Sets the server-side speaker volume on this participant’s bridged call leg (FreeSWITCH channel write volume) — what this participant hears from the mix before it reaches their client.
For local playback volume (the <audio> element the consumer attaches
remoteStream to), set audioElement.volume directly in the consumer’s
code.
Volume level (0-100).
Promise<void>
outputVolume$ — reactive state pair.SelfCapabilities.self.speakerVolume.