[SIPForum-discussion] RTP skew and delta

VAMBARA, SAMPATH (SAMPATH)** CTR ** sampath.vambara at alcatel-lucent.com
Thu Sep 1 06:40:33 UTC 2011

Hi Raghul,

I am not sure how to put it in words but below is an example to calculate skew.

If the packet rate should be 100packets/sec and 1000 packets have arrived in some 10.04 seconds. I mean the 1000th packet has arrived at 10.04th second then the skew value would be -40msec. and if the 1000th packet arrives in 9.96 seconds then the skew value will be +40msec.
And Delta is the time difference between the current packet and the previous packet in the stream.

From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Raghul Prasanna
Sent: Wednesday, August 31, 2011 8:52 PM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] RTP skew and delta

HI All,

Can anyone explain how skew and delta is calculated in a rtp stream please?

wireshark displays them when we do rtp stream analysis, but i cant figure out how this is done.


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