added RR patch from iroot #10908, thanks.

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@89445 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_misdn.c

@@ -3143,16 +3143,12 @@ static struct ast_channel *misdn_request(const char *type, int format, void *dat
 			if (!rr->port)
 				rr->port = misdn_cfg_get_next_port_spin(rr->port);
 			
-			for (; rr->port > 0 && rr->port != port_start;
-				 rr->port = misdn_cfg_get_next_port_spin(rr->port)) {
+			for (; rr->port > 0; rr->port = misdn_cfg_get_next_port_spin(rr->port)) {
 				int port_up;
 				int check;
 				int max_chan;
 				int last_chance = 0;
 
-				if (!port_start)
-					port_start = rr->port;
-
 				misdn_cfg_get(rr->port, MISDN_CFG_GROUPNAME, cfg_group, BUFFERSIZE);
 				if (strcasecmp(cfg_group, group))
 					continue;
@@ -3166,6 +3162,12 @@ static struct ast_channel *misdn_request(const char *type, int format, void *dat
 				if (check && port_up < 0)
 					ast_log(LOG_WARNING,"This port (%d) is blocked\n", rr->port);
 
+				if ((port_start == rr->port) && (port_up <= 0))
+					break;
+
+				if (!port_start)
+					port_start = rr->port;
+
 				if (port_up <= 0)
 					continue;