I recently moved into an old apartment and found this contraption in a closet, with wiring going in different directions around the door frame. Some of the wires are cut in places mid-wall and have been painted over into the wall. Right adjacent to it, by the closet door, is the equally ancient buzzer I use to let people into the building. Both the audio AND video feedback don't work -- I just press the unlabeled button for entry; it has no telephone capability.
My concern with the wiring is that occasionally my buzzer will go off for a split second even though my door isn't being rung (when it IS my door, the screen turns on too, so I'd know). The screws on the contraption are labeled "RGBY," which a quick Google suggests landline telephone wiring -- except! -- there is no phone jack in my apartment.
So: Is this just a remnant of previous landline wiring? Can it be causing the false buzzing? What's that hole in the center? Just, what is it overall?