Hi Rajesh,
I was working with someone on a very similar problem back in May 2007 who sucessfully did this type of change;
You should be good to go with this plan. Here is a little added info (just in case);
Replacing the Publisher Database Server After the Installation
To replace an existing or failed server, perform the following steps:
1. Install the operating system and the Cisco CallManager software as if it were a new installation by using the Cisco-provided operating system disks and the operating system documentation.
2. Upgrade to the version of the Cisco CallManager that you want to restore.
3. If necessary, reinstall the Cisco IP telephony applications, plugins, and service releases to the version that is compatible with the restored version of Cisco CallManager.
4. To obtain the locales that were used prior to the restoration, reinstall the Cisco IP Telephony Locale Installer.
5. Restore the backup data to the new server and reboot the server.
To restore the data, you must have backup data stored on tape or on a network directory, not on the local directory of the existing or failed server.
6. Verify that the data was restored to the new server.
7. If you are replacing a server with four drives, Cisco recommends that you set the trace directory path on the server to the default C: drive before you backup your server.
8. If your server has four drives, you can configure the trace drive for trace file collection.
From this doc;
http://www.cisco.com/en/US/products/sw/voicesw/ps556/prod_installation_guide09186a00803f5c57.html#wp534959
May thread;
http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Unified%20Communications%20and%20Video&topic=IP%20Telephony&CommCmd=MB%3Fcmd%3Ddisplay_location%26location%3D.1dde6a72
Hope this helps!
Rob
