Hi. Well issue already described there :

https://github.com/kamailio/kamailio/issues/2271

I will be really happy if somebody point me what exactly i have to do to
route 404 answer from Registar to UA.

If i understand right, in moment when registrar generate 404 i have to
see in log message which generated inside onreply_route[REPLYROUTE]

but in current moment i not see it and 404 not transmitted to UA. And it
just silently ignored by Kamailio.

In case if i am right and this is a bug in Kamailio please point me what
words i have to use to prove that this is really bug.

In current moment routing config looks like :

request_route
{

         # per request initial checks
         route(REQINIT);

         route(CATCH_CANCEL);

         route(RR_PARSE);

         route(REGISTRATION);

         xlog("L_INFO", "Initial relay packet\n");
         $du = "sip:10.34.64.2:5060";

         route(FORWARD);

         # update $du to set the destination address for proxying
         exit;
}

route[CATCH_CANCEL]
{
     if (is_method("CANCEL") == true)
     {
         if (t_check_trans() == true)
         {
             route(FORWARD);
         }
         sl_reply("500", "Internal Server Error");
         drop;
     }
}

route[RR_PARSE]
{
     if(loose_route() == true )
     {
         xlog("L_INFO", "RR-enforced\n");
         append_hf("P-hint: rr-enforced\r\n");
         route(FORWARD);

     } else
         {
             xlog("L_INFO", "RR simple\n");
             record_route();
         }
}

route[REGISTRATION]
{
     if(is_method("REGISTER") == true)
     {
         add_path_received();
         append_hf("Supported: path\r\n");
         xlog("L_INFO", "GOT REGISTER\n");
     }
}

# Per SIP request initial checks
route[REQINIT]
{
         if($ua =~ "friendly-scanner|sipcli|VaxSIPUserAgent") {
                 # silent drop for scanners - uncomment next line if
want to reply
                 # sl_send_reply("200", "OK");
                 exit;
         }

         if (!mf_process_maxfwd_header("10")) {
                 sl_send_reply("483","Too Many Hops");
                 exit;
         }

         if(is_method("OPTIONS") && uri==myself && $rU==$null) {
                 sl_send_reply("200","Keepalive");
                 exit;
         }

         if(!sanity_check("1511", "7")) {
                 xlog("Malformed SIP message from $si:$sp\n");
                 exit;
         }
}




route[FORWARD]
{
     t_on_failure("FAILROUTE");
     t_on_reply("REPLYROUTE");
     if(t_relay() <= 0)
     {
         sl_reply_error();
     }

     drop;
}


onreply_route[REPLYROUTE]
{
     xlog("Reply SIP message from $si:$sp\n");
     if (t_check_trans() == false)
     {
         drop;
     }
}


failure_route[FAILROUTE]
{
     xlog("Reply Fail SIP message from $si:$sp\n");

}






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