[Asterisk-Users] ISDN & ASTERISK Cabling...

[Alainn]

Hiya!

I have a question about how to cable my asterisk together in Germany.  
Here is the setup:

1)  Anlage anschluss  (pbx line - 4 isdn lines bundled together)
2)  These are delivered via 4 NTBAs
3)  In my computer, I have asterisk and an AVM C4 card
4)  I need to connect 8 isdn phones

to connect the NTBAs to the computer - no problem.  However, what would 
I need in order to connect asterisk to ISDN phones within the office?

I need not ask that we are operating on a shoestring...

thanks!

Álainn