350-801 CLCOR: Implementing and Operating Cisco Collaboration Core TechnologiesDemo

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QuestionQ77

Media and QoS

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Refer to the exhibit. An engineer needs to provide a codec list based on the media attribute in an SDP body snippet. Which codecs are included in the media attribute, in priority order?

  • A G.711ulaw, G.722, G.711alaw, and G.729
  • B G.711alaw, G.711ulaw, G.729, and G.722
  • C G.722, G.711alaw, G.729, and G.711ulaw
  • D G.711ulaw, G.711alaw, G.722, and G.729
Explanation

The m=audio media attribute lists RTP payload types in preference order: 0 8 9 18. The static RTP payload mappings are 0 = PCMU (G.711 µ-law), 8 = PCMA (G.711 A-law), 9 = G.722, and 18 = G.729.

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