code: public int getInterDigitTimer() {
          String value = Optional.fromNullable(getParameter(SignalParameters.INTER_DIGIT_TIMER.symbol())).or("30");
          return Integer.parseInt(value) * 100;
      }
docs: The amount of time allowed for the user to enter each subsequent digit.
  <p>
  Specified units of 100 milliseconds seconds. <b>Defaults to 30 (3 seconds).</b>
  </p>
  
  @return