another one

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@15536 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/endpoints/mod_sofia/sofia.c

@@ -3187,7 +3187,7 @@ static void sofia_handle_sip_r_options(switch_core_session_t *session, int statu
 	}
 
 	if (gateway) {
-		if (status >= 200 && status < 600 && status != 408) {
+		if (status >= 200 && status < 600 && status != 408 && status != 503) {
 			if (gateway->state == REG_STATE_FAILED) {
 				gateway->state = REG_STATE_UNREGED;
 			}