Zulu beta is configured and works on my iPhone when it is unlocked. If the phone is locked, it never rings. I checked all the notification settings on my phone and it appears to be ok.
When I go to Admin > Zulu and click on the circle next to my user, I get the following error
Undefined index: status
File:/var/www/html/admin/modules/zulu/Zulu.class.php:109