Unified Communications Manager and IM and Presence Service software versions must have the same major and minor release number. Major and minor release numbers are defined as follows:
where 9 = major release number, x = minor release number and y = maintenance release number.
For example, IM and Presence Release 126.96.36.19900-4 is compatible with Unified Communications Manager Release 188.8.131.52000-2, but it is not compatible with Unified Communications Manager Release 184.108.40.20600-3. Similarly, Unified Communications Manager Release 220.127.116.1100-6 is not compatible with IM and Presence Release 18.104.22.16800-9.
The software version of subsequent IM and Presence nodes that you upgrade must match all five version numbers of the first IM and Presence node that you upgraded.
You cannot upgrade IM and Presence unless the upgraded release of Unified Communications Manager is already installed on the active or inactive partition. You must upgrade Unified Communications Manager before you can upgrade IM and Presence to the matching version.
If you use Platform Administrative Web Services (PAWS) Management to upgrade IM and Presence, do not attempt to upgrade and reboot to the current IM and Presence release if the active partition on Unified CM is running an incompatible software version. If you do, the upgrade will fail, as expected, but the failure will not be reported until near the end of the upgrade process. You will also experience system downtime when the system reboots.
The delayed upgrade failure notification applies only to upgrades that are performed with PAWS Management. If you perform the upgrade through Cisco Unified IM and Presence Operating System Administration
or through the CLI, the upgrade failure notification is displayed at the beginning of the upgrade.