Why does nothing ring?

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Hello,

I use already since few months a VoIP and „raus” telephone fold usually also great. Now I do not have however times try my 01212-Nummer from the fixed net to call and I get a bell signal…
Thus, i.e. in the telephone a free character is to hear only with me rings to evenly nothing (even if I do not take give ' s off a connection!). I use VoIP at the Mac over a Vigor 2600V and XPro - ' s gives there possibly. still attitudes which I somehow ignored? How said goes to raustelefonieren great???

Greetings
Andreas