/**
  * @see EPSInterface::getStateById()
  */
 public function getStateById($sessionId, $stateId)
 {
     try {
         $getStateByIdStdObject = new stdClass();
         $getStateByIdStdObject->sessionId = $sessionId;
         $getStateByIdStdObject->stateId = $stateId;
         $response = parent::getStateById($getStateByIdStdObject);
         if (isset($response->return)) {
             $resultState = new ResultState($response->return);
         } else {
             $resultState = null;
         }
         return $resultState;
     } catch (SoapFault $sf) {
         throw new ServerException($sf);
     }
 }