code: public byte[] sendQuerySmResp(OutputStream os, int sequenceNumber,
              String messageId, String finalDate, MessageState messageState,
              byte errorCode) throws PDUStringException, IOException {
          synchronized (os) {
              return pduSender.sendQuerySmResp(os, sequenceNumber, messageId,
                      finalDate, messageState, errorCode);
          }
      }
docs: /*
  (non-Javadoc)
  
  @see org.jsmpp.PDUSender#sendQuerySmResp(java.io.OutputStream, int,
  java.lang.String, java.lang.String, org.jsmpp.bean.MessageState,
  byte)