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

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 the 9480i, 9480i CT, 6755i, 6757i, and 6757i CT, 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 the 9143i, 6751i, and 6753i, 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.
41-001160-03, Rev 00, Releaes 2.4
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.
Configuring Operational Features
Operational Features
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