asterisk users - Jan 2013 - Minimal pass-through T1 configuration?

Hi, all.  I'm upgrading my company's old 1.2 box with a 
new-and-improved one.  But a fair bit's changed in the interim.  To 
start, at least, I just want the new box to act as a pass-through for 
all calls -- PSTN calls go, unmodified, to the internal T1, and 
vice-versa.  (That way, I can begin to build a skeleton dialplan and 
work my way forward from there.)  But I'm bumping into problems:
     -- Executing [6000 at pstn:1] Dial("DAHDI/i1/6034941234-1", 
"DAHDI/G2/6000") in new stack
[Jan 21 12:19:35] WARNING[15163][C-00000000]: app_dial.c:2433 
dial_exec_full: Unable to create channel of type 'DAHDI' (cause 0 - 
Unknown)

So, a few questions:
1) What's the difference between chan_dahdi.conf and 
dahdi-channels.conf?
2) Could someone show me a SuperDumb(tm) minimal config for the 
necessary /etc/*dahdi*.conf and /etc/extensions.conf files?

Thanks!

-Ken

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