What you're saying is IMPOSSIBLE to have happened.  The rates are checked, the only values accepted are 8000/12000/16000/24000/32000/48000, Had you set it to 11999 it would have defaulted to the 8000.

So don't stop looking because you've yet to find the real problem.

--
Brian West


Twitter: @FreeSWITCH , @briankwest

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On Jun 16, 2014, at 1:48 PM, Oleg Stolyar <olegstolyar@gmail.com> wrote:

Never underestimate the power of desperation and monkeying around with things you don't understand :-)

In case someone else runs into this problem:

After all else failed I figured that this may have something to do with conference settings since this problem never happened outside of a conference.
I started changing conference profile params.  Lo and behold, after I changed the sample rate param to 12000 (from the default 8000) the problem went away.  Interestingly, at 11999 it still happened but at 12000 or above, it completely disappeared.

Frankly, I have no idea why but I'll take it :-)