Cisco 8861 Deployment Manual page 63

On the 802.11 tab, configure the data rates as desired.
Is recommended to enable 12 Mbps as Mandatory and 18 Mbps and higher as Supported; however some environments may
require 6 Mbps to be enabled as a mandatory (basic) rate.
On the RRM tab, the Maximum Power Level Assignment and Minimum Power Level Assignment settings as well as other
DCA, TPC, and Coverage Hole Detection settings can be configured.
Cisco IP Phone 8861 and 8865 Wireless LAN Deployment Guide
63