[Asterisk-Users] Fax and PRI

[Lee Howard]

On 2005.01.19 17:06 Jon Radon wrote:
> I use a Multi-Tech Multimodem ZPX and a Sipura SPA-2000 along with
> Hylafax.  On the Asterisk end I'm using X100P's.  This has worked
> flawlessly for me thus far.  Some tips of my success.
> 
> 1.)  Fax detect on the Sipura breaks faxing.  Strange, I know.
> 2.)  Tuning your txgain and rxgain both on the Sipura and on the
> Zaptel line is imperative.
> 
> Originally with this setup I was getting all kinds of bad frames.
> After tweaking my faxes are squeaky clean.

Thanks for these tips it reminded me that I still hadn't looked in on 
the FXS port ("line") settings on the SPA.  (I don't receive many faxes 
on this setup, so it hasn't been a priority.)

As it turns out, disabling silence suppression, echo cancellation, echo 
suppression, and all of the "fax" features did the trick.  Now I'm 
receiving faxes fine.

I did also have to disable V.34-Fax on the HylaFAX-controlled modem.

I didn't have to adjust any of the gain controls, although I already 
had adjusted the FXS port impedence a long time ago.

Lee.