Firewall setup Asterisk at Debian 11

A list of commands to setup Firewall for Asterisk

sudo apt update
sudo apt install ufw -y

Allow port access on the firewall by running the following command:

sudo ufw allow 80

sudo ufw allow 22

sudo ufw allow 10000:20000/udp

sudo ufw allow  5060:5061/udp

check status

sudo ufw status verbose

Status: inactive

turn on

sudo ufw enable

set ports in config

sudo tee /etc/asterisk/rtp.conf<<EOF
[general]
rtpstart=10000
rtpend=20000
EOF

verify

nano /etc/asterisk/rtp.conf

you can view the status

sudo ufw status verbose