Cisco
210-060 · Question #377
210-060 Question #377: Real Exam Question with Answer & Explanation
The correct answer is C: passing call setup and teardown messages between the IP phone and the Cisco Unified. SCCP is a lightweight client-server signaling protocol that carries call control messages between a Cisco IP phone and CUCM, and does not transport voice media.
Question
Two users have IP phones running SCCP phone loads. Which purpose does the SCCP protocol server during the call?
Options
- Adigitizing, sampling, and transmitting one user's analog voice to the Cisco Unified Communications
- Bdigitizing, sampling, and transmitting one user's analog voice to the other user's IP phone
- Cpassing call setup and teardown messages between the IP phone and the Cisco Unified
- Dpassing call setup and teardown messages between the two phones
Explanation
SCCP is a lightweight client-server signaling protocol that carries call control messages between a Cisco IP phone and CUCM, and does not transport voice media.
Common mistakes.
- A. Digitizing and sampling analog voice is performed by the IP phone's onboard DSP, and the resulting audio is transmitted via RTP/UDP, not through SCCP to CUCM.
- B. Voice media travels directly between IP phones using RTP/UDP; SCCP carries only signaling messages and never transports audio streams.
- D. SCCP is a client-server protocol where each phone communicates individually with CUCM, not with the other phone directly - peer-to-peer signaling between phones is not part of how SCCP functions.
Concept tested. SCCP signaling role versus RTP media transport
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