issue #3360 plus related fix

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@7037 65c4cc65-6c06-0410-ace0-fbb531ad65f3

ChangeLog

@@ -1,5 +1,8 @@
 2005-11-08  Kevin P. Fleming  <kpfleming@digium.com>
 
+	* channels/chan_zap.c (zt_request): return AST_CAUSE_CONGESTION when a group-channel is requested and the group exists but all channels are busy (issue #3360, related fix)
+	* channels/chan_iax2.c (create_addr): treat UNREACHABLE as AST_CAUSE_UNREGISTERED so that it will generate CHANUNAVAIL from app_dial (issue #3360)
+
 	* res/res_features.c (ast_bridge_call_thread_launch): set SCHED_RR separately from thread creation, so it won't fail when running as non-root (issue #5601, different fix)
 
 	* pbx.c (pbx_builtin_pushvar_helper): add new API function for setting variables that can exist multiple times (issue #2720)

channels/chan_iax2.c

@@ -2753,7 +2753,7 @@ static int create_addr(const char *peername, struct sockaddr_in *sin, struct cre
 	}
 
 	/* if the peer is being monitored and is currently unreachable, return failure */
-	if (peer->maxms && (peer->lastms > peer->maxms)) {
+	if (peer->maxms && ((peer->lastms > peer->maxms) || (peer->lastms < 0))) {
 		if (ast_test_flag(peer, IAX_TEMPONLY))
 			destroy_peer(peer);
 		return -1;

channels/chan_zap.c

@@ -7236,16 +7236,22 @@ static struct zt_pvt *mkintf(int channel, int signalling, int radio, struct zt_p
 	return tmp;
 }
 
-static inline int available(struct zt_pvt *p, int channelmatch, int groupmatch, int *busy)
+static inline int available(struct zt_pvt *p, int channelmatch, int groupmatch, int *busy, int *channelmatched, int *groupmatched)
 {
 	int res;
 	ZT_PARAMS par;
 	/* First, check group matching */
-	if ((p->group & groupmatch) != groupmatch)
-		return 0;
+	if (groupmatch) {
+		if ((p->group & groupmatch) != groupmatch)
+			return 0;
+		*groupmatched = 1;
+	}
 	/* Check to see if we have a channel match */
-	if ((channelmatch > 0) && (p->channel != channelmatch))
-		return 0;
+	if (channelmatch) {
+		if (p->channel != channelmatch)
+			return 0;
+		*channelmatched = 1;
+	}
 	/* We're at least busy at this point */
 	if (busy) {
 		if ((p->sig == SIG_FXOKS) || (p->sig == SIG_FXOLS) || (p->sig == SIG_FXOGS))
@@ -7428,6 +7434,8 @@ static struct ast_channel *zt_request(const char *type, int format, void *data,
 #endif	
 	struct zt_pvt *exit, *start, *end;
 	ast_mutex_t *lock;
+	int channelmatched = 0;
+	int groupmatched = 0;
 	
 	/* Assume we're locking the iflock */
 	lock = &iflock;
@@ -7528,7 +7536,8 @@ static struct ast_channel *zt_request(const char *type, int format, void *data,
 #if 0
 		ast_verbose("name = %s, %d, %d, %d\n",p->owner ? p->owner->name : "<none>", p->channel, channelmatch, groupmatch);
 #endif
-		if (p && available(p, channelmatch, groupmatch, &busy)) {
+
+		if (p && available(p, channelmatch, groupmatch, &busy, &channelmatched, &groupmatched)) {
 			if (option_debug)
 				ast_log(LOG_DEBUG, "Using channel %d\n", p->channel);
 				if (p->inalarm) 
@@ -7619,8 +7628,13 @@ next:
 	}
 	ast_mutex_unlock(lock);
 	restart_monitor();
-	if (callwait || (!tmp && busy))
-		*cause = AST_CAUSE_BUSY;
+	if (channelmatched) {
+		if (callwait || (!tmp && busy))
+			*cause = AST_CAUSE_BUSY;
+	} else if (groupmatched) {
+		*cause = AST_CAUSE_CONGESTION;
+	}
+		
 	return tmp;
 }