Someone

%pre
# add user/group asterisk/asterisk so we can run asterisk as the
# asterisk user for better security

# if not exist add the asterisk group
if grep -c "^asterisk:" /etc/group >> /dev/null ; then
	:
else
	# add the asterisk group (system account)
	/usr/sbin/groupadd -r -f asterisk
fi

# if not exist add the asterisk user
if grep -c "^asterisk:" /etc/passwd >> /dev/null ; then
	:
else
	# add the asterisk user (system account)
	/usr/sbin/useradd -c "Asterisk VoIP PBX" -g asterisk \
	-r -s /sbin/nologin -m -d %{_localstatedir}/lib/asterisk \
	asterisk 2> /dev/null
fi