--- channels/chan_sip.c	2005-10-11 16:42:38.000000000 -0400
+++ channels/chan_sip.c	2005-10-11 16:44:17.000000000 -0400
@@ -6374,6 +6374,8 @@
 		case -3:
 			/* URI not found */
 			transmit_response(p, "404 Not found", &p->initreq);
+			/* Set res back to -2 because we don't want to return an invalid domain message. That check already happened up above. */
+			res = -2;
 			break;
 		}
 		if (option_debug > 1) {