I'm trying out SIP softphones, X-Lite and SJPhone, and both does not have any audio behind NAT. Everything else seems to work, incoming & outgoing calls reach SIP client & Asterisk server, but as soon as I should be hearing something, nada. I've tried changing SIP client description in Asterisk (nat=yes/no), changing proxy type in X-Lite, nothing seems to help. What bothers me is that incoming calls do get thru NAT (ringing notification), but audio does not. Shouldn't Asterisk be sending/receiving audio on the same UDP port as where SIP comms? What could be the problem here? Dumb-headed NAT box? Outside NAT everything works just fine. I've googled the web & usenet without results. TIA, Peter