I wasn’t aware that the feature had been merged with Asterisk back in April of 2019.
The Wiki page on this feature, which hasn’t been updated since September 14, 2015, still says that:
“In version 2.11 and above, your FreePBX Distro, PBXact, and Sangoma PBX GUI software allows the creation of busy lamp field (BLF) hints for voicemail boxes.”
Also, the tooltip for this feature still reads:
“Setting this flag with generate the required dialplan to integrate with res_mwi_devstate (res_mwi_blf) which is included with the Official FreePBX Distro . It allows users to subscribe to other voicemail box and be notified via BLF of changes.”
This discussion ties in nicely with the other recent posts that I’ve been making about the documentation being out of date, and that you often have to scour the forums, the blogs, and other resources to find updated information.
This leads to yet another question: If the code was added to asterisk to support it, was a corresponding change made to include the code in all versions of FreePBX, or is the relevant FreePBX code still only included with the Distro, PBXact, and Sangoma PBX?