Which of the following are key benefits of Cisco CME for customers? (Choose all that apply)

A.
Cisco CME can cluster with CCM to provide redundancy.

B.
Cisco CME can be used to provide call processing for digital phone sets.

C.
Cisco CME hardware such as voice modules can be migrated to a CCM deployment.

D.
Cisco CME can be enabled on an existing Multiservice Access Router with a IOS upgrade.