Wireshark-bugs: [Wireshark-bugs] [Bug 5220] New: Wrong SDP interpretation on VoIP call flow char
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Thu, 16 Sep 2010 05:03:03 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5220

           Summary: Wrong SDP interpretation on VoIP call flow chart
           Product: Wireshark
           Version: 1.4.0
          Platform: x86
        OS/Version: Windows XP
            Status: NEW
          Severity: Normal
          Priority: Low
         Component: Wireshark
        AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
        ReportedBy: somsom.great@xxxxxxxxx


Build Information:
Version 1.4.0 (SVN Rev 34005 from /trunk-1.4)
Bug also present in 1.2.x series.
--
Open attachment 4409
(https://bugs.wireshark.org/bugzilla/attachment.cgi?id=4409) of bug 4586
(https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=4586). Click on
Telephony/VoIP Calls/Flow.

SDP answer of 1st reINVITE is decoded as "200 OK SDP ( t38 g711A )". That is
incorrect, as audio media, which seemingly contains g711A is deleted. Therefore
g711A should not be shown, at all.

Deleting a media is defined in RFC3264, it is actually done by setting port
number of media to zero.

The log I refer to is about a D-Link box. In real life I encountered the same
issue using products of several other vendors. I just did not want to attach
another log, when an existing one is sufficient.

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