Wireshark-bugs: [Wireshark-bugs] [Bug 2368] Wireshark decodes all G.711 packets as T. 38 after a SIP reinvite for T.38.

From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Mon, 4 Aug 2008 05:35:43 -0700 (PDT)

https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=2368





--- Comment #4 from LEGO <luis.ontanon@xxxxxxxxx>  2008-08-04 05:35:42 PDT ---
This is a hard one to get it fixed... RTP chooses the subdissector to use based
on what has been learnt by SDP.

The issue here is that here:
 A frame containing SDP changes the subdissector to T.38, and there's no way
for SDP to know that the change was rejected in a later frame.

A mechanism needs to be engineered to allow SIP (and other RTP users) to inform
SDP/RDP that a given description was rejected so it has to go back to the prior
sub_dissector. (This is not easy to do at all).

I do not know which state was t38 at the time of Ethereal 0.10.6 but I guess it
was not there yet. So my guess is that the change of subdissector failed
because no subdissector for T38 is found (this needs to be verified). 

\Lego


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