UniFi VoIP - How Configure Busy Lamp Field (BLF)


Readers will learn how to configure Busy Lamp Field on the UVP.

Table of Contents

  1. Requirements
  2. How to Configure BLF on the UVP
  3. Understanding BLF and BLF Hints


  1. PBX that supports BLF
  2. UVP with version 5.0.3 or greater

BLF Configuration on the UVP

  1. Enable option Show BLF in the Settings -> UI, then navigate back to the main dialer.
  2. Navigate to the BLF tab(last tab on the right) on the Main Menu
  3. Tap the Add New Button
  4. Tap the Add people Button
  5. Select the contact you would like to add to the BLF interface, then tap the checkmark in the top right corner to proceed.
  6. Under the Number section, tap on Not specified.
  7. A list of numbers for this contact should appear.  Select the extension or number you would like the BLF interface to provide presence or dial when tapped.
  8. Tap the checkmark in the top right corner to save the BLF buddy.
  9. Repeat steps 4-8 to add multiple BLF buddies.
  10. Tap the checkmark in the top right corner to save the BLF list, and navigate back to the main BLF interface.

Understanding BLF and BLF States

If UVP A wants to be informed of state or event changes for UVP B, then it sends a SUBSCRIBE request to the SIP Server, so that UVP A is aware of the event or state UVP B. If UVP A SUBSCRIBE request to the SIP Server acknowledges with response 200, then UVP A will receive a NOTIFY request from the SIP Server if UVP B's event or state changes.  To read more about BLF check out RFC3265.

UVP Available State(Blue) - Extension 101 and 102 are available.

UVP Ringing State(Yellow) - Extension 102 is dialing 101, but call 101 has not yet answered the call.

UVP Call In Progress/On call State(Red) - Both 101 and 102 are currently on a call in progress.