AT commands (fax job) help

Here is the problem: i need to send out faxes in real time when an event occurs, actually i am using some code combined with XP fax service but the whole process is too slow. I am not sure but i think using AT commands and sending the fax directly through my Zyxel 2864I isnd modem could speed up the process. I need explanations how to convert a MSWord document (.doc) in fax format then how to send it thru the Zyxel. Probably i will also need a small program to automate the process.