Cisco CCM > Asterisk > PSTN

I have my Cisco CCM to asterisk configured working and tested I have my asterisk to PSTn working and tested. How do I make it so my CCM can call straight through my asterisk and out the PSTN. Inbound dial rules only seemed to be able to point to an extension. I know it must be possible but google isnt returning much.

Thanks for the help,

Chad