I mentioned this bug as part of another mail a while ago but no one
responded, so I'll write about it explicitly before I forget it.
When doing some experiments with another jitsi user we encountered some
error messages saying that resampling was not possible. We then
attempted to use Opus with a different sample rate, but the setting
never took, the call info and the STDOUT output indicated that Opus was
still using 48kHz instead of the 24kHz we configured. It looked like
the setting had no effect at all.
AFAIR we both used some post 2.4 nightly build. I did not experiment
further to see whether this problem was present with other settings as