default or selected kernelversion does not have config value CONFIG_HISAX_HFCUSB.
Result is shown for kernelversion 6.9.9
HFC USB based ISDN modems
modulename: hfc_usb.ko
configname: CONFIG_HISAX_HFCUSB
Linux Kernel Configuration
└─>Device Drivers
└─>ISDN support
└─>Old ISDN4Linux (deprecated)
└─>Passive cards
└─>HFC USB based ISDN modems
In linux kernel since version 2.6.20 (release Date: 2007-02-04)
This enables the driver for HFC USB based ISDN modems.