Use the Cisco Device Assignment Tool (Device Assignment Tool) to assign users to devices in Cisco Unified Communications Manager Releases 6.x and later. This tool helps simplify your licensing when you upgrade your system and your existing users do not have assigned devices. In user-based licensing, devices are assigned to users to simplify self care and device management for you. From a licensing standpoint, devices that users own share a license, instead of requiring a separate license for both a device and a user.
The tool connects to your system and reads the configured devices that are not assigned to users. Using rules that you select, the tool matches users to unassigned devices. You can review the user-to-device matches, make manual changes if needed, and then apply the results in the Cisco Unified Communications Manager database.
For more information about licensing for Cisco Unified Communications Manager, Releases 10.x and earlier, see the the "Licensing" chapter in the Cisco Unified Communications Manager Features and Services Guide
For Releases 11.x and later, see the System Configuration Guide for Cisco Unified Communications Manager