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.
ISDN BRI interfacing into a PC is hard to do in the US... there are just not many (if any) cards available to do it. The few cards that are available only have firmware for Euro-ISDN, not NI-2 (and US BRI is _not_ the same as anywhere else in the world).
There are other options, though: Adtran (and others) make boxes that can cross-convert multiple BRIs into a PRI, which could then be connected to Asterisk via a T-1 card. Not an inexpensive way to go, though.
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