and you can choose to lock the function keys or all keys. And this function can only be
configured through the web UI, please refer to the web interface for the details.
Function Keys: The function keys are locked. You cannot use the LIINE KEYS, MESSAGE
KEY, SOFT KEYS, NAVIGATION KEYS, FUNCTION KEYS until unlocked.
All Keys: All keys are locked.
3.20.Busy Lamp Field (BLF)
Busy Lamp Field (BLF) is used to monitor a specific user for status changes on IP phones. For
example, you can configure a BLF key on a supervisor’s phone to monitor the phone user
status (busy or idle). When the monitored user places a call, a busy indicator on the
supervisor’s phone indicates that the user’s phone is in use.
BLF LED Mode
BLF LED Mode provides two kinds of definition for the BLF key LED status.
Line key LED