Cisco Unified CallManager CAC

Locations CAC The locations feature provides CAC for centralized call-processing systems. A centralized system uses a single CCM cluster to control all of the locations. CCM's locations feature allows you to specify the maximum amount of bandwidth available for calls to and from each location, thereby limiting the number of active calls and preventing oversubscription of the bandwidth on the IP WAN links.

Gatekeeper zone CAC A gatekeeper device provides CAC for distributed call-processing systems. In a distributed system, each site contains its own call-processing capability. Calls are limited between zones in this configuration.