Q931 over TCP

"Mike Ollington" <[email protected]>
Newsgroups gmane.network.ethereal.user
Message-ID <000001c6a57f$74bbc450$0701a8c0@mikexp>
Hello,
 
I have a capture with 802.1q VLAN tags taken between an Avaya IP handset and
an Avaya Call Manager and I'm trying to understand call setup.  I presumed
this was H323 (tcp 1720) and tried the two `decode as' options only to
produce nonsense and assumed that it was proprietory.
 
By chance, I opened the same trace in Wildpackets Omnipeek, which identified
the traffic as TPKT and Q931 and within this I could see call setup data.
When I attempt to `decode as' the traffic as TPKT, Ethereal doesn't realise
there is Q931 in there with the info showing an unknown TPDU type (0x0).
 
Am I doing something wrong?  Is there a way to decode directly as Q931
rather than relying on the TPKT dissector to work it out?
 
Thanks,
Mike

-- 
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.394 / Virus Database: 268.9.10/385 - Release Date: 11/07/2006

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