I had this issue on only 1 of 2 OBI202's on same network, restarts of everything did nothing, and no passwords were changed anywhere (obi or google).
Outbound calls were working, but inbound weren't. No issues placing or receiving calls on gvoice w/ browser.
This did the trick (this time):Logged into
obitalk.com portal, locate device, locate correct SP, Edit Service Provider (the gear), re-authenticate to correct google voice account, wait about 60 seconds, done.