I'm going to agree with you and take this opportunity to plug http://cleanfeed.net/ http://cleanfeed.net/ We run a free 'VOIP' system that does zero processing

I'm going to agree with you and take this opportunity to plug http://cleanfeed.net/ http://cleanfeed.net/ We run a free 'VOIP' system that does zero processing on your audio. It's actually for broadcasters who just want to get live audio from A to B, untouched. But as it's two way (and multi-way) we're finding users contacting us to say they're using it for regular 'conferencing'. I suppose we are also doing it ourselves; we used Cleanfeed to communicate when developing Cleanfeed. Elsewhere in the thread people mention jitter etc. issues. In my experience, 200-300ms of latency has much less negative impact on rapport than aggressive audio processing.