Hi
The AP’s until the 203R, 303, 303H, 318, 345 are all in two models : (C)AP and IAP.
An AP can never become a IAP, due to regulatory domains. The AP follows the regulatory domain of the controller. As an IAP is bought with region code (US, IL, RW) is can be used without controller
The newest AP’s mentioned above are unified AP’s, are bought for a region and can run both.
http://community.arubanetworks.com/t5/Technology-Blog/Aruba-Unified-AP-platform/ba-p/295661Hope this helps