In order for end users to be able to use the Extension Mobility feature, they must first add the IP Phone Service to their device and device profiles. Additionally, we will have to associate said device profile to the end user's account.
This recipe assumes the Cisco Extension Mobility Service has been activated and the IP Phone Service created.
To configure Extension Mobility, so the end user may use it, perform the following:
First we will configure the device to support Extension Mobility.
Navigate to the device on which we will enable Extension Mobility (Device | Phone).
Under the section Extension Information, check Enable Extension Mobility.
Click on Save.
On the top-right corner, under the Related Links drop-down, select Subscribe/Unsubscribe Services:
Click on Go.
Select the appropriate IP Phone Service from the Select a Service...