CLCOR ON Premises Call Control Practice Question
An administrator needs to ensure that internal calls between two sites are routed over an MTP-required SIP trunk, but the calls are failing due to codec mismatch. Which CUCM service parameter setting should be verified to allow the MTP to be inserted?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check the MTP Required checkbox on the SIP trunk configuration and ensure the MRGL includes an MTP resource.
The 'MTP Required' checkbox on the SIP Trunk configuration page must be checked, and the Media Resource Group List (MRGL) must contain an MTP resource associated with the device pool.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the 'Maximum Number of MTP Resources' in the Service Parameters.
Why it's wrong here
This increases capacity but does not solve a failure caused by a lack of MTP insertion.
- ✗
Change the SIP Trunk Security Profile to 'Non-Secure' to bypass encryption negotiation.
Why it's wrong here
Security profiles do not affect codec negotiation or MTP allocation.
- ✓
Check the MTP Required checkbox on the SIP trunk configuration and ensure the MRGL includes an MTP resource.
Why this is correct
Enabling MTP Required forces the CUCM to allocate an MTP resource for the call, resolving codec negotiation issues.
- ✗
Modify the Region settings to force G.711 codec between the two sites.
Why it's wrong here
Changing the region does not force an MTP to be inserted if the trunk is not configured to require one.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Cisco exam blueprint
This CLCOR practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CLCOR exam.