Hi Sasi,
it is supported but only through PCD, check the link below.
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/upgrade/11_5_1/cucm_b_upgrade-guide-cucm-115/cucm_b_upgrade-guide-cucm-115_chapter_01100.html
Version Requirements
All servers in a cluster must run the same release of Cisco Unified Communications Manager. The only exception is during a cluster software upgrade, during which a temporary mismatch is allowed.
If you are installing IM and Presence nodes, the software version of the first IM and Presence node (the IM and Presence database publisher node) must match the first two numbers of the software version installed on the Unified Communications Manager publisher node. For example, IM and Presence Service software version 11.0.1.10000-1 is compatible with Cisco Unified Communications Manager software version 11.0.1.30000-2.
After you install the first IM and Presence node, the software version of any IM and Presence subscriber nodes that you install must match all five version numbers of the first IM and Presence node.
For example, if the IM and Presence database publisher node is at version 11.5.1.10000-1, then all IM and Presence subscriber nodes must also be 11.5.1.10000-1.
Supported Upgrade and Migration Paths
Use the tables below to determine whether you can upgrade or migrate from your currently installed version, and which of the supported upgrade methods are available to you:
-
direct upgrades using either the Unified CM OS Admin interface or the Cisco Prime Collaboration Deployment (PCD) Upgrade task
-
migrations using the PCD Migration task
If an upgrade or migration from your current release is not supported, see the instructions in the section Upgrading from Legacy Releases.
Applications Installed on MCS Hardware
Applications Installed on Cisco Media Convergence Server (MCS) 7800 Series Hardware
You cannot install or run Cisco Unified Communications Manager and the IM and Presence Service directly on server hardware; you must run these applications on virtual machines. The tables below list the supported migration paths for deployments that are currently running on MCS hardware. All of the supported migration paths listed below are physical-to-virtual (P2V) migrations.
 Note |
The tables below list the upgrade paths supported for MCS 7800 Series servers, with the following exceptions: PCD migrations are not supported for BE3000 and BE5000 deployments. We recommend a fresh installation for upgrades from these products. |
|
From |
To |
Supported Method |
|---|---|---|
|
6.1(5) |
11.5(1) |
PCD Migration |
|
7.1(3) and 7.1(5) |
11.5(1) |
PCD Migration |
|
8.x |
11.5(1) |
PCD Migration |
|
9.x |
11.5(1) |
PCD Migration |
|
From |
To |
Supported Method |
|---|---|---|
|
CUP 8.5(4) |
11.5(1) |
PCD Migration |
|
CUP 8.6(3), 8.6(4), and 8.6(5) |
11.5(1) |
PCD Migration |
|
IM and Presence 9.x |
11.5(1) |
PCD Migration |
Applications Installed on Virtual Machines
Applications Installed on Virtual Machines
The tables below list the supported upgrade and migration paths for deployments that are currently running on virtual machines. All of the supported upgrade and migration paths listed below are virtual-to-virtual (V2V).
|
From |
To |
Supported Method |
|---|---|---|
|
8.6(x) |
11.5(1) |
Unified CM OS Admin PCD Migration or PCD Upgrade |
|
9.x |
11.5(1) |
PCD Migration or PCD Upgrade |
|
9.1(x) |
11.5(1) |
Unified CM OS Admin |
|
10.0(x) |
11.5(1) |
PCD Migration or PCD Upgrade |
|
10.5(x) |
11.5(1) |
Unified CM OS Admin |
|
11.0(1) |
11.5(1) |
Unified CM OS Admin PCD Migration or PCD Upgrade |
JB
