FRITZ!Fon C4 Service - Knowledge Base
Functions that can be used with base stations from other manufacturers
All FRITZ!Fon models support the DECT standard and the DECT GAP profile. The DECT GAP profile enables you to use cordless telephones with base stations from different manufacturers. It also covers basic functions such as the procedure for registering a telephone with a base station and making telephone calls.
However, DECT GAP does not define additional convenience functions, which means that we cannot guarantee they will work with a base station from a different manufacturer. The call list, telephone book, answering machine, clock, internet services, software update function, RSS feeds, and email are only available if a FRITZ!Box is used as the base station.
By default, German is the default language of FRITZ!Fon. Once it registers with a FRITZ!Box, it uses the language selected in the FRITZ!Box user interface. Since language selection is controlled automatically, you cannot change the language if the telephone is registered with a base station from a different manufacturer.