helper.php

<?php
namespace Bitrix\Im;
 
class Helper
{
    public static function getOnlineIntranetUsers()
    {
        $users = \Bitrix\Main\UserTable::getList([
            'select' => ['ID'],
            'filter' => [
                '=IS_REAL_USER' => 'Y',
                '=IS_ONLINE' => 'Y',
                '!=UF_DEPARTMENT' => false
            ]
        ])->fetchAll();
 
        return array_map(function($item) { return $item['ID']; }, $users);
    }
}