W3C Specifications
- Describe potential dialogue with system:
    VoiceXML
 
- Control speech generation: Speech Synthesis Markup
    Language
- text2speech
 
- recorded
  audio
 
 
- Describe legal user responses: Speech
  Grammar
 
- Process user input: Semantic
    Interpretation
 
- Call control: Markup for call screening, whisper
    call waiting, call transfer, ...