Panasonic KX-T336

What is the best way to integrate a Panasonic KX-T336 with Asterisk? (Is this even possible?) What cards would I need to purchase (both for the Panasonic and for Asterisk)? How hard is this to integrate? Any help is appreciated.

I’d use the T1 card interface on the Panasonic side and a T1 card (Digium) on the Asterisk side. That’ll give you the least hassle.