Refer to the exhibit. 

Cisco Unity Connection and Cisco Unified Communications Manager are integrated by using SCCP. The Voice Mail Ports are registered. Users report that calls fail when forwarded to voicemail. Which is a cause of the issue? 

Answer options:

A. The call forward and call pickup settings do not have a CSS on Forward All.
B. The Voice Mail Port partition on the CSS of the phone is missing.
C. The Voice Mail Pilot is not configured with a CSS that contains the INTERNAL_PT.
D. The CSS on the Voice Mail Pilot is missing partitions for user phones.

D