--- ../clean/asterisk-1.4.12/channels/chan_misdn.c	2007-10-03 14:22:30.000000000 +0200
+++ channels/chan_misdn.c	2007-10-07 22:51:40.000000000 +0200
@@ -3141,8 +3141,7 @@
 			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;
@@ -3164,6 +3163,9 @@
 				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_up <= 0)
 					continue;