Standard

 /usr/sbin/safe_asterisk

Using screen

Start Asterisk at boot time with a program called "screen". Include this command in the /etc/rc.local:

 /usr/bin/screen -L -d -m /usr/sbin/asterisk -vvvvvvvvvvvvvvvvvvvvvgc

This will launch the very verbose asterisk console detached with screen logging.
You can reattach to it by typing:

 screen -r

The screen log is saved to /screenlog.0

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