I was on a huge conference call last night and there was a lot of noise. The moderators of the conference call kept saying to hit *6 on your phone to mute your line. This is a great idea for conference calls. I think on my next conference call I will have to try this. I know there is an option to mute the whole conference call but I think the moderators wanted to keep the whole conference call open. Moderators can hit *5 to mute out the whole conference call and then they can speak without any noise. I do like this feature also but to keep an open conference call *6 sounds good. I am going to try this on my conference call tonight.