In 2020 when RedHat took over CentOS, many predicted it was with the intent of destroying it, being derived from RHEL it was a direct competitor, some say those people have been vindicated, as that's exactly what RedHat did, and its short life-span replacement, CentOS Stream, is just another Fedora, this left FreePBX devs in a bind.
We all (hopefully) backup our PBX's - our config files, databases, even system audio and logs, some of this can be backed up hourly, daily, or weekly, so in all likelihood, you will have at least two backup processes probably more, but where do you back them up to?
Local storage? It's fair to say nearly everyone uses this, but is that the only place you have them? What if your disks fail? A lot of good those backups are now you can't access them!
In the age of NBN, where most POTS exchanges are being turned off (unless you're lucky enough to be in an NBN Wireless footprint where you get to keep your POTS line), SIP (VoIP) is your new and only option, so businesses are going to need to move towards SIP, and like traditional PBX's, that's where thing's get price crazy.
Asterisk and FreePBX allow for a myriad of customisations, some of these however need hand editing asterisk files as well as some FreePBX configuring (due to how FreePBX uses its database and overwrites some asterisk files), so some things you just can't entirely do from within FreePBX, or in asterisk (when using FreePBX that is), like set up Lenny, or provide a Weather service.
Configuring FreePBX to use a VoIP provider is usually simple and quick, but sometimes there's always one of the bunch that wants to be different in how they expect you to configure your Trunk, and Aussie Broadband (affectionately known as Aussie, or ABB) is one of them.
With ABB doing things differently, you'll find the usual way of setting up a SIP trunk in FreePBX wont work, and you'll probably go half insane trying to work out why.
(Original post February 14 2021 updated)
By default, ChanSpy, a supervisor function that allows you to monitor
other peoples calls, is enabled and can be used by anyone, yes, anyone, who's phone is logged in to a FreePBX system that has this feature enabled.
Sangoma don't allow you to secure it out of the box, instead, they try sell you some commercial module (that's about AU$145) that allegedly sets a PIN. But you can do it for free!