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

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QuestionQ150

Voice Gateways and Session Border Controllers

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Refer to the exhibit. An administrator has configured fax dial peers on a Cisco IOS gateway and discovers that faxes are not operating correctly. Which change should be made to correct the problem?

  • A codec g729br81
  • B codec g723ar63
  • C codec g726r32
  • D codec g711ulaw
Explanation

Cisco IOS fax relay uses T.38 for fax media, and Cisco fax passthrough/fallback requires an uncompressed G.711 codec rather than a compressed codec such as G.729. Configuring G.711 μ-law provides the required voice-media codec for reliable fax operation and T.38 fallback.

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