CURL с авторизацией PHP POST

$params=['RoomId'=>'666'];

$ch = curl_init("http://191.168.111.9/hs/mihkz/getdoctor/");
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/xml', $additionalHeaders));
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_USERPWD, "Админ" . ":" . "dwedewdwedwe");
curl_setopt($ch, CURLOPT_TIMEOUT, 30);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
$return = curl_exec($ch);
echo "<pre>";
print_r($return);
echo "</pre>";
curl_close($ch);