Ok, so Ive got an asterisk box all setup here at home. I have 3 internal SIP extensions; 2 ATAs and a Softphone. Everything works fine and mandy.

I am now trying to get a softphone in the office to connect to my Asterisk server and interact with my LAN based SIP phones. I can get the web based phone to register and to ring/answer the other extensions (or visa versa) but no voice is passed in either direction.

The Asterisk box is is living behind a NATed Cisco router, from which I have mapped and ACLed through port 5060 (SIP). I am obviously missing something else (possibly on the * box) but I dont know what, any advice ?