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mike at jerris.com
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 Posted: Wed Jan 21, 2009 11:15 am Post subject: [Freeswitch-users] Q931 decoding |
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If you can get it to work in openzap, it will be easy enough for me to
port when we do the windows driver integration for openzap.
Mike
On Jan 21, 2009, at 10:01 AM, Helmut Kuper wrote:
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Hello,
It's a standalone program to profe concept. So I think I will get it
working this week as standalone.
Next week I plan to start to integrate the code into openzap/
ozmod_isdn.c
Biggest problem currently (in my head) is the file handling of the
pcap
file. Currently I have only one file which is opened at startup time
and
closed during shutdown. In between there is no checking for a certain
file size to make a file cycle decision or stopping and closing the
file. I guess it is better to have a FS console command to start stop
the trace on demand instead of having a config parameter which enables
the tracing during FS lifetime.
Further problem is that I have no way to test the code on a windows
machine. So I have no idea whether it compiles on windows or not.
Thanks for your support so far.
regards
Helmut
Am 21.01.2009 14:53, schrieb Anthony Minessale:
| Quote: | Do you have it integrated into openzap or just standalone?
We can give you commit access to openzap if you want to maintain
the patch
in tree if you'd like.
On Wed, Jan 21, 2009 at 5:58 AM, Helmut Kuper
<helmut.kuper@ewetel.de>wrote:
Hello,
just an update about my progress in this.
Currently I have working C code which creates a pcap file
containing all
needed protocoll headers in front of the Q931 dump. I use libpcap to
create the pcap file. The protocol addresses of each protocol header
structure are dynamically set by the code to reflect direction,
sequence
and timeline of each Q931 packet in whireshark. Wireshark can read
and
decode the current packets generated by my C code correctly.
regards
helmut
Am 19.01.2009 19:46, schrieb Michael Collins:
| Quote: | | Quote: | | Quote: | Until Helmut gets his script, etc. all set the only choice you
have is
to capture the debug output on the command line.
-MC
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steveu at coppice.org
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| Posted: Thu Jan 22, 2009 7:11 am Post subject: [Freeswitch-users] Q931 decoding |
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Helmut Kuper wrote:
| Quote: | -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Hello,
just an update about my progress in this.
Currently I have working C code which creates a pcap file containing all
needed protocoll headers in front of the Q931 dump. I use libpcap to
create the pcap file. The protocol addresses of each protocol header
structure are dynamically set by the code to reflect direction, sequence
and timeline of each Q931 packet in whireshark. Wireshark can read and
decode the current packets generated by my C code correctly.
|
Have you figured out how well the Q.931 decoder in wireshark works? The
decoders I have used, like T.38, are extremely buggy.
I wonder if wireshark offers a shortcut that you have missed, for
getting the data in. If you look through the supported protocols, there
are some which never touch an IP network. For those to be useful, people
must have a easy way to tie their data sources into wireshark. I've
never looked into what they do, though.
Steve
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helmut.kuper at ewetel.de
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| Posted: Thu Jan 22, 2009 11:15 am Post subject: [Freeswitch-users] Q931 decoding |
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Hi Steve,
wireshark decodes all things I needed to debug q931 and by now I haven't
found a bug compared to my commercial "aurora duet" q931 monitor device.
Well I spent some time to find a way in wireshark to get raw and pure
q931 data in, but I didn't found a way except creating a protocoll stack
as wireshark expect it. Nevertheless wireshark allways decodes from
layer 1 successive to upper layers. This tells me that I definately have
to encapsulate q931 somehow in a layer 1 link known by wireshark. Sa far
as I know q931 is a layer 3 protocol in ISDN world, thus it can not be
read directly by wireshark.
whireshark knows a lot of layer 1 protocols - much more than me. And so
I decide to use the protocols I know and wireshark knows.
But if you find a direct way, please let me know, so I can speed up the
logging of q931 packets into pcap file.
regards
helmut
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