When your on a conference with about 20 people or more, the background noises can be very distracting. Eagle Teleconferencing has a quick and easy solution for that problem. They offer the feature of having two different pin numbers, one for the speakers, and one for listeners. This way whenever the moderator is ready to start the call, he pushes *5 on his phone for lecture mode, and mutes all callers lines so everyone gets a nice, clear presentation.