After you dial, you hear a female voice say: We cannot complete your call.
This is not an issue with your OBi device. Most likely, this is a temporary service interruption where Google Voice is unable to connect your call. You may try your call again later.
Google Voice on the OBi
When I use the number which is the forwarded phone for Google Voice to call my Google Voice, it always goes to voicemail.
6001 America Center Dr
San Jose, CA 95002