Is it safe to open
SIP and VoIP ports are scanned constantly by toll-fraud bots looking for weak extensions. Allow only your provider's IP addresses on the firewall where possible, use long SIP passwords, fail2ban, and disable SIP ALG on the router.
How to open port 5080
Open to everyone
# Linux iptables iptables -A INPUT -p tcp --dport 5080 -j ACCEPT iptables -A INPUT -p udp --dport 5080 -j ACCEPT # Ubuntu ufw ufw allow 5080/tcp ufw allow 5080/udp # firewalld firewall-cmd --permanent --add-port=5080/tcp && firewall-cmd --reload firewall-cmd --permanent --add-port=5080/udp && firewall-cmd --reload # MikroTik /ip firewall filter add chain=input protocol=tcp dst-port=5080 action=accept place-before=0 comment="port 5080" /ip firewall filter add chain=input protocol=udp dst-port=5080 action=accept place-before=0 comment="port 5080" # Windows (PowerShell) New-NetFirewallRule -DisplayName "Port 5080 TCP" -Direction Inbound -Protocol TCP -LocalPort 5080 -Action Allow New-NetFirewallRule -DisplayName "Port 5080 UDP" -Direction Inbound -Protocol UDP -LocalPort 5080 -Action Allow
Only for your addresses
# allow only one address or network (replace 203.0.113.0/24) iptables -A INPUT -p tcp --dport 5080 -s 203.0.113.0/24 -j ACCEPT iptables -A INPUT -p udp --dport 5080 -s 203.0.113.0/24 -j ACCEPT iptables -A INPUT -p tcp --dport 5080 -j DROP iptables -A INPUT -p udp --dport 5080 -j DROP ufw allow from 203.0.113.0/24 to any port 5080 proto tcp ufw allow from 203.0.113.0/24 to any port 5080 proto udp /ip firewall filter add chain=input protocol=tcp dst-port=5080 src-address=203.0.113.0/24 action=accept /ip firewall filter add chain=input protocol=udp dst-port=5080 src-address=203.0.113.0/24 action=accept /ip firewall filter add chain=input protocol=tcp dst-port=5080 action=drop /ip firewall filter add chain=input protocol=udp dst-port=5080 action=drop
If the server is behind a router, you also need a port forward (dst-nat). Behind ISP CGNAT (100.64.0.0/10 on the WAN) forwarding will not help: you need a public IP or a VPN.
What is listening
Check on the server
# what listens on the port ss -lntup | grep ':5080 ' netstat -ano | findstr :5080 # Windows lsof -i :5080 # macOS # test from another machine nc -vz example.com 5080