Contributed by Hellmuth Michaelis
<hm@FreeBSD.ORG>.
This section is really only relevant to ISDN users in countries where the DSS1/Q.931 ISDN standard is supported.
Some growing number of PC ISDN cards are supported under FreeBSD 2.2.x and up by the isdn4bsd driver package. It is still under development but the reports show that it is successfully used all over Europe.
The latest isdn4bsd version is available from ftp://isdn4bsd@ftp.consol.de/pub The main isdn4bsd ftp site (You have to log in as user isdn4bsd , give your mail address as the password and change to the "pub" directory. Anonymous ftp as user "ftp" or "anonymous" will NOT (!) give the desired result ! ).
Isdn4bsd allows you to connect to other ISDN routers using either IP over raw HDLC or by using synchronous PPP. A telephone answering machine application is also available.
Many ISDN PC cards are supported, mostly the ones with a Siemens ISDN chipset (ISAC/HSCX), support for other chipsets (from Motorola, Cologne Chip Designs) is currently under development. For an up-to-date list of supported cards, please have a look at the README file.
In case you are interested in adding support for a different ISDN protocol, a currently unsupported ISDN PC card or otherwise enhancing isdn4bsd, please get in touch with hm@kts.org.
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