* call transfer doesn't work. I don't know if it ever did (this is my first Obi unit). It works for me, at least on inbound calls. - I receive a call, hit transfer, dial the new number, hear the target answer, and then hit Transfer Now. The new call disappears and the original call remains on hold. Might be user (my) error, but the sequence seems right to me.
* voicemail pilot does not work - dialing my own GV number should take me to the voicemail menu, but it just hangs up Also works for me. Have you gone to the Google Voice legacy web page and configured your voicemail box? You need to at least enter a PIN (twice) and save the setting. You might as well record your name and record your greeting while you are there. - Yes, that was the issue. Once I set a PIN, I was able to dial in to my voicemail box.