AT&T Definity ISDN 7507 - Manual (Page 19)

Automatic Callback
To automatically place 1 Press

Auto Callback

and dial extension
another call to an
[confirmation tone]
extension that is busy
● Green light comes on until callback is completed
or canceled
Note: If you send your calls to coverage, you
cannot activate Automatic Callback.
2 Hang up (within 7 seconds) or press

Drop

● You will receive a 3-burst priority ring when
both your voice terminal and the called extension
are idle
3 Lift handset when you hear priority ring
[ringback tone]
● A call is automatically placed to extension, which
receives regular ringing
Note: Only one Automatic Callback call at a time
can be placed, and Automatic Callback is canceled
after 20 to 40 minutes if the callback call is not made
(called party still busy).