public function parseVoice($voiceObject)
 {
     $voice = new Voice();
     $voice->setFileId($voiceObject->file_id);
     $voice->setDuration($voiceObject->duration);
     if (property_exists($voiceObject, 'mime_type')) {
         $voice->setMimeType($voiceObject->mime_type);
     }
     if (property_exists($voiceObject, 'file_size')) {
         $voice->setFileSize($voiceObject->file_size);
     }
     return $voice;
 }