Hi, I see that pjsip has nat_type_in_sdp, which will allow us to add x-NAT in SDP. But what does x-NAT used for ? -- 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/20130306/47847975/attachment-0001.html>