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VoiceXML

This version was saved 17 years, 11 months ago View current version     Page history
Saved by PBworks
on April 21, 2006 at 7:43:58 am
 

The ubiquitous "Hello, World" program ;-)

 

<vxml version = "2.1" >
  <form>
    <block>
    <prompt>
      Hello World. This is my first telephone application.
    </prompt>
    </block>
  </form>
</vxml>

 

To deply this voice application, we need a voice platform. Voxeo provides a free service for developers to host their VoiceXML and maps it to a toll-free 800+PIN service, a direct-inward-dial (DID) number, a skype ID, as well as a SIP number. However, voxeo only supports static VXMLs for this free service. Using our own voice platform is a better idea. Or otherwise, you can go for Voxeo and others' paid services.

 

Next, filling up a field using speech recognition:

 

<vxml version="2.0">
  <form>
  <field name="BoyBand">
    <prompt>Please enter the name of your favorite boy band</prompt>
      <grammar type="text/gsl"> [ (en sink) hansen (sweet hearts) (kill me now)] </grammar>
  </field>
  </form>
</vxml>

 

 

 

Voicexml voice recognition is not dictation style at all, in that it uses a predefined set of grammars, which describe a list of things the person can say at a given point. This is called "Command-And-Control" style rather than the "Dictation" style. The above grammer is in Nuance GSL format rather than W3C SRGS format.

 

<noinput>
        <prompt>I did not hear anything.  Please try again.</prompt>
        <reprompt/>
</noinput>
 
<nomatch>
        <prompt>I did not recognize that character.  Please try again.</prompt>
        <reprompt/>
</nomatch>

 

How to take action depending on user's input?

 

<filled namelist="SouthParkCharacter">
      <if cond="SouthParkCharacter == 'kenny'">
            <prompt>Kenny has more lives than a cat.</prompt>
      <elseif cond="SouthParkCharacter == 'cartman'"/>
            <prompt>Cartman is not fat.  He is big boned.</prompt>
      </if>
</filled>

 

Other important points:

1. Good practice: Minimize TTS. Use audio prompts.

2. Support barge-in.

3. Avoid IVR style menus. Give the user a little freedom.

4. Dynamic application using PHP/JSP/ASP.

 

My work:

1. Using browser simulation to get the data from existing web applications and present it over the telephone.

2. Example: IIM results

3. No changes required in the existing application.

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