On Eagle Teleconference's conference calls they provide a feature that the callers can mute their conference line. I know that sometimes when I call into a conference call there are a lot of other things going on in my office. So I use this feature for all conference calls. And its easy. I only have to press *6 on my phone and that mutes my line. I can still hear what is going on in the conference call, but they can't hear me, but if for some reason I need to unmute my line I can by pressing *6 again.