asterisk users - Sep 2007 - Asterisk - Spandsp Fax not working?

Hi all,
I'm trying to setup an asterisk based fax receiving machine.
i'm using asterisk 1.2.18 and app_rxfax with spandsp 0.0.4pre9
I have no problems with a modem-fax, but with the fax machines i have tried
almost every fax fails, both in sending and receive.
the machines are sending a receiving a lot of faxes every day and working
well, so i think the problem is on the spandsp side.
i have tried almost every spandsp version from 0.0.2 to the current one,
both with and without ECM, but without luck.
has anybody succeeded in receiving faxes with asterisk app_rxfax and
spandsp?

I'm noticicing a lot of different behaviours: sending w ECM gave me an OK,
and the second half of the page was missing, other faxes fail with
Sep 26 17:26:18 DEBUG[4741] app_rxfax.c:
=============================================================================Sep
26 17:26:18 DEBUG[4741] app_rxfax.c: Fax receive not successful - result
(11) Unexpected message received.
Sep 26 17:26:18 DEBUG[4741] app_rxfax.c:
=============================================================================

can anybody help me?
thank you in advance,


marco
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marco britannio wrote:
> Hi all,
> I'm trying to setup an asterisk based fax receiving machine.
> i'm using asterisk 1.2.18 and app_rxfax with spandsp 0.0.4pre9
> I have no problems with a modem-fax, but with the fax machines i have 
> tried almost every fax fails, both in sending and receive.
> the machines are sending a receiving a lot of faxes every day and 
> working well, so i think the problem is on the spandsp side.
> i have tried almost every spandsp version from 0.0.2 to the current one, 
> both with and without ECM, but without luck.
> has anybody succeeded in receiving faxes with asterisk app_rxfax and 
> spandsp?
> 
> I'm noticicing a lot of different behaviours: sending w ECM gave me an 
> OK, and the second half of the page was missing, other faxes fail with
> Sep 26 17:26:18 DEBUG[4741] app_rxfax.c: 
>
=============================================================================>
Sep 26 17:26:18 DEBUG[4741] app_rxfax.c: Fax receive not successful -
> result (11) Unexpected message received.
> Sep 26 17:26:18 DEBUG[4741] app_rxfax.c: 
>
=============================================================================>
> 
> can anybody help me?
> thank you in advance,
> 
> 
> marco
> 
> 
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Marco,

First off, do not use any version over 0.0.3. I am using 0.0.3 on centos 
4.5, asterisk 1.2.24 and freepbx 2.3 and it is working very well. One 
very important thing to keep in mind is that faxing over voip will only 
work reliably with ulaw or alaw and your internet connection MUST be 
able to sustain a constant data stream with low jitter. If your 
interested I have a shell script to install asterisk 1.2.24 and 
freepbx-2.3 with rxfax and txfax on centos 4 and working on centos 5.

Jonn

http://jonnt.users.taylortelephone.com/asterisk/centos-asterisk-install.sh
and hylafax / iaxmodem
http://jonnt.users.taylortelephone.com/asterisk/