I have it configured as above (OBi #1 is GV). When I call the GV number, OBi#1 rings. Then in about two rings, the AA for OBi#2 picks up and I have to press 1 before OBi#2 rings.
On both OBi devices, I've unchecked the Voice Service->Auto Attendant->Enable
On OBi#2, my X_InboundCallRoute is set to: ph
Edit: OBi#1 is an OBi110, OBi#2 is an OBi100. Both are on the latest firmware.