private boolean isValidAddress(String userId, String serviceId) {
   if (userId == null || "".equals(userId) || serviceId == null || "".equals(serviceId)) {
     // System.out.println("Source/dest address NULL --> PDU discarded");
     return false;
   }
   if (!Preference.isValidServiceId(serviceId)) {
     // System.out.println("Invalid dest address:" + serviceId
     // + " --> PDU discarded");
     return false;
   }
   if (userId.startsWith("849") || userId.startsWith("+849") || userId.startsWith("09")) {
     return true;
     // TrungDK EVN -> UNKNOWN
   } else if ("UNKNOWN".equalsIgnoreCase(Preference.mobileOperator)) {
     return true;
   } else {
     // System.out.println("Invalid source address:" + userId + " --> PDU
     // discarded");
     return true;
   }
 }
  // ===================================================================
  private void processRequest(PDU pdu) {
    try {
      switch (pdu.getCommandId()) {
        case Data.DELIVER_SM:
          dsm = (DeliverSM) pdu;
          if (dsm.getEsmClass() == 0x04) {
            // this.deliveryQueue.enqueue(pdu);
            Logger.info(this.getClass().getName(), "dsm.getEsmClass() == 0x04");
          } else {
            DateFormat dateFormat = new SimpleDateFormat("yyMMddHHmmssSSS");
            java.util.Date date = new java.util.Date();
            String datetime = dateFormat.format(date);

            PDUData pd = new PDUData();
            pd.setPDU(pdu);
            pd.setRequestID(Preference.prefix_requestid + datetime);

            this.requestQueue.enqueue(pd);
            // dsm.setSourceAddr(new Address("095"));
            String userid = dsm.getSourceAddr().getAddress();

            dsm.setSourceAddr(
                Preference.formatUserIdMO(userid, Constants.USERID_FORMAT_INTERNATIONAL));

            String dsmLog =
                "{MO-comes}{Request_ID="
                    + Preference.prefix_requestid
                    + datetime
                    + "}{UserID="
                    + dsm.getSourceAddr().getAddress()
                    + "}{ServiceID="
                    + dsm.getDestAddr().getAddress()
                    + "}{Info="
                    + dsm.getShortMessage()
                    + "}";
            Logger.info(this.getClass().getName(), dsmLog);
          }
          break;
        case Data.DATA_SM:
          // System.out.println(" Data_SM --> Not processed.");
          Logger.error(this.getClass().getName(), "  Data_SM --> Not processed.");
          break;
        case Data.UNBIND:
          Logger.info(this.getClass().getName(), "  Data.UNBIND --> Not processed.");
          this.requestQueue.enqueue(pdu);
          break;
        default:
          Logger.error("processRequest: Unspecified SM " + pdu.debugString());
      }
    } catch (Exception e) {

      Logger.error(this.getClass().getName(), "Exception " + e.toString());

      DBTools.ALERT(
          "PDUEventListener",
          "processRequest",
          Constants.ALERT_WARN,
          Preference.Channel + "@processRequest:" + e.toString(),
          Preference.ALERT_CONTACT);
      Logger.printStackTrace(e);
    }
  }