Location Based CAC Operation

The Cisco CallManager centralized call-processing model uses a hub-and-spoke topology. The host site, or hub, is the location of the primary Cisco CallManager controlling the network while the remote sites, containing IP endpoints registered to the primary CallManager, represent the spokes. The Cisco CallManager Administration web page can be used to create locations and assign IP endpoints, such as IP Phones, to these locations. After the locations have been created and devices have been assigned, you can allocate bandwidth for conversations between the hub and each spoke locations.

For calls between IP endpoints in the host site of Figure 8-20, the available bandwidth is assumed to be unlimited, and CAC is not considered. However, calls between the host site and remote sites travel over WAN links that have limited available bandwidth. As additional calls are placed between IP endpoints over the WAN links, the audio quality of each voice conversation can begin to degrade. To avoid this degradation in audio quality in a CallManager centralized call-processing deployment, you can use the locations feature to define the amount of available bandwidth allocated to CallManager controlled devices at each location and thereby decrease the number of allowed calls on the link.

Figure 8-20 CallManager Centralized Call-Processing Model

Figure 8-20 CallManager Centralized Call-Processing Model

The amount of bandwidth allocated by CallManager locations is used to track the number of voice conversations in progress across an IP WAN link on a per-CallManager basis. CallManager servers in a cluster are not aware of calls that have been set up by other members in the cluster. To effectively use location-based CAC, all devices in the same location must register with the same centralized CallManager server.

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