CLCOR ON Premises Call Control Practice Question
You are troubleshooting a one-way audio issue. The phone can register, but no audio is heard. What should you check first?
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
✓
Network ACLs and port accessibility for RTP.
One-way audio is typically a network connectivity issue, such as blocked RTP ports or an incorrect Media Resource configuration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The phone's directory number.
Why it's wrong here
The DN is for addressing, not audio media.
- ✗
The CSS of the device.
Why it's wrong here
CSS is for routing, not media pathing.
- ✗
The phone's firmware version.
Why it's wrong here
Firmware issues usually affect registration, not just audio.
- ✓
Network ACLs and port accessibility for RTP.
Why this is correct
Blocked media ports often cause one-way audio.
About these practice questions
Courseiva writes every CLCOR question from scratch — 263 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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.