SIP IM client

Hi,

I am trying to develop an IM client based on SIP and Java. Since I was unsuccessful in finding a good tutorial regarding this field, I am trying the trial-and-error approach.

I have a SIP-proxy (Based on OpenSER), and what I am trying to create is a client who will connect and stay connected to this server and hopefully print out the messages.

So for starters I tried to send a <REGISTER> command to the server with my login and password, but all I getin my command prompt is <null>.

Can someone please give me a push on the right direction?

Thank you
Quintus





-------------------- CODE -------------------------
import javax.sip.SipListener;
import java.io.*;
import javax.sip.*;
import javax.sip.address.*;
import javax.sip.header.*;
import javax.sip.message.*;
import java.util.*;
import gov.nist.javax.sip.address.*;
import gov.nist.javax.sip.header.*;
import java.lang.Object;


public class sipClient implements SipListener {
	Properties properties = new Properties();
	SipStack sipStack = null;
	SipFactory sipFactory = null;
	SipProvider sipProvider = null;
	AddressFactoryImpl addressFactoryImpl = null;
	Address address = null;
	SipURI sipURI = null;
	Request request = null;
	MessageFactory messageFactory = null;
	AddressFactory addressFactory = null;
	CallIdHeader callIdHeader = null;
	CSeqHeader cSeqHeader = null;
	FromHeader fromHeader = null;
	ToHeader toHeader = null; 
	ClientTransaction clientTransaction = null;
	
	public sipClient(){
		try{
			properties.setProperty("javax.sip.IP_ADDRESS", "127.0.0.1");
			properties.setProperty("javax.sip.OUTBOUND_PROXY", "192.168.1.99:5070/UDP");
			sipStack = sipFactory.createSipStack(properties);
			sipURI.setHost("192.168.1.99");
			sipURI.setPort(5070);
			sipURI.setUser("xTrade Client");
			sipURI.setUserPassword("123");
			//sipURI = addressFactory.createSipURI("100", "127.0.0.1");
			callIdHeader.setCallId("Xtrade");
			cSeqHeader.setSequenceNumber(4371);
			address.setDisplayName("JAG");
			fromHeader.setAddress(address);
			Address add = null;
			add.setURI(sipURI);
			toHeader.setAddress(add);
			List viaHeadersList = new ArrayList();
			ViaHeader viaHeaders = null;
			viaHeaders.setProtocol("SIP/2.0");
			viaHeaders.setHost("192.168.1.99");
			viaHeaders.setPort(5070);
			viaHeadersList.add(viaHeaders);
			MaxForwards maxForwards = new MaxForwards();
			maxForwards.setMaxForwards(70);
			SipURI requestURI = addressFactory.createSipURI("100", "127.0.0.1");
			//request = messageFactory.createRequest(Request.REGISTER);
			//request = messageFactory.createRequest(requestURI, method, callId, cSeq, from, to, via, maxForwards, contentType, content);
			request = messageFactory.createRequest(requestURI, Request.REGISTER, callIdHeader,cSeqHeader, fromHeader, toHeader, viaHeadersList, maxForwards);
			clientTransaction = sipProvider.getNewClientTransaction(request);
			clientTransaction.sendRequest();
		}catch(Exception e){
			System.err.println(e.getMessage());
		}
	}
	public void processDialogTerminated(DialogTerminatedEvent dialogTerminatedEvent){
		
	}
	public void processIOException(IOExceptionEvent exceptionEvent){
		System.out.println(exceptionEvent.toString());
	}
	public void processRequest(RequestEvent requestEvent){
		
	}
	public void processResponse(ResponseEvent responseEvent){
		
	}
	public void processTimeout(TimeoutEvent timeoutEvent){
		
	}
	public void processTransactionTerminated(TransactionTerminatedEvent transactionTerminatedEvent){
		
	}
	public static void main(String [] args){
		sipClient sc = new sipClient();
	}
}

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