Kamailio in local network behind NAT

[lehanich]

Hello,

I have kamailio in local network behind NAT. Kamailio have one interface eth1 with ip 10.130.0.23

UserAgent - (internet) - (178.0.0.169)router_NAT - (LAN) - (10.130.0.23)kamailio+rtpproxy - pbx

I made two listeners:
listen=udp:10.130.0.23:5070 #to pbx in lan (I don`t want to put via header with 178.0.0.169)
listen=udp:10.130.0.23:5060 advertise 178.0.0.169:5060 #to internet (UserAgent need to get via header with 178.0.0.169 )

mhomed = 1 # I think It not useful for my case

UserAgent send Register and Invite to 178.0.0.169:5060, Kamailio get it on udp:10.130.0.23:5060

Kamailio Relay it to udp:10.130.0.23:5070

My pbx get requests from udp:10.130.0.23:5070 with via header 10.130.0.23

Responses to UserAgent go from udp:10.130.0.23:5060 with via 178.0.0.169

In RELAY block:
if ($Ru == «udp:10.130.0.23:5070») {
#set_send_socket(«udp:10.130.0.23:5060»);
$fs = «udp:10.130.0.23:5060»;
#force_send_socket(«udp:10.130.0.23:5060»);
} else {
#set_send_socket(«udp:10.130.0.23:5070»);
$fs = «udp:10.130.0.23:5070»;
}
#$fs = «udp:10.130.0.23:5070»;
if (!t_relay()) {
sl_reply_error();
}

route[REGISTRAR] {
...
if ($rd == "mydomain.ru" || $rd == "mydomain2.ru") {

      set_send_socket("udp:[10.130.0.23:5070](http://10.130.0.23:5070/)");
      add_path();
      route(DISPATCH);
     }

...
}

It works for requests (INVITE and REGISTER) from UserAgent to PBX thought kamailio. But INVITE from my pbx to UserAgent go out only through udp:10.130.0.23:5070, Kamailio realy it to internet from udp:10.130.0.23:5070

I get error in syslog: (pv [pv_branch.c:62]: pv_get_branchx_helper(): error accessing branch [0])

I tried set_send_socket(«udp:10.130.0.23:5070»); and $fs = «udp:10.130.0.23:5070»;

Why I can`t relay outgoing requests to internet through another socket?

Thank you.

[linuxmaniac]

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