Busy Lamp Field (Blf) - Aastra 9143i Series Administrator's Manual

IP Phone Administrator Guide
Operational Features

Busy Lamp Field (BLF)

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.
BLF Setting (For use with Asterisk)
On 8 and 11-Line LCD phones, the busy and idle indicators show on the IP phone
screen display next to the softkey or programmable key configured for BLF
functionality. When the monitored user is idle, an icon with the handset on-hook
shows next to the BLF softkey or programmable key. When the monitored user is
on an active call, a small telephone icon is shown with the handset off-hook.
On 3-Line LCD phones, the LED lights next to each BLF programmable key
illuminate steady to indicate the monitored line is off-hook or unregistered. The
LED goes off when the line is idle.
You can configure a BLF key on the IP Phones using the configuration files or the
Aastra Web UI.
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Note: The BLF setting is applicable to the Asterisk server only.
Note: You can configure a maximum of 50 BLFs on the M670i and
M675i Expansion Modules.
41-001160-03 Rev 00, Release 2.5