M2 security
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IPs of TP and OP are automatically whitelisted and other IPs are blocked for SIP calls.
In addition there is Fail2ban which saves agains SSH bruteforcing.
You can also block IPs manually, to prevent accessing GUI:
http://wiki.kolmisoft.com/index.php/M2_Blocked_IPs
or you can block whole countries:
http://wiki.kolmisoft.com/index.php/M2_Blocked_Countries
all these works by adding rules to iptables.