We have an endpoint which cannot tag outgoing RTP packets as 46 (EF)....

Currently they happily churn out as 0

Can the Cisco switch it is entering, recognise it's RTP traffic and then change the DSCP value to 46 (EF)?

Or, is it only capable of just blanket classification of ingress traffic?

(I only want to mark RTP data, SIP and other protocols can stay as is)

  • What switch or router is it, model?
    – user36472
    Nov 1, 2018 at 13:25
  • Short answer: Yes, depending on the device model and SW version
    – Ron Trunk
    Nov 1, 2018 at 13:26
  • Switch = Cisco 2960 Nov 1, 2018 at 13:28
  • 1
    Unfortunately, questions about networks you don't control are off-topic here.
    – user36472
    Nov 1, 2018 at 13:46
  • 1
    That switch will set everything entering to BE as the default. You must configure it to set the DSCP to something else. Also, simply setting something to EF does nothing unless you have all the network devices configured to do something with the DSCP values, and, by default, they do nothing with DSCP values.
    – Ron Maupin
    Nov 1, 2018 at 14:30


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