Implementing Cisco Collaboration Devices (CICD, legacy) — Question 5

Which Cisco Unified Communications Manager configuration causes an IP phone screen to display a "registration rejected" message?

Answer options

• A. Cisco Unified Communications Manager is unable to reach user IP phone.
• B. Cisco Unified Communications Manager database replication status is 2.
• C. Cisco Unified Communications Manager auto registration is disabled.
• D. Cisco Unified Communications Manager is unable to allocate DN.
• E. Cisco Unified Communications Manager subscriber is offline.

Correct answer: D

Explanation

The correct answer is D because if Cisco Unified Communications Manager is unable to allocate a Directory Number (DN) to the IP phone, it will not be able to register it, resulting in a 'registration rejected' message. The other options may indicate various issues but do not directly cause a registration rejection related to DN allocation.