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or call-back

[kawl-bak] /ˈkɔlˌbæk/
an act of calling back.
a summoning of workers back to work after a layoff.
a summoning of an employee back to work after working hours, as for emergency business.
a request to a performer who has auditioned for a role, booking, or the like to return for another audition.
recall (def 12).
a return telephone call.
of or relating to such a call:
Please leave a callback number.
Origin of callback
1925-30; noun use of verb phrase call back Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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callback in Technology

1. A scheme used in event-driven programs where the program registers a subroutine (a "callback handler") to handle a certain event. The program does not call the handler directly but when the event occurs, the run-time system calls the handler, usually passing it arguments to describe the event.
2. A user authentication scheme used by some computers running dial-up services. The user dials in to the computer and gives his user name and password. The computer then hangs up the connection and uses an auto-dial modem to call back to the user's registered telephone number. Thus, if an unauthorised person discovers a user's password, the callback will go, not to him, but to the owner of that login who will then know that his account is under attack.
However, some PABXs can be fooled into thinking that the caller has hung up by sending them a dial tone. When the computer tries to call out on the same line it is not actually dialing through to the authorised user but is still connected to the original caller.
3. cost control callback.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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