we can do custom inbound call routing on an Obi device from these endpoints(obiIon/other Obi devices) without getting to AA, via single stage dialing.
it is not possible to do the same from a Gtalk endpoint. Gtalk endpoint is not sending any information that can be used for custom call routing(without going through AA).
it would be great to have this support too to complete the functionality.
Currently Gtalk usecase is similar to calling into obi device from a cellphone endpoint.