Configuring Qos Basic Service Set (Qbss) - Cisco 7925G Deployment Manual

Dot11-Phone Mode (7920).......................... ap-cac-limit
Wired Protocol................................... 802.1P (Tag=6)
When enabling Call Admission Control on the autonomous access point, the admission must be unblocked on the SSID as well.
It is recommended to enable Call Admission Control on the SSID configuration, regardless of Admission Control being enabled
for Voice or Video.
dot11 ssid voice
vlan 21
authentication open eap eap_methods
authentication network-eap eap_methods
authentication key-management wpa cckm
admit-traffic
Also ensure that the PHY rate configured on the Cisco Unified Wireless IP Phone 7925G is enabled as a nominal rate in the
STREAM configuration of the autonomous access point.
Recommend to use the defaults, where 5.5, 6.0, 11.0, 12.0 and 24.0 Mbps are enabled as nominal rates for 802.11b/g and 6.0,
12.0 and 24.0 Mbps enabled for 802.11a.
If enabling the STREAM feature either directly or via selecting "Optimized Voice" for the radio access category in the QoS
configuration section, ensure that only voice packets (RTP) are being put into the voice queue. Signaling packets (SCCP)
should be put into a separate queue. This can be ensured by setting up a QoS policy mapping the DSCP to the correct queue.
For more information about Call Admission Control and QoS, refer to the "Configuring QoS" chapter in the Cisco IOS
Software Configuration Guide for Cisco Aironet Access Points at this URL:
http://www.cisco.com/en/US/docs/wireless/access_point/12.3_8_JA/configuration/guide/s38qos.html

Configuring QoS Basic Service Set (QBSS)

There are three different versions of QoS Basic Service Set (QBSS) that the Cisco Unified Wireless IP Phone 7925G supports.
The first version from Cisco was on a 0-100 scale and was not based on clear channel assessment (CCA), so it does not account
for channel utilization, but only the 802.11 traffic traversing that individual access point's radio. So it does not account for
other 802.11 energy or interferers using the same frequencies. The max threshold is defined on the client side, which is set to
45. This would allow for up to 7 calls at 11 Mbps plus some background traffic.
QBSS is also a part of 802.11e, which is on a 0-255 scale and is CCA based. So this gives a true representation on how busy
the channel is. The max threshold is also defined on the client side, which is set to 105.
The second version from Cisco is based on the 802.11e version, but allows the default max threshold of 105 to be optionally
configured.
Each version of QBSS can be optionally be configured on the access point.
For the Cisco Unified Wireless LAN Controller, enabling WMM will enable the 802.11e version of QBSS. There are also the
"7920 Client CAC" and "7920 AP CAC" options, where "7920 Client CAC" will enable Cisco version 1 and "7920 AP
CAC" enables Cisco version 2. See the
For the Cisco Autonomous Access Point, "dot11 phone" or "dot11 phone dot11e" will enable QBSS.
Cisco Unified Wireless IP Phone 7925G Deployment Guide
"SSID / WLAN QoS Settings" section for more info.
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