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62 Model 6753i IP Phone User Guide
Line Keys and Programmable Keys
Busy Lamp Field (BLF) Key
The BLF feature on the IP phones allows a specific extension to be monitored for state changes.
BLF monitors the status (busy or idle) of extensions on the IP phone.
Example
A Supervisor configures BLFs on his phone for monitoring the status of a worker’s phone use
(busy or idle). When the worker picks up his phone to make a call, a busy indicator on the
Supervisor’s phone shows that the worker’s phone is in use and busy.
On the 6753i, the busy and idle indicators are the LEDs next to each BLF key. The LED
illuminates steady to indicate the monitored line is off-hook or unregistered. The LED goes off
when the line is idle.
You can set BLF on the programmable keys or expansion module keys using the Aastra Web UI
only. BLF is not configurable from the IP phone UI.
Note: The BLF setting is applicable to the Asterisk server only.
Note: You can also use a BLF configured key to dial out. Contact your System
Administrator for more information