Anyone know if there are any general compatibility issues when using Cisco 7912 phones behind a NAT and connecting to a remote 3CX PBX? Our Cisco 7912 phones work fine when connected to the same LAN as 3CX. But not so using NAT. We've tried several different NAT routers and configuration settings. These same phones would always easily connect to our old/discarded PBX using the same NAT routers, which is why I'm now asking the 3CX community the above question. :roll: I would appreciate any input here! Thanks!