Dear this note is only for fresh administrators don't think about asterisk security. I found fail2ban very useful for anti asterisk hacking, so I want to share it with fresh admins. some hackers try your sip or iax2 ip with a lot of username/password, may be after 1 million try, one username/password was accepted. so in 2-3 hours, they use all of the credit of the hacked user. fail2ban, runs as service, and checks the logs, and blocks the suspicious IPs.
for more info: http://www.fail2ban.org/wiki/index.php/Asterisk http://www.voip-info.org/wiki/view/Fail2Ban+(with+iptables)+And+Asterisk best
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