Aastra Telecom 57I CT, 55I, 53I manual Busy Lamp Field BLF, BLF Setting For use with Asterisk

IP Phone Administrator Guide Operational Features

Operational IP Phone 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.

Note: The BLF setting is applicable to the Asterisk server only.

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 55i, 57i, and 57i 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 53i, 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: You can configure a maximum of 50 BLFs on the 536M and 560M

Expansion Modules.

5-114 41-001160-00, Release 2.1, Rev 04