[Freeswitch-users] On-conference distortion for FreeTDM channels, but not SIP channels

[Melanie Treitinger]

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

Am 17.12.2013 15:27, schrieb Bob Hartwig:
> Melanie, et. al., I came up with a fix for this a couple of months 
> ago.  On the freeswitch-dev list, search for my message thread with 
> subject "New "mod_dahdi_timer" - does the community want this?"
>
>     Bob
>
>
>
> On Wed, Dec 11, 2013 at 1:42 AM, Melanie Treitinger 
> <treitinger at as-infodienste.de <mailto:treitinger at as-infodienste.de>> 
> wrote:
>
>     Nobody has an idea on this?
>     Here again Bob's Message from 2013-09-20:
>
>     I've tried everything I can think of on this, so now I'm reaching out to
>     you good people.  I have a FreeSWITCH system that has the latest version of
>     FreeTDM, Dahdi, libpri, and a Rhino R4T1 quad T1 board with up-to-date
>     firmware.  When I call into one of the PRI channels, a "playback"-played
>     file sounds clean, but when I go into conference, the conference audio is
>     distorted.  This does not happen with a SIP channel.  I would classify the
>     distortion as a "crackle", but it is very regularly periodic.  Repeating
>     ticks at (roughly) 10-20 Hz repeat rate, I would say.  I can only hear them
>     when audio is present, i.e. the audio seems to be modulated with the ticks.
>       And that conference audio can be the MOH guitar recording.
>
>     I've eliminated the following:
>
>     - T1 clocking
>     - Echo Cancellers (I've turned on and off all combinations of hardware and
>     software EC)
>     - T1 board firmware (it's the latest, and the problem only happens
>     on-conference).
>     - Packet length - it's the same (20 mS) for the conference engine, FreeTDM,
>     and Dahdi
>     - mu-law vs. a-law encoding - behaves identically.
>     - Comfort noise - happens with and without.
>     - conference sampling rate (tried 8000 and 16000, even though I'm using
>     TDM, which is 8000).
>     - FreeSWITCH version - happens on 1.2 stable, the latest master branch, and
>     an older version that we were using.
>
>     If you haven't heard of anything like this, could you please give me your
>     thoughts on why this could happen only on-conference, not while playing WAV
>     files, and only with FreeTDM channels?
>
>          Thanks!
>          Bob
>
>
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