This is FreePBX 12
The output of iptables -nL after a reboot:
[root@localhost ~]# iptables -nL
Chain INPUT (policy ACCEPT)
target prot opt source destination
fail2ban-FTP tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 21
fail2ban-apache-auth tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 80
fail2ban-SIP all -- 0.0.0.0/0 0.0.0.0/0
fail2ban-SIP all -- 0.0.0.0/0 0.0.0.0/0
fail2ban-SSH tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 22
fail2ban-recidive all -- 0.0.0.0/0 0.0.0.0/0
ACCEPT all -- 192.168.56.0/24 0.0.0.0/0
ACCEPT all -- 192.168.10.0/24 0.0.0.0/0
ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
IPSPF all -- 0.0.0.0/0 0.0.0.0/0
DROP all -- 0.0.0.0/0 0.0.0.0/0 ctstate INVALID
ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp spts:67:68 dpts:67:68
fail2ban-FTP tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 21
fail2ban-apache-auth tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 80
fail2ban-SIP all -- 0.0.0.0/0 0.0.0.0/0
fail2ban-SIP all -- 0.0.0.0/0 0.0.0.0/0
fail2ban-SSH tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 22
fail2ban-recidive all -- 0.0.0.0/0 0.0.0.0/0
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpts:5060:5082 state RELATED,ESTABLISHED
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpts:5060:5082 STRING match "vm1.addisonburnside.com" ALGO name bm TO 65535
LOG udp -- 0.0.0.0/0 0.0.0.0/0 udp dpts:5060:5082 limit: avg 5/min burst 5 LOG flags 0 level 4 prefix `SIP - No domain match: '
DROP udp -- 0.0.0.0/0 0.0.0.0/0 udp dpts:5060:5082
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpts:10000:19000
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:4569 state RELATED,ESTABLISHED
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:4569 STRING match "vm1.addisonburnside.com" ALGO name bm TO 65535
DROP udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:4569
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:22
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:194
ACCEPT udp -- 192.168.10.0/24 0.0.0.0/0 udp dpt:123
DROP all -- 0.0.0.0/0 0.0.0.0/0
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
Chain IPSPF (1 references)
target prot opt source destination
RETURN all -- 10.8.8.0/24 0.0.0.0/0
RETURN all -- 192.168.10.0/24 0.0.0.0/0
RETURN all -- 192.168.0.0/23 0.0.0.0/0
DROP all -- 10.0.0.0/8 0.0.0.0/0
DROP all -- 172.16.0.0/12 0.0.0.0/0
DROP all -- 192.168.0.0/16 0.0.0.0/0
DROP all -- 0.0.0.0/8 0.0.0.0/0
DROP all -- 100.64.0.0/10 0.0.0.0/0
DROP all -- 127.0.0.0/8 0.0.0.0/0
DROP all -- 169.254.0.0/16 0.0.0.0/0
DROP all -- 192.0.0.0/24 0.0.0.0/0
DROP all -- 192.0.2.0/24 0.0.0.0/0
DROP all -- 198.18.0.0/15 0.0.0.0/0
DROP all -- 198.51.100.0/24 0.0.0.0/0
DROP all -- 203.0.113.0/24 0.0.0.0/0
DROP all -- 224.0.0.0/4 0.0.0.0/0
DROP all -- 240.0.0.0/4 0.0.0.0/0
DROP all -- 255.255.255.255 0.0.0.0/0
DROP all -- 0.0.0.0/0 0.0.0.0/8
DROP all -- 0.0.0.0/0 127.0.0.0/8
DROP all -- 0.0.0.0/0 224.0.0.0/4
DROP all -- 0.0.0.0/0 255.255.255.255
DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x3F/0x00
DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x3F/0x3F
DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x3F/0x29
DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x3F/0x37
DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x06/0x06
DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x03/0x03
DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x3F/0x01
REJECT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x12/0x12 ctstate NEW reject-with tcp-reset
DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:!0x17/0x02 ctstate NEW
DROP udp -- 0.0.0.0/0 0.0.0.0/0 length 0:28
DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x17/0x02 recent: UPDATE seconds: 1 hit_count: 11 name: INSYN side: source
RETURN tcp -- 0.0.0.0/0 0.0.0.0/0 tcp flags:0x17/0x02 recent: SET name: INSYN side: source
RETURN all -- 0.0.0.0/0 0.0.0.0/0
Chain fail2ban-BadBots (0 references)
target prot opt source destination
RETURN all -- 0.0.0.0/0 0.0.0.0/0
Chain fail2ban-FTP (2 references)
target prot opt source destination
RETURN all -- 0.0.0.0/0 0.0.0.0/0
Chain fail2ban-SIP (4 references)
target prot opt source destination
RETURN all -- 0.0.0.0/0 0.0.0.0/0
RETURN all -- 0.0.0.0/0 0.0.0.0/0
Chain fail2ban-SSH (2 references)
target prot opt source destination
RETURN all -- 0.0.0.0/0 0.0.0.0/0
Chain fail2ban-apache-auth (2 references)
target prot opt source destination
RETURN all -- 0.0.0.0/0 0.0.0.0/0
Chain fail2ban-recidive (2 references)
target prot opt source destination
RETURN all -- 0.0.0.0/0 0.0.0.0/0