Could I ask what do you envision as your goals or objectives? What do you want the product to do?
The Obi has lots of features, but are there any other features you want besides only forwarding? Also, who is your telephone/VOIP provider right now (e.g. Google Voice)?
A lot of questions, I know. But if you can explain some more about what you are trying to accomplish, I'm sure someone here can address your questions.