I would like to prevent devices from downloading iOS 7 while using networks we control. We have MDM capability and firewalls, but I'm not sure what the the minimal ports and destinations that should be entered into a firewall to prevent downloading iOS 7 over the air via WiFi network.
What can be done to prevent iOS 7 downloads to save bandwidth and save storage space on our devices?
Bonus points for describing any issues / other things that this block might affect such as App Store updates or downloads. Extra bonus points if this could be accomplished by a profile or other means than network control. I'm more focused on not having devices download the update than how that happens.