On-hook Definition
adjective
(by extension) Describing the idle state of a subscriber or PBX user loop.
Wiktionary
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other
A condition that exists when a telephone receiver or handset is in its cradle and available to receive an incoming call. The term refers to the fact that early telephone handsets hung from a switch hook, a hook that activated a switch. See also off-hook.
Webster's New World Telecom
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