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

[Adam Harding]

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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