Busy Lamp Field (BLF) indicates extensions in-use by displaying "presence" on a device. Presence indicates the status of another user, such as idle, ringing, or on a call.

Introduction

Supported Models

Configuring Busy Lamp Field on Cisco Phones and Attendant Consoles

Configuring BLF on Polycom Desk Phones and Attendant Consoles

 

Introduction

Hosted PBX supports the configuration of Busy Lamp Field (BLF) Monitoring functions on Cisco and Polycom desk phones.  BLF typically supports the following features (depending on the specific device’s capabilities and configuration):

 

  • The line keys on a HPBX phone or associated attendant console can be configured as BLF keys to monitor the status of other phones in the same company.  
  • BLF keys will display the status of the monitored phones, including whether the other phone is idle, busy, or ringing.
  • When the monitored phone is idle, the BLF key can be used as a speed dial.
  • When there is an incoming call on a monitored phone, the BLF key can be used to answer the other phone’s incoming call.
  • When on a call, pressing an idle BLF will perform a transfer of the current call to the other phone, or alternatively will place the current call on hold and make a call to the BLF extension (depending on target device and configuration).

 *******PLEASE DO NOT IMPLEMENT BUSY LAMP FIELD WITH SIMULTANEOUS HUNT GROUPS. THIS WILL REPLICATE CALLS AND OVERSATURATE THE CUSTOMERS NETWORK*****

Note:  To configure Busy Lamp Field keys on a phone requires logging into the local phone’s administrative interface.   This requires you to know the local IP address of the phone, and have access to a computer connected directly to the same local network as the phone.  Please contact Smarsh Hosted Services support for assistance. 

HPBX phones are managed by a central configuration server, which means the firmware and normal configuration of the phone is automatically managed and updated as necessary.  

To support BLF, the central configuration server will “ignore” and not change any BLF settings which have been manually configured on the phone.   This allows the flexibility to manually configure the BLF line keys as desired, and at the same time rely on the central configuration server to continue to automatically manage and update firmware and other critical configuration information.

Supported Models

Supported phones and attendant consoles include:

Desk Phone

Attendant Console

Polycom

VVX 300/310/400/410/500/600

VVX Color Expansion Module

Cisco

SPA303/SPA504G/SPA525G2

SPA500DS (Applies only to SPA502G / SPA525G2)

Yealink

T40P/T41P/T42G/T46G/T48G

 Configuring Busy Lamp Field on Cisco Phones and Attendant Consoles

To configure BLF Monitoring on a supported Cisco device, please follow the instructions as outlined below for each device that will be used to monitor other phones. 

  1. Contact Smarsh Hosted Services support team and request a custom admin password be assigned for each specific phone that you wish to setup to monitor BLF.
    Note: You will only need a custom password for the phones that will actually be monitoring the BLF status of other phones; you do not need to change the configuration on the phones that are being monitored. 
  2. Log into the phone’s admin Interface using the custom password.
    • To log into to the phone’s Admin interface you will need the local IP address of the phone. Note that this requires you have access to a computer connected directly to the same local network as the phone. Due to compatibility issues, please use a browser other than Google Chrome.
  3. In Cisco phone Att Console tab, set the following:
    • Subscribe Expires: 600
    • Server Type: Asterisk
    • Attendant Console Call Pickup Code: *95#
    • Call Pickup Audio Notification can be optionally enabled to sound a beep when a BLF phone is ringing.
    • If BXfer On Speed Dial Enable is set to Yes, this will allow the user to use the BLF line key to do a blind transfer, however note this will disable the Park custom soft
    • If this setting is set to No, then when a user has a connected call, pressing the BLF key will place the connected call on hold, and will make a new call to the BLF ext. The user can always do a blind/attended transfer using the normal soft keys.
      Cisco 'Att Console' 
  4. For each extension to be monitored, add a specific BLF in the Phone tab:
    • Extension: Disabled
    • Extended Function: fnc=blf+sd+cp;sub=105@$PROXY:6060;nme=some name 105
      • The parameter sub is used to specify the extension being monitored
      • The parameter nme is used to specify the displayed name and extension of the person being monitored (limit 15 characters)
    • Note: The first extension on the phone (the top line key) must always be set to the user’s own extension, and not configured for BLF.
    • Do not change any other configuration settings on the phone as other settings are managed by the central configuration server.

Phone Tab Settings

 Configuring BLF on Polycom Desk Phones and Attendant Consoles

To configure BLF monitoring on a supported Polycom device, please follow the instructions as outlined below.

    1. Contact your HPBX partner support team and request a custom admin password be assigned for each specific phone that you wish to setup to monitor BLF.  
      • Note: you will only need a custom password for the phones that will actually be monitoring the BLF status of other phones; you do NOT need to change the configuration on the phones that are being monitored.
    2. Log into the phone’s admin Interface using the custom password which you can get from Smarsh Hosted Services support.
    3. Change the number of line keys for the user’s extension.  
    4. Select Setting and then Lines and Line1 and set the following:
        • Number of Line Keys: 1
        • Calls Per Line: 6 (according to the phone type)
      Polycom Setup Lines Tab
    5. Select Utilities and then Line Key Configuration
      • Click the Add Line Key Function and select Static BLF.
      • Enter the monitored extension in the Label and Address
      • Click Save to add the BLF line.
        Line Key Configuration
    6. Note: The first extension on the phone (the top line key) must always be set to the user’s own extension, and not configured for BLF. Please do not change any other configuration settings on the phone as other settings are managed by the central configuration server.

Configuring BLF on Yealink Desk Phones

To configure BLF List settings via web user interface:

               1. Click on Account->Advanced.

               2. Select the desired account from the pull-down list of Account.

               3. Enter the BLF List URI in the BLF List URI field.

               4. (Optional.) Enter the directed pickup code in the BLF List Pickup Code field.

               5. (Optional.) Enter the barge-in code in the BLF List Barge In Code field.

               6. (Optional.) Enter the call park retrieve code in the BLF List Retrieve Call Parked Code field.

               7. Click Confirm to accept the change