My previous post hasn't even made it to the list yet (am I being moderated?), but I got Vonage's Softphone service working for inbound and outbound calls. Keep in mind that there's currently no perceived limit on simultaneous inbound calls, which makes this a wonderful solution for Asterisk (at least for my use). Below is a sanitized snippet from my working sip.conf; your mileage may vary: [general] dtmfmode=inband port=5060 bindaddr=<enter yours> context=incoming disallow=all allow=ulaw externip = <enter yours> localnet = <enter yours> localmask = 255.255.255.0 nat=yes register => .. ... register => 16125551212:password@sphone.vopr.vonage.net:5061/99612 [sip99612] secret=password username=16125551212 host=sphone.vopr.vonage.net port=5061 type=peer nat=yes canreinvite=no dtmfmode=rfc2833 fromuser=16125551212 context=incoming fromdomain=sphone.vopr.vonage.net For what it's worth, my initial "host=sphone.vopr.vonage.net:5061" setting would cause * to seg-fault. I'm running CVS of late April -- haven't updated; if it ain't broke, don't patch it.