I know there is revolt as a FOSS alternative to discord but it’s not federated.
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Matrix and clients for it like Element have always been my go to for federated chat like discord/teams/mattersmost. The main missing feature is voice channels imho.
Aren’t voice and video calls (basically VoIP) what Turn (coturn) is supposed to support?
TURN is only used as a relay. It’s just a low(er)level transport layer, not specific to VoIP. Typically it is used as fallback when P2P communication between the attendees is not possible (for example due to a restrictive firewall).
