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

[Andrew Kohlsmith]

On January 7, 2005 12:26 pm, Matthew Boehm wrote:
> > Seems to be correct, or at least image corruption from a really crappy
> > fax reception.  I know I've been receiving between 30-50 faxes a day with
> > app_rxfax without issue.
>
>     What versions of everything are you using? Using PRI? libtiff? spandsp?
> asterisk? diagram? I can't get any faxes via rxfax.

Slackware 10.0 system
libtiff NOT FROM slackware install, compiled manually 3.5.7
libpri and asterisk from CVS HEAD (~20041216)
spandsp 0.0.2

You will note that the standard slackware install has libtiff in the 
aaa_elflibs package.  You must go in there and manually obliterate anything 
TIFF (IIRC it's only /usr/lib/libtiff.so.3.6.1 and the symlinks)

Diagram is deceptive:

PRI - TE405P - Asterisk1 - IAX2 - Asterisk2

IAX2 link is a 1-hop SDSL link over Pairgain Megabit Modem 300S devices.  
Ethernet cards are Intel gigE on Asterisk1 and a Realtek RTL8139.

Asterisk1 is a Supermicro server - Xeon processor, SCSI hard disks, ECC RAM.  
Asterisk2 is a simple plain-jane P3/800.  Asterisk2 also has a TDM430P in it 
which I send faxes from (Canon IR3300 and an ancient Epson fax) -- I cannot 
RECEIVE faxes to either of these reliably through the TDM card (they worked 
fine when I had a T100P+Adit600 channel bank), which is why I set up 
app_rxfax.  I wanted to see if it was the TDM card botching up or faxing over 
the IAX2 link; it's the TDM430P.

It's strange, I can send through the TDM430 just fine, but neither fax can 
receive worth a shit through it.  And both machines support ECM and so on.  
My fax rx rate hovers around 50% though the TDM430.  It's at 100% with 
app_rxfax.

-A.