asterisk users - Nov 2004 - Faxing issues (no VoIP involved)

Hey guys.

I'm having constant problems with faxing. All my calls come in via PRI 
to my t100p, then I have a TDM w/FXS ports that I have the fax machine 
plugged into.

About half the time the faxes come in half complete or garbled. I have 
echocan off. I'm not sure what else to try.

Anyone have any pointers?

Thanks,
-- 
Daniel Jimenez <djimenez[at]pobox[dot]com>

On Tue, 2004-11-09 at 06:38, Daniel Jimenez wrote:
> Hey guys.
> 
> I'm having constant problems with faxing. All my calls come in via PRI 
> to my t100p, then I have a TDM w/FXS ports that I have the fax machine 
> plugged into.
> 
> About half the time the faxes come in half complete or garbled. I have 
> echocan off. I'm not sure what else to try.
> 
> Anyone have any pointers?
> 
You could try:

exten => _1NXXNXXXXXX,1,Dial,Zap/47/BYEXTENSION||d

the "d" at the end means, that we are talking about a data call, that
is
passed through, taking, that you haven't set that yet.

Kind regards,
Martin List-Petersen

Hi Daniel,

Its a *very* common problem. See http://www.opencall.org/faq/x26.html

Steve

Daniel Jimenez wrote:
> Hey guys.
>
> I'm having constant problems with faxing. All my calls come in via PRI 
> to my t100p, then I have a TDM w/FXS ports that I have the fax machine 
> plugged into.
>
> About half the time the faxes come in half complete or garbled. I have 
> echocan off. I'm not sure what else to try.
>
> Anyone have any pointers?
>
> Thanks,

On Tue, 09 Nov 2004 00:38:39 -0600, Daniel Jimenez <djimenez@pobox.com>
wrote:
> Hey guys.
> 
> I'm having constant problems with faxing. All my calls come in via PRI
> to my t100p, then I have a TDM w/FXS ports that I have the fax machine
> plugged into.
Make sure your timing is being set correctly on the t1 from the telco.
 I had the exact same problem before I realized I was doing things
wrong.

Timing is set in the /etc/zaptel.conf file in the span section:
# My FXS channel bank uses internal timing
span=1,0,0,esf,b8zs
             ^
# SPAN 2 is the T1 to telco set it to get timing here
span=2,1,0,esf,b8zs
              ^

Once I fixed this, nearly all my fax troubles have gone away.

John