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5.4. BLF
Busy Lamp Field (BLF) is used to monitor a specific user for status
changes on IP phones. For example, users 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.
Enter the dial interface, click BLF button.