Wireshark-bugs: [Wireshark-bugs] [Bug 6326] New: Parse T.30 PPR (partial page request) and show
Date: Fri, 9 Sep 2011 05:54:07 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6326

           Summary: Parse T.30 PPR (partial page request) and show
                    requested frames
           Product: Wireshark
           Version: 1.6.2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Enhancement
          Priority: Low
         Component: Wireshark
        AssignedTo: [email protected]
        ReportedBy: [email protected]


Build Information:
Version 1.6.2

Copyright 1998-2011 Gerald Combs <[email protected]> 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 (64-bit) with GTK+ 2.24.4, with GLib 2.28.8, with libpcap 1.1.1, with
libz 1.2.5, with POSIX capabilities (Linux), without libpcre, without SMI, with
c-ares 1.7.4, without Lua, without Python, with GnuTLS 2.10.5, with Gcrypt
1.4.6, with MIT Kerberos, without GeoIP, with PortAudio V19-devel (built May  5
2011 12:46:03), without AirPcap.

Running on Linux 2.6.38.8-32.fc15.x86_64, with libpcap version 1.1.1, with libz
1.2.5, GnuTLS 2.10.5, Gcrypt 1.4.6.

Built using gcc 4.6.0 20110603 (Red Hat 4.6.0-10).
--
Hi,

When using ECM (error correction mode), a fax receiver can respond with a PPR
(partial page request) to the sender's PPS (partial page signal). With the PPR
the are able to request individual frames of the block that was just received. 

As of Wireshark 1.6.2, no information about how many or which frames are
requested is shown. I added this to the t30 dissector.

- packet list
before:
... T.38    UDP: UDPTLPacket Seq=00582  data:v21: hdlc-fcs-OK-sig-end (HDLC
Reassembled: PPR - Partial Page Request)
after:
... T.38    UDP: UDPTLPacket Seq=00582  data:v21: hdlc-fcs-OK-sig-end (HDLC
Reassembled: PPR - Partial Page Request - 5 frames)

- packet details
before:
+ITU-T Recommendation T.30
  ...
  Facsimile Control: Partial Page Request (61)

after:

+ITU-T Recommendation T.30
   ...
   +Facsimile Control: Partial Page Request (61)
      Frame counter: 5
      Frames: 43, 44, 45, 46, 47

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