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7-9
Cisco IP Telephony Network Design Guide
78-11103-03
Chapter 7 Multisite WAN with Centralized Call Processing
Cisco CallManager Cluster Considerations
With WAN Cisco CallManager clusters, all active devices are required to register
with a single Cisco CallManager. This allows the Cisco CallManager to maintain
call state for all calls and thereby ensure that the specified bandwidth to a location
is not exceeded.
Figure 7-4 shows devices registered to a single Cisco CallManager.
Figure 7-4 Registration to a Single Cisco CallManager in a Cluster
Where more than 2500 remote devices are required, multiple WAN clusters can
be configured and interconnected using H.323. For a more detailed discussion,
see Chapter 3, Cisco CallManager Clusters.
In this model, a single Cisco CallManager redundancy group should be
configured, and it should be the default Cisco CallManager redundancy group. All
devices would then be assigned to this group to ensure that they all are registered
to the same Cisco CallManager.
Centralized call
processing cluster X
Primary
Secondary
Cluster X
Location 1
Cluster X
Location 2
IP
IP
IP
IP
40814
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