Fax Software

Hello
I access the internet through LAN and i have cablenet. I need a fax software which can act as a server on a system which is a client in a network. Can anyone suggest me any FAX Software which can do not depend on any FAX modem as i havedownloaded almost all the softwares but they are asking me for a FAX modem but i connect to the internet through LAN.
Any Idea about a software which can work on lan????

Regards.