default or selected kernelversion does not have config value CONFIG_CAPI_AVM.
Result is shown for kernelversion 6.9.9
Active AVM cards
configname: CONFIG_CAPI_AVM
Linux Kernel Configuration
└─>Device Drivers
└─>ISDN support
└─>CAPI 2.0 subsystem
└─>Active AVM cards
In linux kernel since version 2.6.20 (release Date: 2007-02-04)
Enable support for AVM active ISDN cards.