WebRTC to make calls to PTSN [closed]

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I'm looking at WebRTC and I'm wondering how to implement a solution where the client connects to the PTSN via SIP. It seems like a pretty new technology so I assume that this would not work on IE browsers; is this correct?

Basically, I have a dialpad UI on the page and users who have an SIP account. Can WebRTC enable the end-user to make calls to the PTSN and what does it take to implement such solution?

I'm looking into this as an alternative to Java or Flash based webphones.

Thanks for your suggestions.

Answer 1

WebRTC is indeed new and isn't available on IE or Safari. It is available in beta/alpha on other browsers. IE will probably support it in the future and Safari probably won't for some time.

WebRTC does only the media parts of the negotiation, and as such it means that it does no signaling of its own. SIP can work well with WebRTC, but you will need a JS implementation of SIP (over WebSockets) and then you'll need to unwrap the SIP signaling on the server side and "migrate" it to UDP or TCP. Asterisk are working on such a server side platform: http://blogs.digium.com/2012/05/23/asterisk-11-webrtc/

More about doing SIP in conjunction with WebRTC can be found here: http://bloggeek.me/html-sip/