I have used the ISC card for some time now and I'm very happy with the overall quality of the card and its performance. I am currently testing it with TCP/IP and Novell IPX connecting to our Gandalf PRI equipment. Check out ISC's homepage and USR's homepage for more information on their products. I have heard un-confirmed reports that you can get the card for ~$350.
ISC has a few things that make this card unique:
Hardware:
It is an internal card with a built-in NT1
It has the ability of automatically
disconnecting/connecting DATA service when you pickup the analog phone
It supports Stac 4:1, Ascend 4:1, and Microsoft
data compression
It supports PPP / ML-PPP connectivity with Bandwidth
on Demand
Software:
It supports the network stacks: ODI / NDIS /
PKT / and WinISDN
It supports both PAP and CHAP network
authentication
It supports the IPCP/BNCP bridge protocol
for supporting multiple users behind a single ISC ISDN card
It supports full IP and IPX source routing
It supports the NetBIOS/NetBEAUI protocol
ML-PPP: Accessworks, Ascend, DigiBoard,
Gandalf, and KNX
PPP: Accessworks, Ascend, DigiBoard, Gandalf,
KNX, Microsoft, and Motorola