I have Google voice with a Obi 220. Over the last 6 months many calls do not ring, but go into voice mail. I do not have GV set with any "quiet time". I have used this setup for many years and several GV accts.
During this time, I also frequently receive a call and cannot hear the other person. They have to call back and all is OK.
Is this GV, Obi, or both?