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What are the steps to follow before performing an upgrade to a Cisco Unified CallManager version
For a successfull upgrade of the Cisco CallManager version, complete these steps:
Before you perform an upgrade to a Cisco Unified CallManager version, download and run the latest version of Cisco Unified CallManager Upgrade Utility, a nonintrusive tool that detects the health of the servers in the Cisco Unified CallManager cluster without the change of the state of the system. Refer to Using Cisco Unified CallManager Upgrade Utility 4.2(3) for more information.
Note: Cisco strongly recommends that you perform these tasks prior the Upgrade Utility.
Also verify that you disable the CSA service whenever you want to perform a task that requires the server to be restarted, such as installation, upgrades, or uninstallation of software. If you disable the CSA service, you must reenable it before it starts to monitor the Cisco CallManager server again.