diff -Nurp -x .svn a/channels/chan_sip.c b/channels/chan_sip.c
--- a/channels/chan_sip.c	2009-09-15 12:21:38.284506385 -0400
+++ b/channels/chan_sip.c	2009-09-15 12:24:21.095528125 -0400
@@ -24228,9 +24228,11 @@ static struct sip_peer *build_peer(const
 					peer->transports |= SIP_TRANSPORT_UDP;
 				else if (!strncasecmp(trans, "tcp", 3))
 					peer->transports |= SIP_TRANSPORT_TCP;
-				else if (!strncasecmp(trans, "tls", 3))
+				else if (!strncasecmp(trans, "tls", 3)) {
 					peer->transports |= SIP_TRANSPORT_TLS;
-				else
+					peer->addr.sin_port = 0;
+					peer->socket.port = 0;
+				} else
 					ast_log(LOG_NOTICE, "'%s' is not a valid transport type. if no other is specified, udp will be used.\n", trans);
 
 				if (!peer->default_outbound_transport) { /*!< The first transport listed should be default outbound */