Building An IVRS Application

Very good article! Easy to understand, good for beginners like me!
Thanx for the article.

Very simple step by step explanation for building IVRS. Though it did not mention exact hardware required.

Hi Uttam Pegu,
I am a student from Chennai, India. I want to do a project which is Building an IVRS for a College! For example if user press 1 they should have a voice response about the student……if 2 voice response about the various dept. etc. So can you please tell me exactly which modem(like modem name or no) should i use to attend the call automatically and get the keypad number dialled by the user. If possible please provide me a brief idea on my project as soon as possible as its late me doing my project! Thank you.

Thank you Uttam Pegu! How to automatically attend a call? Is it done once we have a modem? Then what is the use of XTEND IVR tool? Similarly will the keypad number typed by user be retrieved when we have a modem? Please help me with this!

Hi Vinoth,
Sorry for the late reply.

To reply “How to automatically attend a call ?”
1. Your program keep listening for incoming RINGING and as soon as your program detects it, it will “pick” the call by OFF HOOKing it!
2. ExtendIVR tool a used to “control” dialogic board for performing above #1 operations in your C++,.NET programs.
3. Yes, you can detect telephone keypad pressed by caller ( DTMF )

Donjin costs half the price of Dialogic! 4 port Dialogic should cost around Rs. 30000 or so. ( my estimate, have not bought any recently.).

my mail ID is sivaramsrk@gmail.com

Thank you Mr.Uttam Pegu.
1.Can you name any one Voice modem and its approximate price??
2.Is there any programming interface for that modem??

thank you

Hi Jeeva,
You may use any voice modem, either built in into your laptop or any external or internal modem to be installed in PC.

TAPI ( Telephony API) is widely used for Modem.

Hi Uttam Pegu,
I have decided to use a voice modem for the IVRS as my company wants to offer me only that for now. So could you please specify me the exact model or name of the voice modem that i can use so that my IVRS works in a good way! Please help me with this!
Thank you.

Thank you Mr.Uttam Pegu

Hi Jeeva,
No gadget can claim to detect DTMF 100% accurately as it depends on lot many things including signal/line conditions! So, you will always have CLI detection in any analog boards, including modems.

All modems are equally suitable or otherwise, thumbrule might be costlier would be better!

Now I am going to use any one Voice modem !! I will reply you soon whether it works properly or not.

sry….
here is my correct code…
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;
using System.Threading;
using System.Text.RegularExpressions;
using System.IO;

namespace ivr
{
public partial class Form1 : Form
{
public string s;
public AutoResetEvent receiveNow = new AutoResetEvent(false);
public SerialPort sp1 = new SerialPort();

byte[] buff = new byte[1024];
int i = 0;

public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{

//System.IO.FileStream strm= new System.IO.FileStream(“C:\\sk.wav”,System.IO.FileMode.Open);
//System.IO.BinaryReader rdr=new System.IO.BinaryReader(strm);

FileStream fs = new FileStream(“C:\\sk.wav”, FileMode.Open, FileAccess.Read);
BinaryReader br = new BinaryReader(fs);
long numbytes = new FileInfo(“C:\\sk.wav”).Length;
buff = br.ReadBytes(1024);//((int)numbytes);
MessageBox.Show(numbytes.ToString());
//for(i=0;i 0)
// throw new ApplicationException(“Response received is incomplete.”);
// else
// throw new ApplicationException(“No data received from phone.”);
// }
}
while (!buffer.EndsWith(“\r\nOK\r\n”) && !buffer.EndsWith(“\r\n> “) && !buffer.EndsWith(“\r\nERROR\r\n”));
}
catch (Exception ex)
{
throw ex;
}
return buffer;
}

private void Form1_Load(object sender, EventArgs e)
{

//System.IO.FileStream strm= new System.IO.FileStream(“C:\\sk.wav”,System.IO.FileMode.Open);
//System.IO.BinaryReader rdr=new System.IO.BinaryReader(strm);

FileStream fs = new FileStream(“C:\\sk.wav”, FileMode.Open, FileAccess.Read);
BinaryReader br = new BinaryReader(fs);
long numbytes = new FileInfo(“C:\\sk.wav”).Length;
buff = br.ReadBytes(1024);//((int)numbytes);
MessageBox.Show(numbytes.ToString());
//for(i=0;i<buff.Length;i++)
// MessageBox.Show(BitConverter.ToString(buff) );
MessageBox.Show("file reading finished…");

sp1.PortName="COM3";
sp.BaudRate = 115200;
sp.DataBits = 8;
sp.StopBits = System.IO.Ports.StopBits.One;
sp.Parity = System.IO.Ports.Parity.None;
sp.Handshake = System.IO.Ports.Handshake.None;
sp.DtrEnable = true;
sp1.Open();
sp1.DiscardOutBuffer();
sp1.DiscardInBuffer();
receiveNow.Reset();
MessageBox.Show("port initialization finished…");

public string ReadResponse(SerialPort port, int timeout)
{
string buffer = string.Empty;

do
{
string t = port.ReadExisting();
buffer += t;
}
while (!buffer.EndsWith(“\r\nOK\r\n”) && !buffer.EndsWith(“\r\n> “) && !buffer.EndsWith(“\r\nERROR\r\n”));
}

Hi Jeeva,
I am not sure how one plays WAV file using AT commands!

I think, you will have to use TAPI instead of AT commands.

hii Uttam Pegu
I have successfully completed my project using TAPI calsses.
Thank you so much for your kind help!!
Regards,
-Jeeva