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Chapter 7 Multisite WAN with Centralized Call Processing
Cisco CallManager Cluster Considerations
7-8
Cisco IP Telephony Network Design Guide
78-11103-03
The calling party search spaces in Table 7-3 would then need to be defined. These
calling search spaces would allow users to be assigned the ability to dial either
numbers within the cluster only or all numbers within the cluster as well as PSTN
calls through the local gateway.
This example presents one of the simplest configurations for multisite WAN local
call processing. The dial plan would consist essentially of a single pattern for
PSTN calls, typically a 9. Gateway selection would depend entirely upon the
partition and calling search space of the calling device, as detailed above.
Additional considerations, which would require a more ambitious dial plan, are
listed in the Calling Search Space section on page 5-15.
Cisco CallManager Cluster Considerations
The following design parameters apply for Cisco CallManager clusters in a
centralized call processing environment using Cisco CallManager Release 3.0(5):
A single primary Cisco CallManager per cluster
A maximum of 2500 IP phones per cluster
A maximum of three Cisco CallManagers per Cisco CallManager cluster
Hub-and-spoke topologies only
Table 7-3 Calling Search Space and Partition Assignments
Calling Search Space Partitions Assigned To
Cluster-X Internal Only Cluster-X Users Devices that can make only
internal calls
Cluster-X Hub Unrestricted Cluster-X Users
Cluster-X Hub PSTN Access
Internal calls and PSTN calls
through hub location gateways
Cluster-X Branch 1 Unrestricted Cluster-X Users
Cluster-X Branch 1 PSTN Access
Internal calls and PSTN calls
through Branch 1 gateway
Cluster-X Branch 2 Unrestricted Cluster-X Users
Cluster-X Branch 2 PSTN Access
Internal calls and PSTN calls
through Branch 2 gateway
Cluster-X Branch 3 Unrestricted Cluster-X Users
Cluster-X Branch 3 PSTN Access
Internal calls and PSTN calls
through Branch 3 gateway
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