Call admission control (CAC), also known as WAN bandwidth management, helps to prevent poor quality of experience for users ...

Call admission control (CAC), also known as WAN bandwidth management, helps to prevent poor quality of experience for users on congested networks by determining, based on available network bandwidth, whether to allow real-time communications sessions to be established. (CAC controls real-time traffic only and does not affect data traffic.) If a new voice or video session exceeds the bandwidth limits that you have set on a WAN, the session is either blocked or (for phone calls only) can be rerouted to the PSTN.
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