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.
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 NOTE: PLEASE DO NOT IMPLEMENT BUSY LAMP FIELD WITH SIMULTANEOUS HUNT GROUPS. THIS WILL REPLICATE CALLS AND OVERSATURATE THE 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 phones and attendant consoles include:
VVX Color Expansion Module
SPA500DS (Applies only to SPA502G / SPA525G2)
EXP 40 (Applies only to Yealink T46G and T48G. Yealink T42G does not support expansion module).
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.
- 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.
- 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.
- 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.
- 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.
To configure BLF monitoring on a supported Polycom device, please follow the instructions as outlined below.
- 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.
- Log into the phone’s admin Interface using the custom password which you can get from Smarsh Hosted Services support.
- Change the number of line keys for the user’s extension.
- 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)
- 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.
To configure BLF List settings via web user interface:
- Log into the Yealink’s Web User interface, using the admin and password. This may have been customized by your representative or IT personnel (eg: User: Admin; Password: 856974)
- Select the Dsskey option at the top of the screen.
- From here you will have a varying amount of tabs on the left, depending on the model of Yealink Desk phone you have. The image below is an example of the Yealink T48G, which has up to 29 line keys programmable.
- Choose Line, BLF, or Speed Dial from the dropdown, underneath the Type column; then, if applicable, proceed to enter the numeric value in the Value Column (This is the registered DID of the phone extension you are monitoring with this programmable line key).
With BLF, as an option, it is important to put the extension on the Extension column – in this case its 102 on the 5th line key. Be sure to label it also. Now this phone, extension 101, will see when 102 rings.
- Then you can label it, mainly for appearance purposes, in the Label column.
- Within the Line Column make sure and set the line to Line 1 for all functions. The notable exception for this is when having another registered DID attached to this phone (this would be in accounts 2 through 5, on this model).
For example, if you have a second DID you would make a Line Key, listed as the 6th one in the example below, make sure you have Line2 in the Line column.
Note: The best way to remember if you have multiple lines to program is to navigate, from the top, to Account >> Register >> Account drop down >> Click on accounts other than account 1. If you see populated information on the resulting page, you will know you have the option of doing a separate line key on the BLF options from before.
- Click Confirm to accept the change, and the phone will reboot. This concludes the local BLF options for Yealink desk phones.