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It does voice via Jitsi https://matrix.org/blog/2020/04/06/running-your-own-secure-communication-service-with-matrix-and-jitsi/
This is outdated and no longer preferred, it now has its own internal system called Element Call (aka an implementation of MatrixRTC).
i use coturn for voice on mine
I meant for video. The classic coturn connection is fine for voice - though I wish it had push to talk. 🥲