[Asterisk-Dev] best approach for a new isdn driver mainly for asterisk.. ?!

[Steven Critchfield]

On Mon, 2003-04-28 at 18:41, George Bean wrote:
> > -----Original Message-----
> > From: asterisk-dev-admin at lists.digium.com [mailto:asterisk-dev-
> > admin at lists.digium.com] On Behalf Of Steve Brown
> > Sent: Monday, April 28, 2003 11:31 AM
> > To: asterisk-dev at lists.digium.com
> > Subject: Re: [Asterisk-Dev] best approach for a new isdn driver mainly
> for
> > asterisk.. ?!
> > 
> > And
> > lastly, if you want to do this on a budget, used channel banks and bri
> > cards are pretty cheap. I recently bought a Premisys cb and six 8 port
> > bri-u cards on ebay and haven't yet spent $200.
> > 
> 
> Are you sure the BRI ports on those channel bank cards have an aggregate
> D channels on a single time slot of the attached T1? Most American made
> BRI cards are for the BRITE system that is used to transport ISDN
> circuits from a switch site to a distant point, closer to the customer
> termination. They put D channels from 1-4 ISDN circuits on a T1 time
> slot and thus use multiple time slots for D channel information.
> Asterisk can only handle D channel information on a T1 when it is in the
> form of a PRI with a single aggregate D channel.

Check the archives, we have discussed the signalling before. If you also
go back in the thread, you will find that it is more likely that we can
get ISDN over T1 working than get network side signalling on a passive
card.
-- 
Steven Critchfield <critch at basesys.com>