VOICE XML

VOICE XML

INTRODUCTION:

VoiceXML is a language for creating voice-user interfaces, particularly for the telephone. It uses speech recognition and touchtone (DTMF keypad) for input, and pre-recorded audio and text-to-speech synthesis (TTS) for output. It is based on the Worldwide Web Consortium's (W3C's) Extensible Markup Language (XML), and leverages the web paradigm for application development and deployment. By having a common language, application developers, platform vendors, and tool providers all can benefit from code portability and reuse.

With VoiceXML, speech recognition application development is greatly simplified by using familiar web infrastructure, including tools and Web servers. Instead of using a PC with a Web browser, any telephone can access VoiceXML applications via a VoiceXML "interpreter" (also known as a "browser") running on a telephony server. Whereas HTML is commonly used for creating graphical Web applications, VoiceXML can be used for voice-enabled Web applications.

There are two schools of thought regarding the use of VoiceXML:

1. As a way to voice-enable a Web site, or
2. As an open-architecture solution for building next-generation interactive voice response telephone services.

One popular type of application is the voice portal, a telephone service where callers dial a phone number to retrieve information such as stock quotes, sports scores, and weather reports. Voice portals have received considerable attention lately, and demonstrate the power of speech recognition-based telephone services. These, however, are certainly not the only application for VoiceXML. Other application areas, including voice-enabled intranets and contact centers, notification services, and innovative telephony services, can all be built with VoiceXML.

By separating application logic (running on a standard Web server) from the voice dialogs (running on a telephony server), VoiceXML and the voice-enabled Web allow for a new business model for telephony applications known as the Voice Service Provider. This permits developers to build phone services without having to buy or run equipment.

While originally designed for building telephone services, other applications of VoiceXML, such as speech-controlled home appliances, are starting to be developed.


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