Cisco Extension Mobility is a feature that allows users to use different IP Phones as their own by simple logging in process. This is possible by applying different device profile configurations when a user logs in.
STEP 1: VERIFY EXTENSION MOBILITY SERVICE IS RUNNING:
Note: There can be a scenario where multiple call managers are being used to register phones, however, the Cisco Extension Mobility Service is not active on all servers. Watch out for this.
Make sure that the Cisco Extension Mobility service shows status Activated
STEP 2: CONFIGURE EXTENSION MOBILITY SERVICE:
STEP 3: MODIFY ENTERPRISE PARAMETERS TO REFLECT IP ADDRESS OF CALL MANAGER:
STEP 4: CREATE A DEVICE PROFILE DEFAULT FOR EACH PHONE MODEL:
STEP 5: CREATE DEVICE USER PROFILE FOR A USER
STEP 6: ASSOCIATE USER DEVICE PROFILE TO A USER
STEP 7: CONFIGURE AND SUBSCRIBE CISCO UNIFIED IP PHONES TO SERVICE AND ENABLE