Maybe they are referring to the Enable Device Configuration COS.
For 69xx IP phones, enter 0 to disable Language, Voicemail, Call Forward, Config Teleworker, WiFi, Bluetooth, and Reset settings in the Settings menu. This also disables the long key press functionality. Or, enter the length of time (range 1 to 5 seconds) for which a programmable key (PK) must be held down to launch the key programming application.