The primary purpose of the CMS High Availability (HA) option is to ensure an uninterrupted data stream between the Avaya Aura® Communication Manager system and the CMS server. With HA, two CMS servers are connected to one Communication Manager system, thereby eliminating the traditional single point of failure between the CMS and the Communication Manager system.

Refer to the product documentation for your CMS load for more information about supported Communication Manager system releases.

Both CMS servers collect data independently from the Communication Manager system. With few exceptions, both CMS servers provide full CMS capabilities. If either server fails, loses connection to the Communication Manager system, or must be brought down for maintenance, the alternate server can carry the entire CMS activity load. You must administer both CMS servers with an identical CMS setup including number of ACDs in the configuration, data storage allocation, users, and features.

The Avaya Professional Services (APS) organization offers a package that automates the synchronization between the two CMS servers. The Admin-Sync offer reduces the amount of time needed to maintain the HA servers and is required for most installations. For more information, contact APS at:

As an alternative to the Admin-Sync offer, the HA option relies heavily on manual data synchronization between the two CMS servers, as well as on manual administration synchronization. This document provides detailed descriptions of procedures needed to maintain synchronization between the two CMS servers.