Documentation on writing a custom socket

Luigi Rizzo rizzo at
Sun Mar 9 09:42:41 UTC 2008

On Sun, Mar 09, 2008 at 10:17:14AM +0100, Hans Petter Selasky wrote:
> On Saturday 08 March 2008, Max Laier wrote:
> > Am Sa, 8.03.2008, 11:33, schrieb Hans Petter Selasky:
> > > I'm planning to create a new socket type in FreeBSD called AF_Q921, which
> > > is
> > > to be used for ISDN telephony. Where do I find documentation on how to
> >
> > interesting ... can you share more information on this project?
> Hi Max,
> I'm currently working on some redesign of my ISDN4BSD stack in cooperation 
> with the FreeSwitch project. One of things that I want to do is to have all 
> ISDN adapters appear like network devices. The ISDN protocols usually use 
> something called Q.921 which is similar to TCP, only very simplified.

funny, I thought that the word "simplified" and an ITU specification
were incompatible concepts :)

(for the records, the Q.921 spec is available online from ITU!!PDF-E&type=items


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