@Mrbean71 I've contacted technical support. They provided me a beta FW to solve the problem and it has worked.

@Mrbean71 @Marvin_S I think you make a mistake... I've bought the router on a big e-shop. And it is sold on internet every where. I'm talking about this (Archer VR1210V) router:...

@Rudy1677 this: https://forum.fibra.click/d/41043-parametri-voip-tim-fttc-su-modem-tp-link/5 a work around It Is a due to a limityation (bug?) of the router fw I think.

I've bought the modem to use with my ISP TIM. The connection work very well the problem is VOIP. My ISP provided me the outbound proxy but the modem is not capable to resolve the IP address due the...