The best place from which to join a conference call is a quiet, secluded, private setting. Your office (if you can bar the door), your home if you can keep the kids out, your car (if it's really quiet and you're not prone to dialog with the other drivers). Your other participants will hear most if not all of the background noise in your setting. If you're a guest participant, you can mute your individual line to minimize that distraction for your other participants. If you're a host, you need to arrange to call from a quiet location with no distractions. Conference calling and public speaking don't mix. Call from a quiet location.