Hi all, Here is my confusion about SER supporting NAT transversal. 1. With only RTPProxy, what kinds of types of NAT can SER with nathelper transverse? 2. What's the difference between MediaProxy and RTPProxy? 3. If UA supports STUN, do SER need to configure nathelper to support NAT transversal? Just because I knew STUN protocol only process a few kinds of types of NAT, I want to know what advantage it will add if I configure SER with nathelper. Thanks a lot! _________________________________________________________________ 免费下载 MSN Explorer: http://explorer.msn.com/lccn/