CLCOR Voice Gateways And Session Border Controllers Practice Question
A CUBE is receiving calls but rejecting them due to '488 Not Acceptable Here'. What is the most likely reason?
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
✓
Codec mismatch
488 usually indicates a mismatch in media capabilities (codecs or SDP) offered vs what is configured on the dial-peer.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Codec mismatch
Why this is correct
488 indicates an SDP/media negotiation failure.
- ✗
Authentication failure
Why it's wrong here
This would cause a 401 or 407.
- ✗
SIP registration expired
Why it's wrong here
This is not related to 488 errors.
- ✗
Dial-peer inactive
Why it's wrong here
This would cause a 404 or 503.
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.