I know there is revolt as a FOSS alternative to discord but it's not federated.
Aren't voice and video calls (basically VoIP) what Turn (coturn) is supposed to support?
https://matrix-org.github.io/synapse/v1.41/turn-howto.html
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).
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Aren't voice and video calls (basically VoIP) what Turn (coturn) is supposed to support?
https://matrix-org.github.io/synapse/v1.41/turn-howto.html
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).