said by caseydoug
:...I just checked the logs of my VoIP adapter and got the IP address, then used the speed dial feature of my adapter to dial the URI. This is a direct connection, without going through Gizmo or any other SIP provider. From there I was able to get to my voicemail, press 2 to dial out, etc. ...
What is the IP? Are you sure it is a Google IP or could it be Gizmo? I didn't think either Google Voice or GrandCentral directly communicate with your computer or adapter. Could you be going through Gizmo?