You must have 2 OBi1xx devices.
I thought it was the last OBi1xx to register to GV that receive the inbound calls, but apparently it's the last to be used.
I just learned something today.
Anyway, make the following changes on both OBi1xx's using OBi Expert.
Assuming GV is defined on SP1
Voice Services -> SP1 Service -> X_InboundCallRoute: ph,pp(200xxxxxx)
Voice Services -> OBiTalk Service -> InboundCallRoute: ph
Change 200xxxxxx to the OBi Number of the other OBi1xx