I was thinking that with the test we did (shorting the wires at the door box) shows that the controller is programmed properly. When we throw a temporary short across terminals - and I at the door box, all the phones assigned in ring group 1 ring and there is two way communications.

Does that not prove that the controller is programed properly?

According to my tech and the manual, the phone system automatically IDs the port the controller is plugged into as a door box, this is verified when the tech looks at the port in programming.

As mentioned above, he programmed the door box in the same ring group as the phones the client wants to ring (ring group 1)

The only other programming I see is 2101-04, "door chime selection" and by default that is set to zero. So no programming there.

Am I missing something ??

Thanks