Hi Abishek,

This setup requires a few steps :) The references are in the docs below.

Create Line Group - that contains the User phones to be included in the Hunt Group.

Create Hunt pilot - The Pilot number of the Hunt Group

Create Hunt List - that contains the required Line Group

Hunt Pilot Configuration

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/5_0_1/ccmcfg/b03htpil.html

Line Group Configuration

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/5_0_1/ccmcfg/b03lngrp.html

Hunt List Configuration

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/5_0_1/ccmcfg/b03htlst.html

Hope this helps!

Rob