I tried to register the phone with a Fritzbox 5490. I can complete the registration process. The phone adopts the name I gave it. However, I cannot make a call. I always get the message:
You are using an incorrect Viop password. Where can I change it? The default PIN in the Fritzbox is 0000.

Question

I tried to register the phone with a Fritzbox 5490. I can complete the registration process. The phone adopts the name I gave it. However, I cannot make a call. I always get the message: 
You are using an incorrect Viop password. Where can I change it? The default PIN in the Fritzbox is 0000.

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Question about Gigaset C430

I tried to register the phone with a Fritzbox 5490. I can complete the registration process. The phone adopts the name I gave it. However, I cannot make a call. I always get the message: You are using an incorrect Viop password. Where can I change it? The default PIN in the Fritzbox is 0000.