code: protected void decodeMandatoryVariableBody(ISUPParameterFactory parameterFactory, byte[] parameterBody, int parameterIndex)
              throws ParameterException {
          switch (parameterIndex) {
              case _INDEX_V_RangeAndStatus:
                  RangeAndStatus ras = parameterFactory.createRangeAndStatus();
                  ((AbstractISUPParameter) ras).decode(parameterBody);
                  this.setRangeAndStatus(ras);
                  break;
              default:
                  throw new ParameterException("Unrecognized parameter index for mandatory variable part, index: "
                          + parameterIndex);
  
          }
  
      }
docs: /*
  (non-Javadoc)
  
  @see org.restcomm.protocols.ss7.isup.ISUPMessageImpl#decodeMandatoryVariableBody(byte [], int)