Occurs when the active video user is changed.
Occurs when the local audio mute by server.
Occurs when the local dial state is changed.
Occurs when a new user joins a meeting
Occurs when a user leaves or disconnects from a meeting
Occurs when a user role has changed, such as, user assigned to moderator.
Occurs when a user's state changed
Occurs when the local video mute by server.
Occurs when the active speaker user is changed.