where are asterisk modules ?

[whollygoat@letterboxes.org]

I've installed asterisk on lenny, along with zaptel and libpri.  I'm
working throught the O'Reilly Asterisk book.  Things are going well
untill I try a command that needs /dev/zap/ctl.  The device isn't there.
Apparently I need some modules, but they don't seem to be there. 

Specifically, I'm looking for wctdm and zaptel.  Modprobe couldn't find
them, so I did a "find /lib -iname '*wctdm*'" and then even a "find /
-iname '*wctdm*'". Neither returned anything.

Googling hasn't turned up anybody having had the same missing modules
problem.  

So does anybody know how I go about getting the asterisk modules on my
system?

Thanks,

will
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  whollygoat@letterboxes.org

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