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Operational Features
5-26 41-001129-00 Rev 09, Release 1.4.1
IP Phone Administrator Guide
Operational Features
Busy Lamp Field (BLF) (480i/480i CT/9133i only)
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 480i and 480i CT, the busy and idle indicators show on the IP phone screen
display next to the softkey programmed for BLF functionality. When the
monitored user is idle, an icon with the handset on-hook shows next to the BLF
softkey. When the monitored user is on an active call, a small telephone icon is
shown with the handset off-hook.
On the 9133i, 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.
Note: The BLF setting is applicable to the Asterisk server only.