DMZ Host / pass all traffic unfiltered to one LAN IP?

[srynoname]

Hello,

I have some problem with my VoIP phone, already tried forwarding the ports mentioned by my voip isp, didn't change anything. just to make sure it's really a firewall problem, I'd like to pass all traffic unfiltered to the phone (if it then works I know it's the firewall). On cheap routers this is called "DMZ". Someone can please tell me how to do this with pfSense? Thanks for any hint!