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call intrusion (CI)

Call intrusion (CI) is one of many features of digital private branch exchanges. This feature, as well as many others, is described in the ITU H.450 standards.

The Call Intrusion feature allows a third party to join and participate in an existing call. As soon as the intrusion function is triggered, this is indicated to the existing call participants by the intrusion tone or ringing tone. The connected subscriber can then listen in on the call. Overplugging is used, for example, in call centers to control the call center agent's conversation.

The overplugging tone has a frequency of 425 Hz and a clock sequence with a tone length (T) and pause length (P) of 240 ms (T) - 240 ms (P) - 240 ms (T) - 1,280 ms (P).

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Englisch: call intrusion - CI
Updated at: 22.04.2015
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