&miconly

Share audio-only; no video publishing allowed

Sender-Side Option! (&push)

Details

Mostly just an alias of &videodevice=0&webcam, but it also further hides the option to later select a video device via the settings menu. It also hides the 'mute camera' and screen-share buttons.

This is a useful option for when you want a guest to join a room and only publish audio, with no opportunity to share video.

Related

&videodevice&webcam