[cisco-voip] General QOS question

[ash AD]

Jason, 
   
      Trunking is not required to set QoS DSCP or COS settings. Those markings are not found in the ISL or 802.1q header; they are found in the ToS byte of the IP header. When Cisco IP phones encapsulate the voice bearer traffic within the IP packet they set the ToS byte by default to the EF QoS value. Most people allow Cisco switches to trust this value and not remark the VoIP packet. 
   
  Peter

"Wydra, Jason" <jwydra at Burwood.com> wrote:
                If you don’t turn on trunking for an IP phone switch interface, then how is COS set and/or recognized on ingress?
   
  Jason Wydra
  Consultant
  burwood group, inc.
  Phone: (312) 327-4677
  Cell: (312) 493-2834
  jwydra at burwood.com
   
   

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