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Cisco IP Telephony Network Design Guide

78-11103-03

Chapter 3 Cisco CallManager Clusters

Intracluster and Intercluster Feature Transparency

The distributed architecture of a Cisco CallManager cluster provides the

following primary benefits for call processing:

• Spatial redundancy

• Resiliency

• Availability

• Survivability

In addition, a cluster provides transparent support of user features across all

devices in the cluster. This enables distributed IP telephony to span an entire

campus or high-speed metropolitan-area network (MAN) with full features.

Intercluster communication provided by H.323 permits a subset of the features to

be extended between clusters. These features are currently available between

clusters:

• Basic call setup

• G.711 and G.729 calls

• Multiparty conference

• Call hold

• Call transfer

• Calling line ID

In addition, Call Park is available within a cluster but not between clusters.

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Cisco WS-X4604-GWY - VoIP Gateway Especificações Página 93