Cisco 8861 - Mobile and Remote Access Through Expressway

Cisco IP Phone 8861 and 8865 Wireless LAN Deployment Guide
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To enable QBSS, select Enable and check Dot11e.
If Dot11e is checked, then both CCA versions (802.11e and Cisco version 2) will be enabled.
Ensure IGMP Snooping is enabled.
Ensure Wi-Fi MultiMedia (WMM) is enabled.