How to configure a redirection to be able to receive external calls from the local network from an internet box

hello everyone… I have a freepbx server which has the address 192.168.1.201, I made a redirection of my server to the PUBLIC IP address which is 129.2.154.61… I want to be able to receive calls from another city using the public IP address… but how to configure the redirection in My BOX… the configuration of my IP phones will have the public IP address