/** The real task work, replace listening point. */
    public void run() {
      // if the provider is still unregistering it most probably won't
      // successes until we re-init the LP
      if (protocolProvider.getRegistrationState() == RegistrationState.UNREGISTERING) {
        String transport = protocolProvider.getRegistrarConnection().getTransport();

        ListeningPoint old = getLP(transport);

        try {
          stack.deleteListeningPoint(old);
        } catch (Throwable t) {
          logger.warn("Error replacing ListeningPoint for " + transport, t);
        }

        try {
          ListeningPoint tcpLP =
              stack.createListeningPoint(
                  NetworkUtils.IN_ADDR_ANY,
                  transport.equals(ListeningPoint.TCP)
                      ? getPreferredClearPort()
                      : getPreferredSecurePort(),
                  transport);
          clearJainSipProvider.addListeningPoint(tcpLP);
        } catch (Throwable t) {
          logger.warn(
              "Error replacing ListeningPoint for "
                  + protocolProvider.getRegistrarConnection().getTransport(),
              t);
        }
      }

      resetListeningPointsTimers.remove(protocolProvider.getRegistrarConnection().getTransport());
    }
  /**
   * Removes from the specified list of candidates providers connected to a registrar that does not
   * match the IP address that we are receiving a request from.
   *
   * @param candidates the list of providers we've like to filter.
   * @param request the request that we are currently dispatching
   */
  private void filterByAddress(List<ProtocolProviderServiceSipImpl> candidates, Request request) {
    Iterator<ProtocolProviderServiceSipImpl> iterPP = candidates.iterator();
    while (iterPP.hasNext()) {
      ProtocolProviderServiceSipImpl candidate = iterPP.next();

      if (candidate.getRegistrarConnection() == null) {
        // RegistrarLess connections are ok
        continue;
      }

      if (!candidate.getRegistrarConnection().isRegistrarless()
          && !candidate.getRegistrarConnection().isRequestFromSameConnection(request)) {
        iterPP.remove();
      }
    }
  }
 /**
  * Notified when registration state changed for a provider.
  *
  * @param evt
  */
 public void registrationStateChanged(RegistrationStateChangeEvent evt) {
   if (evt.getNewState() == RegistrationState.UNREGISTERING) {
     new Timer().schedule(this, TIME_FOR_PP_TO_UNREGISTER);
   } else {
     protocolProvider.removeRegistrationStateChangeListener(this);
     resetListeningPointsTimers.remove(protocolProvider.getRegistrarConnection().getTransport());
   }
 }
  /**
   * Listens for network changes and if we have a down interface and we have a tcp/tls provider
   * which is staying for 20 seconds in unregistering state, it cannot unregister cause its using
   * the old address which is currently down, and we must recreate its listening points so it can
   * further reconnect.
   *
   * @param event the change event.
   */
  public void configurationChanged(ChangeEvent event) {
    if (event.isInitial()) return;

    if (event.getType() == ChangeEvent.ADDRESS_DOWN) {
      for (final ProtocolProviderServiceSipImpl pp : listeners) {
        if (pp.getRegistrarConnection().getTransport() != null
            && (pp.getRegistrarConnection().getTransport().equals(ListeningPoint.TCP)
                || pp.getRegistrarConnection().getTransport().equals(ListeningPoint.TLS))) {
          ResetListeningPoint reseter;
          synchronized (resetListeningPointsTimers) {
            // we do this only once for transport
            if (resetListeningPointsTimers.containsKey(pp.getRegistrarConnection().getTransport()))
              continue;

            reseter = new ResetListeningPoint(pp);
            resetListeningPointsTimers.put(pp.getRegistrarConnection().getTransport(), reseter);
          }
          pp.addRegistrationStateChangeListener(reseter);
        }
      }
    }
  }