Hi there, I've been using a Fritzbox 1020 with sipgate for incoming call and justvoip for outgoing for over a year now without any problems but just added another sipgate phone number using the 2nd phone option on the device but get this error when registering. 02.02.09 13:44:05 Registration of Internet number 3934764 failed. Reason for error: DNS error Cheers, Bob