[Asterisk-Users] Squished faxes with txfax

[Scott Eisert]

Josué,

My setup is:

txfax ->[Asterisk] -> E1 Pri ->[Cisco 5350]-> t.38 with Sip -> [Terminating 
Carrier]

So the t.38 is all done by the Cisco 5350 and not by asterisk at all.  

I have done some tests with a Cisco ATA186, but with limited success using 
g.711 pass through.

I can receive faxes using rxfax with a similar setup but a different carrier.  

Finally, if I change the Cisco -> Terminating Carrier connection to use g.711 
the fax quality is much improved, which indicates that either the Cisco's 
t.38 or the terminating carriers t.38 is broken or incompatible.

- Scott

On Tuesday 28 March 2006 7:33 am, Josué Conti wrote:
> Scott, as you made to install the T38 in asterisk? To receive fax it is
> normal? You use an ATA?
> Greetings
>
> 2006/3/28, Scott Eisert <lists at scotteisert.com>:
> > Hello,
> >
> > I have been getting squished faxes very reliably when sending through
> > Asterisk
> > using txfax.  It looks as if all horizontal white space has been removed.
> > Interestingly it is perfectly repeatable, which seems to rule out timing
> > related issues.
> >
> > My configuration is:
> > Asterisk SVN-branch-1.2-r7337M
> > spandsp-0.0.2pre21 ( though I have tried a 0.0.3 snapshot as well as
> > 0.0.2pre25 )
> > libtiff 3.8.0-3
> >
> > I am sending the fax out from Asterisk over a E1 to a Cisco 5350, which
> > then
> > is sending t.38 out to the terminating carrier.  The fax completes every
> > attempt, so it doesn't appear to be IP related, and as I mentioned
> > before, the fax on the receiving end always looks almost exactly the
> > same.
> >
> > Also, if I send a fax with a vertical bar down one side the image is not
> > squished nearly as much as something with just text (like an invoice)
> > which
> > will be about 1/3 the size of the original.
> >
> > I have also tried sending faxes using iaxmodem and HylaFax to Asterisk,
> > which
> > gave perfect results about 1 in 30 tries, with most failures resulting in
> > incomplete page.
> >
> > Any suggestions will be greatly appreciated.
> >
> > - Scott
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