code: public boolean getIncludeEndInputKey() {
          String value = Optional.fromNullable(getParameter(SignalParameters.INCLUDE_END_INPUT_KEY.symbol())).or("false");
          return Boolean.parseBoolean(value);
      }
docs: By default the End Input Key is not included in the collected digits returned to the call agent. If this parameter is set
  to "true" then the End Input Key will be returned with the collected digits returned to the call agent.
  <p>
  <b>Default is "false".</b>
  </p>
  
  @return