Wireshark-users: Re: [Wireshark-users] Correct method to filter an RTP stream
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From: "Keith French" <keithfrench@xxxxxxxxxxxxx>
Date: Wed, 23 Dec 2009 11:22:53 -0000
I have further found a difference in the number of frames displayed by the two filter methods on my problematic trace.
 
rtp.setup-frame returns 4363 frames
 
SSID returns 5770
 
If I then do a "Show all streams" on the whole trace, all streams share the same SSID:-
 
 
Obviously looking at the first two streams, I can see where the packet loss is coming from when I filter on the SSID. Before I think of going any further with it I would appreciate some guidance on which filter method I should use.
 
Keith French.
 

Sent: Wednesday, December 23, 2009 10:15 AM
Subject: [Wireshark-users] Correct method to filter an RTP stream

I am running Wireshark V 1.2.5 on Windows 7 and I have a question on what is the correct method to find all packets in an RTP stream from a trace that has multiple H.323 calls in it.
 
I use "VoIP Calls" and highlight the call I am interested in and click "Prepare Filter". This will give one or maybe a few RTP packets.
 
Originally I thought that the correct method was to use the RTP setup frame :-
 
rtp.setup-frame == 4
 
However, I was advised by someone that I should use the RTP SSID:-
 
rtp.ssrc == 0xb1854be7
 
I have a trace where if I filter on the SSID I get 95% RTP packet loss, but if I filter on it via the RTP setup frame, I get 0% RTP packet loss.
 
Which method should I be using?
 
Keith French

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