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Chapter 3 Cisco CallManager Clusters

Cisco CallManager Redundancy

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Cisco IP Telephony Network Design Guide

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Cisco CallManager Redundancy

Within a cluster, each registered IP phone can be assigned a prioritized list of up

to three Cisco CallManagers with which it can register for call processing. Shared

resources such as gateways using the Skinny Gateway Protocol are also capable

of using this redundancy scheme. The Media Gateway Control Protocol (MGCP)

also operates in a similar fashion to provide spatial redundancy for call

processing. Peer-to-peer protocols such as H.323 also facilitate redundancy.

Figure 3-2 depicts the redundancy scheme using three Cisco CallManagers.

Figure 3-2 Cisco CallManager Redundancy Group

Each IP phone maintains active TCP sessions with its primary and secondary

Cisco CallManagers. This configuration facilitates switchover in the event of

failure of the primary Cisco CallManager. Upon restoration of the primary, the

device reverts to its primary Cisco CallManager.

Redundancy Group Configurations

You can design your system to provide call processing redundancy by configuring

Cisco CallManager redundancy groups. A Cisco CallManager redundancy group

is a prioritized list of up to three Cisco CallManagers. You can then assign

individual devices to a specific Cisco CallManager redundancy group. A

Cisco CallManager redundancy group is a subset of a cluster; all members of a

redundancy group are also members of a cluster.

Primary

Secondary

Tertiary

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 78