Mediaproxy is working only when the caller is behind NAT.  If the  Caller is in the public network and the callee is behind NAT, the mediaproxy does not work..  if I use the mediaproxy for all the invites then everything is working but I want to use the mediaproxy only when one of the party is behind NAT.

 

This is how am using the mediaproxy in my configure. 

        if (method=="INVITE" && isflagset(5)) {
                        use_media_proxy();
                        t_on_reply("1");

};

 

 

onreply_route[1] {

 

 if (status=~"(183)|2[0-9][0-9]") {
        if (client_nat_test("1")) {
            fix_contact();
        };
        use_media_proxy();
    };
    if (status=~"[3-4]0[0-9]") {
        end_media_session();
        break;
    };
}
 

Please let me know what i need to do to check if calle is behind NAT. 

 

thanks

Mohamed