1. What is voice xml?

   1. VoiceXML is a declarative, XML-based language markup language for writing telephone-based speech applications. Users call applications by telephone. They listen to spoken instructions and questions; they provide input using the spoken word and the touchtone keypad.

2. What does a VoiceXML interpreter do?

These are some of the frequently asked questions during VXML interviews. Most questions here are copied from our initial vxml website (vxmlfaq.com) FAQ page compiled mainly by Sheeba. This page will also contain user submissions which might not be verified in all cases; hence if you find any mistake or issues with the answers, please do contact us and we will make necessary changes.

Here you will find a small introduction to some of the important concepts of the vxml language like strutcture of a vxml document, application and application root document, dialogs, forms, subdialogs, session, grammars, events, links and utterance.

Structure of a VXML document

The <vxml> tag is the root tag of a vxml application. Basic structure of a VXML document is as follows:

<?xml version="1.0"?>

There are three major components in general vxml architecture: a web server, the VoiceXML interpreter context, and the implementation platform. 

The origins of VoiceXML began in 1995 as an XML-based dialog design language intended to simplify the speech recognition application development process within an AT&T project called Phone Markup Language (PML). 

As AT&T reorganized, teams at AT&T, Lucent and Motorola continued working on their own PML-like languages.