an important feature of managing an mcu videoconference is controlling which of the multiple participants is seen and heard.
■ the session can be managed by the mcu itself, either by continuous presence or by voice-activated switching. this configuration must be defined in the mcu.s session properties.
continuous presence up to four participants in an mcu session are
viewed and heard simultaneously.
voice-activated the participants see the video of the participant
switching whose audio signal is strongest. for example,
the non-speaking participants see the person
speaking.

■ participants can view the full-screen of a selected party. participant view overrides continuous presence and voice-activated switching.
■ the chair can force one party.s video to be broadcast to all the participants. a chair force overrides continuous presence, voice-activated switching, and participant view.