For what it's worth, this recording captures exactly what I addressed with my dahdi_timer module.  That module won't work for Sangoma, of course.

To read a pretty detailed analysis of what the problem is, do a search of messages from me on this list and on the freeswitch dev list around September 2013.  I would volunteer to port that timer module to work with Sangoma, but I don't have any Sangoma boards.  If Sangoma wants to send me a PCIe board free of charge, and give me some guidance on how to derive the 8 KHz T1 clock via the equivalent of /dev/dahdi/timer (or however else), I'll give it my best shot.  Otherwise, look at what I did in dahdi_timer.c.

    Bob





On Thu, Jan 2, 2014 at 8:10 AM, Melanie Treitinger <treitinger@as-infodienste.de> wrote:
Hi Brian,

I have attached an a-leg recording of a distorted conference where I play the freeswitch welcome message for testing.

The recording is placed in the dialplan before the conference is created:
<action application="record_session" data="/path/to/recording/test_distortion_${strftime(%Y-%m-%d-%H-%M-%S)}.wav"/>
...
<action application="conference" data="${conference_command}"/>

Hardware is a Sangoma ISDN card (as recommended...).


Best Regards
Melanie
 

      Am 29.12.2013 21:54, schrieb Brian West:

    

    

      
What kind of distortions are you experiencing? On what hardware?
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On Dec 17, 2013, at 10:42 AM, Melanie Treitinger <treitinger@as-infodienste.de> wrote:



      

        
Hi Bob,

thank you very much for your answer and the Dahdi patch (http://jira.freeswitch.org/browse/FS-5898).
However we are using Sangoma and don't know yet how to adapt this patch for our cards.
Does anyone know how to do this?

Melanie


      

      

      

      

      

      
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