Hi S.Balaji,
Have a look at the info for Extension Mobility for 4.1.3:
Cisco CallManager Extension Mobility and Phone Login Features
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The Cisco CallManager Extension Mobility feature allows users to configure any Cisco IP Phone 7940 or Cisco IP Phone 7960 as their own, on a temporary basis, by logging in to that phone. After a user logs in, the phone adopts the user individual user default device profile information, including line numbers, speed dials, services links, and other user-specific properties of a phone. For example, when user A occupies a desk and logs in to the phone, that user's directory number(s), services, speed dials, and other properties appear on that phone; but when user B uses the same desk at a different time, user B's information appears. The Cisco CallManager Extension Mobility feature dynamically configures a phone according to the current user.
From this doc:
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a00803edae9.html#wp1030809
Hope this helps!
Rob
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