Take a look at sipML5. This is one of the first open source SIP clients using HTML5. It is written in JavaScript, uses Web Real Time Communication (WebRTC) and supports voice and video calls, as well as text messages. The client should work in any web browser that supports WebRTC without the need for any plug-ins, and therefore is suitable for the implementation of websites. However, only the latest browsers, such as Chrome Canary, support WebRTC.
Multi-user video conferencing, etc. not yet implemented.
http://www.sipml5.org/
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