Upgrade scenarios

Last Updated : Jul 28, 2025 |
Prolog information
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Use the same CMS version and base load number for all CMS servers in an HA environment. Upgrade the original server if it runs a different CMS version than the HA server you are adding. Use one of the following upgrade processes:
  • Base load upgrade: Perform this simplified upgrade process when the original server is on the same CMS release, but is one base load older than the new HA server.
  • Software upgrade: Perform a standard software upgrade when the original server is on an older CMS release and the new HA server uses the latest release.
  • Platform upgrade: Perform a platform upgrade when the original server is on a platform that is no longer supported with the latest CMS release. In this case, replace the old server with a platform compatible with the upgrade release.

Additional information

For more information about upgrades, see the following documents:
  • Avaya Call Management System Overview and Specification
  • Planning for Avaya Call Management System Upgrades
  • Upgrading Avaya Call Management System
  • Avaya Call Management System Base Load Upgrade