Which protocol negotiates media parameters?

Which protocol negotiates media parameters?

• A. SIP
• B. SDP
• C. RTSP
• D. RTP

Answer: (B)

Negotiating media parameters is done with the Session Description Protocol. SDP describes the details of a media session—what type of media (audio, video), the transport to use (for example, RTP), the codecs and their parameters, clock rates, channel counts, ports, and addresses. In practice, parties exchange SDP offers and answers to agree on these settings during session setup (often carried within signaling like SIP). Once both sides agree, RTP streams carry the media with those agreed parameters. The other protocols have different roles: SIP handles signaling, RTSP controls streaming sessions and may reference an SDP description, and RTP is the actual media transport, not the negotiation mechanism. So the best answer is SDP.

Negotiating media parameters is done with the Session Description Protocol. SDP describes the details of a media session—what type of media (audio, video), the transport to use (for example, RTP), the codecs and their parameters, clock rates, channel counts, ports, and addresses. In practice, parties exchange SDP offers and answers to agree on these settings during session setup (often carried within signaling like SIP). Once both sides agree, RTP streams carry the media with those agreed parameters. The other protocols have different roles: SIP handles signaling, RTSP controls streaming sessions and may reference an SDP description, and RTP is the actual media transport, not the negotiation mechanism. So the best answer is SDP.