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.

Step 4
Select the “Call Setup” tab, under the “Incoming Calls” tab select “Advanced” and then “Busy Lamp”

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.

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

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.

