asterisk users - Dec 2004 - Astersik with ISDN up0

Hi,
 
I am new to the Asterisk world. I don't know much about the
architecture, but I am involved in installing and configuring the VoIP
system.
 
My requirement is to build a VoIP system using the 4 input lines (ISDN
up0 telephone lines), it must be possible to receive calls from outside
through the 4 ISDN up0 input lines, and also possible for outgoing
calls, conferencing .etc.
 
I couldn't find out exact place where I can get more information for my
specific question. If you have any idea or if you have experience please
let me know how to proceed.
 
I would like to know .
 
*  Is it possible to build a VoIP system using ISDN up0 telephone lines?
*  What are the hardware requirements?
 
 
Thanks
 
Kumaran
 
 
 
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On Tue, 14 Dec 2004, Kumaran Subramanian wrote:
> I would like to know .
>  
> *  Is it possible to build a VoIP system using ISDN up0 telephone lines?
I think you would normally use a NT device to get an S0 interface and 
connect that to the Asterisk box. In Europe the U interfaces are ususally 
not used directly.

I assume that there are NT devicce for Up0 to S0 conenction.
> *  What are the hardware requirements?
For four isdn BRIs you may want to look at the quadbri from junghanns:
  http://www.junghanns.net/asterisk/page17.html

Peter