![]() If you upgraded from Cisco CallManager 3.3, refer to Cisco IP Telephony Backup and Restore System (BARS) Administration Guide at.If upgraded from Cisco CallManager 3.2, refer to Using Cisco IP Telephony Applications Backup Utility, Version 3.5.52 (or later) at.For a list of files that the utility backs up, refer to the appropriate backup documentation: This procedure assumes that you have a good backup file on a tape device or network directory. In the unlikely event of an upgrade failure, or if you prefer an earlier version of Cisco CallManager, perform the following steps to return the Cisco IP Telephony Applications Server to the configuration that was in effect prior to the upgrade. Reverting Upgraded Cisco IP Telephony Applications After You Revert Cisco CallManager Reverting the Hard Drive After Drive Mirroring Completes ![]() Reconfiguring If You Removed a Drive Before the Upgrade Reconfiguring If You Did Not Remove a Drive Before the Upgrade Reverting to the Previous Configuration After an Upgrade Attempt
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