A "Release Set" is defined as the combination of products, components, and software versions that were tested to work together as an integrated system. A particular system release is also referred to as a Release Set.
The system that is targeted for the upgrade process and discussed in this document include:
•
IP Communications Systems Test Release 4.1—The currently deployed software release set that is being upgraded. Detailed information on the deployment models and topologies developed to test the 4.1 release set is available in the following documents at: http://www.cisco.com/univercd/cc/td/doc/product/voice/ip_tele/gblink/system/gbtst4x/index.htm 
–Systems Test Architecture Reference Manual for IPCC Enterprise
–Systems Test Architecture Reference Manual for North America IPT
–Systems Test Architecture Reference Manual for EMEA IPT
•Cisco Unified Communications Release 5.0—The new software release set that is the goal of the upgrade process. For detailed information on the deployment models and topologies developed to test the Cisco Unified Communications release set, refer to Review Tested Deployment Models for IP telephony
Note A majority of the IP telephony and contact center components' names have changed as part of Cisco Unified Communications System Release 5.0. Consequently, in this document, we use the new names to reference Cisco Unified Communications Release 5.0 components and old names to reference the same components when part of the Cisco IP Communication (IPC) Systems Test Release 4.1.
Go on to Upgrade Overview for an overview of the upgrade process.