What is VoiceXML?

VoiceXML W3C

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 IVR 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 digital devices.

VoiceXML supports dialogs that feature:

Recognition of spoken input (“automatic-speech-recognition”)
DTMF input (“phone keypad”)
Recording of spoken input
Synthesized speech output (“text-to-speech”)
Pre-recorded digitized audio output
Dialog flow control
Scoping of input
Automatic Number Identification (ANI)
Dialed Number Identification Service (DNIS)
Call transfer

Source: https://www.w3.org/

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