Ip route static (inside,outside) X.X.X.X X.X.X.X 255.255.255.255
access-list ACL_IN extended permit tcp any host X.X.X.X eq 3389
ip nat translation timeout 600
ip nat inside source list 1 interface Serial1/0:0 overload
ip nat inside source static tcp X.X.X.X 3389 X.X.X.X 3389 extendable