Wireshark-users: Re: [Wireshark-users] [Ethereal-users] ANSI 801-1
From: "RJ Honicky" <honicky@xxxxxxxxx>
Date: Tue, 29 Aug 2006 14:53:12 -0700
Hi there Guy,

Thanks for the quick response!  I'm actually not exactly sure which,
if any, protocol sits between 801-1 and TCP.  I know there is a
protocol which sits between the MPC protocol and TCP, and it sounds
from your message like there is something similar for 801-1, but I
haven't discovered what it is yet, in my case.

I'm actually trying to reverse engineer the link to see if I can debug
why my PDE requests are apparently being rejected, so I have no idea
how the protocol works, or what else lives with it in its eco-system.
If you have any suggestions with regard to that, I'd love to hear
them.  I'd be happy to pass you a trace if that helps you answer my

Thanks for the link too!


you wrote....

On Aug 28, 2006, at 2:46 PM, RJ Honicky wrote:

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Hi there all,

I'm trying to decode a stream of ansi 801-1 messages, to get LBS
running on my cell phone.  In order to debug a problem which seems
to be happening on the network, I have the phone contact my
machines, on which I have a simple proxy server running which will
forward messages back and forth to a PDE.   I am running Ethereal on
the machine and trying to examine the 801-1 packets, but ethereal
decodes them as Apache j-server packets.  I can not find 801-1 in
the "decode as" dialog.  I am using the port 8009, which is non-
standard if I recall correctly, so this could be part of the
problem, but my understanding is that I should be able to decode any
of the protocols by selecting them in the decode as dialog. You should
be able to decode any protocol *for which Wireshark (see   above) has
a dissector that's configured to run atop TCP or UDP* by   selecting
them in the "decode as" dialog. Unfortunately, the ANSI IS-801
dissector isn't one of them.  It's   configured to run atop the ANSI
MAP and ANSI A Interface dissectors. On top of what protocol is your
stream of ANSI 801 messages being   transported?  ("On top of" meaning
"*Directly* on top of", not   "somewhere on top of", i.e. what's the
protocol *immediately* below   it; if some protocol's being
transported atop TCP or UDP, and ANSI 801   is being transported atop
that protocol, ANSI 801 isn't being   transported "on top of TCP" or
"on top of UDP" for the purposes of   this question.)
Also, is there any freely available reference from IS-801-1?  What
reference was used to build the decoder?  The only one I can find
costs $280. 	http://www.3gpp2.org/Public_html/specs/C.S0022-0_v3.0_121203.pdf