Techniques are described herein for causing a client to pre-join a meeting while using signaling to indicate that it is “invisible” and should not show up in the roster. Furthermore, it does not render any incoming Audio/Video (AV), and does not send any from the camera or microphone. When the user joins, the client starts rendering the media it has already been receiving and then starts sending camera and microphone content. This makes the join process more like an “unmute” operation, which is entirely local and thus can happen instantly.
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Rosenberg, Jonathan, "ZERO SECOND MEETING JOINS", Technical Disclosure Commons, (October 17, 2018)