You can use BLF to monitor a specific line for status changes on the phone. For example,
you can configure a BLF key on the phone for monitoring the status of a friend’s line
(busy or idle). The BLF key illuminates solid red when the friend’s line is in use.

You can tap a BLF key to dial out the monitored phone number when the monitored line
is idle. You can receive a visual and an audio alert (if enabled), and also pick up the call
when the monitored line receives an incoming call. For more information, contact your
system administrator.

To configure a BLF key via phone user interface:

1. Tap the DSS Key key.

2. Tap the desired line key.

3. Tap the gray box of the Type field.

4. Tap BLF from the pull-down list.

5. Tap the gray box of the Account ID field.

6. Tap the desired line from the pull-down list.

7. (Optional.) Enter the string that will appear on the touch screen in the Label field.

8. Enter the phone number or extension you want to monitor in the Value field.