Cisco 8865 - Add a Third Party to a Conference; Join Calls Into a Conference; Swap Between Calls Before Completing a Conference

Cisco IP Phone 8861 and 8865 Wireless LAN Deployment Guide
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WLAN Settings
It is recommended to have a separate SSID for the Cisco IP Phone 8861 and 8865.
However, if there is an existing SSID configured to support voice capable Cisco Wireless LAN endpoints already, then that
WLAN can be utilized instead.
The SSID to be used by the Cisco IP Phone 8861 and 8865 can be configured to only apply to a certain 802.11 radio type (e.g.
802.11a only).
Enable WPA2 key management.
Ensure either 11r or CCKM is enabled, where 11r is recommended.