This topic provides an overview of the upgrade process, the software releases that are involved in the upgrade process, and the different upgrade strategies that can be used based on the size of the customer network.
Note 
There may be more than one upgrade path available based on the software deployed in your specific environment. For more information, see Upgrade Paths for IP Telephony Components.
This topic contains the following sections:
When your upgrade plan is in place and you are ready to upgrade, go on to Performing a System Upgrade on the Optimize tab.