Skip to content
  • Academy KB Home Redesign
  • Broadband Home
  • CCaaS
  • Channel Partner Support
  • Circle Loop Home
  • Collaborate
  • Connectivity
  • Courses
  • Documentation
  • Ethernet
  • FibreXchange
  • FUSION IoT
  • Gamma AI Concierge
  • Gamma Plus
  • Gamma SIP for Cloud Connect
  • Gamma SIP Global Communications Enablement
  • Gamma SIP Trunks for Genesys Cloud
  • Hannah – Homepage WIP
  • Home
  • Horizon
  • Horizon Contact
  • Horizon Forms
  • Horizon Service Description Home
  • Horizon with Webex
  • Inbound
  • iPECS
  • Knowledge Base Intro
  • Knowledgebase Directory
  • LoginPress
  • Microsoft
  • Microsoft Teams Direct Routing Home
  • Microsoft Teams Operator Connect
  • Mobile
  • Multiple KB
  • My Courses
  • No Access
  • No active page
  • Numbering and Porting
  • Phoneline+
  • Product Homepage
  • Quick Download Button
  • Release Notes
  • Release Notes
  • SIP Home
  • Test
  • UCaaS
  • User Account
  • Voice
  • Voice Enablement
  • Webex for Gamma
  • Webex for Gamma Release Notes
  • Gamma Academy Knowledge Base
Gamma Academy Knowledge Base
  • Cloud Calling and Collaboration
    • Webex for Gamma
    • Horizon with Webex
    • Horizon
    • Phoneline+
    • Operator Connect
    • Direct Routing
    • Inbound
    • Akixi CX Analytics
    • Red Cactus
  • Connectivity and Networking
    • Numbering and Porting
    • Broadband
    • FibreXchange
    • Ethernet
    • SIP Trunking
    • Gamma FUSION IoT
  • CX
    • Horizon Contact
    • AI Concierge
  • Mobile Services
    • Gamma Mobile
  • CyberSecurity
    • SafeWeb
  • Partner & Portal Support
Gamma Academy Knowledge Base

Provisioning and In-Life Changes

  • Before Ordering Horizon
    • Example Checklist of a Horizon Installation
    • Horizon Site Survey
    • Customer Site and Horizon Service
    • Horizon Number Requirements
    • Horizon Network Configuration Guidelines
    • Horizon After Care
    • Horizon Glossary
  • Ordering Horizon on the Gamma Portal
    • Ordering a Horizon Company
  • Configuring Your Horizon Company
    • Horizon Sites
    • Add Horizon Users
  • In-Life Ordering
    • Horizon Change Branding
    • Horizon Bolt-Ons
    • Horizon: Managing Subscriptions
    • Horizon Numbers & Porting
  • In-Life Configuration
    • Multi factor Authentication (MFA)
    • Horizon: Configuring the New Solution
    • Horizon Fraud Management
    • Cease a Horizon Company

Features

  • Device Management
    • Device Customisation
    • Yealink DECT – Multiple Users Assigned to a Single Base Station
  • Outgoing Call Settings
    • Click to Dial
    • Call Barge
  • Call Groups
    • Nuisance Call Management for Horizon Call Groups
    • Instant Conference Group
    • Hunt Groups
    • Call Queue Groups
    • Call Pickup
    • Call Park
    • Call Paging
    • Auto Attendant
  • Voicemail
    • Voice Portal
    • Voicemail
    • Horizon Voicemail Map
  • Scheduling
    • Schedules
    • Create a Call Group Schedule
    • Configuring Additional Routing for Christmas Schedules
    • Configuring Schedules for Auto Attendants using a Hunt Group
  • User Call Setup
    • Availability Profiles
    • Busy Lamp Field (BLF)
    • Comfort Messages
    • CLI Presentation
    • Distinctive Ringing for External Calls
    • Do Not Disturb
    • Hot Desking
    • Remote Office
    • Sequential Ringing
    • Twinning
    • 1 or 2 Digit Dialling (Speed Dials)
  • Company Admin
    • Site-to-Site Presentation Policy
    • Music on Hold
    • Horizon Shortcodes
    • Directory
    • Departments
    • Account and Authorisation Codes
  • Incoming Call Settings
    • Call Waiting
    • Call Transfer
    • Call Recording
    • Call Forwarding
    • Call Barring
    • Automatic Call Back
    • Anonymous Call Rejection

Advanced Feature Guides

  • Call Recording
    • Call Recording Service
    • Call Recording – Portal User Guide
    • Call Recording – MFA How to Guide
    • Call Recording – MFA Technical Support
    • Call Recording – Known Behaviours
    • Call Recording – FAQs
  • Integrator
    • Horizon Integrator TAPI User Guide
    • Horizon Integrator Controlled Integrations
    • Horizon Integrator Standard Select Integrations
    • Horizon Integrator Client SDK Engagement Process
    • Horizon Salesforce (Lightning) Adaptor Add-in Guide
  • Call Center Guides
    • Horizon Call Centre Administrators Guide
    • Horizon Internet Explorer Settings for Full Screen Mode
  • Multi-Factor Authentication (MFA)
    • How-To Guide: Horizon Multi-Factor Authentication
    • Multi-Factor Authentication (MFA) FAQs
    • Technical Support Guide: Multi-Factor Authentication
  • Soft Phone Guides
    • Horizon Soft Phone Guide – iOS
    • Horizon Android Soft Phone Guide
    • Horizon Soft Phone Client PC Guide
    • Horizon Setup Soft Phone Client for a user Guide
  • Akixi
    • Akixi Documentation

Technical Support

  • Diagnosing and Raising a Fault
    • Horizon Health Check
    • I Have a Problem With Call Connection/Calls are Dropping
    • I Have a Problem With Call Quality
    • I Have a Problem With a Feature
    • I Have a Problem With the Horizon Portal
    • New Call Recording Technical Support
    • Raise a Fault
  • Handset Support
    • Poly Profile Rules and Recovery
    • Cisco Profile Rules and Recovery Process
    • Yealink Profile Rules and Recovery Process
    • Handset Returns
    • Horizon RMA Check List
  • Handset User Guides
    • Poly Handset User Guides
    • Cisco Handset User Guides
    • Yealink Handset User Guides
    • Sennheiser Handset User Guides
  • Known Behaviours
    • Horizon Known Behaviours
    • Horizon SIP ALG

Service Description

Horizon Release Notes

T&Cs and SLAs

Horizon Forms

Provisioning and In-Life Changes

  • Ordering Horizon with Webex on the Gamma Portal

Features

Technical Support

User Knowledge Base

Service Description

Horizon with Webex Release Notes

Horizon with Webex Forms

T&Cs and SLAs

  • Home
  • Home
  • Features
  • User Call Setup
  • Busy Lamp Field (BLF)
View Categories

Busy Lamp Field (BLF)

A Busy Lamp Field (BLF) gives you the ability to monitor a fellow colleague’s line to see if they are available to take a call that you may transfer to them or to enable you to pick up their calls.

When implemented the phone will show the user’s caller ID on the pre-defined line keys on your device. This line key can also be used as a speed dial to contact your colleague’s number quickly when transferring a call or when needing to speak to them directly.

Please note: We allow a maximum of 50 Busy Lamps to be configured if a sidecar is present. The remaining line keys can then be used for other available entries

Devices

Line Keys Available with no Sidecar

Line Keys Available with Monochrome Sidecar

Line Keys Available with Colour Sidecar

Cisco 501

6

N/a

36 

Cisco 504

2

 N/a

32

Cisco 509

10

N/a

40 

Cisco 525

3

N/a

33 

Cisco MPP 8841

10

N/a

N/a

Cisco MPP 8851

10

N/a

72**

Cisco MPP 8861

10

N/a

108**

Polycom SoundPoint 650

4

44

92 

Polycom VVX250

4

N/a

N/a

Polycom VVX310

4

44

92 

Polycom VVX411

10

50

 94

Polycom VVX450

12

N/a

102

Polycom VVX500

14

54

98 

Polycom VVX600

14

54

98 

Polycom VVX601

14

54

98

Yealink W52P DECT

N/a

N/a

N/a

*Please note the VVX150, Trio 8500 and 8800’s do not support Busy Lamp Fields

** This is the maximum number of line keys available as the Cisco 8851 supports up to 2 KEMs and the 8861 device supports up to 3 KEMs. The Cisco 8841 does not support a KEM. Each KEM has 18 line keys per page and 2 pages (36 line keys in total). So up to 72 additional line keys can be supported on the 8851 device and 108-line keys for the 8861 device.

Note: In order for the device to be able to power up the KEMs either a POE+ switch must be used or the power adaptor (CP-PWR-CUBE-4=).

If you are experiencing issues with Busy Lamp Fields please see the Network Configuration Guidelines and the Horizon Technical Support articles on the Knowledge Base.

Setup and Edit Busy Lamp Fields (BLFs) #

Busy Lamp Fields can only be set up by a Company Administrator.

Step 1

Log into the Gamma Portal and go to Provisioning and Service Management, Hosted, Horizon and Horizon Manage Company.

Step 2

Select your account and locate the company that you want to set up Busy Lamp Fields for by using the “Actions” button and selecting “Login to Horizon”.

Step 3

Go to “Users” and “List Users”. Locate the user that you want to add Busy Lamp Fields for and then click the “Edit” button.

A screenshot of a computer

Description automatically generated

Step 4

Select the “Call Setup” tab, under the “Incoming Calls” tab select “Advanced” and then “Busy Lamp”

A screenshot of a computer

Description automatically generated

Step 5

Horizon will detect to see if the user’s device is compatible with Busy Lamp. If not, you’ll be returned with an error message.

If the handset is compatible with Busy Lamp, select if you have a Sidecar installed, and then what users you want to be “monitored”.

You can remove Busy Lamp Fields (BLFs) by clicking the “X” next to the user you want to remove. Click Save.

A screenshot of a computer

Description automatically generated

To ensure that the BLFs do not interfere with incoming calls to that handset, please ensure that “hide call details of monitored users” is ticked ‘yes’.

Busy Lamp Field (BLF) Name Searching #

The portal has been updated to improve searching for a user when editing a BLF. Previously users were only searchable by the full username

A screenshot of a computer

Description automatically generated

The search has been improved to now include the First and Last Name fields and will return results on partial matches of the user’s first and/or last name.

A screenshot of a computer

Description automatically generated
Updated on 20/12/2023
Availability ProfilesComfort Messages
Contents
  • Setup and Edit Busy Lamp Fields (BLFs)
  • Busy Lamp Field (BLF) Name Searching

Copyright © 2026 -  Gamma Telecom Ltd

Gamma API
We use cookies to measure performance and make improvements to this service. This includes page views, device/browser, location, and page interactions. We do not collect any information you upload to this site. By agreeing, you consent for your data to be used for this purpose.