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Definition of Call delay
1. Noun. (telecommunication) In telecommunication, the delay that occurs when a call arrives at an automatic switching device and no channel or facility is immediately available to process the call. ¹
2. Noun. (telecommunication) The time between the instant a system receives a call attempt and the instant of initiation of ringing at the call receiver end instrument. ¹
¹ Source: wiktionary.com