vCAC behind NAT firewall/router

Dear All,

For a POC, i have built a vCAC 6 on local infrastructure at home and i would connect to vCAC outside my home using the NAT functionality of the internetbox (nat-router)

But vCAC redirects to "fqdn.localdomain.local" and this domain is not resolved on internet instead of using public IP.

What is the trick to publish vcac through a NAT ? Using a reserve proxy ?

Thank you