To Route inbound calls to the OBi202 phone ports and the OBi110:
Change OBi202 Phone Services -> SP1 Service -> X_InboundCallRoute to:
{ph1,ph2,pp(ob200222222)}
The way I set it up using OBitalk, the OBi110 only needs access to the internet. It can be on a Lan in a different City. Connecting the OBi110 to the router will work. I don't have an OBi202, but connecting the OBi110 to the OBi202 Lan port should also work.
The path is from the OBi110 to the OBiTalk Server and then to the OBi202.
There is a more complicated setup which goes from the OBi110 directly to the OBi202. let me know if you're interested.