> If i have a Pingtel phone(behind the NAT) with a extension 1001 in sip.conf, > and I turn on NAT=YES in sip.conf, would it work? How does your NAT=YES > works in *? It would not work because they cannot receive on the same port they transmit on. > What does RFC2833 got to do with NAT here? Sorry I meant RFC3261. Mark