The user who started a Pivot call has control of whether or not the stream is playing out to the end Pivotboxes

Use the start/stop stream button to control this.
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You can also control the play out on any Pivotbox you have invited directly to the call.
You can stop a Pivotbox from playing out the stream by hovering over the Pivotbox in the invite list and selecting the ‘stop’ icon. You can also remove Users or Pivotboxes using the ‘x’ icon.

To end the call entirely select ‘End Call’