Busy Lamp Field (BLF) feature

Updated 2 months ago by Hallie

BLF is an acronym for Busy Lamp Field, which is a light on an IP Phone or a colored indicator next to a name in a softphone or web client, 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, User will be able to pick up the call of another extension

Configuration

  • Legend
    • sipAAAA = Main Account (Main Extension) : the account that can see status of other accounts.
    • sipBBBB = Monitored Account (Mornitored Extension) : the account whose status is monitored.
  • Set up the SIP accounts, either via manual or auto-provisioning. Both main and monitored account should be configured in advance.
  • Set up BLF Group (see below)
  • Set up IP Phone Function Keys (see below)

Set up BLF Group

Go to Bizphone app > Extensions > BLF > Create Group > Select Main Extension > Select Monitored Extension(s) > Finish (Screenshots below - click image to see full size)

  1. Create BLF Group
  1. Choose main extension that can see status of other extensions
  1. Choose monitored extension(s) whose status is monitored.

Set up FANVIL IP phone function keys

  • Log in to the Device Portal
  • Go to the Function Key Tab
  • Randomly select DSS Key (e.g. DSS Key 2) and configure as below:
    • Type = Memory Key
    • Name = (Whatever 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

Sample configuration for reference

  • Log in to the Device Portal
  • Go to the DSSKey Tab
  • Randomly select DSS Key (e.g. DSS Key 2) and configure as below:
    • Type = BLF
    • Value = Monitored Account (sipBBBB)
    • Label = (Whatever 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
  • Go to GUI Settings > Dial Plan > Replace the dialing of sipBBBB (monitored account) with extension values.

Result

Once everything is set up, User should be able to see the monitored extensions on their IP phone:

  • When a call comes in to the monitored extension, the indicator light will start blinking.
  • Once the call is answered, the indicator light will turn red until done.
  • If not answered, user can pick up the call simply by pressing on the blinking key.


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