I followed the bellow referred by some one
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Task 1: Verify Extension Mobility Service is Running
Step 1 From the Navigation menu select Cisco Unified CallManager Serviceability
Step 2 Select Tools>Control Center – Feature Services
Step 3 Make sure that the Cisco Extension Mobility service shows status Activated
Task 2:Configure Extension Mobility Service
Step 1 From the Navigation menu select Cisco Unified CallManager Administration
Step 2 Select Device>Device Settings>Phone Services
Step 3 Click Add New
Step 4 In the Service Name field, type Extension Mobility
Step 5 In the Service Description field, type Login and logout service
Step 6 In the Service URL field, Enter the following URL: http://192.168.1.20/...ce=#DEVICENAME#
Step 7 Click Save
Task 3: Modify Enterprise Parameters to Reflect IP Address of CallManager
Step 1 Select System>Enterprise Parameters
Step 2 Under Phone URL parameters, change to 192.168.1.20. Change ONLY the host name, not the rest of the fields.
Step 3 Click Save
Step 4 Click Ok from the pop-up warning.
Step 5 Click Reset
Step 6 In the pop-up window select Reset
Step 7 Click Close
Task 4: Create Device Profile Default for Each Phone Model that shall Support Cisco Extension Mobility
Step 1 Select Device>Device Settings>Default Device Profile
Step 2 From the drop down list, select the phone model to be configured, for example, Cisco 7961.
Step 3 Under Description, enter a description of this profile.
Step 4 Under Phone Button Template, select Standard 7961 SCCP.
Step 5 Click Save
Step 6 Repeat for each model phone to be configured
Task 5: Create Device User Profile for a User
Step 1 Choose Device>Device Settings>Device Profile and click Add New.
Step 2 From the drop down list, select the phone model to be configured, for example, Cisco 7961
Step 3 Click Next
Step 4 Enter a Device Profile Name, for example “Your Name” .
Step 5 From the Phone Button Template field, select Standard 7961 SCCP.
Step 6 Click Save.
Step 7 On the left hand side of the screen, click the link Line [1] – Add a new DN.
Step 8 Choose a valid DN from your NIP, enter that DN in the Directory Number field.
Step 9 Under Route Partition, select your city’s Headquarters Partition.
Step 10 Under Directory Number Settings choose a CSS of appropriate access.
Step 11 Enter any Call Forward and Call Pickup Settings as necessary.
Step 12 In the Display (Internal Caller ID), enter the User’s name that was created in a previous Lab.
Step 13 Click Save.
Step 14 From the Related Links: menu, select Subscribe/Unsubscribe Services.
Step 15 In the Select a Service, select Extension Mobility, then click Next.
Step 16 Click Subscribe.
Step 17 Click Save.
Step 18 Repeat steps 7-13 for any additional lines.
Task 6: Associate User Device Profile to a User
Step 1 From the menu, select User Management>End User.
Step 2 Click Find
Step 3 Select the user from the list that matches the profile that was created.
Step 4 Under Extension Mobility>Available Profiles, select the profile that was created in the previous exercise and move it to the Controlled Profiles selection.
Step 5 Under Default Profile, select the profile.
Step 6 Click Save.
Task 7: Configure and Subscribe Cisco Unified IP Phones to Service and Enable it.
Step 1 Select Device>Phone from the menu.
Step 2 Select the phone from the list of devices.
Step 3 In the Related Links: field, select Subscribe/Unsubscribe Services and click Go
Step 4 In the pop-up window, under Service Information, in the Select a Service pull down menu, select Extension Mobility.
Step 5 Click Next
Step 6 Click Subscribe
Step 7 Click Save
Step 8 Close the pop-up window.
Step 9 Under Extension Information , check the Enable Extension Mobility box.
Step 10 Under the Logout Profile field, select – Use Current Device Settings –
Step 11 Click Save.
Step 12 Click Ok from the pop-up warning.
Step 13 Click Reset
Step 14 In the pop-up window select Reset.
Step 15 Click Close.
