Busy Lamp Field (BLF)

Introduction:

BLF is an acronym for Busy Lamp Field, which is a light on an IP Phone that tells you whether another extension connected to the same PBX is busy or not.

This feature allows a Monitor Account/Extension to see the status of other extensions. By activating this function, the user will be able to:

• Check if another extension is currently on a call;
• See if there’s an incoming call to other extensions, and;
• If unanswered, theUser will be able to pick up the call of another extension.

Configuration:

Legend:

• Phone System Extension - IP License - sipAAAA = Main Account (Main Extension)
  • This account can see the status and monitor other accounts.
• Phone System Extension - IP License - sipBBBB = Monitored Account (Monitored Extension)
  • This account's status is monitored.

Configuration steps:

1. Set up the IP License - SIP accounts for both Main and Monitored accounts.
2. Set up BLF Group.
3. Set up IP Phone Function Keys.

Step 1:

1. In order to configure it, the Admins must assign IP Phone licenses for appropriate users.
   • Click here for instructions.
2. Once the users have IP Licenses, it can be configured either via Manual or Auto-provisioning process.
   • Click here for instructions.

Step 2:

In order to create BLF Group, please follow the steps below:

1. Go to Phone System, choose View - System
2. Select Busy Lamp Field tab
3. Click Create button
4. Choose:
   • Group Key (= Main Extension)
   • Monitored Extension(s)
5. Finish
6. Otherwise, you can Edit or Delete the BLF Group

### Step 3:

FANVIL IP Phone

1. Log in to the Device Portal
2. Go to the Function Key Tab
3. Randomly select DSS Key (e.g. DSS Key 2) and configure as below:
   • Type = Memory Key
   • Name = (Name that you want to appear on the IP Phone keys)
   • Value = Monitored Account (sipBBBB)
   • Subtype = BLF/NEW CALL
   • Line = Line of Main Account (sipAAAA)
   • Pickup Number
     • For Grouped Extensions = *8
     • For Non-Grouped Extensions = Pickup Code + Ext number of Monitored Account = *8101

   

YEALINK IP Phone

1. Log in to the Device Portal
2. Go to the DSSKey Tab
3. Randomly select DSS Key (e.g. DSS Key 2) and configure as below:
   • Type = BLF
   • Value = Monitored Account (sipBBBB)
   • Label= (Name that you want to appear on the IP Phone keys)
   • Line = Line of Main Account (sipAAAA/Line 1)
   • Extension
     • For Grouped Extensions = *8
     • For Non-Grouped Extensions = Pickup Code + Ext number of Monitored Account = *8101
4. Go toSettings Tab
5. Select Dial Plan
6. Replace the dialing of sipBBBB (Monitored Account) with extension values.

• From Step 1 to Step 3:

• From Step 4 to Step 6:

   

Result:

When configuration steps are completed:

• Main Extension can see the Monitored Accounts on their IP Phone.
• When a call comes into Monitored Extensions, the indicator light of the Main Extension will start blinking.
• If Monitored Extensions cannot answer calls, the Main account can pick up the call simply by pressing on the blinking key.

Please Note

• The total limit for Users in BLF Group are 20 users.
• System will auto count when users enter the numbers.
• When the limit is reached, you cannot add more user to the list.