NEC 5140 - Manual (Page 22)

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Callback
To request a Callback when you reach a busy or unanswered station:
z
Press the Call Me Back command key.
To answer a Callback:
z
Lift the handset.
To view and/or cancel outstanding Callbacks:
1. Press SETTINGS.
2. Press the More command key.
3. Press the Callbacks command key.
4. Press the Next and Previous command keys (if required).
5. Do one of the following:
„
To cancel a callback, press the Cancel command key.
„
To call the number shown, press the Call Again command key.
Attendant Call Hold - Remote Retrieve
To retrieve a call placed on Hold by the attendant:
1. Lift the handset.
2. Dial *23.
3. Dial the digits announced by the attendant.