Cisco 2100 Series Configuration Manual page 41

Spectralink VIEW Certified Configuration Guide: Cisco Controllers and APs
(Ensure that the Multicast Vlan Feature remains unchecked for proper PTT performance.)
8 Under the QoS tab, set Quality of Service to Platinum. This is the required setting for
voice traffic.
9 Set WMM Policy to Required (scroll down to setting as needed).
Versions before 7.4
721-1001-000-AH.docx
December 2016 41