RTP protocol used in VoIP, which are true? (Select 4 Answers)

Question

Options

• Asolve the out-of-order of packet transmission
• Brestrain echo
• Celiminate jitter problems in IP network transmission
• Dtypes of codec instructions
• Emute transfer instructions

• A
  79% (19)
• B
  21% (5)

Explanation

RTP's header contains a sequence number field that detects and reorders out-of-order packets (A), and a timestamp field that enables jitter buffering at the receiver to smooth irregular packet arrival (C). The Payload Type (PT) field in the RTP header identifies which codec is in use (e.g., G.711, G.729), making D correct, and RTP supports silence suppression and comfort noise (CN packets, RFC 4733), which covers mute/silence transfer signaling (E). Option B is wrong because echo cancellation is handled at the audio processing layer by separate algorithms (e.g., ITU-T G.168), not by the transport protocol itself - RTP simply carries the audio stream without any awareness of acoustic echo.

Memory tip: Remember that RTP is a transport protocol - it handles delivery mechanics (ordering, timing, codec labeling, silence). Echo is an audio quality problem solved before the audio even enters RTP; if it's not in the packet header or payload structure, RTP doesn't do it. The one option that describes a physical/acoustic problem (echo) is always the distractor.

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