Technical specifications Features Cordless telephone (DECT GAP standard) for internet and landline calls Supports HD telephony (7-kHz G.722 codec) for natural sound Internet telephony SIP-compliant in accordance with RFC 3261 (in combination with the FRITZ!Box) The ideal complement to all FRITZ! box models with a DECT base station FRITZ!Box functions are easily configured and operated from the...
> https://en.avm.de/products/phone/fritzfon-c6/technical-specifications/
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/
Thanks to this technology you can make cordless telephone calls, use your FRITZ!Fon to listen to music, view pictures, read e-mail, and control your Smart Home devices and media player. But what's behind DECT and how does it work?
> https://en.avm.de/guide/avm-explains-dect/