Setting up FRITZ!App FonFRITZ!App Fon allows you to conveniently make telephone calls over the FRITZ!Box with your smartphone when you are at home – the smartphone functions as an IP telephone. You can also use FRITZ!App Fon with several FRITZ!Boxes and thus make calls over different FRITZ!Boxes. For this you must set up FRITZ!App Fon once on each FRITZ!Box as described here. After setting it up,...
> https://en.avm.de/service/knowledge-base/dok/FRITZ-Box-7690/251_Setting-up-FRITZ-App-Fon/
Internet Compatible with any connection You can use your FRITZ!Box with any DSL- and IP-based connection. Alternatively, you can run it behind a fiber optic or cable modem and simply integrate it into an existing Wi-Fi network. It can even be operated with a 4G/3G dongle. High speeds with VDSL supervectoring With the FRITZ!Box you're all set for future developments: Thanks to VDSL supervectoring...
> https://en.avm.de/products/fritzbox/fritzbox-7590/details/
Connections / Network Ideal for fiber optics You can use the FRITZ!Box directly on standard fiber optic connections, without an upstream provider modem. Suitable FRITZ!SFP modules for the AON and GPON fiber optic technologies are included in the package contents. Simply plug in and get set up quickly and easily in the user interface. High speed with VDSL supervectoring With FRITZ!Box you are well...
> https://en.avm.de/products/fritzbox/fritzbox-5690-pro/details/