Ethereal-users: Re: [Ethereal-users] asn1

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From: "Martin Regner" <martin.regner@xxxxxxxxx>
Date: Fri, 31 Oct 2003 19:19:51 +0100
Preeti Gopalan wrote:

>How can I view the Q931 and H225 messages? on screen all I see is what is
>int he attachment here .


Normally H.225/H.245 decoding is working automatically with Ethereal 0.9.15.

However you may need to configure Ethereal to handle TCP desegmentation:
Edit/Preferences.../Protocols/TCP/Allow subdissector to desegment TCP streams  (x)  checked
Edit/Preferences.../protocols/H225/Reassemble H.225 over TCP (x) checked
Edit/Preferences.../protocols/TPKT/Desegment all TPKT messages spanning multiple TCP segments (x) checked

There could also be some kind of port number conflict with another protocol, or some other problem.

Unfortunately I cannot see why you don't seem to get the decoding to work.

Can you send a sample capture of the packet?

You could also try to to load the rtp_example.raw.gz from the Ethreal site. It contains an example VoIP call with H.225, RTP etc.
http://www.ethereal.com/sample/