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Elastix Unified Communications Server Cookbook by Gerardo Barajas Puente

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Enabling BLFs and hints

BLF means Busy Lamp Field. Generally, this is an LED that shows the status of an extension or line, an application, or even the presence of a user.

Sometimes, this LED is physically embedded into a key that when pressed, can enable or disable an application, and depending on these states, the LED can be turned off or on.

In most of the cases, the BLF points to an extension. For example, an assistant can notice if the boss is busy (LED on) or free to be called (LED off). All IP phones support BLF in most cases.

How to do it…

  1. Go to the PBX | Tools | Asterisk File Editor menu.
  2. Edit the extensions_custom.conf file.
  3. Look for the section (properly named context) [from-internal-custom] and add the following line at the end of this context: ...

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