protected function createReceiveVoiceMsg(array $data)
    {
        $result = new WxReceiveVoiceMsg();
        $this->initReceiveMsg($result, $data);
        $result->setMediaId(isset($data['MediaId']) ? trim($data['MediaId']) : '');
        $result->setFormat(isset($data['Format']) ? trim($data['Format']) : '');
        return $result;
    }