I have been a fan of Asterisk, and in particular the project The Incredible PBX.
However, they charge $20 per year to update (for the raspberry pi). This updater installs security updates, among other things. They explain that the alternative is to backup the entire server and install a fresh copy with the newest updates (follow by restoring the settings) if you want to avoid using their paid updater.
Is there another way to update The Incredible PBX without using their paid utility? Is it a simple method of apt-get upgrade or something similar? I'm all for a free solution, and I'd rather go to a different distribution than pay an annual fee for updates. Has anyone made a fork for this purpose (kind of like how CentOS is to Redhat)?