Rpi Asterisk
Install Asterisk on the Raspberry Pi
FreePBX
Running Asterisk 1.8 with FreePBX 2.9.0.12 on Debian.
FreePBX struggles at times and causes 100% CPU load.
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Raspbian
Install most recent version of Asterisk:
apt-get install asterisk
Configure Asterisk
Then configure /etc/asterisk/sip.conf and /etc/asterisk/extensions.conf