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Cisco IP Telephony Network Design Guide
78-11103-03
Chapter 3 Cisco CallManager Clusters
Intracluster and Intercluster Feature Transparency
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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