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a free full-stack WebRTC solution, with backend servers, clients, API.

* Mozilla provides the OAuth 2.0 authentication, the signaling server, and the clients

* Tokbox (Telefonica) provides STUN/TURN server http://tokbox.com

* Nexmo provides SMS service / MSISDN gateway http://nexmo.com

Thanks, your mozilla wiki link answers my group video calling question: Loop / Hello is primarily meant for 1-to-1 video calling.

Although this is an awesome development, group video would have made it a killer application.

(for now, you can use https://opentokrtc.com/ to try out OpenTok's group video calling support)