[Asterisk-Users] spandsp and app_rxfax (alternative topic: t38modem)

[Ryan]

Hmmmm. Did I just ask in the wrong forum, or has _nobody_ experienced image 
corruption using app_rxfax that was NOT due to using the wrong version of 
libtiff?

If that's the case, then my secondary approach is going to have to be:
  PSTN <-> Asterisk + chan_h323 <-> t38modem + Hylafax

Is there anybody that could help me with either of these solutions?

A thousand "thank you"s in advance,

Ryan VanMiddlesworth


On Thursday, January 6th, I wrote:
> I've been pulling my hair out trying to get Asterisk to receive and
> decode a fax using spandsp and app_rxfax.  It seems like it should be
> working.  The fax machine on the other end connects and Asterisk reports
> a fax coming in.  But when it's done all I have is a 2 or 3 KB TIF (see
> attachment).
>
> The console activity looks completely normal:
>     -- Starting simple switch on 'Zap/3-1'
>     -- Executing SetVar("Zap/3-1",
> "FAXFILE=/var/spool/asterisk/fax/1105043880.0.tif") in new stack
>     -- Executing RxFAX("Zap/3-1",
> "/var/spool/asterisk/fax/1105043880.0.tif") in new stack
>     -- Hungup 'Zap/3-1'
>
> And there are no errors in the log file.
>
> Here's my config:
>   Wildcard TDM40B hardware (Zaptel)
>   asterisk-1.0.2
>   spandsp-0.0.2pre6
>   libtiff-3.6.1 (with the fax fix patches)
>   (also tried libtiff-3.6.0 and libtiff-3.5.7)
>
> I've tried multiple sending fax machines and get the same effect.
>
> Any tips on getting this setup working?  I've run out of ideas.
>
> Alternately, I'd also be willing to offload the DSP processing to a
> HylaFAX machine using some sort of software fax driver.  I tinkered with
> t38modem and chan_h323, but couldn't get it to do anything once the
> HylaFAX machine answered.  So if anybody has any experience with that,
> I'd be interested.
>
> Thanks in advance,
> Ryan VanMiddlesworth