[Asterisk-Users] Verizon ISDN

[Brian G]

I'm looking to use Asterisk with Verizon ISDN centex service in the US. 
I'd be connecting to an NT1 so I'd need an S/T interface.  Users would
have SIP phones registered with Asterisk and sharing the ISDN lines.

The only PCI ISDN card that will support ISDN signalling in the US seems
to be the Eicon Diva Server cards.  These are hard to find and very
expensive ($2500 for the Quad card).  Its unclear to me looking at all
the posts if anyone has successfully used a cheaper PCI card in the US. 
Does anyone have this working and where did you get the card?

thanks,
Brian G.