config.help

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CONFIG_ISDN
  This driver allows you to use an ISDN-card 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 is becoming obsolete. It is 
  still usable, though, if you select this option.

CONFIG_ISDN_PPP
  Over digital connections such as ISDN, there is no need to
  synchronize sender and recipient's clocks with start and stop bits
  as is done over analog telephone lines. Instead, one can use
  "synchronous PPP". Saying Y here will include this protocol. This
  protocol is used by Cisco and Sun for example. So you want to say Y
  here if the other end of your ISDN connection supports it. You will
  need a special version of pppd (called ipppd) for using this
  feature. See <file:Documentation/isdn/README.syncppp> and
  <file:Documentation/isdn/syncPPP.FAQ> for more information.

CONFIG_ISDN_MPP
  With synchronous PPP enabled, it is possible to increase throughput
  by bundling several ISDN-connections, using this protocol. See
  <file:Documentation/isdn/README.syncppp> for more information.

CONFIG_ISDN_PPP_VJ
  This enables Van Jacobson header compression for synchronous PPP.
  Say Y if the other end of the connection supports it.

CONFIG_ISDN_PPP_BSDCOMP
  Support for the BSD-Compress compression method for PPP, which uses
  the LZW compression method to compress each PPP packet before it is
  sent over the wire. The machine at the other end of the PPP link
  (usually your ISP) has to support the BSD-Compress compression
  method as well for this to be useful. Even if they don't support it,
  it is safe to say Y here.

CONFIG_ISDN_AUDIO
  If you say Y here, the modem-emulator will support a subset of the
  EIA Class 8 Voice commands. Using a getty with voice-support
  (mgetty+sendfax by [e-mail] with an extension, available
  with the ISDN utility package for example), you will be able to use
  your Linux box as an ISDN-answering machine. Of course, this must be
  supported by the lowlevel driver also. Currently, the HiSax driver
  is the only voice-supporting driver. See
  <file:Documentation/isdn/README.audio> for more information.

CONFIG_ISDN_X25
  This feature provides the X.25 protocol over ISDN connections.
  See <file:Documentation/isdn/README.x25> for more information
  if you are thinking about using this.

CONFIG_ISDN_DIVERSION
  This option allows you to use some supplementary diversion
  services in conjunction with the HiSax driver on an EURO/DSS1
  line.

  Supported options are CD (call deflection), CFU (Call forward
  unconditional), CFB (Call forward when busy) and CFNR (call forward
  not reachable). Additionally the actual CFU, CFB and CFNR state may
  be interrogated.

  The use of CFU, CFB, CFNR and interrogation may be limited to some
  countries. The keypad protocol is still not implemented. CD should
  work in all countries if the service has been subscribed to.

  Please read the file <file:Documentation/isdn/README.diversion>.

CONFIG_ISDN_TTY_FAX
  If you say Y here, the modem-emulator will support a subset of the
  Fax Class 1 and 2 commands. Using a getty with fax-support
  (mgetty+sendfax, hylafax), you will be able to use your Linux box as
  an ISDN-fax-machine. This must be supported by the lowlevel driver
  also. See <file:Documentation/isdn/README.fax> for more information.

CONFIG_ISDN_DRV_LOOP
  This driver provides a virtual ISDN card. Its primary purpose is
  testing of linklevel features or configuration without getting
  charged by your service-provider for lots of phone calls.
  You need will need the loopctrl utility from the latest isdn4k-utils
  package to set up this driver.