From 25d176d3efe99fbcaabcc6e0146a5183ee8f13fa Mon Sep 17 00:00:00 2001
From: lazedo <luis.azedo@factorlusitano.com>
Date: Thu, 18 Jun 2020 11:01:53 +0000
Subject: [PATCH] override 480 if call is progress

* FLAG_SESSION_PROGRESS is set when
  the media server sends a 180/183
  which is triggered after a route reply.
  if there are no endpoints to bridge
  to (dnd, faulty callflow) the return code
  from the media can be 480 if not set explicitly by
  callflow action. in that case
  we were passing it to the incoming leg
  carrier/endpoint and some carriers retry
  the call which we don't want.
---
 kamailio/default.cfg | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kamailio/default.cfg b/kamailio/default.cfg
index d9fb9e6..53c8344 100644
--- a/kamailio/default.cfg
+++ b/kamailio/default.cfg
@@ -744,6 +744,10 @@ 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)")) {