Vad-- I believe it's a viking door phone branded avaya and the controller is definately a viking controller. I have it connected to the line port and the button on the phones does come up at line 4 in programming mode. It's only being used as a doorbell/ intercom and no door strike is attached to it.
Dex-- I assume by connecting a regulat analog phone to the door box itself is to see if I get a bell to ring on the inside phones to determine if the door box is actually working properly??