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Chapter 3 Cisco CallManager Clusters

Cisco CallManager Redundancy

3-10

Cisco IP Telephony Network Design Guide

78-11103-03

In Figure 3-4, a device pool called Branch 1 G.711 ADE is configured with the

following characteristics:

• It is assigned the region Branch 1 G.711. This region contains devices that are

capable of communicating by means of G.711 only, such as a voice mail

system or conference bridge.

• It is assigned to the appropriate date/time group.

• It is assigned the Cisco CallManager redundancy group ADE, where

Cisco CallManager A is the primary, D is the secondary, and E is the tertiary.

A second device pool, called Branch 1 G.729 ADE, could be configured with the

following characteristics:

• It is assigned the region Branch 1 G.729. This region contains devices that are

capable of communicating by means of both G.729 and G.711, such as IP

phones.

• It is assigned to the appropriate date/time group.

• It is assigned the Cisco CallManager redundancy group ADE, where

Cisco CallManager A is the primary, D is the secondary, and E is the tertiary.

The same Cisco CallManager group is used for both device pools. However, it is

now possible to specify interregion communication codec requirements:

• Intraregion communication uses G.711.

• Interregion communication uses G.729 across the WAN.

• All calls to the G.711 region use G.711. This is required, for example, when

accessing an application that is G.711 only.

• This configuration is depicted in Figure 3-5.

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Cisco WS-X4604-GWY - VoIP Gateway Spezifikationen Seite 82