Computer Gmail CallPhone is not working from certain IP addresses since earlier this afternoon Apr 21, 11.
Since OBi connection to GoogleVoice is equivalent to Gmail CallPhone, dialed numbers will return busy, incoming calls won't connect either.
There has been reports sent to Google Forum. Need to wait till Google fix this problem.
In the mean time, there is no need to reboot or reconfigure your OBi device.
For those affected, GV service is starting to come back up in the past few hours or so.