Correct method to filter an RTP stream

["Keith French" <keithfrench () btconnect com>]

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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