Index: /branches/1.8/channels/chan_sip.c
===================================================================
--- /branches/1.8/channels/chan_sip.c	(revision 319995)
+++ /branches/1.8/channels/chan_sip.c	(working copy)
@@ -13302,6 +13302,13 @@
 		assume that the domain part is a host name and only look for an A/AAAA record in DNS.
 	*/
 
+	/* If we took in an invalid URI, domain may not have been initialized */
+	/* ast_sockaddr_resolve requires an initialized domain string. */
+	if (!domain) {
+		ast_log(LOG_WARNING, "Invalid URI: parse_uri failed to initialize domain\n");
+		return -1;
+	}
+
 	if (ast_sockaddr_resolve_first(addr, domain, 0)) {
 		ast_log(LOG_WARNING, "Invalid host name in Contact: (can't "
 			"resolve in DNS) : '%s'\n", domain);