Opensuse iptables

 systemctl stop firewalld

systemctl disable firewalld
zypper in iptables

iptables -I INPUT 2 -m state --state NEW,RELATED,ESTABLISHED -m udp -p udp --dport 5060 -j DROP

https://gist.github.com/ambiorixg12/931f70818752aff5c602b83c055c9726