How to continually reregister using Jain SIP?

Question

I currently use Jain-Sip to successfully send a REGISTER request and get a 401 UnAuth back, I then use the nonce to generate the response and send it back and I successfully get a 200 OK response.
However when I go to re register again I cant seem to be able to send the request again, I keep getting null pointer exceptions.
Here is my code:
public class CSip extends Activity implements javax.sip.SipListener {
     private static AddressFactory addressFactory;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        digest = new DigestClientAuthenticationMethod();
        myAddress = getLocalIpAddress();
        tv = new TextView(this);  
        setContentView(tv);
             try {
                init(tv);
                register();
             } catch (Exception ex) {
                tv.append("Unxpected exception " + ex.getMessage());
                ex.printStackTrace();
    super.finish();
    public void init(TextView tv) throws Exception {
          SipFactory sipFactory = null;
          sipStack = null;
          sipFactory = SipFactory.getInstance();
          sipFactory.setPathName("gov.nist");
          Properties properties = new Properties();
          properties.setProperty("javax.sip.STACK_NAME", "Sip_Test");
          // Create SipStack object
          sipStack = sipFactory.createSipStack(properties);
          tv.setText("sipStack = " + sipStack);
          headerFactory = sipFactory.createHeaderFactory();
          addressFactory = sipFactory.createAddressFactory();
          messageFactory = sipFactory.createMessageFactory();
          lp = sipStack.createListeningPoint(getLocalIpAddress(),
                    8002, ListeningPoint.UDP);
          if(sipProvider == null){
          sipProvider = sipStack.createSipProvider(lp);
          sipOnOffFlag = true;
          tv.append("\n jain sip stack started on " + getLocalIpAddress() + ":" + myPort + "/" + ListeningPoint.UDP + " ");
          sipProvider.addSipListener(this);
          Log.d("INIT", "SipProvider = : " + sipProvider.toString());
    public void register()throws Exception{
          String fromName = "xxxxxxxx";
          String fromSipAddress = "sip.network.com";
          String toSipAddress = "sip.network.com";
          String toUser = "xxxxxxxx";
          SipURI fromAddress = addressFactory.createSipURI(fromName,
                    fromSipAddress);
          Address fromNameAddress = addressFactory.createAddress(fromAddress);
          FromHeader fromHeader = headerFactory.createFromHeader(
                    fromNameAddress, null);
          SipURI toAddress = addressFactory
                    .createSipURI(toUser, toSipAddress);
          Address toNameAddress = addressFactory.createAddress(toAddress);
          ToHeader toHeader = headerFactory.createToHeader(toNameAddress,
                    null);
          URI requestURI = addressFactory.createURI(
                    "sip:" + "sip.network.com");
          List<ViaHeader> viaHeaders = new ArrayList<ViaHeader>();
          String ipAddress = lp.getIPAddress();
          ViaHeader viaHeader = headerFactory.createViaHeader(ipAddress,
                    lp.getPort(),
                    lp.getTransport(), null);
          viaHeaders.add(viaHeader);
          CallIdHeader callIdHeader = sipProvider.getNewCallId();
          CSeqHeader cSeqHeader = headerFactory.createCSeqHeader(1L,
                    Request.REGISTER);
          MaxForwardsHeader maxForwards = headerFactory
                    .createMaxForwardsHeader(70);
          Request request = messageFactory.createRequest(requestURI,
                    Request.REGISTER, callIdHeader, cSeqHeader, fromHeader,
                    toHeader, viaHeaders, maxForwards);
          SipURI contactUrl = addressFactory.createSipURI(fromName, fromSipAddress);
          contactUrl.setPort(8002);
          contactUrl.setLrParam();
          SipURI contactURI = addressFactory.createSipURI(fromName, "sip.network.com");
          contactURI.setPort(sipProvider.getListeningPoint(lp.getTransport())
                    .getPort());
          Address contactAddress = addressFactory.createAddress(contactURI);
          contactHeader = headerFactory.createContactHeader(contactAddress);
          request.addHeader(contactHeader);
          Header extensionHeader = headerFactory.createHeader("Expires",
               "120");
          request.addHeader(extensionHeader);
          Log.d("SIP", "" + request.toString());
          // Create the client transaction.
          Log.d("BEFORE TID", "SipProvider = : " + sipProvider.toString());
          inviteTid = sipProvider.getNewClientTransaction(request);
          inviteTid.sendRequest();
          Log.d("AFTERSENDREQUEST", "SipProvider = : " + sipProvider.toString());
          Log.d("INVITETID", "inviteTid = " + inviteTid.getState());
          dialog = inviteTid.getDialog();
     public void processResponse(ResponseEvent responseEvent) {
          Log.d("RESPONSE", "response " + responseEvent.getResponse());
          Message message = Message.obtain();
          message.obj = "received response "+responseEvent.getResponse();
          handler.sendMessage(message);     
          Response response = (Response) responseEvent.getResponse();
          ClientTransaction tid = responseEvent.getClientTransaction();
          CSeqHeader cseq = (CSeqHeader) response.getHeader(CSeqHeader.NAME);                    
          Log.d("STATUS CODE", "status code = " + response.getStatusCode());
          Log.d("STATUS CODE", "header code = " + response.getHeader("WWW-Authenticate"));
          Log.d("STATUS CODE", "reason code = " + response.getReasonPhrase());
          CallIdHeader callid = (CallIdHeader) response.getHeader("Call-ID");
          WWWAuthenticate wwwAuth = (WWWAuthenticate) response.getHeader("WWW-Authenticate");
          Log.d("STATUS NONCE", ", nonce : " + wwwAuth.getNonce());
          Log.d("STATUS NONCE", "nonce : " + wwwAuth.getNonce());
          String nonce = wwwAuth.getNonce();
          String cNonce = wwwAuth.getCNonce();
          Log.d("STATUS ", "cnonce : " + cNonce);
          String realm = wwwAuth.getRealm();
          Log.d("STATUS ", "realm : " + realm);
          String method = wwwAuth.getQop();
          Log.d("STATUS", "method : " + method);
          String alg = wwwAuth.getAlgorithm();
          Log.d("STATUS", "alg : " + alg);
          String authResponse = null;
          AuthorizationHeader authHeader = null;
          try {
               digest.initialize(realm,"xxxxxxxx","sip:sip.network.com",
                         nonce,"xxxxxxx", "REGISTER",null, alg);
               Log.d("GENRESPONSE", "" + digest.generateResponse());
               authResponse = digest.generateResponse();
          } catch (Exception e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          try {
                authHeader = headerFactory.createAuthorizationHeader("Digest");
                authHeader.setUsername("xxxxxxxx");
                authHeader.setRealm(realm);
                authHeader.setNonce(nonce);
                authHeader.setResponse(authResponse);
                authHeader.setAlgorithm(alg);
                URI authURI = addressFactory.createURI(
                              "sip:" + "sipnetworks.com");
                authHeader.setURI(authURI);
          } catch (ParseException e) {
               e.printStackTrace();
          Log.d("AUTH HEADER", "Auth Header = " + authHeader);
          if (response.getStatusCode() == Response.UNAUTHORIZED){
          try {
               authHeader.setNonceCount(1);
               createAuthReply(authHeader, callid);
          } catch (Exception e) {
               e.printStackTrace();
          scheduleReRegistration(120, callid);     
     }

Answer 1

I have tried putting in my register() method several times and if I call the different register() methods,
so call register() then register2() then register3() it works this way.
But not if I simply put register() in a timer looping.
So there must be something I have to terminate and restart or something each time I run the method?
Edited by: draffodx on Feb 11, 2010 10:12 AM