Authorized Self-Study Guide Cisco IP Telephony (CIPT), Second Edition

Chapter 2. Cisco Unified CallManager Clustering and Deployment Options

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This chapter covers the following topics:

• The concepts and design strategies behind a Cisco Unified CallManager cluster

• The types of replication that occur in a Cisco Unified CallManager cluster

• Properly designing the Cisco Unified CallManager cluster for redundancy

• The four Cisco Unified CallManager deployment models

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Legacy PBX systems have quite the reputation for reliability. As a general track record, PBXs provide an uptime of 99.999 percent (known as the “five-nines” of reliability). This translates to an unbelievable 5.3 minutes of downtime ...