I did a clean install of FreePBX 13 with Asterisk 13 on a new machine (older machine, same version, system crashed so I decided to change server computers)… Anonymous and guest are disabled. Fail2ban isn’t catching attempted hacks, and Firewall isn’t blocking them either. Here’s a part of the call log. None of these are extensions on my system.
2015-12-01 06:27:56 1448980076.62 101 Congestion s [from-sip-external] ANSWERED 00:12
2015-12-01 06:27:55 1448980075.61 5000 Congestion s [from-sip-external] ANSWERED 00:12
2015-12-01 06:18:10 1448979490.60 5000 Congestion s [from-sip-external] ANSWERED 00:13
2015-12-01 06:08:31 1448978911.59 5000 Congestion s [from-sip-external] ANSWERED 00:13
2015-12-01 05:58:41 1448978321.58 5000 Congestion s [from-sip-external] ANSWERED 00:13
2015-12-01 05:48:52 1448977732.57 1002 Congestion s [from-sip-external] ANSWERED 00:13
2015-12-01 05:47:58 1448977678.56 300 Congestion s [from-sip-external] ANSWERED 00:12
2015-12-01 05:47:49 1448977669.55 300 Congestion s [from-sip-external] ANSWERED 00:13
2015-12-01 05:39:00 1448977140.54 1002 Congestion s [from-sip-external] ANSWERED 00:12
2015-12-01 05:29:18 1448976558.53 1002 Congestion s [from-sip-external] ANSWERED 00:13
2015-12-01 05:19:26 1448975966.52 1002 Congestion s [from-sip-external] ANSWERED 00:12
2015-12-01 05:09:35 1448975375.51 4000 Congestion s [from-sip-external] ANSWERED 00:13
2015-12-01 04:59:49 1448974789.50 4000 Congestion s [from-sip-external] ANSWERED 00:13
2015-12-01 04:49:56 1448974196.49 4000 Congestion s [from-sip-external] ANSWERED 00:12
2015-12-01 04:39:42 1448973582.48 4000 Congestion s [from-sip-external] ANSWERED 00:12
2015-12-01 04:29:42 1448972982.47 3000 Congestion s [from-sip-external] ANSWERED 00:13
2015-12-01 04:19:50 1448972390.46 3000 Congestion s [from-sip-external] ANSWERED 00:12
2015-12-01 04:09:55 1448971795.45 3000 Congestion s [from-sip-external] ANSWERED 00:12
2015-12-01 04:00:03 1448971203.44 3000 Congestion s [from-sip-external] ANSWERED 00:13
2015-12-01 03:50:05 1448970605.43 2000 Congestion s [from-sip-external] ANSWERED 00:13
2015-12-01 03:40:13 1448970013.42 2000 Congestion s [from-sip-external] ANSWERED 00:13