210-060 · Question #299
Two users have IP phones running SCCP phone loads. Which purpose does the SCCP protocol serve during the call?
The correct answer is C. passing call setup and teardown messages between the IP phone and the Cisco Unified. SCCP is a signaling protocol that manages call control messaging between Cisco IP phones and CUCM, not the transport of media.
Question
Two users have IP phones running SCCP phone loads. Which purpose does the SCCP protocol serve during the call?
Options
- Adigitizing, sampling, and transmitting one user's analog voice to the Cisco Unified
- Bsubscriber digitizing, sampling, and transmitting one user's analog voice to the other user's IP
- Cpassing call setup and teardown messages between the IP phone and the Cisco Unified
- Dsubscriber passing call setup and teardown messages between the two phones
How the community answered
(36 responses)- A6% (2)
- B3% (1)
- C89% (32)
- D3% (1)
Why each option
SCCP is a signaling protocol that manages call control messaging between Cisco IP phones and CUCM, not the transport of media.
Digitizing, sampling, and transmitting voice is performed by the DSP and RTP stack on the phone itself, not by SCCP.
RTP carries encoded audio between endpoints; SCCP has no role in transporting voice samples from one subscriber to another.
SCCP (Skinny Client Control Protocol) operates between the IP phone and Cisco Unified Communications Manager to exchange call control messages such as off-hook events, digit collection, call setup, ringing, and call teardown. The actual voice media is carried separately by RTP directly between endpoints.
SCCP messages flow between each phone and the CUCM server, not peer-to-peer directly between the two IP phones.
Concept tested: SCCP protocol role in VoIP call signaling
Source: https://www.cisco.com/c/en/us/products/collateral/unified-communications/unified-communications-manager-callmanager/prod_white_paper0900aecd80394b5d.html
Topics
Community Discussion
No community discussion yet for this question.