Cisco Aironet 1252 and IPHONE Wireless Not Working

I deployed a few Cisco 1252 AP's and ran into an issue getting the IPHONE to connect to them over the wireless network. It would not connect using WPA-PSK TKIP or even just plain open authentication. Cisco TAC was unable to come up with a solution. So I procceded to systematically change options on the radio one by one. I was able to get the iphone connected after disabling the Cisco Aironet Extensions on the radio interface. I haven't had issues in the past with 1242 AP's and iphones, but with the 1252 there does seem to be a problem. My AP's were also deployed autonomously.

I found this wiki article about Aironet Extensions which I have never used:

http://supportwiki.cisco.com/ViewWiki/index.php/Is_it_possible_to_use_Aironet_extentions_in_a_mixed_environment_with_Cisco_and_non-Cisco_clients%3F

I'm not sure if this is a new thing that these are on by default now.