IPTables rules for Asterisk

To allow SIP connection in IPTables, add rules (the first for connections, the second for voice traffic):

sudo iptables -A INPUT -p udp -m udp --dport 5060 -j ACCEPT
sudo iptables -A INPUT -p udp -m udp --dport 10000:20000 -j ACCEPT

To allow connections from a specific address only, instead of the rules above, we indicate (where 192.168.1.50 is a trusted IP address):

sudo iptables -A INPUT -p udp -m udp -s 192.168.1.50 --dport 5060 -j ACCEPT
sudo iptables -A INPUT -p udp -m udp -s 192.168.1.50 --dport 10000:20000 -j ACCEPT

Similarly, for each IP, either directly for the subnet, for example:

sudo iptables -A INPUT -p udp -m udp -s 192.168.1.0/24 --dport 5060 -j ACCEPT
sudo iptables -A INPUT -p udp -m udp -s 192.168.1.0/24 --dport 10000:20000 -j ACCEPT

To remove a rule, we’ll specify the same command, replacing -A with -D, for example:

sudo iptables -D INPUT -p udp -m udp -s 192.168.1.0/24 --dport 5060 -j ACCEPT
sudo iptables -D INPUT -p udp -m udp -s 192.168.1.0/24 --dport 10000:20000 -j ACCEPT

To view the list of rules, use the command:

sudo iptables -nvL

See also my article:
Configuring IPTables

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