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call admission control (CAC)

Call Admission Control (CAC) is a method for improving voice quality during the transmission of voice and other real-time applications in IP networks. CAC technology is intended to safeguard the voice quality of Internet telephony

(VoIP). Call Admission Control prevents overloading of the available bandwidth

and the associated degradation ofspeech intelligibility

. The CAC process protects IP-based voice transmissions against overloading. In order to prevent a deterioration of the voice quality, no further voice connections are established above a certain load. If the permissible number of voice connections is exceeded, the existing voice connections must absorb the additional voice traffic, which leads to packet losses and impairs the voice quality of all other voice connections.

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Englisch: call admission control - CAC
Updated at: 13.01.2017
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Translations: DE