What is VXML?

VoiceXML is a XML based markup language used to create voice applications. VXML is used along with ECMASCRIPT for performing various functions. ECMAScript is a standard scripting language based on JavaScript. In normal cases you will never find the difference, except in the name. The VXML language provides means for collecting character and/or spoken input, assigning the input results to document-defined request variables, and making decisions that affect the interpretation of documents written in the language.

VXML is similar to HTML. While HTML is used to create visual applications, VoiceXML is used to create voice applications. Within a voice application, a VoiceXML Interpreter sends the request to the web server, which will return a VoiceXML document to be presented as a voice application using a telephone. In HTML, a web browser will make a request to a web server, which in turn will send an HTML document to the browser to be displayed visually to the user.

VoiceXML can be used for creating audio dialogs that feature synthesized speech, digitized audio, recognition of spoken and DTMF key input, recording of spoken input, telephony, and mixed initiative conversations. Speech synthesis is the artificial production of human speech. A text-to-speech (TTS) system converts normal language text into speech. DTMF stands for Dual-tone multi-frequency. DTMF signaling is used for telecommunication signaling over analog telephone lines in the voice-frequency band between telephone handsets and other communications devices and the switching center. The version of DTMF that is used in push-button telephones for tone dialing is known as Touch-Tone. DTMF key input is the input you enter by pressing a key in your telephone. Mixed initiative is a computer-human interaction in which either the computer or the human can take initiative and decide what to do next. Mixed initiative adds flexibility and power to voice applications.

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