diff --git a/kamailio/default.cfg b/kamailio/default.cfg
index 9c7e537..28bfcc0 100644
--- a/kamailio/default.cfg
+++ b/kamailio/default.cfg
@@ -821,6 +821,10 @@ failure_route[INTERNAL_FAULT]
         xlog("L_INFO", "$ci|failure|ignoring call barred\n");
     } else if (isflagset(FLAG_SESSION_PROGRESS)) {
         xlog("L_INFO", "$ci|failure|ignoring failure after session progress\n");
+        if (t_check_status("480")) {
+            xlog("L_INFO", "$ci|failure|overriding reply code 480 with 486\n");
+            send_reply("486", "Endpoint Not Available");
+        }
     } else if (t_check_status("403") && $T_reply_reason=="Forbidden") {
         xlog("L_WARNING", "$ci|failure|Failed auth from IP $si\n");
     } else if (t_check_status("(401)|(486)")) {