Ah, okay. I think the quickest route would be to add in that module, but if sion_a wants to upgrade things anyway then it'll all go to iptables instead. In which case what you'll want will look more like:

iptables -t nat -A PREROUTING -p udp --dport 5060 -d 213.104.13.73 -j DNAT --to-destination 172.19.244.11

Also, IJLTS badgers again for no particular reason.

BADGERS.