Hello, how can i got the user id of user who paused his mic because i just got the user_id=null but i would the user_id to make notification to all users in this room . Please anyone can help me
A user pausing their mic producer is different than observing silence on an audioLevelObserver. Which one do you want to notify people of?
Of course. It’s really crazy the fact that you are using audioLevelObserver for that. Really crazy. Everything is documented:

