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Does Matrix have Drop-in Drop-out Voice Channels?
(lemmy.world)
An open network for secure, decentralized communication
There is the Video Rooms labs/beta in element. Try on app.element.io or develop.element.io
It's been in beta for a while now. Here's the blog post introducing video rooms: https://element.io/blog/drop-in-drop-out-chats-with-video-rooms-and-a-new-search-experience/