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@as-infodienste.de <mailto:treitinger@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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