TrueConf Server - Asymmetric Group Conference; Role-Based Group Conference

This conference type availability is limited by the TrueConf Server license
3.5.2. Asymmetric conference (Asymmetric)
Can have up to 36 participants at the same time;
One user is chosen to be the Host. He can see and hear everybody;
Other users can see and hear only the Host.
TrueConf Server Administrator Guide
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