CLCOR Cloud And Hybrid Services Practice Question
A user is unable to receive incoming PSTN calls via a Webex Calling Local Gateway. You observe that the INVITE from the provider reaches the CUBE, but the CUBE sends a 403 Forbidden. What is the most likely cause?
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
✓
The incoming dial peer is missing or misconfigured
A 403 Forbidden on the CUBE usually indicates that the dial-peer or translation pattern does not match the incoming number or that the caller is not authorized based on the configured dial peer settings.
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 PSTN provider is using an unsupported codec
Why it's wrong here
This would likely cause a 488 Not Acceptable Here.
- ✓
The incoming dial peer is missing or misconfigured
Why this is correct
A 403 indicates the CUBE denied the request, typically due to lack of a matching dial-peer.
- ✗
The Webex cloud is unreachable
Why it's wrong here
This would cause a timeout or 503 error.
- ✗
The user's directory number is not in the PSTN white list
Why it's wrong here
CUBE does not use a 'white list' for PSTN numbers.
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.