Cisco 9971 Deployment Manual page 45

The WMM policy can be set to "Required" if only the Cisco Unified IP Phone 9971 or other WMM enabled phones will be
using this SSID.
If 7920 or other non-WMM clients will associate using this SSID, then ensure the WMM policy is set to "Allowed".
Enable "7920 AP CAC" to advertise Qos Basic Service Set (QBSS) to the client.
Configure session timeout as necessary. It is recommended to extend the timeout to avoid possible interruptions during re-
authentication.
Enable Aironet Extensions (Aironet IE).
Disable client exclusion for the voice network.
DHCP Address Assignment should be disabled.
MFP client protection should be disabled or only set to optional.
For optimal battery performance and quality, use DTIM of 2 with a beacon period of 100ms.
Ensure Client Load Balancing and Client Band Select are disabled for the voce SSID.
For the autonomous access point, ensure that the SSID is configured for open + eap as and network-eap when using 802.1x
authentication.
Cisco Unified IP Phone 9971 Wireless LAN Deployment Guide 45