AT&T Door Phone Controller - Manual (Page 74)

Operation – Basic Door Answer Function
Visitor Presses Door Speaker Button
When a visitor presses the door speaker push button, the
AT&T Door Phone Controller will signal the telephone
equipment inside your building to ring, and activate an auxiliary
alert (door-bell/chime) (optional). Any additional presses on the
door speaker push button will be ignored (with the exception
that a confirmation tone will still be sent to the speaker when
the door button is pressed).
Answering a Call From the Door Speaker
When a person inside the building hears the telephone ring
and/or the door bell/chime sound, he can respond by answer-
ing the ringing phone. At this point, the AT&T Door Phone
Controller will establish two-way communication with the door
speaker. To open the door, the person inside the building either
enters the Door Code on the telephone’s keypad or presses
the customer provided door-unlock push button. Either of these
actions will activate the customer provided electric door strike
plate device.
As an alternative response to hearing the telephone or door
bell/chime, the person inside the building can press the door-
unlock push button which will stop the ringing and will open the
door. This allows the door to be unlatched without the use of a
phone.
Installation - No Dedicated Trunk/Station Port 6-9