Which of the following statements is CORRECT about signaling and media streams on U1900?

Question

Options

• ASignaling streams are generated at the time when a call is set up or ends. During the call, no
• BIn audio calls, the media streams carry the audio media.
• CDuring an audio call, no media streams are generated when two parties in the call do not speak.
• DSignaling streams and media streams are generated in pairs. This means that when a signaling

• A
  8% (3)
• B
  85% (33)
• C
  3% (1)
• D
  5% (2)

Explanation

Option B is correct because media streams - carried by protocols like RTP - are the transport mechanism for actual audio data during a call; this is a foundational principle of VoIP/UC systems like the U1900.

Why the distractors are wrong:

• A is incorrect because signaling is not limited to call setup and teardown - mid-call events like hold, transfer, and re-negotiation also generate signaling messages.
• C is incorrect because media streams (RTP) flow continuously throughout the call regardless of silence; even quiet periods produce RTP packets (e.g., comfort noise or silence suppression packets), so the stream never fully stops.
• D is incorrect because signaling and media streams are not generated in strict 1:1 pairs - a single signaling session can manage multiple independent media streams (e.g., audio + video), and their lifecycles are separate.

Memory tip: Think of it as a phone call analogy - signaling is the dialing and hanging up (control), while media is your actual voice (content). The media stream is always the carrier of real audio, making B the definitionally true statement no matter the system.

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