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.
The service required is to register and lookup a
conference id to Multicast group mapping.
Floor control is achieved through normal vocal human
interaction. Humans are used to this, and interaction
with the workstation seems unnatural. However, a
;SPM_quot;microphone off;SPM_quot; button and status display is useful
for long term information.
Silence suppression suffices to get efficient traffic