I have connected the FritzBox 7530 behind a Sunrise-Box ale router. WLAN works fine. My question:
How do I get the telephony via 7530 to work? When I want to enter a telephone number, the 7530 asks for the provider. I select another provider, as Sunrise (and also Swisscom) do not appear at all. Then the 7530 asks for the registrar (I used grb.ims.sunrise.ch) and the user name and password. Sunrise Support was unable to help. Does anyone know what the correct procedure is for setting up telephony in the 7530 with Sunrise. Thank you for your support.

Question

I have connected the FritzBox 7530 behind a Sunrise-Box ale router. WLAN works fine. My question:
How do I get the telephony via 7530 to work? When I want to enter a telephone number, the 7530 asks for the provider. I select another provider, as Sunrise (and also Swisscom) do not appear at all. Then the 7530 asks for the registrar (I used grb.ims.sunrise.ch) and the user name and password. Sunrise Support was unable to help. Does anyone know what the correct procedure is for setting up telephony in the 7530 with Sunrise. Thank you for your support.

Answer

We have programmed the UPC router in "pass-through". The landline telephone continues to run via the UPC box. That's how everything works.
LG

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Question about AVM FRITZ!Mesh set: FRITZ!Box 7530 + FRITZ!Repeater 1200 International / CH