RTP Payload Information

[Justin Ferello]

Hello all,

My customer asked the following question, does anyone have the answer to this?

     "Along with our network operations group, I have been collecting wireshark traces of media generated by Tandberg endpoints varying from C20's, C40's, C90's, MXP's, E20's, and EX90's for the purpose of marking this RTP traffic so it gets prioritized in our CoS maps. From these results, we see that Tandberg media falls under the dynamic RTP payload-type range, which is between 96-127. But these values are different depending on factors such as the particular endpoints, if it's a multi-way/point-to-point call, or if it goes through a bridge.

     While BAH understands that we can mark traffic on the endpoints themselves by setting ToS/DSCP values, we do not favor that solution since any traffic can be marked with those values, and we would also have to rely on correct and updated configs on all endpoints/switches to let these markings go through untouched. We prefer to have our CoS maps rely on an inherent attribute, such as RTP media, to prioritize traffic.

     Please check with them to see if they have anything regarding RTP payload types."

Thank you for your time & consideration,

Justin                   

[gogasca]

cos or dscp values are l2, l3 layer, rtp is l4, rtp payload type is just used used to classify different type of media, audio, video, dtmf etc. I dont have enough info to recommend best qos strategy as only you and your customer know exactly ur network and needs, Your customer needs to classify based on source, either trusting or remarking cos/dscp values as eps have capability to configure cos/dscp values i would focus my qos strategy on this ( example video cs5 audio ef signaling cs3) and from there Assign priorities don't really see adding extra configuration to open up packet and read rtp profiles to provide priority I'd we can mark closest to source and prioritize all the way to destination, our video and tp srnd contains good examples

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