User Guide for the VC120 Video Conferencing System92If you select Auto, the system will select the appropriate bandwidth automatically.5. Click Video Call or Voice Call.When the first party answers the call, the call is established.6. Repeat the steps 3 to 6 to invite more parties to join the conference.Chairman-Mode ConferenceWhen the number of participants is greater than or equal to 5 in a multi-point video conference,the conference will be a chairman-mode conference. The conference organizer will act as theconference chairman who can manage the conference.Conference ModeChairman-mode conference supports Single Speaker, Multi Speaker and Free Discuss threeconference modes.Single SpeakerConference organizer authorizes a single member to speak, and all the other members aremuted.