I have obi100 with GV, configured per instruction. Nothing else.
Most incoming calls I can get. But Yesterday morning, a friend tried to call me, said cannot get me, but to me, I never heard phone ring. After I got my friend to cell phone, I asked them to call me back, I got the ring that time.
So I missed couple times when I first booted my moden, wireless router and obi100 in the morning.