Installing the bristuff drivers, etc

I’ve ran the bristuff’s install script (the one from, 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?