Pfsense with New asterisk distro not working

[Musote]

Hello everybody!!!

I have a very strange problem.

We used to have an old asterisk not behind pfsense running in a hp 2gigs ram + dual core desktop pc with a fixed IP.
Also with a separated fixed ip our pfsense 2.2.3 with just a firewall rule that says all ports are open to pbx IP.

It worked fine for all the company for years.

Now we changed to a Lenovo server with the latest asterisk distro and with deployed the new box with the IP used by the old pbx but all phones behind pfsense cannot even register on pbx, only when we move some hard phone to some dsl they register on pbx.

Any ideas?

Thank you very much