RTP header compression performance study on Cisco routers

This research investigates the CPU processing performance impact when enabling header compression on RTP traffic on Cisco routers. The study was performed in the lab of Stril Networks in 2007.


RTP header compression is a method for reducing traffic bandwidth on links carrying VOIP traffic. However Cisco advises against enabling RTP header compression (cRTP) on link speeds above 1.5Mbps [1]. This paper summarizes a lab test showing cRTP works fine on high bandwidth links and the maximum packet forwarding performance of the router is reduced to roughly half with cRTP enabled.


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