I set this up and now i goes to obi auto attendant on the 110 and says press 1 to continue call.....then google voicemail will not pickup the call if it goes unanswered.
Try setting the OBi110 OBiTALK inbound call route to its phone port ph1, not the OBi's auto attendant. Then maybe GV will pickup an unanswered call.
OE