There exist relays of different types which use up a lot of resources, instead of providing them directly 88.io provide directories of these relays for easy reference.
TURN Relay
TURN enables WebRTC traffic (e.g. audio, video etc.) to be relayed between WebRTC clients that cannot be connected directly with each other - even with the help of STUN servers e.g our own stun.88.io.
Some applications that use Multiple TURN servers:
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NetBird
question about multiple coturn servers in selfhosted · Issue #1286 · netbirdio/netbird · GitHub -
BigBluebutton
Turn Server Configuration | BigBlueButton
Some applications that use Single TURN servers: