It would be nice if we could just drop in any board out there and use it, but we need updated TAPI and WAV drivers from the board vendors for these cards to work properly in Unity.
Currently there are no plans for the D42NS card to get updated drivers.
I can tell you that Dialogic is coming out with the JCT line and the D42JCT is supposed to have functionality for a digital integration with the Norstar... of course I can't say for sure if it'll work or when it'll be available, but it is on the radar.
Jeff Lindborg
Unity Product Architect
Active Voice Corp
jlindborg@activevoice.com