Hello Users, tried a lot , My UAC's are Not Hungupping in Behind the NAT/Router And also My sip proxy is also under the Behind NAT My SIP ip is 192.168.2.75 My Public IP is xx.xx.xx.xx I didn't get any Bye request to SIP server, except the Bye all the other Messages are Requested to MY SIP Server in openser.cfg i I'm using X-lites for testing in that RTP port 12222 NAT firewall ip is 192.168.2.1 Sip domain is xx.xx.xx.xx Sip proxy xx.xx.xx.xx ______________________________________________ modparam ("nathelper",rtpproxy_sock","udp: 192.168.2.75:12222" if(nat_uac_test("19")) { if(method=="REGISTER") { fix_nated_register(); force_rport(); setflag(6); } else { if(method=="INVITE") { fix_nated_sdp("3") }; fix_nated_contact(); }; }; -- Thanks and Regards Ravi Prakash Sunkara ravi.sunkara(a)hyperion-tech.com M:+91 9985077535 O:+91 40 23114549 F:+91 40 40208727 ravi.sunkara(a)hyperion-tech.com www.hyperion-tech.com