
Chapter 3 Cisco CallManager Clusters
Cluster Operation and Scalability Guidelines
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Cisco IP Telephony Network Design Guide
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A dedicated database publisher and a dedicated TFTP server are recommended for
large systems. For smaller systems, the function of database publisher and the
TFTP server can be combined. Table 3-1 provides guidelines for scaling devices
with Cisco CallManager clusters.
The preceding recommendations provide an optimum solution. It is possible to
reduce the amount of redundancy, and hence use fewer servers. For small systems
the database publisher, TFTP server, and Cisco CallManager backup functions
can be combined.
Table 3-1 Cisco CallManager Cluster Guidelines
Required Number of
IP Phones within a
Cluster
Recommended Number of
Cisco CallManagers
Maximum Number of
IP Phones per
Cisco CallManager
2,500 Three servers total:
• Combined publisher / TFTP
• One primary
Cisco CallManager
• One backup
Cisco CallManager
2,500
5,000 Four servers total:
• Combined publisher / TFTP
• Two primary
Cisco CallManagers
• One Backup
Cisco CallManager
2,500
10,000 Eight servers total:
• Database publisher
• TFTP server
• Four primary
Cisco CallManagers
• Two backup
Cisco CallManagers
2,500
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