>I also need a copy of the NI-1 specs; pointers to that would be helpful
>too. I don't even know which document I need... is it TR-NWT-000776 from
>Telcordia?

I was told (when I inquired about this a couple of years ago, in a
different context) that having the NI-1 spec isn't quite enough.  What
you really need is access to the source code that runs on the switch so
you can figure out what all the undocumented extensions are :-(  I
gather this is especially true for things like the so-called 5ESS
protocols.  From what I understand, there are only a few people who
write US-compatible ISDN stacks and most companies buy one of these
stacks.

This was told to me by someone who had helped author ISDN specifications,
so I treated it as reliable.  However, don't let that stop you :-)

--Ken