On-hook meaning

(by extension) Describing the idle state of a subscriber or PBX user loop.
adjective
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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.
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Describing the state of a telephone (similar device) when it is available but not in use.
adjective
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