Cisco 8821 Manual page 64

If Call Admission Control for voice is enabled, then the following configuration should be active, which can be displayed in the
show run-config.
Call Admission Control (CAC) configuration
Voice AC - Admission control (ACM)............
Voice max RF bandwidth........................
Voice reserved roaming bandwidth..............
Voice load-based CAC mode.....................
Voice tspec inactivity timeout................ Disabled
Video AC - Admission control (ACM)............
Voice Stream-Size.............................
Voice Max-Streams............................. 2
Video max RF bandwidth........................ 25
Video reserved roaming bandwidth.............. 6
The voice stream-size and voice max-streams values can be adjusted as necessary by using the following command.
(Cisco Controller) >config 802.11a cac voice stream-size 84000 max-streams 2
Ensure QoS is setup correctly under the configuration, which can be displayed by using the following command.
(Cisco Controller) >show wlan <WLAN id>
Quality of Service............................... Platinum (voice)
WMM.............................................. Allowed
Cisco Wireless IP Phone 8821 and 8821-EX Wireless LAN Deployment Guide
Enabled
75
6
Enabled
Disabled
84000
64