AT&T 8503T - Manual (Page 22)

To place a call using a 1 Dial appropriate Abbreviated Dialing List code:
personal, group, system,
● List 1
or enhanced list
● List 2 [dial tone]
● List 3
2 Dial desired list item (1, 2, 3...)
● Stored number is automatically dialed
Automatic Callback [ _ ]
To automatically place 1 Press [ Auto Callback ] during call attempt
another call to an [confirmation dial tone]
extension that was busy
or did not answer
● Green light goes on steadily until callback is
completed or canceled
2 Hang up
● You will receive a 3-burst priority ring when the
extension you attempted to call is available
Note: After you activate Automatic Callback,
the system monitors the called extension. That
extension becomes available after the called party
completes a call.
3 Lift handset when you hear priority ring
[ringback tone]
● A call is automatically placed to extension, which
receives regular ringing
Note: You can place only one Automatic Callback
call at a time, and Automatic Callback is canceled
after 30 minutes or if the callback call is unanswered.
To cancel an 1 Dial Automatic Callback Cancel code
Automatic Callback [confirmation tone]
request
● Green light goes off
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