Hi I downloaded the Voip Software and tried to enter my SIP-Details from my German Voip Account. The Provider is 1und1 (it is from Germany). I figured out that the registrar should be sip.1und1.de. As Username I tried 0049 351 XXX - 0049 is for Germany and 351 is my Area Code without the leading "0". But I am not able to make any Calls. With my VOIP-Software on my computer I am able to call. Maybe there is someone who can help me?