Installing the bristuff drivers, etc

I’ve ran the bristuff’s install script (the one from Junghanns.net), and everything has installed fine.
However, the next step is to activate the zaptel module, right?
/etc/init.d/zaptel start says “Module zaptel not found”, as does modprobe zaptel.

Am I supposed to be activating zaptel in order for my ISDN BRI cards to be able to communicate with my ISDN line?