Continuing trend of porting full featured suites to humble Pi, we have another example…

Incredible PBX 3.11 for the Raspberry Pi featuring the very latest Asterisk 11 and FreePBX 2.11 versions.

Incredible PBX: What Is It?

Incredible PBX is a secure and feature-rich implementation of the terrific Asterisk® PBX. By rethinking the PBX security model from the ground up, Incredible PBX was engineered to provide rock-solid security while delivering the most comprehensive collection of Asterisk utilities available on the planet including free calling in the U.S. and Canada courtesy of Google Voice.

via — The Incredible PBX turnkey version of PBX in a Flash.