I'm not able to receive fax anymore after the upgrade to freepbx 13

Yesterday I upgraded my freepbx12 to freepbx13.
In usermanager I enabled the fax for a user
In inbound route I enabled the fax detection (SIP) and in fax destination I selected the extension of a fax enabled user.

Now, when someone send me a fax, I ear the extension phone ringing.

Can you help me?
In freepbx12 the fax works great

PS: in fax configuration I read FAx drivers supported by this module are: Fax for asterisk (res_fax_digium) with license/Spandsp based app_fax (res_fax_spandsp)

My fault. The issue was related to DNS