public void processResponse(ResponseEvent responseReceivedEvent) {

    // Log.info("Registering response...." + sipCallId);

    Response response = (Response) responseReceivedEvent.getResponse();
    int statusCode = response.getStatusCode();
    String method = ((CSeqHeader) response.getHeader(CSeqHeader.NAME)).getMethod();

    Log.debug("Got response " + response);

    if (statusCode == Response.OK) {
      isRegistered = true;

      Log.info(
          "Voice bridge successfully registered with "
              + registrar
              + " for "
              + proxyCredentials.getXmppUserName());
      PluginImpl.sipRegisterStatus = "Registered ok with " + proxyCredentials.getHost();

      sipServerCallback.removeSipListener(sipCallId);

    } else if (statusCode == Response.UNAUTHORIZED
        || statusCode == Response.PROXY_AUTHENTICATION_REQUIRED) {

      if (method.equals(Request.REGISTER)) {
        CSeqHeader cseq = (CSeqHeader) response.getHeader(CSeqHeader.NAME);

        if (cseq.getSequenceNumber() < 2) {

          ClientTransaction regTrans =
              SipService.handleChallenge(
                  response, responseReceivedEvent.getClientTransaction(), proxyCredentials);

          if (regTrans != null) {
            try {
              regTrans.sendRequest();

            } catch (Exception e) {

              Log.info("Registration failed, cannot send transaction " + e);
              PluginImpl.sipRegisterStatus = "Registration error " + e.toString();
            }

          } else {
            Log.info("Registration failed, cannot create transaction");
            PluginImpl.sipRegisterStatus = "Registration cannot create transaction";
          }

        } else {
          Log.info("Registration failed " + responseReceivedEvent);
          PluginImpl.sipRegisterStatus = "Registration failed";
        }
      }

    } else {
      Log.info("Unrecognized response:  " + response);
    }
  }
  public void unregister() throws IOException {
    if (!isRegistered) {
      return;
    }

    cancelPendingRegistrations();
    isRegistered = false;

    if (this.registerRequest == null) {
      Log.info("Couldn't find the initial register request");
      throw new IOException("Couldn't find the initial register request");
    }

    Request unregisterRequest = (Request) registerRequest.clone();

    try {
      unregisterRequest.getExpires().setExpires(0);
      CSeqHeader cSeqHeader = (CSeqHeader) unregisterRequest.getHeader(CSeqHeader.NAME);
      // [issue 1] - increment registration cseq number
      // reported by - Roberto Tealdi <*****@*****.**>
      cSeqHeader.setSequenceNumber(cSeqHeader.getSequenceNumber() + 1);
    } catch (InvalidArgumentException e) {
      Log.info("Unable to set Expires Header " + e.getMessage());
      return;
    }

    ClientTransaction unregisterTransaction = null;

    try {
      unregisterTransaction = sipProvider.getNewClientTransaction(unregisterRequest);
    } catch (TransactionUnavailableException e) {
      throw new IOException("Unable to create a unregister transaction " + e.getMessage());
    }
    try {
      unregisterTransaction.sendRequest();
    } catch (SipException e) {
      Log.info("Faied to send unregister request " + e.getMessage());
      return;
    }
  }
  /**
   * Implements {@link MethodProcessor#processResponse(ResponseEvent)}. Handles only responses to
   * SUBSCRIBE requests because they are the only requests concerning event package subscribers (and
   * the only requests sent by them, for that matter) and if the processing of a given response
   * requires event package-specific handling, delivers the response to the matching
   * <tt>Subscription</tt> instance. Examples of such event package-specific handling include
   * letting the respective <tt>Subscription</tt> handle the success or failure in the establishment
   * of a subscription.
   *
   * @param responseEvent a <tt>ResponseEvent</tt> specifying the SIP <tt>Response</tt> to be
   *     processed
   * @return <tt>true</tt> if the SIP <tt>Response</tt> specified by <tt>responseEvent</tt> was
   *     processed; otherwise, <tt>false</tt>
   */
  @Override
  public boolean processResponse(ResponseEvent responseEvent) {
    Response response = responseEvent.getResponse();

    CSeqHeader cseqHeader = (CSeqHeader) response.getHeader(CSeqHeader.NAME);
    if (cseqHeader == null) {
      logger.error("An incoming response did not contain a CSeq header");
      return false;
    }
    if (!Request.SUBSCRIBE.equals(cseqHeader.getMethod())) return false;

    ClientTransaction clientTransaction = responseEvent.getClientTransaction();
    Request request = clientTransaction.getRequest();

    /*
     * Don't handle responses to requests not coming from this event
     * package.
     */
    if (request != null) {
      EventHeader eventHeader = (EventHeader) request.getHeader(EventHeader.NAME);
      if ((eventHeader == null) || !eventPackage.equalsIgnoreCase(eventHeader.getEventType()))
        return false;
    }

    // Find the subscription.
    CallIdHeader callIdHeader = (CallIdHeader) response.getHeader(CallIdHeader.NAME);
    String callId = callIdHeader.getCallId();
    Subscription subscription = getSubscription(callId);

    // if it's the response to an unsubscribe message, we just ignore it
    // whatever the response is however if we need to handle a
    // challenge, we do it
    ExpiresHeader expHeader = response.getExpires();
    int statusCode = response.getStatusCode();
    SipProvider sourceProvider = (SipProvider) responseEvent.getSource();
    if (((expHeader != null) && (expHeader.getExpires() == 0))
        || (subscription == null)) // this handle the unsubscription
    // case where we removed the contact
    // from subscribedContacts
    {
      boolean processed = false;

      if ((statusCode == Response.UNAUTHORIZED)
          || (statusCode == Response.PROXY_AUTHENTICATION_REQUIRED)) {
        try {
          processAuthenticationChallenge(clientTransaction, response, sourceProvider);
          processed = true;
        } catch (OperationFailedException e) {
          logger.error("can't handle the challenge", e);
        }
      } else if ((statusCode != Response.OK) && (statusCode != Response.ACCEPTED)) processed = true;

      // any other cases (200/202) will imply a NOTIFY, so we will
      // handle the end of a subscription there
      return processed;
    }

    if ((statusCode >= Response.OK) && (statusCode < Response.MULTIPLE_CHOICES)) {
      // OK (200/202)
      if ((statusCode == Response.OK) || (statusCode == Response.ACCEPTED)) {
        if (expHeader == null) {
          // not conform to rfc3265
          logger.error("no Expires header in this response");
          return false;
        }

        SubscriptionRefreshTask refreshTask = new SubscriptionRefreshTask(subscription);
        subscription.setTimerTask(refreshTask);

        int refreshDelay = expHeader.getExpires();
        // try to keep a margin if the refresh delay allows it
        if (refreshDelay >= (2 * refreshMargin)) refreshDelay -= refreshMargin;
        timer.schedule(refreshTask, refreshDelay * 1000);

        // do it to remember the dialog in case of a polling
        // subscription (which means no call to finalizeSubscription)
        subscription.setDialog(clientTransaction.getDialog());

        subscription.processSuccessResponse(responseEvent, statusCode);
      }
    } else if ((statusCode >= Response.MULTIPLE_CHOICES) && (statusCode < Response.BAD_REQUEST)) {
      if (logger.isInfoEnabled())
        logger.info(
            "Response to subscribe to "
                + subscription.getAddress()
                + ": "
                + response.getReasonPhrase());
    } else if (statusCode >= Response.BAD_REQUEST) {
      // if the response is a 423 response, just re-send the request
      // with a valid expires value
      if (statusCode == Response.INTERVAL_TOO_BRIEF) {
        MinExpiresHeader min = (MinExpiresHeader) response.getHeader(MinExpiresHeader.NAME);

        if (min == null) {
          logger.error("no minimal expires value in this 423 " + "response");
          return false;
        }

        ExpiresHeader exp = request.getExpires();

        try {
          exp.setExpires(min.getExpires());
        } catch (InvalidArgumentException e) {
          logger.error("can't set the new expires value", e);
          return false;
        }

        ClientTransaction transac = null;
        try {
          transac = protocolProvider.getDefaultJainSipProvider().getNewClientTransaction(request);
        } catch (TransactionUnavailableException e) {
          logger.error("can't create the client transaction", e);
          return false;
        }

        try {
          transac.sendRequest();
        } catch (SipException e) {
          logger.error("can't send the new request", e);
          return false;
        }

        return true;
        // UNAUTHORIZED (401/407)
      } else if ((statusCode == Response.UNAUTHORIZED)
          || (statusCode == Response.PROXY_AUTHENTICATION_REQUIRED)) {
        try {
          processAuthenticationChallenge(clientTransaction, response, sourceProvider);
        } catch (OperationFailedException e) {
          logger.error("can't handle the challenge", e);

          removeSubscription(callId, subscription);
          subscription.processFailureResponse(responseEvent, statusCode);
        }
        // 408 480 486 600 603 : non definitive reject
        // others: definitive reject (or not implemented)
      } else {
        if (logger.isDebugEnabled()) logger.debug("error received from the network:\n" + response);

        removeSubscription(callId, subscription);
        subscription.processFailureResponse(responseEvent, statusCode);
      }
    }

    return true;
  }