Instal Jitsi meet on Ubuntu 20.04 behind NAT

install jitsi

wget -qO - https://download.jitsi.org/jitsi-key.gpg.key | sudo apt-key add - 
sudo sh -c "echo 'deb https://download.jitsi.org stable/' > /etc/apt/sources.list.d/jitsi-stable.list"
sudo apt install apt-transport-https
sudo apt -y update
sudo apt -y install jitsi-meet

install certbot

sudo apt install certbot python3-certbot-nginx
sudo certbot --nginx -d meet.example.com

systemctl show certbot.timer
cat /etc/cron.d/certbot
sudo certbot renew –dry-run

add your IP addresses

sudo su
vim /etc/jitsi/jicofo/sip-communicator.properties
#add lines
# private IP
org.ice4j.ice.harvest.NAT_HARVESTER_LOCAL_ADDRESS=10.134.254.9
# public IP
org.ice4j.ice.harvest.NAT_HARVESTER_PUBLIC_ADDRESS=183.141.181.124
# must be static

Forward ports to jisti

80/tcp
443/tcp
4443/tcp
10000/udp