Cisco 8821 wireless with 9800-CL

[Mario Manzano]

Hello! 

Hope all is well and thanks for reading! 

I've been pulling my hair trying to get a Cisco 8821 phone to register in Call Manager, after attaching to an SSID created in a Cisco 9800-CL controller. 

The phone works fine and registers at a different site using an old 5508 controller with a configured SSID for voice. 

The CISCO guidelines to create the voice SSID on a 9800 controller were followed, yet after succesfully joining the SSID it will just NOT register to CM. 

One thing I did notice is that latency to CM from the phone jumps from < 50ms to >300ms seemingly at random, during a ping with 25 repetitions. 

We've conluded it's the SSID, but I've ran out of ideas on where to look. 

Can anyone help, please? 

Thank you!

[cchubb]

Some additional information which someone might find helpful. 

I am moving a client off a 3504 controller onto a 9800. 

The 8821 phones are connecting to the SSID and authenticating. Also they are registering with Call Manager, but not able to make a call.  The message is "network unavailable"

I disabled WMM in the WLAN and the phones are now able to make calls. 

Hope this helps

[Leo Laohoo]

Thanks for the update.