FRITZ!Fon C4 – Service - Knowledge Base
Current FRITZ!Box models with DECT functionality and current FRITZ!Fon models support some of the services and functions defined in CAT-iq; however, they are currently not CAT-iq certified. For example, the function HD telephony complies with the new standard, which means that it is completely compatible with all products for HD telephony available on the market that are based on the CAT-iq standard.
In addition, the FRITZ!Box and FRITZ!Fon models from AVM offer a whole range of additional functions that currently cannot be implemented with the CAT-iq standard. For this reason, AVM does not feel that certification is necessary at the moment, nor do we have plans to seek it.