RasPBX: http://www.raspberry-asterisk.org/

RasPBX Forums: https://sourceforge.net/p/raspbx/discussion/

RasPBX Documentation: http://www.raspberry-asterisk.org/documentation/

Another HowTo: https://www.dslreports.com/forum/r30661088-FreePBX-for-the-Raspberry-Pi

Run this command at the console to install the latest additions and improvements:

raspbx-upgrade

1. Download the latest image
2. Write the image to a 4GB+ MicroSD memory card
   1. Use Win32 Disk Imager
3. Expand the root partition on larger memory cards
   1. raspi-config
   2. Then option expand_rootfs
4. Determine IP address
   1. http://raspbx
   2. ssh -l root raspbx
   3. DHCP lease
   4. ifconfig