Sangoma’s res_mwi_devstate patch (https://wiki.freepbx.org/display/FPG/Subscribe+a+BLF+button+to+Monitor+a+Voicemail+Box)
Along with increasing the MAX_STACK patch (https://issues.freepbx.org/browse/FREEPBX-15656)
Are now both standard in asterisk! Meaning if you aren’t using the FreePBX Distro you can utilize both of these features immediately immediately in 13.26 and 16.3.
This is more proof that the merger between Digium and Sangoma only benefits the open source community at large!
Enjoy!