AT&T Door Phone Controller - Manual (Page 65)

number, 1 or 2 (these can be selected by pressing ##1 or ##2
once connection to the speaker has been made). Any
additional presses on the door speaker push button will be
ignored while the Door Phone Controller is off-hook.
Answering a Call Sent When a person answers the ringing telephone, the Door Phone
From the Door Phone Controller will establish two-way communications 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.
Opening door will terminate
station mode access.
Calling the Door
Speaker
Either of these actions will close the metallic contacts which
activate the customer provided electric door release.
To initiate a call to the Door Speaker, the person inside the
building simply takes the telephone off-hook and dials the
station phone number of the door speaker.
Installation - Dedicated Station Port 5-9