web.de too sipgate keie verbidung

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Hello,

tried times a freephone friend has with sipgate to call with my Web.de. Unfortunately occupied the indication and no connection come however always develop. Also in the Internet on the Web.de side it is not shown to me that I selected this number.

To my hardware.
Use a Grandstream Handytone AT-286 in such a way or. The small black box.
My friend has a IP telephone of siptronic.

In the German fixed net, on mobile phones and in the 1und1 Voip net I can easily calls. Only stop not too sipgate.

What kan I make there? To another Provider, but needs web.de would change to 1und1 to telephone over free of charge.