On Mon, 2005-03-28 at 12:48 -0700, Kevin P. Fleming wrote: > Brian G wrote: > > 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.
I looked at the Adit cards for that, and didn't see it as a simple conversion. The ADIT cards support putting the 2b+1d into 3 B channels on a T1. Then you have to deal with the signaling for the D channel speed differences. In BRI the D channel is 16k and the B channel it gets stuck into on PRI is 64k. There was another method of encoding that allowed multiple D channels to be combined into a B channel to get better density, but again, it wasn't a direct fit with the zapata libraries and didn't look easy to do. Does the Adtran way differ significantly enough to make this become easy? -- Steven Critchfield <[EMAIL PROTECTED]> _______________________________________________ Asterisk-Users mailing list [email protected] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
