Linux v5.2.1 - isdn
# SPDX-License-Identifier: GPL-2.0-only
# ISDN device configuration
bool "ISDN support"
depends on NET && NETDEVICES
depends on !S390 && !UML
ISDN ("Integrated Services Digital Network", called RNIS in France)
is a fully digital telephone service that can be used for voice and
data connections. If your computer is equipped with an ISDN
adapter you can use it to connect to your Internet service provider
(with SLIP or PPP) faster than via a conventional telephone modem
(though still much slower than with DSL) or to make and accept
voice calls (eg. turning your PC into a software answering machine
Select this option if you want your kernel to support ISDN.
tristate "Old ISDN4Linux (deprecated)"
depends on TTY
This driver allows you to use an ISDN adapter for networking
connections and as dialin/out device. The isdn-tty's have a built
in AT-compatible modem emulator. Network devices support autodial,
channel-bundling, callback and caller-authentication without having
a daemon running. A reduced T.70 protocol is supported with tty's
suitable for German BTX. On D-Channel, the protocols EDSS1
(Euro-ISDN) and 1TR6 (German style) are supported. See
<file:Documentation/isdn/README> for more information.
ISDN support in the linux kernel is moving towards a new API,
called CAPI (Common ISDN Application Programming Interface).
Therefore the old ISDN4Linux layer will eventually become obsolete.
It is still available, though, for use with adapters that are not
supported by the new CAPI subsystem yet.
tristate "CAPI 2.0 subsystem"
This provides CAPI (the Common ISDN Application Programming
Interface) Version 2.0, a standard making it easy for programs to
access ISDN hardware in a device independent way. (For details see
<http://www.capi.org/>.) CAPI supports making and accepting voice
and data connections, controlling call options and protocols,
as well as ISDN supplementary services like call forwarding or
three-party conferences (if supported by the specific hardware
Select this option and the appropriate hardware driver below if
you have an ISDN adapter supported by the CAPI subsystem.
endif # ISDN_CAPI
endif # ISDN