A very nice feature of another conferencing system that I've used is that the admin/moderator can press a star code to MUTE ALL OTHER USERS on the conference. This is great if you have several people on the call and one of the people puts the call on hold (and so the music/advertisement/your call is important/etc) message starts, or someone's cellphone handsfree unit in their car is making a bunch of noise, or someone's endpoint starts creating acoustic echo. To minimize disruption on the call, the admin should be able to press (*5) and this would mute all other users, and then he/she would just tell the participants that they can unmute their microphone by pressing *1. Just a suggestion for whoever is involved with evolving the ConfBridge app. Regards!