Re: [hylafax-users] hylafax as T.30 debugger?

[Lee Howard <lee.howard@xxxxxxxxxxxx>]

Klaus Darilion wrote:
> I want to go deeper and analyze the data the fax machines are really 
> seeing.
>
> Thus, my idea is to use Hylafax as the PSTN fax. Unfortunately I do 
> not have real fax hardware, but will use a Digium card and 
> Asterisk+Iaxmodem+Hylafax (via loopback). Now the question is - can I 
> use Hylafax as T.30 debugger? Will it report the reason why some 
> errors happen (e.g. timeouts ...).

You'll need to know how to read T.31 and T.30 and then the HylaFAX 
session logs will serve most of your purpose.

> What part of the fax decoding will happen in iaxmodem and what will 
> happen in hylafax?

iaxmodem acts as the Class 1 modem.  Thus it will do modulation and 
demodulation as well as some level of V.21 HDLC work, all as requested 
by the software.

If you need to analyze the modulation specifics or V.21 HDLC stuff, then 
you'll need to work with the spandsp code low-level... and that will 
require you to know a lot more about V.17, V.29, V.27ter, and V.21.

Thanks,

Lee.

--
*Lee Howard*
*Mainpine, Inc. Software Development Lead*
Tel: +1 866 363 6680 ext 805 | Fax: +1 360 462 8160
lee.howard@xxxxxxxxxxxx | www.mainpine.com


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