Thread: Serail Port Programming regarding phone line hook

Hello everyone,

I am just trying my hands in Serial port programming using javax.comm package.

I am sorry if I will not be able to explain you my scenario but I will try my best to explain my problem.

I have 56k internal modem connected to my computer and its assigned with COM 6. Telephone is connected to the modem. I want to write a simple application which will hook the telephone after 2 ring and receive the message which is sent through the telephone line.

I found few example in the internet but those examples cant hook the telephone. On the output screen it will only display as:

RING

RING

RING

RING

On the another end, I have device which will dial to the phone number connected to my computer modem. What My device will expect is, my program needs to hook the call after 2 ring then it will send some message to my program.My program needs to hook the call after 2 ring and need to receive the message comming from device after 2 ring.

One of the example is;

import java.io.*;
import java.util.*;
import javax.comm.*;
 
public class SimpleRead implements Runnable, SerialPortEventListener {
    static CommPortIdentifier portId;
    static Enumeration portList;
 
    static OutputStream outputStream;
	static InputStream inputStream;
	FileInputStream fis = null;
    SerialPort serialPort;
    Thread readThread;
	int ch;
 
    public static void main(String[] args) {
        portList = CommPortIdentifier.getPortIdentifiers();
 
        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                 if (portId.getName().equals("COM6")) {
					 System.out.println("checked");
			//                if (portId.getName().equals("/dev/term/a")) {
                    SimpleRead reader = new SimpleRead();
                }
            }
        }
    }
 
    public SimpleRead() {
        try {
            serialPort = (SerialPort) portId.open("SimpleReadApp", 2000);
        } catch (PortInUseException e) {System.out.println(e);}
        try {
            inputStream = serialPort.getInputStream();
        } catch (IOException e) {System.out.println(e);}
	try {
            serialPort.addEventListener(this);
	} catch (TooManyListenersException e) {System.out.println(e);}
				serialPort.notifyOnDataAvailable(true);
				serialPort.notifyOnCarrierDetect(true);
				serialPort.notifyOnDataAvailable(true);
				serialPort.notifyOnBreakInterrupt(true);
				serialPort.notifyOnCTS(true);
				serialPort.notifyOnDSR(true);
				serialPort.notifyOnFramingError(true);
				serialPort.notifyOnOutputEmpty(true);
				serialPort.notifyOnOverrunError(true);
				serialPort.notifyOnParityError(true);
				serialPort.notifyOnRingIndicator(true);
        try {
            serialPort.setSerialPortParams(9600,SerialPort.DATABITS_8,SerialPort.STOPBITS_1,SerialPort.PARITY_NONE);
        } catch (UnsupportedCommOperationException e) {System.out.println(e);}
        readThread = new Thread(this);
        readThread.start();
    }
 
    public void run() {
        try {
            Thread.sleep(2000);
        } catch (InterruptedException e) {System.out.println(e);}
    }
 
    public void serialEvent(SerialPortEvent event) {
        switch(event.getEventType()) {
        case SerialPortEvent.BI:
 
			System.out.println("Break Interrupt");
				break;
        case SerialPortEvent.OE:
        case SerialPortEvent.FE:
        case SerialPortEvent.PE:
 
        case SerialPortEvent.CTS:
 
        case SerialPortEvent.DSR:
        case SerialPortEvent.RI:
 
 
 
			System.out.println("Pick up the receiver.");
				if( event.getNewValue() ) 
				{
					System.out.println("Ring Indicator On");
				}
				else 
				{
					System.out.println("Ring Indicator Off");
				}
				break;
		case SerialPortEvent.CD:
 
			if( event.getNewValue() ) 
				{
					System.out.println("Connected");
 
				}
				else 
				{
					System.out.println("Disconnected");
					System.exit(0);
				}
				break;
 
        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
            break;
        case SerialPortEvent.DATA_AVAILABLE:
			 try {
	//		outputStream.write("ata".getBytes());
            byte[] readBuffer = new byte[5048];
 
 
                while (inputStream.available() > 0) {
		//			outputStream.write("ata".getBytes());	// to hook the phone
		//			System.out.println("ram");
                    int numBytes = inputStream.read(readBuffer);
                }
 
                System.out.print(new String(readBuffer));
				outputStream.write("ata".getBytes());
 
            } catch (IOException e) {System.out.println(e);}
            break;
        }
    }
}

It would be very helpful if anyone can help me in this issue.
Thanks in advance.

Hello maskey_dipesh.

Welcome to the Java Programming Forums.

I have no experience with serial port programming. Hopefully someone else can help you soon.

JAVA: Serial Port access with javax.comm or rxtx on Windows, Linux etc.