I agree with Bob, at least for my purposes. Right now I have Callcentric on both my SPs, because it gives me a unique ring for each number. I want to setup Localphone for outgoing calls, and hope to do that with the Voice Gateway capability of the OBi, once I figure that out. If I can't get it to work that way, then I guess I'll have to either accept the same ring for both incoming Callcentric numbers OR have the less-used one go to voicemail.