Voice XML Based Answering Machine

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Voice XML Based Answering Machine

• Suraj

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Overview

• Software to use as answering machine
• Multiple voice messages based on the incoming
  call
• Set of menus to choose for the next option
• Store the information received from the caller in
  database
• Easy interface to store the set of questions

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Hardware requirements

• Intel Machine with windows 2000/XP
• Voice modem

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Software Requirements

• Windows 2000/XP
• IIS (Internet Information Server)
• ASP enabled
• MySQL
• TAPI and SAPI enabled
• Configure ODBC data source for connecting to DB

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Data Flow

• Every call comes gets hooked to the executable
  through TAPI call back function
• The executable for each call would connect to
  data source, retrieve the voice xml document for
  the call from the db
• Executable once retrieved the call would
  interpret the voice xml and communicate with the
  user

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Document Server

• Document Server is mysql database which has two
  tables for storing voice xml files and voice xml
  dialogs
• Interface to document server is using IIS and asp
• ASP connects to document server using ODBC
  connectivity

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Voice XML

• Voice extensible markup language
• W3W standard
• Interprets voice xml. Two types of dialogs
  supported
• Forms
• Menus
• Specification available at http//www.w3.org/TR/vo
  icexml20/

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Sample Voice XML Dialog

• Menu
• ltform id"index"gt
• ltmenu dtmf"true"gt
• ltpromptgt
• Welcome to main manu. Choose one of the
  following ltenumerate/gt
• lt/promptgt
• ltchoice next"grades"gt
• 1 for Grades
• lt/choicegt
• ltchoice next"courses"gt
• 2 for Courses offered
• lt/choicegt
• ltgoto form"choice"gt
• lt/menugt
• lt/formgt

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Sample Voice XML Dialog

• Forms
• ltform id"1"gt
• ltblockgt
• ltpromptgtplease enter your roll
  numberlt/promptgt
• ltget form"marks.asp" value"num"/gt
• lt/blockgt
• lt/formgt

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TAPI and SAPI

• Communicates with telephone through TAPI
• Converts text to speech using SAPI
• Records speech using SAPI

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TAPI initialization

• Using TAPI 3.0
• COM based interface
• CoCreateInstance(
• CLSID_TAPI,
• NULL,
• CLSCTX_INPROC_SERVER,
• IID_ITTAPI,
• (LPVOID )m_pTapi
• )

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SAPI initialization

• Instantiate instance of ISPVoice
• CoCreateInstance( CLSID_SpVoice )
• Check all Audio out and in on the system
• Assign each audio out and in to the
  CallMediaControl

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Database interface

• Interface through ASP
• IIS web server
• Virtual created
• ODBC connection for db connectivity
• Database MySql

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Summary

• Created IVR for Storing speech
• Created IVR for interface to database