IPad and iPhone Intermittent WiFi with Cisco

I have around 35 iPhones and iPads that are at best intermittent with our internal wireless network. I have been working with Cisco for two days and they are unable to resolve the issue. The WiFi works perfectly with our notebooks so it is definetly narrowed down to the Apple hardware needing a special configuration other than the ones we have tried.
I am currently using a Cisco WLC2106 controller with 1142N access points. The dhcp is working. I can forget the network or turn off the WiFi and back on and get an assigned address. At first it took several minutes to populate but Cisco helped me resolve that first problem. The iPhones and iPads will get the private IP but will not allow it to go out on the Internet. I get a good association (WiFi indicator in top-left is full strength.) At times one iPad will connect and another will stop working. For example: yesterday I had my iPad, laptop, and iPhone while I was working with Cisco. All three were connected to the WiFi network with seperate IP's. The laptop never stopped working. My iPhone worked for a few minutes and then I left the office with my phone for about 20 miinutes. When I returned the iPad worked but my iPhone did not, even after making sure the iPhone reconnected and gave it more than 10 minutes and a reboot. I have configured 1 iPad1, 2 iPad2's, and four iPhone 4's. They are all intermittent and I have yet to figure out any formula for why one might work while the others stop. I have done resets on them, statically assigned ip's, and changed DNS settings. Again, the laptop never missed a beat while the iPads just come and go. The way I have been testing is through using a website in Safari on the iPad or iPhone to check the external IP to make sure it is our ISP and not using ATT 3G. I also check the App Store which also fails on WiFi. The WiFi works fine at home with my linksys router. I have tried changing the WiFi encryption from WPA2 to WEP and even disabled the security for testing. Even with no encryption the same result prevails. Maybe one out of five tries to connect works and it alternates between devices. If I didn't know any better I would think it was an IP conflict or a maximum connection limit somewhere.
Here is the general config:
Cisco based wireless using no encryption. I will eventaully need to go WPA2 but for troubleshooting I have tried it as open. I am not broadcasting SSID. I CAN connect to WiFi network and receive IP, Gateway, DNS, and Domain Name consistently. I CANNOT access the Internet consistently. This is a business network with Cisco Catalyst Switches, Routers, and Firewalls. Again, the laptops that connect using WiFi are working as intended,
Does Apple have publicly accessible engineers for these situations? I have left the case open with Cisco in order to provide as much information as possible to Apple.
Thanks for any suggestions.

Internally I am not blocking any traffic. I have over 100 other Windows devices, cameras and printers on this single subnet. I'm not using any other Apple hardware at this time so I'm not sure what the Bonjour will do for me that TCP/IP can't do. I am also not using Bonjour at either of the homes I have done other testing on.
One more tidbit. One of our goals is to use FaceTime between the iPads. I have successfully connected a few times between the devices but it's almost every time I connect two iPads to FaceTime they will not connect again. Without changing anything else on the WiFi or the Firewall I can come back the next day, reset the iPads, obtain Internet access and the FaceTime will work. Thanks gyrhead!

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