Acme Corporation has Cisco IP Phones configured in a single-site Cisco Unified Communications Manager cluster. The 10 phones in the accounting department can call each other. Another 10 phones in the finance department can call each other. However, no phones in accounting can call the phones in finance.
Which change is needed to allow all accounting phones to call all finance phones?
A. Ensure that all phones use SIP signaling.
B. Ensure that all phones use SCCP signaling.
C. Ensure that all phones are the same Cisco IP Phone model.
D. Ensure that all accounting phones are in a CSS that contains the partition that includes the finance phones.
E. Ensure that all finance phones are in a CSS that is in a partition that includes the accounting phones.
