OBi100 Cannot Receive Google Voice Calls

I have long since canceled my home phone service, but I have an OBi100 (succeeded by the OBi200) paired with Google Voice for free VoIP (no emergency calls, though).

Unfortunately recently I was only able to call out but not receive calls. I tried doing everything listed on the OBiTalk forum instructions to no avail. Then I found a post about the similar OBi110. So the answer for me was the same: delete the configuration and set it up again from the beginning! Hope this helps someone!