Recent advances in speech processing technologies and the emergence of the VoiceXML computer language are increasing the adoption of speech applications that assist telephone and mobile phone users to perform useful tasks, such as installing equipment and diagnosing and repairing problems. This article describes the principles for phrasing voice prompts that encourage the user to speak or perform specific actions, for identifying the words and phrase that callers may speak in response to a prompt, and for assisting callers who fail to respond appropriately to a prompt. A programmer will then convert this information into a VoiceXML application by coding each prompt and response using VoiceXML 2.0/2.1.
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