Between UPnP, ICE [0], and TURN, haven't we figured this out? I'm asking for real since I've never implemented these. Undoubtedly there are some configurations

Between UPnP, ICE [0], and TURN, haven't we figured this out? I'm asking for real since I've never implemented these. Undoubtedly there are some configurations where these methods fail, but I would expect they work fine on almost all consumer networks. I understand that TURN is where you proxy the connection through a third-party server, having given up on establishing a direct connection. While that does require a third-party server, there's no reason that server necessarily has to be directly owned/operated by the company; they could set up P2P relays in their devices, and/or open-source the server software so that it could be run locally. [0] https://tools.ietf.org/html/rfc5245 https://tools.ietf.org/html/rfc5245