Voip Web.de does not fold, Authentifizierung missed

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Hello,
me at Web.de for Voip announced. That does not fold unfortunately.
With the installation and/or. the system “Authentifizierung announces to the network examination missed”.
Theoretically I could probably telephone, receive only no telephone calls. In addition I would have to adjust still in the Firewall something. I do not know unfortunately however, how. And do I have to de-energise there any haven? I tried that anyhow. Does not fold however.
Who can help me? Or there is somewhat simpler and better for me.
Would no extra like to use hardware, since it would have to function nevertheless also in such a way, or?
Thank you for your assistance.


Windows XP with SP2, Norton Internet Security
Internet binding: DSL with Arocr
Voip registration with Web.de
Rout: Zyxel

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shifted range into the Web.de

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Normally that adjusts itself automatically.
If you have the software of Web.de, Vienna XP and your user name WITHOUT web.de appendix sammt correct password….
then it should fold.