The Voice eXtensible Markup Language (VoiceXML) is an XML-based markup language for creating distributed voice applications, much as HTML is a markup language for creating distributed visual applications. It is an industry standard defined by the World Wide Web Consortium (W3C) at http://www.w3.org/TR/voicexml21/ (for VoiceXML V2.1) and http://www.w3.org/TR/voicexml20/ (for VoiceXML V2.0).
The VoiceXML language enables Web developers to use a familiar markup style and Web server-side logic to deliver applications for use over telephone lines. The resulting VoiceXML applications can interact with existing back-end business data and logic.
Using VoiceXML, application developers can create Web-based voice applications that users can access by telephone or other pervasive devices.