if you use Asterisk settings here is the setting for vBuzzer [vbuzzer] type=friend user= host=vbuzzer.com port=80 fromdomain=vbuzzer.com fromuser= secret= username= insecure=very context=inbound ; Or whichever context you would like incoming calls to be placed to. authname= dtmf=rfc2833 dtmfmode=rfc2833 canreinvite=no nat=yes ; Even if not behind a nat, use nat=yes useragent=vbuzzer/1.0 disallow=all allow=gsm allow=ulaw allow=alaw qualify=200