After 3 days of chat and many hours of GOOGLE I finaly disturb you to get some help. I have an SMC7404WBRA NAT-Boradband router and a Grandstream Budgettone100. I did the latest firmware upgrades. I can register and phone using fwd, sipgate and of course my * if I put the phones-ip on the only DMZ I have on the router. But Im not even able to register with my * when the phone is not on the DMZ. I tried Portworwarding - Stun etc.... but nothing works. Maybe I could get some help here. Thanks in advance, Didelot loic.