Before You Begin
See Planning Your System Upgrade on the Prepare and Plan tab to plan your overall strategy.
Prepare for a System Upgrade
To ensure that you have completed upgrade prerequisites, see Preparing for System Upgrade 
.
Upgrade Contact Center Software Components
Once you have your upgrade plan and preparations in place, perform your system upgrade by following the guidelines and sequence in Upgrading Contact Center Software Components :
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See Contact Center Deployment Models for the general upgrade sequence for the various components in the different deployment models, including Contact Center Enterprise Single Site, Contact Center Enterprise Multisite Centralized, and Contact Center Enterprise Multisite Distributed. (For a description of deployment models, see Test Deployment Models and Sites .)
•See Upgrading Contact Center Components for more detailed upgrade procedures for each major upgrade strategy: single-stage system upgrade, multistaged system upgrade, and multisite migration upgrade.
For site-specific upgrade information, see Upgrading a Specific Contact Center Test Bed .
•See Related Documentation for links to component installation and upgrade documentation.