Подключение MSS_QL

try {
    $hostname = "zzz.zzz.zzz.zzz";
    $port = 1443;
    $dbname = "CRM_test";
    $username = "test";
    $pw = "123456";
    $dbh = new PDO ("dblib:host=$hostname:$port;dbname=$dbname","$username","$pw");
} catch (PDOException $e) {
    echo "Failed to get DB handle: " . $e->getMessage() . "\n";
    exit;
}