Assumes both devices have GV on SP1 and are connected to the OBiTalk network.
On OBi202
Voice Services -> SP1 Service -> X_InboundCallRoute:
Change ph to {ph,pp(ob200110110)}
On OBi110
Voice Services -> SP1 Service -> X_InboundCallRoute:
Change ph to {ph,pp(ob200202202)}
200110110 is the OBi number of the OBi110.
200202202 is the OBi number of the OBi202.
This is called call forking. When a call comes in on one device it's also sent to the other. This way it doesn't matter which device receives the call. I believe the last device to log into GV will receive the calls. I'm forking in both directions in case there is a power outage and incoming calls switch to the OBi that reboots.
There is another way of doing this if both devices are on the same LAN.
I'm guessing you would need 2 OBi202s to use the pre-release software, but maybe if you use it the OBi202 would always receive the calls and you would only have to fork inbound calls to the OBi110.