[Serusers] Mediaproxy doesnt resolve private IP to public IP

Hi, I m using mediaproxy for NAT traversal for client phones. I m using the following code straight out of book from ser-0.9.0 source package, but still the natted clients are showing their internal IPs in their AOR when I run a "serctl ul show ". Can anyone tell me where is the problem- route{ if (!mf_process_maxfwd_header("10")) { if (method!="ACK") { sl_send_reply("483", "Too many hops"); }; break; }; if (msg:len >= max_len) { if (method!="ACK") { sl_send_reply("513", "Message too big"); }; break; }; if (method=="REGISTER") { if (client_nat_test("3")) {setflag(2);force_rport();fix_contact();}; if (!www_authorize("", "subscriber")) {www_challenge("", "0");break;} if (!save("location")) {sl_reply_error();}; break; }; if (method=="INVITE") { if (!(is_from_local() || is_uri_host_local())) {sl_send_reply("403", "Relaying is forbidden");break;}; t_on_failure("1"); } else if (method == "BYE" || method == "CANCEL") {end_media_session();}; if (loose_route()) { if (method=="INVITE" || method=="ACK") {use_media_proxy();}; t_relay(); break; }; # Force subsequent messages to pass trough this proxy if (method == "INVITE") {record_route();}; if (client_nat_test("3") && !search("^Record-Route:")) {force_rport();fix_contact(); }; if (method=="INVITE") { t_on_reply("1"); }; if (!lookup("location")) { sl_send_reply("404", "User not found"); break; }; if (method=="INVITE" || method=="ACK") { use_media_proxy(); }; if (!t_relay()) { if (method=="INVITE" || method=="ACK") { end_media_session(); }; sl_reply_error();}; } failure_route[1] { end_media_session(); } onreply_route[1] { if (status=~"(183)|(2[0-9][0-9])") { if (client_nat_test("1")) { fix_contact(); }; use_media_proxy(); }; } Regards, Ashutosh Kumar Chetu, Inc.