was a flagship router that set industry standards with its support for VDSL (including vectoring), high-speed Dual-Band Wireless AC, and integrated telephony functions (DECT/VoIP). Given its complexity and the wide array of features in its operating system,

The FRITZ!Box 7490 is a legacy device but remains highly supported.

The 7490 has a DECT chip , an ISDN chip , and the TFF offloader . You cannot purely emulate these in standard QEMU. This paper describes a hybrid approach:

This is a fascinating and highly specific topic. A "Fritzbox 7490 Emulator" sits at the intersection of , network protocol reverse engineering , and IoT virtualization .