Wireshark-bugs: [Wireshark-bugs] [Bug 6808] New: VoIP RTP packets incorrectly interpreted as T38

Date: Wed, 8 Feb 2012 05:28:46 -0800 (PST)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6808

           Summary: VoIP RTP packets incorrectly interpreted as T38
                    packets
           Product: Wireshark
           Version: 1.6.5
          Platform: x86
        OS/Version: Windows 7
            Status: NEW
          Severity: Normal
          Priority: Low
         Component: Wireshark
        AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
        ReportedBy: sebastian.zenzerovic@xxxxxxxx


Build Information:
Version 1.6.5 (SVN Rev 40429 from /trunk-1.6)

Copyright 1998-2012 Gerald Combs <gerald@xxxxxxxxxxxxx> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Compiled (32-bit) with GTK+ 2.22.1, with GLib 2.26.1, with WinPcap (version
unknown), with libz 1.2.5, without POSIX capabilities, without libpcre, with
SMI
0.4.8, with c-ares 1.7.1, with Lua 5.1, without Python, with GnuTLS 2.10.3,
with
Gcrypt 1.4.6, with MIT Kerberos, with GeoIP, with PortAudio V19-devel (built
Jan
10 2012), with AirPcap.

Running on 32-bit Windows 7, build 7600, with WinPcap version 4.1.2 (packet.dll
version 4.1.0.2001), based on libpcap version 1.0 branch 1_0_rel0b (20091008),
GnuTLS 2.10.3, Gcrypt 1.4.6, without AirPcap.

Built using Microsoft Visual C++ 9.0 build 21022
--
Hi,

seems that Wireshark incorrectly interprets G711 RTP frames as T38 packets
after unsuccessfull T38 (fax call) renegotiation. In the attached trace,
Wireshark decodes one-way RTP stream successfully but in the opposite direction
G711 RTP packets are wrongly decoded as T38.
If you filter the trace for "t38", save the displayed packets to a new pcap,
open the new pcap and decode the data as RTP you can actually listen / look at
the fax communication.

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