Zyxel elite 2864i and asterisk

I have a zyxel serial ISDN modem (with ta) and i´d like to use it to receive calls and use asterisk as the pbx to transfer call to softphones in my network, to keep voice messages, etc, etc. Can this be done? I dont know much about voip tech so i request all the help you guys can give me. thank you. :open_mouth: