Sync with AVM Fritzbox
In the current firmware of Fritzbox some internet address books like Goggle Contacts can be used. Unfortunately I found no way how to sync the Fritzbox with fruux contacts.
Please contact AVM to add this possibility to the Fritzbox firmware

That would be a great feature indeed! We’ve tried to get in touch with AVM about this a couple of times, but never got any response. It would certainly help if more AVM users would suggest that to AVM, too. :-)
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Stromfahrer commented
I submitted this to AVM recently as they improved the addressbook integration in their recent FW update for the FB 7390 (still without a custom CardDAV option)