Install isdnactivecards by entering the following commands in the terminal:
sudo apt update sudo apt install isdnactivecards
Description:
ISDN utilities - active ISDN card support
This package provides firmware-loading utilities for active ISDN cards (the Eicon, Eicon Diva, IBM Active 2000, ICN, or PCBIT-D cards). . The firmware files are not part of the package, they have been removed to comply with the Debian Free Software Guidelines.
Homepage: https://www.isdn4linux.de/
Version: 1:3.12.2007-11-27-1
Section: multiverse/utils