code: protected void decodeMandatoryVariableBody(ISUPParameterFactory parameterFactory, byte[] parameterBody, int parameterIndex)
              throws ParameterException {
          throw new ParameterException("This message has no mandatory parameters, unknown parameter index: " + parameterIndex
                  + ", body: " + ISUPUtility.toHex(parameterBody));
  
      }
docs: /*
  (non-Javadoc)
  
  @see org.mobicents.isup.messages.ISUPMessage#decodeMandatoryVariableBody(byte [], int)