CLCOR ON Premises Call Control Practice Question
Which protocol is used by IP phones to register with the Cisco Unified Communications Manager?
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
✓
SCCP or SIP
Cisco IP phones use SCCP (Skinny) or SIP to communicate and register with CUCM.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
RTCP
Why it's wrong here
RTCP is for media reporting.
- ✓
SCCP or SIP
Why this is correct
These are the two primary protocols for phone registration.
- ✗
MGCP
Why it's wrong here
MGCP is used for gateways.
- ✗
H.323
Why it's wrong here
H.323 is generally used for gateways.
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.