[Asterisk-Users] Re: spandsp txfax multi page problem

[Nenad Radosavljevic]

Hi !

I have a same problem here, tried even more different versions of *, 
libtiff, spandsp, and lot of different hardware (X100P,TE110P,mISDN ISDN 
BRI, and TDM400) and a lot of different faxes (but mostly Panasonic ones) on 
a various landlines (over couple of POTS lines, over ISDN BRI where 
receiving FAX is connected to the NT1 device with POTS ports, over Panasonic 
PBX that is connected to Telco over ISDN PRI, and the fax is PBXs 
extension).

Result is more or less same: First page OK and without visible problem on 
paper, but after that, receiving fax machine just hangs up, and spandsp 
reports a bad quality signal. I have actualy managed to send 2 or 3 
different multipaged faxes (tiffs generated by some Windows TIFF printer 
driver that has FAX resolutions and image coding support), but ONLY to a one 
model of Panasonic FAX machine (which is obviously not good enough :( ).

On the other hand, all those fax machines I have tried are receiving 
multupage faxes from other fax machines without any problems.

Judging from what I have read from Steve (author of spandsp) posts here and 
replies to my emails, the problem is somewhere in proces of retraining 
between pages (i.e. receiving fax machine say that signal is not good 
enough, but it will continue to receive after retraining, and spandsp 
doesn't retrain for some reason in that case). Anyway, that is as far as I 
have got with app_txfax. On the other hand, app_RXfax is doing great job on 
X100P and on TE110P in my case.

Regards,
                Nenad Radosavljevic

>
> Dear All,
>
> I'm having problem with spandsp/txfax,
> I'm not able to send a multi paged tiff file,
> the fax machine receives the first page of the document and
> complains about communication problem.
> The file what I'm trying to send has 2 pages and
> is received & generated by spandsp/rxfax.
> Searched in the archives, but found no solution.
>
> I'm using:
> Dell Optiplex PC
> Inoteska Quad E1 card
> Fedora Core 3
> asterisk 1.0.9 (tried 1.0.7)
> spandsp 0.0.2pre20 (tried 0.0.1k, 0.0.2pre19)
> libtiff 3.6.1 from distro (tried 3.5.7, 3.6.0 & 3.7.1 from source)
>
> heard the same problem on a Debian/Sangoma machine
>
> thanks in advance,
> Bertalan
>