isdn equipment and cost

[glorifiedg790]

I live in the sticks where dsl and cable is not available. I have heard you need to convert an analog phone line into digital in order to use isdn. I have researched online and it has left me even more confused. I know I will need an ISDN modem, and an isp but what is the price of having a digital line, or is it possible to have ISDN over normal phone line? My phone service is verizon. I know isp.com offers 64k isdn. So what do I do? how do I get isdn? And what do I need?