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QoS Requirements and Recommendations for Voice (Bearer Traffic)

10/31/2011 By Andrew Roderos Leave a Comment

Key QoS requirements and recommendations for voice (bearer traffic):

  • Voice traffic should be marked to DSCP EF per the QoS Baseline and RFC 3246.
  • Loss should be no more  than 1 percent.
  • One-way latency (mouth to ear) should be no more than 150 ms.
  • Average one-way jitter should be targeted at less than 30 ms.
  • A range of 21 to 320 Kbps of guaranteed priority bandwidth is required per call (depending on the sampling rate, the VoIP codec, and Layer 2 media overhead).

Reference

End-To-End QoS Network Design: Quality of Service in LANs, WANs, and VPNs

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Filed Under: QoS Tagged With: Cisco, IOS

About Andrew Roderos

I am a network security engineer with a passion for networking and security. Follow me on Twitter, LinkedIn, and Instagram.

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