This just happened to me, all of a sudde on my obihai202. I have 3 google voice accounts. 2 exhibit this problem, 1 does not. All from the same phone. My testing has led to the following. (A, B are non working C is working)
For A,B
Cell phone -> A/B = unable to answer through obihai (picking up the phone leads to silence). Google hangout and cell phone associated with gv both continue to ring despite obihai extension off the hook.
Google Hangouts Dialer -> A/B = works as expected. Picking up the phone results in connection.
For C
Any incoming call on account C works fine. So I know the phone works, and the obihai is capable of answering a GV incoming call.
Something changed on accounts A/B on google's end I think. Nothing has changed on my end from last week when it was working great, to this week when it is not. Might this have something to do with the "fix" they pushed out for google home? I don't have a google home, but maybe my accounts were adversely affected?
Things I've tried:
Resetting router, modem, obihai
Deleting GV accounts and readding
Factory resetting obihai
Any ideas welcome.