Hi Koushal
You can install your CUCM on ESXi and clone it. Now using Clone technology of vmware , you can clone it which will create new virtual machine. Now using CUCM ip address/hostname change procedure you can do the required changes.
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/install/6_1_2/ipchange/ipchg612.html
Regards
Ronak Patel
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Regards
Ronak Patel
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