Cisco
210-060 · Question #153
210-060 Question #153: Real Exam Question with Answer & Explanation
The correct answer is C: delete the CTL file from each phone manually. When moving Cisco IP phones between CUCM clusters, the Certificate Trust List (CTL) file from the old cluster prevents phones from trusting and registering to the new cluster and must be deleted manually.
Question
A voice engineer is moving an IP phone from one secure Cisco Unified Communications Manager cluster to another. The phones are not registering to the new cluster. Which task resolves this issue?
Options
- Areset the phones
- Brestart the phones
- Cdelete the CTL file from each phone manually
- Duse the Bulk Administration Tool to import the phones
Explanation
When moving Cisco IP phones between CUCM clusters, the Certificate Trust List (CTL) file from the old cluster prevents phones from trusting and registering to the new cluster and must be deleted manually.
Common mistakes.
- A. Resetting a phone restores factory defaults but does not specifically target or remove the CTL file, so the cluster trust mismatch that is blocking registration persists.
- B. Restarting the phone reloads its current configuration from flash memory but does not delete the old cluster's CTL file, leaving the root cause of the registration failure unresolved.
- D. Importing phones via the Bulk Administration Tool adds records to the new cluster's database, but the phones still hold the old CTL file locally and will refuse to register until that file is cleared.
Concept tested. CTL file removal when migrating IP phones between CUCM clusters
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