[asterisk-users] fraud detection

[binary dreamer]

hello everyone. i am concerned about security to the PBX and i would like
to discuss different fraud detection methods.
Apart from making everything to secure the PBX (latest patches, iptables,
firewalls, no outside users, strongs passwds,...) i would like to find out
if there are any fraud detection techniques.
As for my setup i do have a PBX running asterisk 11.4 and it has 3 sip
trunks (over internet)
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