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Designing Voicemail Systems with Cisco Unity Connection


  1. Determining Server Sizing
  2. High-Availability and Redundancy
  3. Server Sizing and Platform Overlays
  4. Summary

Chapter Description

This chapter focuses on the Cisco Unity Connection product design and capabilities as they pertain to its various systems, database, and networking.

From the Book

Cisco Unity Connection

Cisco Unity Connection


High-Availability and Redundancy

As of version 7.x software, Cisco Unity Connection supports the active-active cluster pair configuration. This configuration is defined as active-active because both servers actively process calls. In the active-active cluster pair configuration, the active-active cluster pair can support up to 500 ports (250 ports/server) simultaneously, depending on the server platform. If one server in a cluster pair is unavailable, the other server can handle all voice messaging, but with a decreased number of ports (maximum of 250 ports). Therefore, if high availability is a requirement, the total number of ports considered in the design should be kept at a maximum of 250 ports to ensure port availability during an outage. In this way, a server failure can still maintain the required number of ports.

The active-active cluster pair requires two servers with the same software level. The two servers are actively processing calls, even though a single database is still actively performing load sharing and providing redundancy in case of server failure. You can explore the active-active cluster pair design and configuration in the next chapter. At this time, you need to consider this model in your design if high availability is a requirement in tour voice-messaging solution.

Figure 2-2 illustrates the single server and active-active cluster pair design.

Figure 2-2

Figure 2-2 Single Server and Active-Active Cluster-Pair Design

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