you should be able to “head” any commercial php file and see the zend/ioncube header
[[email protected] ~]# head /var/www/html/admin/modules/restapps/functions.inc/aastra.class.php
<?php //00671
// 0 @Ioncube;
//
// Phone Apps 16.0.21
// Copyright 2022 by Sangoma Technologies Inc., All rights reserved
//
// By installing, copying, downloading, distributing, inspecting or using
// the materials provided herewith, you agree to all of the terms of use as
// outlined in our End User Agreement which can be found and reviewed at
// https://www.freepbx.org/legal/