[SR-Users] T_RELAY_TO distribute local proxy to a central one

[Sébastien Brice]

Hi guys, 
i have a kamailio running on the wan (my central kamailio) and i have phones on a private network range 172.20.0.0/16 behind a NAT.
i also run another kamailio locally to collect all sip phones on my network and this one use the DB of the remote central kamailio. 
the local kamailio does t_relay_to() the ip of the central kamailio

route {
       if (uri==myself) {

                if (method=="REGISTER") {
                route(2);
                exit;
                };

route[2] {
       rewritehost("public_remote_kamailio");
       if(!t_relay_to("udp:public_remote_kamailio:5060")) {
               sl_reply_error();
       };
       exit;
}

the bad thing is once the phones get registered with non-routable ip (like in the attached picture) trying to INVITE them directly by requesting public_kamailio_ip result in non-working situation.

how should I rewrite my dst_domain when registring in a way INVITE triggers to the local kamailio.

My local kamailio runs with the listen udp:private_local_kamailio advertise udp:public_local_kamailio

I try to be explicit but my understanding is not perfect, it would be nice you could give me a hand.

I put my local kamailio.cfg attached.

thx
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