Audio services can make very good use of a real time multicast facility. On a LAN or WAN (e.g. ATM) where multidestination packet delivery is efficient (e.g. order 1 for n destinations), each conferee simply joins the multicast group for a particular conference. Even in a WAN without optimal multicast, the normal audio interactions involve only a single speaker, and therefore only a shingle multicast distribution tree of traffic at any one time (mostly). There is no need for floor control and traffic distribution to interact.