Hi,
from memory I would say yes, as there are RJ11 ports on it. I know that it works with a DECT phone that has a base that is on classic analogue, on that RJ11 socket. That's the configuration I have at home.
But for more security, you should have a look at the manual, here in French:
https://be.avm.de/fileadmin...
From memory, there is a special setting in the router to indicate that you want to use the analog line. My configuration is in English, and it's called "landline phone". There must be an equivalent in French that you can certainly find on this doc.
Greetings.