WebRTC Simple Calling API + Mobile SDK - A simplified approach to RTCPeerConnection for mobile and web video calling apps.
Wow. That is a tall order. Fortunately there is such a Script / SDK etc. available for you. You will need a PubNub account. https://github.com/stephenlb/webrtc-sdk
📡 Simple WebRTC video, voice, and data channels
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Open-EasyRTC - EasyRTC Free of Priologic
Your original question was a WebRTC peer -to-peer call that doesn't take any bandwidth. I suggest WebRTC-SDK because it does not require a NodeJS server to run. Just two files placed on your web host in the correct places and a PubNub account and you're making calls. If you're fine with a Nodejs server in the mix i'll suggest trying Open Easy RTC. https://github.com/open-easyrtc/open-easyrtc
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