public function can_mix_monitor()
{
$write = array(implode("\r\n", array('action: MixMonitor', 'actionid: 1432.123', 'channel: channel', 'file: file', 'options: options', '')));
$action = new \PAMI\Message\Action\MixMonitorAction('channel');
$action->setFile('file');
$action->setOptions(array('o', 'p', 't', 'i', 'o', 'n', 's'));
$client = $this->_start($write, $action);
}