Before you perform an upgrade to a Cisco CallManager version, download and run the latest version of Cisco CallManager Upgrade Assistant Utility, a nonintrusive tool that detects the health of the servers in the Cisco CallManager cluster without changing the state of the system.
To verify that the server meets the minimum requirement for the Cisco CallManager version to which you are upgrading, refer to the Cisco CallManager Compatibility Matrix. To obtain the most recent version of this document, go to http://www.cisco.com/univercd/cc/td/doc/product/voice/c_callmg/ccmcomp.htm.
