I configured in my config.js file:
startVideoMuted: 2, startAudioMuted: 2,
Then we joined the video conference with 4 people but everyone has audio and video activated. You can find my config.js here: https://test-jitsi.mpi-bremen.de/config.js
Is there any trick to get this working? For sure, we cleared all our browser cache, so the config.js file was downloaded new from the server.