Sip authentification Jsr180

bonjour je developpe actuellement un softphone avec l'api jsr180, j'essaye de faire l'authentification aupres du serveur sip de ippi.fr mais j'arrive pas, je suis débutant en j2me:(, dans ce code j'ai essayé de faire des system.out.println pour savoir d'ou viens l'erreur et ca me donne 000, merci pour l'aide.
Code:
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package com.example.SipTest;
 
import javax.microedition.io.Connector;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
import javax.microedition.sip.SipClientConnection;
import javax.microedition.sip.SipConnectionNotifier;
import javax.microedition.sip.SipHeader;
 
 
 
public class Register extends MIDlet {
 
	//send the REGISTER and handle the authentication responses
	public void doRegister(String username, String password, String realm) {
 
		  SipClientConnection scc = null;
		  SipConnectionNotifier scn = null;
		  String contact = null;	
		  try {
		      // open listener in application specific port 5080
		      scn = (SipConnectionNotifier) Connector.open("sip:5080");
 
		      // build the contact URI
		      contact = 
				new String("sip:user@"+scn.getLocalAddress()+":"+scn.getLocalPort());
		      System.out.println("contact:"+contact);  
		      // open client connection to the SIP registrar 
		      scc = (SipClientConnection) Connector.open("sip:ippi.fr");
 
		      // initialize REGISTER with appropriate headers
		      scc.initRequest("REGISTER", scn);
		      scc.setHeader("From", "sip:taoufik109@ippi.fr");
		      scc.setHeader("To", "sip:ouahbi1986@ippi.fr");
		      scc.setHeader("Contact", contact);
 
		      scc.send();
 
		      boolean handled = false;
		      int scode = 0;
 
		      while(!handled) {
		          SipHeader sh;
		          // wait max 15 secs for response
		          scc.receive(15000);
		          scode = scc.getStatusCode();
		          switch(scode)
		          {
		              case 401:
		                  sh = new SipHeader("WWW-Authenticate",
		                     scc.getHeader("WWW-Authenticate"));
		                  realm = sh.getParameter("realm");                
		                  // here for example, prompt user for password for this realm
		                  // set credentials to initiate re-REGISTER
		                  scc.setCredentials("mon username","mon password","ippi.fr");
		                  System.out.println("401");  
		                  break;
 
		              case 407:
		                  sh = new SipHeader("Proxy-Authenticate", 
		                     scc.getHeader("Proxy-Authenticate"));
		                  realm = sh.getParameter("realm");                
		                  // here for example, prompt user for password for this realm
		                  // set credentials to initiate re-REGISTER
		                  scc.setCredentials("mon username","mon password","ippi.fr");
		                  System.out.println("407");  
		                  break;
 
		              case 200:
		                  // handle OK response
		                  handled = true;
		                  System.out.println("200"); 
		                  break;
		              default:
		                  // handle other responses
		                  handled = true;
		                  System.out.println("000"); 
		          }  
		      }
		      scc.close();
		  } catch(Exception ex) {
		      // handle Exceptions
		  }
		 }
 
	public Register() {
		// TODO Auto-generated constructor stub
	}
 
	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
		// TODO Auto-generated method stub
 
	}
 
	protected void pauseApp() {
		// TODO Auto-generated method stub
 
	}
 
	protected void startApp() throws MIDletStateChangeException {
		doRegister("taoufik109", "taoufik2010", "ippi.fr");
	}
}