CLCOR Protocols And Endpoints Practice Question
An endpoint sends a SIP REGISTER request. CUCM returns a 401 Unauthorized response. What is the next logical step in the SIP signaling flow for the endpoint?
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
✓
Resend REGISTER with Authorization header
The 401 response challenges the endpoint to provide credentials (Digest authentication). The endpoint must resend the REGISTER request with the Authorization header.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Switch to SCCP
Why it's wrong here
Switching protocols is not a solution for authentication.
- ✓
Resend REGISTER with Authorization header
Why this is correct
The endpoint must respond to the challenge with credentials.
- ✗
Terminate the TCP connection
Why it's wrong here
This would prevent registration from succeeding.
- ✗
Send a SIP INVITE
Why it's wrong here
Registration must complete before calling.
About these practice questions
This CLCOR question is part of Courseiva's 263-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam 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.