I currently have an issue with a 7921G phone which authenticates with the access point ok but is showing DHCP timout on the phone itself
Our setup is as follows a Cisco 4400 Wireless Lan controller, a 4510 chassis based switch which supplys dhcp range for IP telephony and this is setup on the lan controller as dhcp relay
There is a binding shown on the switch for mac to ip adress but somehow this is not filtering through to the phone
The phone also shows on the client detail on the nearest access point but i have noticed that policy manager state is showing Dhcp_reqd
I would appreciate help with this very much
Do you have DHCP required unabled under the WLAN? You shouldn't have it enabled on the WLANs being used by the 7921's. The phone doesn't re-DHCP with every layer-2 change so the phone can get stuck in DHCP_Req after a roam.