Implementing and Operating Cisco Collaboration Core Technologies (CLCOR) — Question 308

An engineer configures a new phone in Cisco UCM. The phone boots and gels an IP address when it connects to the network, however the phone fails to register with Cisco UCM. The engineer observes that the phone has a status Rejected in Cisco UCM. What must be verified first when troubleshooting the issue?

Answer options

• A. whether auto-registration is enabled in Cisco UCM
• B. whether the phone is in the correct VLAN
• C. whether the Initial Trust List and Certificate Trust List files on the phone are correct
• D. whether the phone’s MAC address is correct in Cisco UCM

Correct answer: C

Explanation

The correct answer is C because the phone's ability to register relies on having the right trust list files. If these files are incorrect, the phone will be rejected regardless of other settings. Options A, B, and D are also important but are secondary to ensuring the trust lists are correct, as they would not directly cause a Rejected status.