你可以参考这个文档里边的一句话:
Disaster Recovery System Administration Guide for Release
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/drs/7_0_1/DRS_CUCM/drsag701.html
Before you restore Cisco Unified Communications Manager, ensure that the Cisco Unified Communications Manager version that is installed on the server matches the version of the backup file that you want to restore. The Disaster Recovery System supports only matching versions of Cisco Unified Communications Manager for restore. For example, the Disaster Recovery System does not allow a restore from version 6.1.( 1).1000-1 to version 6.1( 2).1000-1, or from version 6.1.(2).1000- 1 to version 6.1(2).1000- 2.