Hi all For SIP proxy like Kamailio, it only care about if client is NATed or not. It doesn't care about client's NAT type. So if I want to let Kamailio to always use RTP proxy, I must use private IP in SIP REGISTER message, right ? As I read from issues https://code.google.com/p/csipsimple/issues/detail?id=1830 I disable both allow contact rewite and STUN for both client A and B. So this will works (voice heard) in any NAT type ? Is my assumption right ? -- Khoa Pham HCMC University of Science Faculty of Information Technology -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20130308/fbb061a5/attachment-0001.html>