Cisco 400-051 Exam

Which two VoIP protocols use SDP to describe streaming media sessions? (Choose two.)

  • A. SCCP
  • B. H.323
  • C. SIP
  • D. MGCP
  • E. RAS
  • F. cRTP
Answer: Option C. D.

The Session Description Protocol (SDP), defined in RFC 2327, describes the content of sessions, including telephony, Internet radio, and multimedia applications. SDP includes information about [8]:
Media streams: A session can include multiple streams of differing content. SDP currently defines audio, video, data, control, and application as stream types, similar to the MIME types used for Internet mail.
Addresses: SDP indicates the destination addresses, which may be a multicast address, for a media stream.
Ports: For each stream, the UDP port numbers for sending and receiving are specified.
Payload types: For each media stream type in use (for example, telephony), the payload type indicates the media formats that can be used during the session.
Start and stop times: These apply to broadcast sessions, for example, a television or radio program. The start, stop, and repeat times of the session are indicated.
Originator: For broadcast sessions, the originator is specified, with contact information. This may be useful if a receiver encounters technical difficulties.

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