Subject: Re: ISDN
To: David Jones <>
From: Hellmuth Michaelis <>
List: current-users
Date: 07/03/1995 09:27:32
>From the keyboard of David Jones:

> Is there any sort of standard interface for ISDN?

Yes, at least here in Europe. One is CAPI, the other has been proposed by
France Telecom (?), and i've forgotten the name ...

CAPI is the defacto standard for talking to ISDN hardware in Germany, almost
every manufacturer of ISDN boards has a CAPI driver (for DOS) available. Specs
for implementing CAPI exists for DOS/Windows/Unix, unfortunately the Unix
specs seem to require STREAMS. For more info see comp.dcom.isdn and Dan Kegel's
(sp ?) ISDN www pages.

> Such an interface would permit:
> - processes to set up/tear down calls

Handled by CAPI.

> - routing of network protocols (e.g. inet) over ISDN

This is not the duty of an ISDN handling protocol spec. After you have set up
a connection using CAPI, you are free to put in anything into the ISDN packets
what you like - even IP packets ! :-)

A very popular way of connecting to the internet over here is to get a cheap
PC, put in a cheap ISDN board with a CAPI driver, put a packet driver to CAPI
converter on top of that, and use a ethernet packetdriver and some sort of
routing software (i.e. pcroute). It just tunnels IP packets through ISDN.

Hellmuth Michaelis        GFKT HCS Computertechnik GmbH        Hamburg, Europe
  Unplug cables at least semi-annually to allow unused bits to drain. (HP RAQ)