This what we know about the technology behind Facetime: https://cdn.andyet.com/webrtc-reports/facetime-report.pdf

Apple is already participating to the WebRTC Working Group at W3C: http://www.w3.org/2000/09/dbwg/details?group=47318&public=1

Tip from the Apple team: just ask! Seriously! >> https://forums.developer.apple.com/content?query=webrtc >> https://bugreport.apple.com

A way to contribute getting WebRTC supported by Safari: http://www.webrtcinwebkit.org/blog/2015/3/28/bringing-webrtc...

In the meantime, a few workarounds: http://www.makeuseof.com/tag/heres-make-internet-explorer-sa...