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Speech-driven phone applications are the result of technological developments in computer telephony, speech technology (recognition & synthesis), and web technology. VoiceXML is the standard language in which most current speech-driven phone applications are implemented.

Live VoiceXML applications are based on the following architectural components:

The elements above constitute the physical building blocks of an application. An element which is at least as important, but immaterial, is the Voice User Interface (VUI): it implements the interaction between the application and the caller. VUI design is a critical succes factor in any speech-driven phone application.