For example, a voice-mail system is a simple IVR application butits call flow is more or less "hard-wired" only permitting callers toleave voice messages and users to check voice messages. The pre-VoiceXML dialog engines may or may not be particularlyprogrammable. Voice applications have traditionally been hosted on a machine called an IVR.This machine is typically a special purpose computer outfitted with telephonyhardware, possibly speech processing hardware and software, and some sort of adialog engine that executes the call-flow logic. 1.1 Voice services and applicationsīefore diving into VoiceXML, we first need to understand the current"state of the art" in voice application technology the"pre-VoiceXML" voice application landscape. It will show the motivation behindVoiceXML as a clean, enterprise-computing-friendly, open standards technologythat unifies the many aspects of the voice application world. The remainder of this chapter will gently introduce you to the worldof computerized telephone applications. VoiceXML is changing the way we interactwith these and other voice applications. One of the most common examples of voice applications, that isfamiliar to many of us, is the Interactive Voice Response ( IVR)application: an automated service where you can call in and check your bankaccounts, the status of a package, or the estimated arrival time of a flight all without speaking to a human.
VoiceXML is being used in applications such as voice portals,where automated voice services can be accessed over the phone, and non-phonebased voice applications, emerging in embedded home appliances andautomobiles. VoiceXML is an XML document type for authoring voicedriven audioapplications.
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