Chapter 9 Implementing Call Admission Control

Implementing multiple-site IP telephony deployments over an IP WAN requires additional planning to ensure the quality and availability of voice calls.

When an IP WAN connects multiple sites in a Cisco Unified Communications deployment, quality of service (QoS) has to be implemented to prioritize voice packets over data packets. However, to avoid an oversubscription that is caused by too many voice calls, a mechanism is needed to limit the number of calls that are allowed at the same time between certain locations. Call admission control (CAC) is the mechanism that ensures that voice calls do not oversubscribe ...

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