My problem is the following. I have a Portuguese Voip Provider called SAPO. My ID is something like +3513020XXXXX I configure the correct settings in X-Lite - works fine. I configure the correct settings in 3Cx Phone - works fine. I configure possible settings in Server (there is a problem with using the plus (+) sign in external name in the server - the phone aparently doesnt have this problem) and i dont get inbound calls. Probably its a NAT problem. I have a ZyXel P660W-T1 V3 with port forwarding enabled(but i have some doubts i'm doing everything right there). The LED light in the port status doenst even blink on incoming calls (so the problem is not an inbound rule i think). But my questions are: Why does it work with X-Lite, and the 3CX Phone, but not with the 3Cx server? How come the 3CX phone suports the + sign but not the server? How come the 3Cx phone connects to the VoIP provider with no aditional NAT settings or firewall twiking, and the server doesnt? Thanks in advance for your time.