code: public char getReinputKey() {
          String value = Optional.fromNullable(getParameter(SignalParameters.REINPUT_KEY.symbol())).or("");
          return value.isEmpty() ? ' ' : value.charAt(0);
      }
docs: Defines a key sequence consisting of a command key optionally followed by zero or more keys. This key sequence has the
  following action: discard any digits collected or recordings in progress and resume digit collection or recording.
  <p>
  <b>No default.</b>
  </p>
  An application that defines more than one command key sequence, will typically use the same command key for all command
  key sequences.
  </p>
  <p>
  If more than one command key sequence is defined, then all key sequences must consist of a command key plus at least one
  other key.
  </p>
  
  @return