Cisco wireless SIP phone 8821 not getting connected to the network

[Risat]

Hi,

I am adding a new Cisco wireless 8821 SIP phone to our CUCM, but its not even getting IP, I tried to put manual IP but still its not connected to the network. However our Cisco SCCP wireless phones connects to the network and registers properly. Anybody can shed some light on this please.

[pbarcia]

Firmware: 

sip8821.11-0-4SR2-15

Finally, the problem was "tkip". It seems like this phones do not support TKIP encryption. So, I create a new ssid with WPA2 with AES and with this configuration I have no problem (later I follow the cisco deployment guide for this phone). I don´t remember, but I think that in deployment guide there is no mention of unssuported wlan configs.