Ethereal-users: RE: [Ethereal-users] Circuit bit stream

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From: "Paul Long" <plong@xxxxxxxxxxx>
Date: Tue, 3 Aug 2004 23:29:59 -0500
Fabrizio,

I don't know Ethereal very well, but I do know H.323 and H.324. H.323, which
Ethereal can decode, uses H.245 and H.263, so I suppose you could
theoretically use Ethereal to decode them after a lot of work putting them
in a form that looks like an H.323 call control channel and RTP video
stream. The problem, though, is that H.324 uses H.223 for multiplexing; in
H.323, the NIC performs this task. Therefore, you would have to extract the
H.245 and H.263 channels from the H.223 bit stream (Ethereal would be no
help here). Not an easy task considering that H.223 uses a very
robust/complicated multiplexing scheme.

This might be useful to others since 3GPP uses H.324M for videoconferencing,
but it would require a lot of work.

Paul

-----Original Message-----
From: ethereal-users-bounces@xxxxxxxxxxxx
[mailto:ethereal-users-bounces@xxxxxxxxxxxx] On Behalf Of
flconsolandi@xxxxxxxxxx
Sent: Tuesday, August 03, 2004 3:58 AM
To: ethereal-users@xxxxxxxxxxxx
Subject: [Ethereal-users] Circuit bit stream

Dear All,
I am trying to analyse the trace of a circuit switched multimedia call
(H.324).
In case I have the synch bit stream from the circuit, can Ethereal decode
H.223, H.245, H.263?
If so, please provide me with information regarding how to set Ethereal
to decode the bit stream got from the circuit (the bit stream is on a E1
link for ISUP connection).


NOTE: IT IS NOT AN IP STREAM.


Thanks and Regards

Fabrizio



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