Ethereal-users: Re: [Ethereal-users] RTP and jitter

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From: "Lars Ruoff" <Lars.Ruoff@xxxxxxxxxx>
Date: Thu, 6 Apr 2006 17:07:55 +0200
Jitter is calculated with a floating average over the last 16 packets or so.
See RTP/RTCP protocol RFC for definition on how jitter is calculated.
If you have a doubt about the correct calculation, verify it yourself or
send us a capture file.

Lars

----- Original Message ----- 
From: "Michael Mendoza" <michaelux@xxxxxxxxx>
To: <ethereal-users@xxxxxxxxxxxx>
Sent: Thursday, April 06, 2006 4:46 PM
Subject: [Ethereal-users] RTP and jitter


I use ethereal for analysis of VoIP and RTP traffic, but some times I
see than the jitter is too low,about 0.1   0.25 ms, this is  for
almost every packet  but there are some than have 4 ms 16 ms  but only
a few, is it normal�?  but the delta or delay is very stable almost
all the packets are on 20.17 ms, 20.5 ms, 20.52 ms...But in the other
PC the jitter of almost every packet is around 20 ms but the delta is
not constant, somtimes 20 ms , other 40 ms...

Is normal that?
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