Question about filtering

[FS <bastiji () gmail com>]

Greetings!

I'm investigating audio-loss for a VoIP implementation. When I listen to
the RTP stream, I can see that at a certain point in the conversation one
party starts to "not hear" the other side. In other words, one-way audio
muting is happening.

My question is how do I correlate that particular muting which I can deduce
(from one side in question repeating their hellos again and again) in the
stream to a packet-stream in wireshark? So how do I know the point where
the packets start to get lost in the conversation from the side that muted?
(It's a 100 meg capture)

One way I can think of is to go through the capture packet-by-packet and
see where only packets from one side start showing up in the capture, but
is there another more elegant way to do this? Can I write a filter in such
a way that it finds the packets coming only from one side in succession
whereas it should be a to-and-fro that should be reported?

Hoping that I asked the question clearly. If not, please let me know if
more information is needed and/or you know the hidden trick that I seem to
be missing :-)

Thanks,
Basti Ji

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