Hi Slava,
This is most possible :) Here is some related information;
Upgrading to Cisco Unified Communications Manager Release 6.1(1)
Starting with Cisco Unified Communications Manager version 6.1(1), CAPF uses the Certificate Manager Infrastructure to manage its certificates and keys. Because of this, when you upgrade to version 6.1(1) or higher, CAPF keys and certificates automatically get regenerated. You must then rerun the CTL Client application to upgrade the CTL file. For information on using CAPF with Cisco Unified Communications Manager, refer to the Cisco Unified Communications Manager Security Guide.
Obtain licenses for Cisco Unified Communications Manager 6.1(1) before upgrading to this release. You must import your new licenses after upgrading to enable the system. Refer to Cisco Unified Communications Manager Administration Guide for information about licensing and obtaining licenses.
Obtaining the Upgrade File
Before you begin the upgrade process, you must obtain the appropriate upgrade file from Cisco.com.
If you are upgrading from Cisco Unified Communications Manager release 5.x, the upgrade file name has the following format:
cisco-ipt-k9-patchX.X.X.X-X.tar.gz.sgn
Where X.X.X.X-X represents the release and build number.
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Note Do not rename the patch file before you install it because the system will not recognize it as a valid file.
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Note Do not unzip or untar the file. If you do, the system may not be able to read the upgrade files.
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If you are upgrading from Cisco Unified Communications Manager release 6.x, the upgrade file has the extension sgn.iso.
You can access the upgrade file during the installation process from either a local disk (CD or DVD) or from a remote FTP or TFTP server.
From this excellent doc;
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/cucos/6_1_1/cucos/iptpch7.html#wp1052939
Hope this helps!
Rob
