Install jitsi behind NAT

i sucessfully installed Jitsi on my local Network with a local IP 172.xxx.xxx.xxx and every local user can connect and it seems that everything is fine. Now i want public my Jitsi server.
i wanna ask that should i reinstall my jitsi server with the NAT IP or i just need NAT my current server?
any one can give me a guide?
thanks in advance!