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What is VoiceXML?
VoiceXML is based XML . Voice Extensible Markup Language (VoiceXML) applications provide access to content and services over the telephone, just as Hypertext Markup Language (HTML) web pages provide access over a web browser residing on a PC. The universal accessibility of the telephone and its ease of use makes VoiceXML applications a powerful alternative to HTML for accessing the content and services of the World Wide Web.

 

VoiceXML is designed 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. Its major goal is to bring the advantages of web-based development and content delivery to interactive voice response applications.

Features Of VoiceXML
Output of synthesized speech (text-to-speech).
Output of audio files.
Recognition of spoken input.
Recognition of DTMF input.
Recording of spoken input.
Telephony features such as call transfer and disconnect.

VoiceXML’s main goal is to bring the full power of web development and content delivery to voice response applications, and to free the authors of such applications from low-level programming and resource management. It enables integration of voice services with data services using the familiar client-server paradigm. A voice service is viewed as a sequence of interaction dialogs between a user and an implementation platform. The dialogs are provided by document servers, which may be external to the implementation platform. Document servers maintain overall service logic, perform database and legacy system operations, and produce dialogs. A VoiceXML document specifies each interaction dialog to be conducted by a VoiceXML interpreter. User input affects dialog interpretation and is collected into requests submitted to a document server. The document server may reply with another VoiceXML document to continue the user’s session with other dialogs.



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