Wondering which signaling protocol Cisco IP phones use by default with Cisco Unified Communications Manager (CUCM)? Get a clear explanation of SIP, SCCP, and protocol selection for the Cisco Certified Field Technician (CCT) exam.
Table of Contents
Question
What is the default signaling protocol used by Cisco IP phones registered to CUCM?
A. SIP
B. H.323
C. MGCP
D. IAX
E. RTP
Answer
A. SIP
Explanation
SIP (Session Initiation Protocol) is the default signaling protocol for Cisco Unified Communications Manager (CUCM), handling call setup and teardown.
The default signaling protocol used by Cisco IP phones registered to Cisco Unified Communications Manager (CUCM) is SCCP (Skinny Client Control Protocol), not SIP. SCCP is a Cisco proprietary protocol designed specifically for communication between Cisco IP phones and CUCM, providing device registration, call setup, teardown, and feature control.
While CUCM supports multiple signaling protocols—including SIP, SCCP, MGCP, and H.323—most Cisco IP phones are configured to use SCCP by default unless they are specifically provisioned for SIP. SIP is widely supported and increasingly common, but SCCP remains the default for many Cisco IP phone models and deployments.
SCCP is the default protocol for Cisco IP phones registering to CUCM, handling signaling and device control. SIP is supported and can be configured, but it is not the default protocol for most Cisco IP phones with CUCM.
Cisco Certified Field Technician (CCT) certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the Cisco Certified Field Technician (CCT) exam and earn Cisco Certified Field Technician (CCT) certification.