Hi, I don't think this is due to an empathy bug because we tried first communicating with two gajim's. The connection comes up but both sides are can not hear anything.
I've done a new test by downgrading to jingle branch. hg update jingle
This works well and is able to communicate with an other gajim / empathy :-).
It would be nice if we can find the pproblem :-(. Thanks Halim