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Configure Busy Lamp Field (BLF) on the Cisco IP Phone 7800 Series and the Cisco IP Phone 8800 Series

Objective

The Busy Lamp Field (BLF) is the indicator light on an IP Phone which makes the status of another telephone in the network visible to a watcher, typically a front desk clerk or a secretary. The purpose of BLF is to determine the status of another extension at a glance. It is usually configured in the web-based utility of the phone. It may also be configured on the call manager when one is being used. BLF usually has the following behavior:

  • Green (steady) – Active call or two-way intercom call
  • Green (flashing) – Held call
  • Amber (steady) – Privacy in use, one-way intercom call, Do Not Disturb (DND) active, or logged into a Hunt Group
  • Amber (flashing) – Incoming call or reverting call
  • Red (steady) – Remote line in use (shared line or Line Status)
  • Red (flashing) – Remote line on hold

Note: BLF is not available on the Cisco IP Phone 7811.

This article aims to show you how to configure the BLF on the Cisco IP Phone 7800 Series and Cisco IP Phone 8800 Series using:

  • Uniform Resource Identifier (URI) — URI represents a resource from the Internet, or a server. It is typically accessible by a browser, using the http protocol. This may prove beneficial for certain applications, like deploying a simple BLF configuration.
  • Extended Function — This option allows you to invoke a function. For example: fnc=sd; to invoke the speed dial function. Compared to a URI deployment, using the Extended Function allows for easier configuration when doing multiple watchers to a phone.

Note: If you are using a call manager, check its product documentation to know how to configure BLF.

Applicable Devices

  • IP Phone 8800 Series
  • IP Phone 7800 Series

Software Version

  • 10.4

Configure Busy Lamp Field

Using URI

Step 1. Access the web-based utility.

Step 2. Click Admin Login >advanced.

Step 3. Click Voice > Attendant Console.

Step 4. Enter the BLF List URI in the BLF List URI field.

Note: In this example, the BLF List URI is 9727441325_blf.

Step 5. For Use Line Keys for BLF List, choose Yes from the drop-down menu if the line keys of the phone are to be utilized.

Note: If a Key Expansion Module (KEM) is connected, line keys on the KEM will be used after the line keys on the phone have been used up.

Step 6. Click Submit All Changes.

You should now have configured BLF using URI on the Cisco IP Phone 8800 Series.

Using Extended Function

Step 1. Access the web-based utility of the Cisco IP Phone 8800 Series.

Step 2. Click Admin Login >advanced.

Step 3. Click Voice > Phone.

Step 4. Choose the extension that will become the watcher. The status of the phone being monitored will be visible on the phone of the watcher.

Note: In this example, Line Key 4 is chosen.

Step 5. Choose Disabled from the Extension 4 drop-down menu.

Step 6. Enter the extended BLF string. In this example, fnc=blf;sub=9727441325_blf@$PROXY;ext=9727441324@PROXY is entered, where:

Fnc = definition of the extended function.

Ext = Extension of the speed dial.

Note: In this example, 9727441325 can monitor extension 9727441324 via line 4.

Step 7. Click Submit All Changes.

You should now have configured extended BLF on your Cisco IP Phone 8800 Series.

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