public function archive($userId, $callId)
    {

        /** @var StateStorage $stateStorage */
        $stateStorage = $this->getServiceManager()->get(StateStorage::SERVICE_ID);

        $state = $stateStorage->get($userId, $callId);

        return (!is_null($state)) ? $this->getFileSystem()->write($this->generateSerial($userId, $callId), $state) : false;
    }