CAPI 2.0 subsystem

modulename: kernelcapi.ko

configname: CONFIG_ISDN_CAPI

Linux Kernel Configuration
└─>Device Drivers
└─>ISDN support
└─>CAPI 2.0 subsystem
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This provides the CAPI (Common ISDN Application Programming
Interface, a standard making it easy for programs to access ISDN
hardware, see <http://www.capi.org/>. This is needed for AVM's set
of active ISDN controllers like B1, T1, M1.

source code:
depends
CONFIG_ISDN

is selected by
CONFIG_ISDN_DRV_GIGASET