		res = ioctl(zap_fd(tmp->z), ZT_GET_PARAMS, &p);
+		if (res < 0) {
+			ast_log(LOG_ERROR, "Unable to get parameters\n");
+			free(tmp);
+			return NULL;
+		}
+		if (p.sigtype != (signalling & 0xffff)) {
+			ast_log(LOG_ERROR, "Signalling requested is %s but line is in %s signalling\n", sig2str(signalling), sig2str(p.sigtype));
+			free(tmp);
+			return NULL;
+		}
+		if (here) {
+			if (tmp->sig != signalling) {
+				if (reset_channel(tmp)) {
+					ast_log(LOG_ERROR, "Failed to reset chan_zap channel %d\n", tmp->channel);
+					return NULL;
+				}
+			}
+		}
+			
+		span = (channel - 1)/24;
+		tmp->span = span + 1;
+#ifdef ZAPATA_PRI
+		if (signalling == SIG_PRI) {
+			int offset;
+			offset = 1;
+			if (ioctl(zap_fd(tmp->z), ZT_AUDIOMODE, &offset)) {
+				ast_log(LOG_ERROR, "Unable to set audio mode on clear channel %d of span %d: %s\n", channel, span, strerror(errno));
+				return NULL;
+			}
+			if (span >= NUM_SPANS) {
+				ast_log(LOG_ERROR, "Channel %d does not lie on a span I know of (%d)\n", channel, span);
+				free(tmp);
+				return NULL;
+			} else {
+				offset = (channel -1) % 24 + 1;
+				if (offset < 24) {
+					if (pris[span].nodetype && (pris[span].nodetype != pritype)) {
+						ast_log(LOG_ERROR, "Span %d is already a %s node\n", span + 1, pri_node2str(pris[span].nodetype));
+						free(tmp);
+						return NULL;
+					}
+					if (pris[span].switchtype && (pris[span].switchtype != switchtype)) {
+						ast_log(LOG_ERROR, "Span %d is already a %s switch\n", span + 1, pri_switch2str(pris[span].switchtype));
+						free(tmp);
+						return NULL;
+					}
+					pris[span].nodetype = pritype;
+					pris[span].switchtype = switchtype;
+					pris[span].chanmask[offset] |= MASK_AVAIL;
+					pris[span].pvt[offset] = tmp;
+					tmp->pri = &pris[span];
+					tmp->call = NULL;
+				} else {
+					ast_log(LOG_ERROR, "Channel 24 is reserved for D-channel.\n");
+					free(tmp);
+					return NULL;
+				}
+			}
+		}
+#endif		
+		/* Adjust starttime on loopstart and kewlstart trunks to reasonable values */
+		if ((signalling == SIG_FXSKS) || (signalling == SIG_FXSLS) ||
+		    (signalling == SIG_EM) || (signalling == SIG_EMWINK)) {
+			p.starttime = 250;
+			res = ioctl(zap_fd(tmp->z), ZT_SET_PARAMS, &p);
+			if (res < 0) {
+				ast_log(LOG_ERROR, "Unable to set parameters\n");
+				free(tmp);
+				return NULL;
+			}
+		}
+#if 0
+		res = fcntl(zap_fd(tmp->z), F_GETFL);
+		if (res >= 0) {
+			res |= O_NONBLOCK;
+			if (fcntl(zap_fd(tmp->z), F_SETFL, res))
+				ast_log(LOG_WARNING, "Unable to set non-blocking mode on channel %d\n", channel);
+		} else
+			ast_log(LOG_WARNING, "Unable to read flags on channel %d\n", channel);
+#endif			
+#if 1
+		if (!here) {
+			res = ioctl(zap_fd(tmp->z), ZT_GET_BUFINFO, &bi);
+			if (!res) {
+				bi.txbufpolicy = ZT_POLICY_IMMEDIATE;
+				bi.rxbufpolicy = ZT_POLICY_IMMEDIATE;
+				bi.numbufs = 4;
+				res = ioctl(zap_fd(tmp->z), ZT_SET_BUFINFO, &bi);
+				if (res < 0) {
+					ast_log(LOG_WARNING, "Unable to set buffer policy on channel %d\n", channel);
+				}
+			} else
+				ast_log(LOG_WARNING, "Unable to check buffer policy on channel %d\n", channel);
+		}
+#endif
+		tmp->immediate = immediate;
+		tmp->sig = signalling;
+		if ((signalling == SIG_FXOKS) || (signalling == SIG_FXOLS) || (signalling == SIG_FXOGS))
+			tmp->permcallwaiting = callwaiting;
+		else
+			tmp->permcallwaiting = 0;
+		/* Flag to destroy the channel must be cleared on new mkif.  Part of changes for reload to work */
+		tmp->destroy = 0;
+		tmp->callwaitingcallerid = callwaitingcallerid;
+		tmp->threewaycalling = threewaycalling;
+		tmp->permhidecallerid = hidecallerid;
+		tmp->echocancel = echocancel;
+		tmp->callwaiting = tmp->permcallwaiting;
+		tmp->hidecallerid = tmp->permhidecallerid;
+		tmp->channel = channel;
+		tmp->stripmsd = stripmsd;
+		tmp->use_callerid = use_callerid;
+		if (!here) {
+			tmp->callwaitindex = -1;
+			tmp->normalindex = -1;
+			tmp->thirdcallindex = -1;
+			tmp->normalindex = -1;
+			tmp->confno = -1;
+			tmp->pseudo = NULL;
+			tmp->pseudochan = 0;
+		}
+		tmp->transfer = transfer;
+		pthread_mutex_init(&tmp->lock, NULL);
+		strncpy(tmp->language, language, sizeof(tmp->language));
+		strncpy(tmp->context, context, sizeof(tmp->context));
+		strncpy(tmp->callerid, callerid, sizeof(tmp->callerid));
+		tmp->group = cur_group;
+		tmp->callgroup=cur_callergroup;
+		tmp->pickupgroup=cur_pickupgroup;
+		tmp->rxgain = rxgain;
+		tmp->txgain = txgain;
+		set_actual_gain(zap_fd(tmp->z), 0, tmp->rxgain, tmp->txgain);
+		zap_digitmode(tmp->z, ZAP_DTMF /* | ZAP_MUTECONF */);
+		conf_clear(tmp);
+		if (!here) {
+			if (signalling != SIG_PRI) 
+				/* Hang it up to be sure it's good */
+				zt_set_hook(zap_fd(tmp->z), ZT_ONHOOK);
+		}
+		tmp->inalarm = 0;
+		si.spanno = 0;
+		if (ioctl(zap_fd(tmp->z),ZT_SPANSTAT,&si) == -1) {
+			ast_log(LOG_ERROR, "Unable to get span status: %s\n", strerror(errno));
+			free(tmp);
+			return NULL;
+		}
+		if (si.alarms) tmp->inalarm = 1;
+	}
+	return tmp;
+}
+
+static inline int available(struct zt_pvt *p, int channelmatch, int groupmatch)
+{
+	/* First, check group matching */
+	if ((p->group & groupmatch) != groupmatch)
+		return 0;
+	/* Check to see if we have a channel match */
+	if ((channelmatch > 0) && (p->channel != channelmatch))
+		return 0;
+		
+	/* If no owner definitely available */
+	if (!p->owner)
+		return 1;
+
+	/* If it's not an FXO, forget about call wait */
+	if ((p->sig != SIG_FXOKS) && (p->sig != SIG_FXOLS) && (p->sig != SIG_FXOGS)) 
+		return 0;
+
+	if (!p->callwaiting) {
+		/* If they don't have call waiting enabled, then for sure they're unavailable at this point */
+		return 0;
+	}
+
+	if (p->callwaitindex > -1) {
+		/* If there is already a call waiting call, then we can't take a second one */
+		return 0;
+	}
+	
+	if ((p->owner->state != AST_STATE_UP) &&
+		(p->owner->state != AST_STATE_RINGING)) {
+		/* If the current call is not up, then don't allow the call */
+		return 0;
+	}
+	if ((p->thirdcallindex > -1) && (p->owner == p->owners[p->thirdcallindex])) {
+		/* Can't take a call wait when the three way calling hasn't been merged yet. */
+		return 0;
+	}
+	/* We're cool */
+	return 1;
+}
+
+static struct ast_channel *zt_request(char *type, int format, void *data)
+{
+	int oldformat;
+	int groupmatch = 0;
+	int channelmatch = -1;
+	struct zt_pvt *p;
+	struct ast_channel *tmp = NULL;
+	char *dest=NULL;
+	int x;
+	char *s;
+	int callwait;
+	
+	/* We do signed linear */
+	oldformat = format;
+	format &= (AST_FORMAT_SLINEAR | AST_FORMAT_ULAW);
+	if (!format) {
+		ast_log(LOG_NOTICE, "Asked to get a channel of unsupported format '%d'\n", oldformat);
+		return NULL;
+	}
+	if (data) {
+		dest = strdup((char *)data);
+	} else {
+		ast_log(LOG_WARNING, "Channel requested with no data\n");
+		return NULL;
+	}
+	if (dest[0] == 'g') {
+		/* Retrieve the group number */
+		s = strtok(dest  + 1, "/");
+		if (sscanf(s, "%d", &x) != 1) {
+			ast_log(LOG_WARNING, "Unable to determine group for data %s\n", (char *)data);
+			free(dest);
+			return NULL;
+		}
+		groupmatch = 1 << x;
+	} else {
+		s = strtok(dest, "/");
+		if (sscanf(s, "%d", &x) != 1) {
+			ast_log(LOG_WARNING, "Unable to determine channel for data %s\n", (char *)data);
+			free(dest);
+			return NULL;
+		}
+		channelmatch = x;
+	}
+	/* Search for an unowned channel */
+	if (ast_pthread_mutex_lock(&iflock)) {
+		ast_log(LOG_ERROR, "Unable to lock interface list???\n");
+		return NULL;
+	}
+	p = iflist;
+	while(p && !tmp) {
+		if (available(p, channelmatch, groupmatch)) {
+			if (option_debug)
+				ast_log(LOG_DEBUG, "Using channel %d\n", p->channel);
+				if (p->inalarm) {
+					p = p->next;
+					continue;
+				}
+#ifdef ZAPATA_PRI
+       	if (p->pri) 
+				if (!(p->call = pri_new_call(p->pri->pri))) {
+					ast_log(LOG_WARNING, "Unable to create call on channel %d\n", p->channel);
+					break;
+				}
+#endif
+			callwait = (p->owner != NULL);
+			tmp = zt_new(p, AST_STATE_RESERVED, 0, p->owner ? 1 : 0, 0);
+			/* Note if the call is a call waiting call */
+			if (callwait)
+				tmp->cdrflags |= AST_CDR_CALLWAIT;
+			break;
+		}
+		p = p->next;
+	}
+	ast_pthread_mutex_unlock(&iflock);
+	restart_monitor();
+	return tmp;
+}
+
+
+static int get_group(char *s)
+{
+	char *copy;
+	char *piece;
+	int start, finish,x;
+	int group = 0;
+	copy = strdup(s);
+	if (!copy) {
+		ast_log(LOG_ERROR, "Out of memory\n");
+		return 0;
+	}
+	piece = strtok(copy, ",");
+	while(piece) {
+		if (sscanf(piece, "%d-%d", &start, &finish) == 2) {
+			/* Range */
+		} else if (sscanf(piece, "%d", &start)) {
+			/* Just one */
+			finish = start;
+		} else {
+			ast_log(LOG_ERROR, "Syntax error parsing '%s' at '%s'.  Using '0'\n", s,piece);
+			return 0;
+		}
+		piece = strtok(NULL, ",");
+		for (x=start;x<=finish;x++) {
+			if ((x > 31) || (x < 0)) {
+				ast_log(LOG_WARNING, "Ignoring invalid group %d\n", x);
+			} else
+				group |= (1 << x);
+		}
+	}
+	free(copy);
+	return group;
+}
+
+#ifdef ZAPATA_PRI
+
+static int pri_find_empty_chan(struct zt_pri *pri)
+{
+	int x;
+	for (x=23;x>0;x--) {
+		if (pri->pvt[x] && !pri->pvt[x]->owner)
+			return x;
+	}
+	return 0;
+}
+
+static int pri_fixup(struct zt_pri *pri, int channel, q931_call *c)
+{
+	int x;
+	for (x=1;x<24;x++) {
+		if (!pri->pvt[x]) continue;
+		if (pri->pvt[x]->call == c) {
+			/* Found our call */
+			if (channel != x) {
+				if (option_verbose > 2)
+					ast_verbose(VERBOSE_PREFIX_3 "Moving call from channel %d to channel %d\n",
+						x, channel);
+				if (pri->pvt[channel]->owner) {
+					ast_log(LOG_WARNING, "Can't fix up channel from %d to %d because %d is already in use\n",
+						x, channel, channel);
+					return 0;
+				}
+				/* Fix it all up now */
+				pri->pvt[channel]->owner = pri->pvt[x]->owner;
+				pri->pvt[channel]->owner->pvt->pvt = pri->pvt[channel];
+				pri->pvt[channel]->owner->fds[0] = zap_fd(pri->pvt[channel]->z);
+				pri->pvt[channel]->call = pri->pvt[x]->call;
+				
+				/* Free up the old channel, now not in use */
+				pri->pvt[x]->owner = NULL;
+				pri->pvt[x]->call = NULL;
+			}
+			return channel;
+		}
+	}
+	return 0;
+}
+
+static void *pri_dchannel(void *vpri)
+{
+	struct zt_pri *pri = vpri;
+	pri_event *e;
+	fd_set efds;
+	fd_set rfds;
+	int res;
+	int chan;
+	int x;
+	struct ast_channel *c;
+	for(;;) {
+		FD_ZERO(&rfds);
+		FD_ZERO(&efds);
+		FD_SET(pri->fd, &rfds);
+		FD_SET(pri->fd, &efds);
+		res = select(pri->fd + 1, &rfds, NULL, &efds, pri_schedule_next(pri->pri));
+		pthread_mutex_lock(&pri->lock);
+		if (!res) {
+			/* Just a timeout, run the scheduler */
+			pri_schedule_run(pri->pri);
+		} else if (res > -1) {
+			e = pri_check_event(pri->pri);
+			if (e) {
+				if (pri->debug)
+					pri_dump_event(pri->pri, e);
+				switch(e->e) {
+				case PRI_EVENT_DCHAN_UP:
+					if (option_verbose > 1) 
+						ast_verbose(VERBOSE_PREFIX_2 "D-Channel on span %d up\n", pri->span);
+					pri->up = 1;
+					break;
+				case PRI_EVENT_DCHAN_DOWN:
+					if (option_verbose > 1) 
+						ast_verbose(VERBOSE_PREFIX_2 "D-Channel on span %d down\n", pri->span);
+					pri->up = 0;
+					break;
+				case PRI_EVENT_RESTART:
+					chan = e->restart.channel;
+					if (chan > -1) {
+						if ((chan < 1) || (chan > 23) )
+							ast_log(LOG_WARNING, "Restart requested on odd channel number %d on span %d\n", chan, pri->span);
+						else if (!pri->pvt[chan])
+							ast_log(LOG_WARNING, "Restart requested on unconfigured channel %d on span %d\n", chan, pri->span);
+						else {
+							if (option_verbose > 2)
+								ast_verbose(VERBOSE_PREFIX_3 "B-channel %d restarted on span %d\n", 
+									chan, pri->span);
+							/* Force soft hangup if appropriate */
+							if (pri->pvt[chan]->owner)
+								pri->pvt[chan]->owner->softhangup = 1;
+						}
+					} else {
+						if (option_verbose > 2)
+							ast_verbose("Restart on requested on entire span %d\n", pri->span);
+						for (x=1;x<24;x++)
+							if (pri->pvt[chan]->owner)
+								pri->pvt[chan]->owner->softhangup = 1;
+					}
+					break;
+				case PRI_EVENT_RING:
+					chan = e->ring.channel;
+					if ((chan < 1) || (chan > 23)) {
+						ast_log(LOG_WARNING, "Ring requested on odd channel number %d span %d\n", chan, pri->span);
+						chan = 0;
+					} else if (!pri->pvt[chan]) {
+						ast_log(LOG_WARNING, "Ring requested on unconfigured channel %d span %d\n", chan, pri->span);
+						chan = 0;
+					} else if (pri->pvt[chan]->owner) {
+						if (pri->pvt[chan]->call == e->ring.call) {
+							ast_log(LOG_WARNING, "Duplicate setup requested on channel %d already in use on span %d\n", chan, pri->span);
+							break;
+						} else {
+							ast_log(LOG_WARNING, "Ring requested on channel %d already in use on span %d\n", chan, pri->span);
+							chan = 0;
+						}
+					}
+					if (!chan && (e->ring.flexible))
+						chan = pri_find_empty_chan(pri);
+					if (chan) {
+						/* Get caller ID */
+						if (pri->pvt[chan]->use_callerid) 
+							strncpy(pri->pvt[chan]->callerid, e->ring.callingnum, sizeof(pri->pvt[chan]->callerid));
+						else
+							strcpy(pri->pvt[chan]->callerid, "");
+						/* Get called number */
+						if (strlen(e->ring.callednum)) {
+							strncpy(pri->pvt[chan]->exten, e->ring.callednum, sizeof(pri->pvt[chan]->exten));
+						} else
+							strcpy(pri->pvt[chan]->exten, "s");
+						/* Make sure extension exists */
+						if (ast_exists_extension(NULL, pri->pvt[chan]->context, pri->pvt[chan]->exten, 1, pri->pvt[chan]->callerid)) {
+							/* Start PBX */
+							pri->pvt[chan]->call = e->ring.call;
+							c = zt_new(pri->pvt[chan], AST_STATE_RING, 1, 0, 0);
+							if (c) {
+								if (option_verbose > 2)
+									ast_verbose(VERBOSE_PREFIX_3 "Accepting call from '%s' to '%s' on channel %d, span %d\n",
+										e->ring.callingnum, pri->pvt[chan]->exten, chan, pri->span);
+								pri_acknowledge(pri->pri, e->ring.call, chan, 0);
+								zt_enable_ec(pri->pvt[chan]);
+							} else {
+								ast_log(LOG_WARNING, "Unable to start PBX on channel %d, span %d\n", chan, pri->span);
+								pri_release(pri->pri, e->ring.call, PRI_CAUSE_SWITCH_CONGESTION);
+								pri->pvt[chan]->call = 0;
+							}
+						} else {
+							if (option_verbose > 2) 
+								ast_verbose(VERBOSE_PREFIX_3 "Extension '%s' in context '%s' does not exist.  Rejecting call on channel %d, span %d\n", 
+									pri->pvt[chan]->exten, pri->pvt[chan]->context, chan, pri->span);
+							pri_release(pri->pri, e->ring.call, PRI_CAUSE_UNALLOCATED);
+						}
+					} else 
+						pri_release(pri->pri, e->ring.call, PRI_CAUSE_REQUESTED_CHAN_UNAVAIL);
+					break;
+				case PRI_EVENT_RINGING:
+					chan = e->ringing.channel;
+					if ((chan < 1) || (chan > 23)) {
+						ast_log(LOG_WARNING, "Ringing requested on odd channel number %d span %d\n", chan, pri->span);
+						chan = 0;
+					} else if (!pri->pvt[chan]) {
+						ast_log(LOG_WARNING, "Ringing requested on unconfigured channel %d span %d\n", chan, pri->span);
+						chan = 0;
+					}
+					if (chan) {
+						chan = pri_fixup(pri, chan, e->ringing.call);
+						if (!chan) {
+							ast_log(LOG_WARNING, "Ringing requested on channel %d not in use on span %d\n", e->ringing.channel, pri->span);
+							chan = 0;
+						} else
+							pri->pvt[chan]->needringing[0] =1;
+					}
+					zt_enable_ec(pri->pvt[chan]);
+					break;				
+				case PRI_EVENT_ANSWER:
+					chan = e->answer.channel;
+					if ((chan < 1) || (chan > 23)) {
+						ast_log(LOG_WARNING, "Answer on odd channel number %d span %d\n", chan, pri->span);
+						chan = 0;
+					} else if (!pri->pvt[chan]) {
+						ast_log(LOG_WARNING, "Answer on unconfigured channel %d span %d\n", chan, pri->span);
+						chan = 0;
+					}
+					if (chan) {
+						chan = pri_fixup(pri, chan, e->ringing.call);
+						if (!chan) {
+							ast_log(LOG_WARNING, "Ring requested on channel %d not in use on span %d\n", chan, pri->span);
+							chan = 0;
+						} else
+							pri->pvt[chan]->needanswer[0] =1;
+					}
+					break;				
+				case PRI_EVENT_HANGUP:
+					chan = e->hangup.channel;
+					if ((chan < 1) || (chan > 23)) {
+						ast_log(LOG_WARNING, "Hangup requested on odd channel number %d span %d\n", chan, pri->span);
+						chan = 0;
+					} else if (!pri->pvt[chan]) {
+						ast_log(LOG_WARNING, "Hanngup requested on unconfigured channel %d span %d\n", chan, pri->span);
+						chan = 0;
+					}
+					if (chan) {
+						chan = pri_fixup(pri, chan, e->hangup.call);
+						if (chan) {
+							if (pri->pvt[chan]->owner) {
+								if (option_verbose > 3) 
+									ast_verbose(VERBOSE_PREFIX_3, "Channel %d, span %d got hangup\n", chan, pri->span);
+								pri->pvt[chan]->owner->softhangup = 1;
+							}
+						}
+					}
+					break;
+				case PRI_EVENT_HANGUP_ACK:
+					chan = e->hangup.channel;
+					if ((chan < 1) || (chan > 23)) {
+						ast_log(LOG_WARNING, "Hangup ACK requested on odd channel number %d span %d\n", chan, pri->span);
+						chan = 0;
+					} else if (!pri->pvt[chan]) {
+						ast_log(LOG_WARNING, "Hanngup ACK requested on unconfigured channel %d span %d\n", chan, pri->span);
+						chan = 0;
+					}
+					if (chan) {
+						chan = pri_fixup(pri, chan, e->hangup.call);
+						if (chan) {
+							if (pri->pvt[chan]->owner) {
+								if (option_verbose > 3) 
+									ast_verbose(VERBOSE_PREFIX_3, "Channel %d, span %d got hangup ACK\n", chan, pri->span);
+								pri->pvt[chan]->call = NULL;
+							}
+						}
+					}
+					break;
+				case PRI_EVENT_CONFIG_ERR:
+					ast_log(LOG_WARNING, "PRI Error: %s\n", e->err.err);
+					break;
+				default:
+					ast_log(LOG_DEBUG, "Event: %d\n", e->e);
+				}
+			} else {
+				/* Check for an event */
+				x = 0;
+				res = ioctl(pri->fd, ZT_GETEVENT, &x);
+				if (x) 
+					printf("PRI got event: %d\n", x);
+				if (option_debug)
+					ast_log(LOG_DEBUG, "Got event %s (%d) on D-channel for span %d\n", event2str(x), x, pri->span);
+			}
+		} else {
+			if (errno != EINTR) 
+				ast_log(LOG_WARNING, "pri_event returned error %d (%s)\n", errno, strerror(errno));
+		}
+		pthread_mutex_unlock(&pri->lock);
+	}
+	/* Never reached */
+	return NULL;
+}
+
+static int start_pri(struct zt_pri *pri)
+{
+	char filename[80];
+	int res;
+	ZT_PARAMS p;
+	ZT_BUFFERINFO bi;
+	snprintf(filename, sizeof(filename), "/dev/zap/%d", pri->offset + 24);
+	pri->fd = open(filename, O_RDWR, 0600);
+	if (pri->fd < 0) {
+		ast_log(LOG_ERROR, "Unable to open D-channel %s (%s)\n", filename, strerror(errno));
+		return -1;
+	}
+	res = ioctl(pri->fd, ZT_GET_PARAMS, &p);
+	if (res) {
+		close(pri->fd);
+		pri->fd = -1;
+		ast_log(LOG_ERROR, "Unable to get parameters for D-channel %s (%s)\n", filename, strerror(errno));
+		return -1;
+	}
+	if (p.sigtype != ZT_SIG_HDLCFCS) {
+		close(pri->fd);
+		pri->fd = -1;
+		ast_log(LOG_ERROR, "D-channel %s is not in HDLC/FCS mode.  See /etc/tormenta.conf\n", filename);
+		return -1;
+	}
+	bi.txbufpolicy = ZT_POLICY_IMMEDIATE;
+	bi.rxbufpolicy = ZT_POLICY_IMMEDIATE;
+	bi.numbufs = 4;
+	bi.bufsize = 1024;
+	if (ioctl(pri->fd, ZT_SET_BUFINFO, &bi)) {
+		ast_log(LOG_ERROR, "Unable to set appropriate buffering on %s\n", filename);
+		close(pri->fd);
+		pri->fd = -1;
+		return -1;
+	}
+	pri->pri = pri_new(pri->fd, pri->nodetype, pri->switchtype);
+	if (!pri->pri) {
+		close(pri->fd);
+		pri->fd = -1;
+		ast_log(LOG_ERROR, "Unable to create PRI structure\n");
+		return -1;
+	}
+	pri_set_debug(pri->pri, DEFAULT_PRI_DEBUG);
+	if (pthread_create(&pri->master, NULL, pri_dchannel, pri)) {
+		close(pri->fd);
+		pri->fd = -1;
+		ast_log(LOG_ERROR, "Unable to spawn D-channel: %s\n", strerror(errno));
+		return -1;
+	}
+	return 0;
+}
+
+static char *complete_span(char *line, char *word, int pos, int state)
+{
+	int span=1;
+	char tmp[50];
+	while(span <= NUM_SPANS) {
+		if (span > state)
+			break;
+		span++;
+	}
+	if (span <= NUM_SPANS) {
+		snprintf(tmp, sizeof(tmp), "%d", span);
+		return strdup(tmp);
+	} else
+		return NULL;
+}
+
+static int handle_pri_debug(int fd, int argc, char *argv[])
+{
+	int span;
+	span = atoi(argv[3]);
+	if ((span < 1) || (span > NUM_SPANS)) {
+		ast_cli(fd, "Invalid span %s.  Should be a number %d to %d\n", argv[3], 1, NUM_SPANS);
+		return RESULT_SUCCESS;
+	}
+	if (!pris[span-1].pri) {
+		ast_cli(fd, "No PRI running on span %d\n", span);
+		return RESULT_SUCCESS;
+	}
+	pri_set_debug(pris[span-1].pri, PRI_DEBUG_Q931_DUMP | PRI_DEBUG_Q931_STATE);
+	ast_cli(fd, "Enabled debugging on span %d\n", span);
+	return RESULT_SUCCESS;
+}
+
+static int handle_pri_no_debug(int fd, int argc, char *argv[])
+{
+	int span;
+	span = atoi(argv[4]);
+	if ((span < 1) || (span > NUM_SPANS)) {
+		ast_cli(fd, "Invalid span %s.  Should be a number %d to %d\n", argv[4], 1, NUM_SPANS);
+		return RESULT_SUCCESS;
+	}
+	if (!pris[span-1].pri) {
+		ast_cli(fd, "No PRI running on span %d\n", span);
+		return RESULT_SUCCESS;
+	}
+	pri_set_debug(pris[span-1].pri, 0);
+	ast_cli(fd, "Disabled debugging on span %d\n", span);
+	return RESULT_SUCCESS;
+}
+
+static char pri_debug_help[] = 
+	"Usage: pri debug span <span>\n"
+	"       Enables debugging on a given PRI span\n";
+	
+static char pri_no_debug_help[] = 
+	"Usage: pri no debug span <span>\n"
+	"       Disables debugging on a given PRI span\n";
+
+#if 0
+static struct ast_cli_entry cli_show_channel = {
+	{"zap", "show", "channel", NULL}, zap_show_channel, "Show the detailed status of a single zapata channel", show_channel_usage
+};
+#endif
+
+static struct ast_cli_entry pri_debug = {
+	{ "pri", "debug", "span", NULL }, handle_pri_debug, "Enables PRI debugging on a span", pri_debug_help, complete_span 
+};
+
+static struct ast_cli_entry pri_no_debug = {
+	{ "pri", "no", "debug", "span", NULL }, handle_pri_no_debug, "Enables PRI debugging on a span", pri_no_debug_help, complete_span };
+
+#endif /* ZAPATA_PRI */
+
+
+static int zap_destroy_channel(int fd, int argc, char **argv)
+{
+	int channel = 0;
+	struct zt_pvt *tmp = NULL;
+	struct zt_pvt *prev = NULL;
+	
+	if (argc != 4) {
+		return RESULT_SHOWUSAGE;
+	}
+	channel = atoi(argv[3]);
+
+	tmp = iflist;
+	while (tmp) {
+		if (tmp->channel == channel) {
+			destroy_channel(prev, tmp, 1);
+			return RESULT_SUCCESS;
+		}
+		prev = tmp;
+		tmp = tmp->next;
+	}
+	return RESULT_FAILURE;
+}
+
+static int zap_show_channels(int fd, int argc, char **argv)
+{
+#define FORMAT "%3d %-10.10s %-10.10s %-10.10s\n"
+#define FORMAT2 "%3s %-10.10s %-10.10s %-10.10s\n"
+	struct zt_pvt *tmp = NULL;
+
+	if (argc != 3)
+		return RESULT_SHOWUSAGE;
+
+	ast_pthread_mutex_lock(&iflock);
+	ast_cli(fd, FORMAT2, "Chan. Num.", "Extension", "Context", "Language");
+	
+	tmp = iflist;
+	while (tmp) {
+		ast_cli(fd, FORMAT, tmp->channel, tmp->exten, tmp->context, tmp->language);
+		tmp = tmp->next;
+	}
+	ast_pthread_mutex_unlock(&iflock);
+	return RESULT_SUCCESS;
+#undef FORMAT
+#undef FORMAT2
+}
+
+static int zap_show_channel(int fd, int argc, char **argv)
+{
+	int channel;
+	struct zt_pvt *tmp = NULL;
+
+	if (argc != 4)
+		return RESULT_SHOWUSAGE;
+	channel = atoi(argv[3]);
+
+	ast_pthread_mutex_lock(&iflock);
+	tmp = iflist;
+	while (tmp) {
+		if (tmp->channel == channel) {
+			ast_cli(fd, "Channel: %d\n", tmp->channel);
+			ast_cli(fd, "Span: %d\n", tmp->span);
+			ast_cli(fd, "Extension: %s\n", tmp->exten);
+			ast_cli(fd, "Context: %s\n", tmp->context);
+			ast_cli(fd, "Caller ID string: %s\n", tmp->callerid);
+			ast_cli(fd, "Destroy: %d\n", tmp->destroy);
+			ast_cli(fd, "Signalling Type: %s\n", sig2str(tmp->sig));
+			ast_pthread_mutex_unlock(&iflock);
+			return RESULT_SUCCESS;
+		}
+		tmp = tmp->next;
+	}
+	
+	ast_cli(fd, "Unable to find given channel %d\n", channel);
+	ast_pthread_mutex_unlock(&iflock);
+	return RESULT_FAILURE;
+}
+
+			
+
+static char show_channels_usage[] =
+	"Usage: zap show channels\n"
+	"	Shows a list of available channels\n";
+
+static char show_channel_usage[] =
+	"Usage: zap show channel <chan num>\n"
+	"	Detailed information about a given channel\n";
+static char destroy_channel_usage[] =
+	"Usage: zap destroy channel <chan num>\n"
+	"	DON'T USE THIS UNLESS YOU KNOW WHAT YOU ARE DOING.  Immediately removes a given channel, whether it is in use or not\n";
+
+static struct ast_cli_entry cli_show_channels = { 
+	{"zap", "show", "channels", NULL}, zap_show_channels, "Show active zapata channels", show_channels_usage, NULL };
+
+static struct ast_cli_entry cli_show_channel = { 
+	{"zap", "show", "channel", NULL}, zap_show_channel, "Show information on a channel", show_channel_usage, NULL };
+
+static struct ast_cli_entry cli_destroy_channel = { 
+	{"zap", "destroy", "channel", NULL}, zap_destroy_channel, "Destroy a channel", destroy_channel_usage, NULL };
+
+int load_module()
+{
+	struct ast_config *cfg;
+	struct ast_variable *v;
+	struct zt_pvt *tmp;
+	char *chan;
+	int start, finish,x;
+#ifdef ZAPATA_PRI
+	int y;
+#endif
+
+#ifdef ZAPATA_PRI
+	memset(pris, 0, sizeof(pris));
+	for (y=0;y<NUM_SPANS;y++)
+		pris[y].fd = -1;
+#endif
+	
+	cfg = ast_load(config);
+
+	/* We *must* have a config file otherwise stop immediately */
+	if (!cfg) {
+		ast_log(LOG_ERROR, "Unable to load config %s\n", config);
+		return -1;
+	}
+	
+
+	if (ast_pthread_mutex_lock(&iflock)) {
+		/* It's a little silly to lock it, but we mind as well just to be sure */
+		ast_log(LOG_ERROR, "Unable to lock interface list???\n");
+		return -1;
+	}
+	v = ast_variable_browse(cfg, "channels");
+	while(v) {
+		/* Create the interface list */
+		if (!strcasecmp(v->name, "channel")) {
+			if (cur_signalling < 0) {
+				ast_log(LOG_ERROR, "Signalling must be specified before any channels are.\n");
+				ast_destroy(cfg);
+				ast_pthread_mutex_unlock(&iflock);
+				unload_module();
+				return -1;
+			}
+			chan = strtok(v->value, ",");
+			while(chan) {
+				if (sscanf(chan, "%d-%d", &start, &finish) == 2) {
+					/* Range */
+				} else if (sscanf(chan, "%d", &start)) {
+					/* Just one */
+					finish = start;
+				} else {
+					ast_log(LOG_ERROR, "Syntax error parsing '%s' at '%s'\n", v->value, chan);
+					ast_destroy(cfg);
+					ast_pthread_mutex_unlock(&iflock);
+					unload_module();
+					return -1;
+				}
+				if (finish < start) {
+					ast_log(LOG_WARNING, "Sillyness: %d < %d\n", start, finish);
+					x = finish;
+					finish = start;
+					start = x;
+				}
+				for (x=start;x<=finish;x++) {
+					tmp = mkintf(x, cur_signalling);
+					if (tmp) {
+						if (option_verbose > 2)
+							ast_verbose(VERBOSE_PREFIX_3 "Registered channel %d, %s signalling\n", x, sig2str(tmp->sig));
+					} else {
+						ast_log(LOG_ERROR, "Unable to register channel '%s'\n", v->value);
+						ast_destroy(cfg);
+						ast_pthread_mutex_unlock(&iflock);
+						unload_module();
+						return -1;
+					}
+				}
+				chan = strtok(NULL, ",");
+			}
+		} else if (!strcasecmp(v->name, "usecallerid")) {
+			use_callerid = ast_true(v->value);
+		} else if (!strcasecmp(v->name, "threewaycalling")) {
+			threewaycalling = ast_true(v->value);
+		} else if (!strcasecmp(v->name, "transfer")) {
+			transfer = ast_true(v->value);
+		} else if (!strcasecmp(v->name, "echocancel")) {
+			echocancel = ast_true(v->value);
+		} else if (!strcasecmp(v->name, "hidecallerid")) {
+			hidecallerid = ast_true(v->value);
+		} else if (!strcasecmp(v->name, "callwaiting")) {
+			callwaiting = ast_true(v->value);
+		} else if (!strcasecmp(v->name, "callwaitingcallerid")) {
+			callwaitingcallerid = ast_true(v->value);
+		} else if (!strcasecmp(v->name, "context")) {
+			strncpy(context, v->value, sizeof(context));
+		} else if (!strcasecmp(v->name, "language")) {
+			strncpy(language, v->value, sizeof(language));
+		} else if (!strcasecmp(v->name, "stripmsd")) {
+			stripmsd = atoi(v->value);
+		} else if (!strcasecmp(v->name, "group")) {
+			cur_group = get_group(v->value);
+		} else if (!strcasecmp(v->name, "callgroup")) {
+			cur_callergroup = get_group(v->value);
+		} else if (!strcasecmp(v->name, "pickupgroup")) {
+			cur_pickupgroup = get_group(v->value);
+		} else if (!strcasecmp(v->name, "immediate")) {
+			immediate = ast_true(v->value);
+		} else if (!strcasecmp(v->name, "rxgain")) {
+			if (sscanf(v->value, "%f", &rxgain) != 1) {
+				ast_log(LOG_WARNING, "Invalid rxgain: %s\n", v->value);
+			}
+		} else if (!strcasecmp(v->name, "txgain")) {
+			if (sscanf(v->value, "%f", &txgain) != 1) {
+				ast_log(LOG_WARNING, "Invalid txgain: %s\n", v->value);
+			}
+		} else if (!strcasecmp(v->name, "callerid")) {
+			if (!strcasecmp(v->value, "asreceived"))
+				strcpy(callerid,"");
+			else
+				strncpy(callerid, v->value, sizeof(callerid));
+		} else if (!strcasecmp(v->name, "signalling")) {
+			if (!strcasecmp(v->value, "em")) {
+				cur_signalling = SIG_EM;
+			} else if (!strcasecmp(v->value, "em_w")) {
+				cur_signalling = SIG_EMWINK;
+			} else if (!strcasecmp(v->value, "fxs_ls")) {
+				cur_signalling = SIG_FXSLS;
+			} else if (!strcasecmp(v->value, "fxs_gs")) {
+				cur_signalling = SIG_FXSGS;
+			} else if (!strcasecmp(v->value, "fxs_ks")) {
+				cur_signalling = SIG_FXSKS;
+			} else if (!strcasecmp(v->value, "fxo_ls")) {
+				cur_signalling = SIG_FXOLS;
+			} else if (!strcasecmp(v->value, "fxo_gs")) {
+				cur_signalling = SIG_FXOGS;
+			} else if (!strcasecmp(v->value, "fxo_ks")) {
+				cur_signalling = SIG_FXOKS;
+			} else if (!strcasecmp(v->value, "featd")) {
+				cur_signalling = SIG_FEATD;
+#ifdef ZAPATA_PRI
+			} else if (!strcasecmp(v->value, "pri_net")) {
+				cur_signalling = SIG_PRI;
+				pritype = PRI_NETWORK;
+			} else if (!strcasecmp(v->value, "pri_cpe")) {
+				cur_signalling = SIG_PRI;
+				pritype = PRI_CPE;
+#endif
+			} else {
+				ast_log(LOG_ERROR, "Unknown signalling method '%s'\n", v->value);
+			}
+#ifdef ZAPATA_PRI
+		} else if (!strcasecmp(v->name, "switchtype")) {
+			if (!strcasecmp(v->value, "national")) 
+				switchtype = PRI_SWITCH_NI2;
+			else if (!strcasecmp(v->value, "dms100"))
+				switchtype = PRI_SWITCH_DMS100;
+			else if (!strcasecmp(v->value, "4ess"))
+				switchtype = PRI_SWITCH_ATT4ESS;
+			else if (!strcasecmp(v->value, "5ess"))
+				switchtype = PRI_SWITCH_LUCENT5E;
+			else {
+				ast_log(LOG_ERROR, "Unknown switchtype '%s'\n", v->value);
+				ast_destroy(cfg);
+				ast_pthread_mutex_unlock(&iflock);
+				unload_module();
+				return -1;
+			}
+#endif		
+		} else
+			ast_log(LOG_DEBUG, "Ignoring %s\n", v->name);
+		v = v->next;
+	}
+	ast_pthread_mutex_unlock(&iflock);
+	/* Make sure we can register our Zap channel type */
+	if (ast_channel_register(type, tdesc, AST_FORMAT_SLINEAR |  AST_FORMAT_ULAW, zt_request)) {
+		ast_log(LOG_ERROR, "Unable to register channel class %s\n", type);
+		ast_destroy(cfg);
+		unload_module();
+		return -1;
+	}
+	if (ast_channel_register(typecompat, tdesc, AST_FORMAT_SLINEAR |  AST_FORMAT_ULAW, zt_request)) {
+		ast_log(LOG_ERROR, "Unable to register channel class %s\n", typecompat);
+		ast_destroy(cfg);
+		unload_module();
+		return -1;
+	}
+	ast_destroy(cfg);
+#ifdef ZAPATA_PRI
+	for (x=0;x<NUM_SPANS;x++) {
+		for (y=1;y<23;y++) {
+			if (pris[x].chanmask[y]) {
+				pris[x].offset = x * 24;
+				pris[x].span = x + 1;
+				if (start_pri(pris + x)) {
+					ast_log(LOG_ERROR, "Unable to start D-channel on span %d\n", x + 1);
+					return -1;
+				} else if (option_verbose > 1) 
+					ast_verbose(VERBOSE_PREFIX_2 "Starting D-Channel on span %d\n", x + 1);
+				break;
+			}
+		}
+	}
+	ast_cli_register(&pri_debug);
+	ast_cli_register(&pri_no_debug);
+#endif	
+	ast_cli_register(&cli_show_channels);
+	ast_cli_register(&cli_show_channel);
+	ast_cli_register(&cli_destroy_channel);
+	/* And start the monitor for the first time */
+	restart_monitor();
+	return 0;
+}
+
+int unload_module()
+{
+	struct zt_pvt *p, *pl;
+	/* First, take us out of the channel loop */
+	ast_channel_unregister(type);
+	ast_channel_unregister(typecompat);
+	ast_cli_unregister(&cli_show_channels);
+	ast_cli_unregister(&cli_show_channel);
+	ast_cli_unregister(&cli_destroy_channel);
+	if (!ast_pthread_mutex_lock(&iflock)) {
+		/* Hangup all interfaces if they have an owner */
+		p = iflist;
+		while(p) {
+			if (p->owner)
+				ast_softhangup(p->owner);
+			p = p->next;
+		}
+		iflist = NULL;
+		ast_pthread_mutex_unlock(&iflock);
+	} else {
+		ast_log(LOG_WARNING, "Unable to lock the monitor\n");
+		return -1;
+	}
+	if (!ast_pthread_mutex_lock(&monlock)) {
+		if (monitor_thread) {
+			pthread_cancel(monitor_thread);
+			pthread_kill(monitor_thread, SIGURG);
+			pthread_join(monitor_thread, NULL);
+		}
+		monitor_thread = -2;
+		ast_pthread_mutex_unlock(&monlock);
+	} else {
+		ast_log(LOG_WARNING, "Unable to lock the monitor\n");
+		return -1;
+	}
+
+	if (!ast_pthread_mutex_lock(&iflock)) {
+		/* Destroy all the interfaces and free their memory */
+		p = iflist;
+		while(p) {
+			/* Free any callerid */
+			if (p->cidspill)
+				free(p->cidspill);
+			/* Close the zapata thingy */
+			if (p->z)
+				zap_close(p->z);
+			pl = p;
+			p = p->next;
+			/* Free associated memory */
+			free(pl);
+		}
+		iflist = NULL;
+		ast_pthread_mutex_unlock(&iflock);
+	} else {
+		ast_log(LOG_WARNING, "Unable to lock the monitor\n");
+		return -1;
+	}
+		
+	return 0;
+}
+
+static int reload_zt(void)
+{
+	struct ast_config *cfg;
+	struct ast_variable *v;
+	struct zt_pvt *tmp;
+	struct zt_pvt *prev = NULL;
+	char *chan;
+	int start, finish,x;
+
+	/* Some crap that needs to be reinitialized on the reload */
+	strcpy(context, "default");
+	language[0] = '\0'; 
+	use_callerid = 1;
+	cur_signalling = -1;
+	cur_group = 0;
+	cur_callergroup = 0;
+	cur_pickupgroup = 0;
+	immediate = 0;
+	stripmsd = 0;
+	callwaiting = 0;
+	callwaitingcallerid = 0;
+	hidecallerid = 0;
+	threewaycalling = 0;
+	transfer = 0;
+	rxgain = 0.0;
+	txgain = 0.0;
+	firstdigittimeout = 16000;
+	gendigittimeout = 8000;
+//	usecnt = 0;
+
+#if 0
+#ifdef ZAPATA_PRI
+	int y;
+#endif
+#endif
+
+	
+#if 0
+#ifdef ZAPATA_PRI
+	memset(pris, 0, sizeof(pris));
+	for (y=0;y<NUM_SPANS;y++)
+		pris[y].fd = -1;
+#endif
+#endif /* 0 */
+	
+	cfg = ast_load(config);
+
+	/* We *must* have a config file otherwise stop immediately */
+	if (!cfg) {
+		ast_log(LOG_ERROR, "Unable to load config %s\n", config);
+		return -1;
+	}
+	
+
+	if (ast_pthread_mutex_lock(&iflock)) {
+		/* It's a little silly to lock it, but we mind as well just to be sure */
+		ast_log(LOG_ERROR, "Unable to lock interface list???\n");
+		return -1;
+	}
+	
+	/* Part of the primary changes for the reload... */
+	tmp = iflist;
+	
+	while (tmp) {
+		tmp->destroy = 1;
+		tmp = tmp->next;
+	}
+
+	v = ast_variable_browse(cfg, "channels");
+	
+	while(v) {
+		/* Create the interface list */
+		if (!strcasecmp(v->name, "channel")) {
+			if (cur_signalling < 0) {
+				ast_log(LOG_ERROR, "Signalling must be specified before any channels are.\n");
+				ast_destroy(cfg);
+				ast_pthread_mutex_unlock(&iflock);
+				return -1;
+			}
+			chan = strtok(v->value, ",");
+			while(chan) {
+				if (sscanf(chan, "%d-%d", &start, &finish) == 2) {
+					/* Range */
+				} else if (sscanf(chan, "%d", &start)) {
+					/* Just one */
+					finish = start;
+				} else {
+					ast_log(LOG_ERROR, "Syntax error parsing '%s' at '%s'\n", v->value, chan);
+					ast_destroy(cfg);
+					ast_pthread_mutex_unlock(&iflock);
+					return -1;
+				}
+				if (finish < start) {
+					ast_log(LOG_WARNING, "Sillyness: %d < %d\n", start, finish);
+					x = finish;
+					finish = start;
+					start = x;
+				}
+				for (x = start; x <= finish; x++) {
+					tmp = mkintf(x, cur_signalling);
+					if (tmp) {
+						if (option_verbose > 2)
+							ast_verbose(VERBOSE_PREFIX_3 "Registered channel %d, %s signalling\n", x, sig2str(tmp->sig));
+					} else {
+						ast_log(LOG_ERROR, "Unable to register channel '%s'\n", v->value);
+						ast_destroy(cfg);
+						ast_pthread_mutex_unlock(&iflock);
+						return -1;
+					}
+				}
+				chan = strtok(NULL, ",");
+			}
+		} else if (!strcasecmp(v->name, "usecallerid")) {
+			use_callerid = ast_true(v->value);
+		} else if (!strcasecmp(v->name, "threewaycalling")) {
+			threewaycalling = ast_true(v->value);
+		} else if (!strcasecmp(v->name, "transfer")) {
+			transfer = ast_true(v->value);
+		} else if (!strcasecmp(v->name, "echocancel")) {
+			echocancel = ast_true(v->value);
+		} else if (!strcasecmp(v->name, "hidecallerid")) {
+			hidecallerid = ast_true(v->value);
+		} else if (!strcasecmp(v->name, "callwaiting")) {
+			callwaiting = ast_true(v->value);
+		} else if (!strcasecmp(v->name, "callwaitingcallerid")) {
+			callwaitingcallerid = ast_true(v->value);
+		} else if (!strcasecmp(v->name, "context")) {
+			strncpy(context, v->value, sizeof(context));
+		} else if (!strcasecmp(v->name, "language")) {
+			strncpy(language, v->value, sizeof(language));
+		} else if (!strcasecmp(v->name, "stripmsd")) {
+			stripmsd = atoi(v->value);
+		} else if (!strcasecmp(v->name, "group")) {
+			cur_group = get_group(v->value);
+		} else if (!strcasecmp(v->name, "callgroup")) {
+			cur_callergroup = get_group(v->value);
+		} else if (!strcasecmp(v->name, "pickupgroup")) {
+			cur_pickupgroup = get_group(v->value);
+		} else if (!strcasecmp(v->name, "immediate")) {
+			immediate = ast_true(v->value);
+		} else if (!strcasecmp(v->name, "rxgain")) {
+			if (sscanf(v->value, "%f", &rxgain) != 1) {
+				ast_log(LOG_WARNING, "Invalid rxgain: %s\n", v->value);
+			}
+		} else if (!strcasecmp(v->name, "txgain")) {
+			if (sscanf(v->value, "%f", &txgain) != 1) {
+				ast_log(LOG_WARNING, "Invalid txgain: %s\n", v->value);
+			}
+		} else if (!strcasecmp(v->name, "callerid")) {
+			if (!strcasecmp(v->value, "asreceived"))
+				strcpy(callerid,"");
+			else
+				strncpy(callerid, v->value, sizeof(callerid));
+		} else if (!strcasecmp(v->name, "signalling")) {
+			if (!strcasecmp(v->value, "em")) {
+				cur_signalling = SIG_EM;
+			} else if (!strcasecmp(v->value, "em_w")) {
+				cur_signalling = SIG_EMWINK;
+			} else if (!strcasecmp(v->value, "fxs_ls")) {
+				cur_signalling = SIG_FXSLS;
+			} else if (!strcasecmp(v->value, "fxs_gs")) {
+				cur_signalling = SIG_FXSGS;
+			} else if (!strcasecmp(v->value, "fxs_ks")) {
+				cur_signalling = SIG_FXSKS;
+			} else if (!strcasecmp(v->value, "fxo_ls")) {
+				cur_signalling = SIG_FXOLS;
+			} else if (!strcasecmp(v->value, "fxo_gs")) {
+				cur_signalling = SIG_FXOGS;
+			} else if (!strcasecmp(v->value, "fxo_ks")) {
+				cur_signalling = SIG_FXOKS;
+			} else if (!strcasecmp(v->value, "featd")) {
+				cur_signalling = SIG_FEATD;
+#ifdef ZAPATA_PRI
+			} else if (!strcasecmp(v->value, "pri_net")) {
+				cur_signalling = SIG_PRI;
+				pritype = PRI_NETWORK;
+			} else if (!strcasecmp(v->value, "pri_cpe")) {
+				cur_signalling = SIG_PRI;
+				pritype = PRI_CPE;
+#endif
+			} else {
+				ast_log(LOG_ERROR, "Unknown signalling method '%s'\n", v->value);
+			}
+#ifdef ZAPATA_PRI
+		} else if (!strcasecmp(v->name, "switchtype")) {
+			if (!strcasecmp(v->value, "national")) 
+				switchtype = PRI_SWITCH_NI2;
+			else if (!strcasecmp(v->value, "dms100"))
+				switchtype = PRI_SWITCH_DMS100;
+			else if (!strcasecmp(v->value, "4ess"))
+				switchtype = PRI_SWITCH_ATT4ESS;
+			else if (!strcasecmp(v->value, "5ess"))
+				switchtype = PRI_SWITCH_LUCENT5E;
+			else {
+				ast_log(LOG_ERROR, "Unknown switchtype '%s'\n", v->value);
+				ast_destroy(cfg);
+				ast_pthread_mutex_unlock(&iflock);
+				return -1;
+			}
+#endif		
+		} else
+			ast_log(LOG_DEBUG, "Ignoring %s\n", v->name);
+		v = v->next;
+	}
+
+	tmp = iflist;
+	prev = NULL;
+
+	while (tmp) {
+		if (tmp->destroy) {
+			if (destroy_channel(prev, tmp, 0)) {
+				ast_log(LOG_ERROR, "Unable to destroy chan_zap channel %d\n", tmp->channel);
+				ast_pthread_mutex_unlock(&iflock);
+				return -1;
+			}
+			tmp = tmp->next;
+		} else {
+			prev = tmp;
+			tmp = tmp->next;
+		}
+	}
+
+	ast_pthread_mutex_unlock(&iflock);
+
+	ast_destroy(cfg);
+#if 0
+#ifdef ZAPATA_PRI
+	for (x=0;x<NUM_SPANS;x++) {
+		for (y=1;y<23;y++) {
+			if (pris[x].chanmask[y]) {
+				pris[x].offset = x * 24;
+				pris[x].span = x + 1;
+				if (start_pri(pris + x)) {
+					ast_log(LOG_ERROR, "Unable to start D-channel on span %d\n", x + 1);
+					return -1;
+				} else if (option_verbose > 1) 
+					ast_verbose(VERBOSE_PREFIX_2 "Starting D-Channel on span %d\n", x + 1);
+				break;
+			}
+		}
+	}
+#endif
+#endif
+	/* And start the monitor for the first time */
+
+	restart_monitor();
+	return 0;
+}
+
+#if 0
+/* XXX Very broken on PRI XXX */
+int reload(void)
+{
+	if (reload_zt()) {
+		ast_log(LOG_WARNING, "Reload of chan_zap is unsuccessful\n");
+		return -1;
+	}
+
+	return 0;
+}
+#endif
+int usecount()
+{
+	int res;
+	ast_pthread_mutex_lock(&usecnt_lock);
+	res = usecnt;
+	ast_pthread_mutex_unlock(&usecnt_lock);
+	return res;
+}
+
+char *description()
+{
+	return desc;
+}
+
+char *key()
+{
+	return ASTERISK_GPL_KEY;
+}