Instead of cable, I wanted to use LTE because I have a Swisscom unlimited data sim from the company.
Unfortunately, I could not connect my Dec phones because Swisscom does not allow Voip via the datasim.
Now I have connected my old Fritzbox behind the Fritzbox via Lan and can configure and use my two phones on it again.
Does anyone have a better solution?

Question

Instead of cable, I wanted to use LTE because I have a Swisscom unlimited data sim from the company.
Unfortunately, I could not connect my Dec phones because Swisscom does not allow Voip via the datasim. 
Now I have connected my old Fritzbox behind the Fritzbox via Lan and can configure and use my two phones on it again.
Does anyone have a better solution?

Answer

AVM FRITZ!Box 6890 LTE is connected directly via LTE, I use phoneStar as SIP gateway. I also use Swisscom as my mobile phone provider. The DECT phone is connected directly to the AVM FRITZ!Box 6890 LTE via FON 1. The setup has been running perfectly for 12 months.

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Question about FRITZ! Box 6890 LTE International