[SIPForum-discussion] Confused with RTP analysis function in Ethereal, please help!

[aditi g]

Hi
Jitter measurement in wireshark shows the effect that causes bad voice
quality due to the variation in packet arrivals at the recieving
end.Acceptable jitter values are upto 40 ms ,if jitter exceeds 40 ms then
poor voice quality can be apprended.

Also delta is time interval between 2 packets which is apprx 20 ms.
If you sort packets in "RTP Analysis: window by Seq no ,you will be able to
see packetization interval
of appx 20 ms which is Delta in this case.

Thanks
Pallavi




On 3/21/07, Adam Harding <adam.harding2 at ntlworld.com> wrote:
>
> Hi,
>
> This is more of an ethereal/wireshark question but is related to SIP as I
> am trying to analyse SIP calls:
>
> Please could someone help me as I am quite confused!
>
> What does "Delta" mean in the RTP analysis and how is it calculated?
>
> In the RTP graph analysis, what does the red line indicating "Difference"
> mean and how is it calculated?
>
> I thought the "difference" on the graph was giving the Delta results in
> graph format but the results on the graph are different and lower than the
> Delta values.
>
> I am doing my final year project on VOIP and looking into how different
> network conditions effect the call quality.
>
> What measurement in wireshark should I be looking at to show the effect
> that causes bad voice quality due to the variation in packet arrivals at the
> recieving end?
>
> Any help would be great as I am very confused!
>
> Thanks.
>
> Adam.
>
>
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