Introduction
Preface
This document describes the BLF List function of SIP phones and how to use it by configuring BroadWorks and the phone.
All phone models including BX3S, BX4, BX5S, BX6, BX7, BX7C, GP210, GP210i, BXU series, BC600, BD900 support this function with the same configuration method.
Introduction to BLF List Function
BLF (Busy Lamp Field) obtains the call status of an extension by subscribing to it.
When you configure a BLF number on a DSSkey, the LED indicator changes when the monitored extension status changes. One BLF key monitors only one extension.
BLF List allows monitoring multiple extensions at once.
The user configures a list of monitored numbers on the PBX server, and the phone automatically maps them to DSSkeys.
The LED indicators update when any monitored extension changes status.
BLF List is a group subscription function for batch monitoring.
The BLF List function requires cooperation between the SIP phone and PBX server.
Verified compatible PBX: BroadSoft BroadWorks, Fortinet FortiVoice, VoipSwitch.
Other PBXs supporting BLF List may also work.
This guide uses BroadWorks as an example.
Configure BLF List Service on BroadWorks
1. Log in to the BroadWorks web configuration interface.
2. Click Users to enter the BroadSoft account selection page.
3. If accounts exist, click Search to show the list. Select an account (e.g., FanvilUser1) and go to Step 5.
If no account exists, click Add to create a new one (Step 4).
4. Create a new BroadWorks account.
5. Enter the configuration page of the selected account (FanvilUser1).
6. Click Client Applications.
7. Click Busy Lamp Field to open the BLF List configuration page.
8. Enter a List URI (e.g., blf1). This value must match the BLF List Number on the phone.
Click Search to show available extensions.
Move desired extensions to the monitored list, then click OK to save.
9. Log in to the phone Web UI (default username/password: admin).
10. Go to Shortcuts in the left menu.
Set DSSKey Type to BLF List. Each key maps to one monitored number.
If the list has more extensions than BLF List keys, the phone assigns them to DSSkeys with Type None.
Click Apply to save.
11. Go to Line in the left menu.
Configure the BroadWorks account (FanvilUser1) to the corresponding phone line.
12. Go to Advanced Settings → SIP Advanced Settings.Enable BLF List and enter the BLF List Number (same as List URI in Step 8).
Click Submit.
Ensure the FanvilUser1 account registers successfully. BLF List is now configured.
13. Check the DSSkey LEDs on the phone.
Solid LED means successful configuration.
Make a call to the monitored extension — the corresponding LED will change status.