Recommendation for Fax for IP Lease Line

I am currently looking for a fax system that I can set up for my company. I was wondering if anyone can recommend me some hardware and software for the fax system (preferably with good support, not too high in cost and one that I can built on my present server system).

I am currently using Exchange Server 5.5 and Outlook 98. And the company’s WAN is connected to the Internet using an IP Lease Line.

Thanks in advanced for you help.