One thing I wanted to add to Mahesh's great info, was that the Name of the Backup Utility name changed between CCM 3.2 and 3.3 This is where alot of the confusion comes into play. In early CCM versions this was named Cisco IP Telephony Applications Backup Utility (which you will use to migrate 3.2 data) and changed to Cisco IP Telephony Backup and Restore System (BARS) with this CCM version change.
Cisco IP Telephony Applications Backup Utility (version 3.5.x) supports backups of Cisco CallManager versions up to 3.3.x only.
Cisco IP Telephony Applications Backup Utility, Version 3.5.53 (or later), supports CER 1.2(1) and later.
Using Cisco IP Telephony Applications Backup Utility, Version 3.5.52
The CCM 3.2 to 3.3 is a major change that requires alot of planning. We spent many hours in the lab prior to doing this. If you need any documentation let me know I think I still have a step by step that we did up somewhere.
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...