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](http://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](http://10.130.0.23:5060/) advertise [178.0.0.169:5060](http://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](http://178.0.0.169:5060/), Kamailio get it on udp:[10.130.0.23:5060](http://10.130.0.23:5060/)

Kamailio Relay it to udp:[10.130.0.23:5070](http://10.130.0.23:5070/)

My pbx get requests from udp:[10.130.0.23:5070](http://10.130.0.23:5070/) with via header 10.130.0.23

Responses to UserAgent go from udp:[10.130.0.23:5060](http://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](http://mydomain.ru/)" || $rd == "[mydomain2.ru](http://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.