FreePBX Commercial Pro Modules are additional commercial modules that can be added to enhance and add functionality to a base install of FreePBX Distro. Commercial Modules can be purchased in the FreePBX Distro Market Place and are only supported on the FreePBX Distro platform. We also recommend only using Asterisk 11 or 13 with commercial modules. For official stance on using PJSIP please visit this wiki page. FreePBX in the default Extension mode is the only supported mode and if you have your system setup with Device and User mode alot of commercial modules will not work and we can not provide support or assistance on it.