Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 11844)
+++ channels/chan_sip.c	(working copy)
@@ -6506,6 +6506,7 @@
 	char tmp[256] = "", *uri, *a;
 	char tmpf[256], *from;
 	struct sip_request *req;
+	char *colon;
 	
 	req = oreq;
 	if (!req)
@@ -6537,21 +6538,25 @@
 		ast_uri_decode(from);
 	}
 
+	/* Skip any options */
+	if ((a = strchr(uri, ';'))) {
+		*a = '\0';
+	}
+
 	/* Get the target domain */
 	if ((a = strchr(uri, '@'))) {
-		char *colon;
 		*a = '\0';
 		a++;
-		colon = strchr(a, ':'); /* Remove :port */
-		if (colon)
-			*colon = '\0';
-		ast_copy_string(p->domain, a, sizeof(p->domain));
+	} else {	/* No username part */
+		a = uri;
+		uri = "s";	/* Set extension to "s" */
 	}
-	/* Skip any options */
-	if ((a = strchr(uri, ';'))) {
-		*a = '\0';
-	}
+	colon = strchr(a, ':'); /* Remove :port */
+	if (colon)
+		*colon = '\0';
 
+	ast_copy_string(p->domain, a, sizeof(p->domain));
+
 	if (!AST_LIST_EMPTY(&domain_list)) {
 		char domain_context[AST_MAX_EXTENSION];