In a Centralized Call processing architecture, you have deployed Extension Mobility (EM) feature.
After the deployment of EM, when one of the end-users tries to login to the IP phone, the Error 25 is
displayed on the screen. What three things should you do to resolve this issue? (Choose three.)
A.
upgrade the firmware of the IP Phone to the latest version
B.
activate EM feature service under Cisco Unified Serviceability
C.
associate EM Device profile with the end-user
D.
subscribe the MAC address of the IP Phone to EM Service
E.
update EM Phone Service URL to point to the publisher
F.
subscribe device profile to EM phone service in case the enterprise subscription of EM Service is
disabled