[Asterisk-Users] fax receive using TDM400P

[Rob Danz]

I wrestled with this for a long time, as have many others and it just
doesn't work with spandsp and asterisk alone.

Use iaxmodem and hylafax in conjunction with asterisk... it works like a
champ.  I have a single POTS line coming in so I get voice & fax with a
single number using fax detect.  

http://iaxmodem.sourceforge.net/



-----Original Message-----
From: Rich Adamson [mailto:radamson at routers.com] 
Sent: Friday, February 24, 2006 7:28 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] fax receive using TDM400P

> Ive been testing how to receive faxes using TDM400P cards and so far,
after
> playing with gains, echocancell and echotraining on zapata.conf.. Ive ha
dno
> luck, faxes come in as garbage or broken or with blank lines.
> 
> Anybody has successfully done this? Any tips.. Also I have some ideas:
> 
> 1. Is it really possible to get fxes on a fax machine using ATAs like the
> sipura 2002? Even using ulaw and pass-thru, is it possible?
> 
> 2. Since the faxes is coming from PSTN thru the card, I guess asterisk
will
> always stay in the middle right? No way around this.
> 
> 3. Im also trying to receive faxes usign a TE110P card with spandsp,
unicall
> and E1 R2MFC, no luck also, some stuff, garbage and broken faxes. Anybody
> done this sucessfuly?
> 
> Hope anybody can share their thoughts and insight on this.

Using the TDM400 card for any form of fax'ing (or modem use) is well known
to be unreliable and, in most cases, totally unusable. The issue has been
discussed many times over the last two years or so. There are no known
workarounds.

Its my understanding that lots of folks have spandsp working via T1
and/or PRI interfaces. The issues associated with the TDM400 card do
not apply to the T1 cards.