Support of ISDN Subsystem under Freebsd 6.x/7.x - amd64

[Hans Petter Selasky]

Hi,

> Maybe we should continue this discussion after Christmas?

I have been thinking a little bit and I believe that ISDN4BSD will become more 
IP-based in the future. ISDN4BSD already puts all data into so called "mbufs" 
which are used to hold IP-packets. Internally ISDN4BSD could possibly use the 
IP stack when briding a call, because then it will become possible that the 
sound can be routed directly to the physical piece of hardware that is 
handling a call, instead of routing everything into userland, through 
Asterisk for example, and then back again into the kernel. Of course this 
might mean that we have to put some voice codecs into the kernel, but I think 
that support for A-law and u-law will be sufficent for a while.

Maybe each ISDN adapter should allocate a network adapter for itself and then 
feed all D-channel and B-channel data into the kernel through IPv4 or IPv6 
UDP frames to a programable IP-address. Then if you have a firewall loaded in 
the kernel, routing those IP-packets somewhere else can be a piece of cake. 
This also brings up some interesting questions like that the DSS1 protocol 
becomes a UDP client in the kernel. Then you can actually run the DSS1 
protocol on a different machine than the one where the ISDN cable is 
physically connected.

Any comments ?

--HPS