I guess I am not explaining this correctly or perhaps I just don't know how to explain it. There is a single "OUT" connection on the door phone controller unit that already plugs directly into an analog port on the IPO and is working correctly. How can I connect a 2nd door phone to the Avaya controller unit and connect it into a second analog port if there is only one port coming out of the controller? I appreciate your patience with my ignorance of the phone side of this equation