switch hook flash

switch hook flash definition - telecom
A method of signaling a central office, key telephone system, or PBX by quickly depressing and releasing the switch hook on a telephone set, perhaps to answer another incoming call. Some Centrex and PBX telephone sets have special buttons that implement this function. See also switch hook.

Webster's New World Telecom Dictionary Copyright © 2008 by Wiley Publishing, Inc., Indianapolis, Indiana.
Used by arrangement with John Wiley & Sons, Inc.

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