Install asterisk 1.8 to rt-n16 with tomato firmware

Hi, I am really new to asterisk, so my question may not make sense.

I own a rt-n16 and i flashed it to the latest tomato usb TB mod. I am wondering if it is possible to run asterisk in this router, and then connect a pap2 device to my regular phone.

any instructions for this particular setup? Thanks!