Choose Device > Device Settings > Device Profile and click Add New.
From the drop down list, select the phone model to be configured, for example, Cisco 7960
Enter a Device Profile Name, for example “Your Name” .
From the Phone Button Template field, select Standard 7960 SCCP.
On the left hand side of the screen, click the link Line  – Add a new DN.
Choose a valid DN from your internal dialing plan for the location, enter that DN in the Directory Number field.
Under Route Partition, select your Partition.
Under Directory Number Settings choose a CSS of appropriate access.
Enter any Call Forward and Call Pickup Settings as necessary.
In the Display (Internal Caller ID), enter the User’s name.
From the Related Links: menu, select Subscribe/Unsubscribe Services.
In the Select a Service, select Extension Mobility, then click Next.
Repeat for any additional lines.