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Phono is a simple jQuery plugin and JavaScript library that turns any web browser into a phone; capable of making phone calls and sending instant messages. You can even connect to SIP clients; all with a simple unified API.
New: Phono Mobile for iOS and Android! Check it out
and Phono Java Applet! Check it out

Phone Calls

Make and receive phone calls directly in your browser using your existing JavaScript skillz. All it takes is a few lines of code!

IM/Chat

Phono also acts as an XMPP client capable of sending and receiving IM messages to and from any XMPP/Google Talk user