I have a Poly Sync 20-M (the Teams version), and other video conferencing apps that I use (Teams, Zoom, etc.) will sync the mute button on the speaker with the mute control in the app. So if I press the mute button in the app with my mouse, the speaker turns red and the mute indicator lights. If I then push the mute button on the speaker, it will turn off mute in the meeting app.