Why are you not making the cellphone one of the GV forwarding phones? Your cellphone will get the caller's number. The call will go to GV voicemail unless you or your cellphone's voicemail answer within about 25 seconds.
Great question - because I have multiple GV accounts. One of the other ones is the one I have to make the forwarding phone, hence, why I was forwarding this line through the ObiPhone. By going through Obi it is going straight to cellphone, and I am trying to figure out how to avoid that and have it ring.