Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 354937)
+++ channels/chan_sip.c	(working copy)
@@ -27978,8 +27978,8 @@
 	memset(&default_prefs, 0 , sizeof(default_prefs));
 	memset(&sip_cfg.outboundproxy, 0, sizeof(struct sip_proxy));
 	sip_cfg.outboundproxy.force = FALSE;		/*!< Don't force proxy usage, use route: headers */
-	default_transports = 0;				/*!< Reset default transport to zero here, default value later on */
-	default_primary_transport = 0;			/*!< Reset default primary transport to zero here, default value later on */
+	default_transports = SIP_TRANSPORT_UDP;
+	default_primary_transport = SIP_TRANSPORT_UDP;
 	ourport_tcp = STANDARD_SIP_PORT;
 	ourport_tls = STANDARD_TLS_PORT;
 	externtcpport = STANDARD_SIP_PORT;
@@ -28169,6 +28169,7 @@
 			char *val = ast_strdupa(v->value);
 			char *trans;
 
+			default_transports = default_primary_transport = 0;
 			while ((trans = strsep(&val, ","))) {
 				trans = ast_skip_blanks(trans);