Fax Problem on direct FXO port

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Asterisk Users 4 Comments


Seeing as this an issue related to faxing using the SpanDSP library;
if you do not get an answer leading to a solution here, then you may try
asking on the SpanDSP mailing list

It’s likely that the Asterisk users, specifically using SpanDSP, may be
on that list.


Rusty Newton
Open Source Community Support Manager
Digium, Inc | www.digium.com | www.asterisk.org

On 5/16/2012 12:44 PM, Sebastian Gutierrez wrote:
> Hi,
> I´m with asterisk
> DAHDI Version: Echo Canceller: HWEC, MG2
> SpanDSP: spandsp-0.0.6pre20.tgz
> http://www.soft-switch.org/downloads/spandsp/spandsp-0.0.6pre20.tgz
> FXO lines.
> Sending faxes works ok.
> but receiving gives me error:
> here is the debug:
> http://pastebin.com/qfFeXWQW
> any idea??
> Thanks!
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4 thoughts on - Fax Problem on direct FXO port

  • Rusty,

    thanks for the reply, the issue seems a spandsp issue, I changed to digium free asterisk fax and works much better, has still some issues that not all faxes pass ok, but does the work.


  • Hi Sebastian,

    “has still some issues that not all faxes pass ok, but does the work” ==
    still badly broken

    Your log doesn’t seem to show a spandsp error. It looks more like a bad
    signal. Did you change anything else when you installed FFA? Usually
    people move the other way to improve their results.


  • Hi Steve,

    Thanks for the reply, I didn’t change anything else, just changed spandsp version to de FFA, I use the spandsp version with more success in other places, but in this particular case, sending faxes works ok with both versions but with spandsp I couldn’t receive any fax, with FFA I may get 70% of faxes ok.