This might help someone.
I noticed I had the same/similar problem:
Outside caller calls my GV number. That routes to the Obi110, and in turn the Obi110 rings my phone. I answer that phone, but for the remote caller, the call is not connected, and instead it still rings, as if unanswered, and eventually hits GV voicemail.
My problem was solved by upgrading my firmware, which was 1.2.X. Now running 1.3.0 (2690), and remote calls come in and connect just fine.