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by dkharrat 4154 days ago
> If I understand WebRTC correctly, once the link is established, all communication is peer to peer.

In general, it's peer-to-peer, but for clients that can't communicate peer-to-peer for whatever reason (usually due to certain NATs), a relay server is used as an intermediary. To the user it's transparent, so they can't easily tell if it's peer-to-peer or not.