Samsung OfficeServ DS-5021D User Manual page 55

NOTE
A callback will be cancelled if not answered within 30 seconds. If you have set a callback, your
[CBK] button's LED, if programmed, will light.
Cancelling Callback
A maximum of 5 callbacks can be set for extensions or external calls lines at the same time.
To cancel a callback, follow the procedure below.
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3 When the line becomes free, the system will call
you back.
4 Lift the handset or press the [Send] button to respond
to the Callback. Wait for dial tone and dial the telephone
number or speed dial number again.
1 Press the [CBK] button or press [4]
You will hear confirmation tone.
2 Press the [Hold] button. This will cancel the oldest
callback that you have set.
[4].
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