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

[George Bean]

> -----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.

Regards,
George Bean
Puwaba Technologies