BLF groups

Busy Lamp Field — key assignment for monitoring other extensions: a phone's programmable keys light up to show whether another extension is free, ringing or busy, and dial it with one press. Configured under PBX > BLF Groups.

Two device roles, easy to mix up

A BLF group connects two different lists of devices:

List	What it means
Subscribing devices	Devices whose keys display the BLF status of this group — the phone that shows the lights.
Assigned devices	The watched extensions of this group (device + extension) — what those lights actually monitor.

A single device can appear in both lists at once — it watches its own colleagues' extensions on its own keys.

Create a group

Fill in Name and an optional Comment on the right and click Create.

BLF Groups page: a list with one group, Demo BLF, comment 'Watches the two demo devices', 0 subscriptions, 0 devices, and Manage/Edit/Delete actions; a New group form on the right with Name and Comment fields. — "Demo BLF" just created — no devices in it yet.

Add subscribing and watched devices

Click Manage on a group to open it. Add a Subscribing device from the dropdown and click Subscribe; add a watched device under Assign Device with its Device and the Extension it should monitor, then click Assign.

Warning

Both the Assign Device form's fields are required — leaving the device unpicked or the extension blank rejects the row with "device must be selected" / "Extension cannot be blank" rather than saving something half-filled.

Check

Open the group and confirm the device you expect to see the lights is listed under Subscribing devices, and every extension it should watch is listed under Assigned devices with the right Device and Extension.