Locations and Regions

In Cisco CallManager, locations work in conjunction with regions to define how voice conversations are carried over a WAN link. Regions define the type of compression, such as G.711 or G.729, used on the link, and locations define the amount of available bandwidth allocated for that link.

Figure 8-21 illustrates a CallManager centralized call-processing model with three remote sites. Each remote site has a location name that all IP endpoints in that location are associated with and a region that determines which codec is be used for voice conversations to IP endpoints in this location.

Figure 8-21 CallManager Centralized Call-Processing Model with Regions and Locations Defined

256 kbps Circuit

Location: Atlanta Region: A

Location: Atlanta Region: A

256 kbps Circuit

Location: San Jose Region: B

Catalyst Switch

Catalyst Switch

Location: San Jose Region: B

Catalyst Switch

Each IP endpoint uses the G.711 codec for voice conversations with other endpoints in the same region. When an IP endpoint establishes a voice conversation with an IP endpoint in another region, the G.729 codec is used. The following examples illustrate this:

• HQ IP Phone A calls HQ IP Phone B—Because both IP Phones reside in the same region, the G.711 codec is used.

• HQ IP Phone A calls Atlanta IP Phone A—Because these IP Phones reside in different regions, the G.729 codec is used.

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