Mikrotik : NAT IP

/ip firewall nat
add chain=dstnat dst-address=10.5.8.200 dst-port=21 protocol=tcp action=dst-nat to-addresses=192.168.0.109


/ip firewall nat add chain=dstnat dst-port=5060 action=dst-nat protocol=tcp to-address=172.18.15.243 to-port=5060 
/ip firewall nat add chain=dstnat dst-port=5060 action=dst-nat protocol=udp to-address=172.18.15.243 to-port=5060

Liens

https://wiki.mikrotik.com/wiki/Manual:IP/Firewall/NAT