# Migration from Unrestricted to Restricted CUCM Version #
Migration from the Unrestricted version to the Restricted version is NOT SUPPORTED. After you install or upgrade to an Unrestricted release, you can never upgrade to a Restricted version. You are not even allowed to fresh install a Restricted version on a system that contains an Unrestricted version
A DRS backup/restore is also not possible as the DRS file will be tagged as coming from an unrestricted deployment, and can only be restored on the same version of an unrestricted image. The only way to go from an unrestricted to a restricted version is to perform a fresh install of the restricted image from the same release you're running, and use the BAT export / import.
POSSIBLE SOLUTION: To change the Unrestricted to Restricted version, first check whether you have 'Restricted version in your inactive partition or not. (CLI: 'show version inactive') If yes, then you need to switch the version to that inactive partition (Restricted) and upgrade again to the Restricted one with the correct media. > If you don't have any ‘Restricted’ version in ‘Inactive partition’ then the only option left is to rebuild the CUCM server’s
No impact exists to other security features such as HTTP(s), SSH, password encryption and authentication (for example, SIP digest authentication), mechanisms used by unrestricted Unified CM clients such as JTAPI, TSP, encryption of SNMP traffic, encryption of data related to database that is done by using IPSEC and IMS on the server side. The communication between CTL client and provider remains encrypted.