ParticipantStep 
    interface ParticipantStep
Represents the Participant functions section.
Properties
Functions
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                  Sets the call ID.
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                  Requests an upgrade of the call to include media.
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                  Signals that the participant has muted themselves.
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                  Signals that the participant has unmuted themselves.
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                  Disconnects a participant.
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                  Specifies the aspect ratio the participant would like to receive.
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                  Requests to release presentation floor.
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                  Disables the "spotlight" on a participant.
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                  Enables the "spotlight" on a participant.
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                  Requests to mute participant's video.
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                  Requests to unmute participant's video.