Cisco 7925G Deployment Manual page 63

If the Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G are running firmware version 1.3(3) or earlier, then
enable WPA policy with TKIP encryption and 802.1x + CCKM for authenticated key management type in order to enable fast
secure roaming.
The WMM policy should be set to Required only if the Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G or
other WMM enabled phones will be using this SSID.
If there are non-WMM clients existing in the WLAN, it is recommended to put those clients on another SSID / WLAN.
If non-other WMM clients must utilize the same SSID as the Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G,
then ensure the WMM policy is set to Allowed.
Enable 7920 AP CAC to advertise Qos Basic Service Set (QBSS) to the client.
Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Deployment Guide
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