Network fax solution

Hi,

I am looking for a hardware or software solution that will enable a desktop PC to send and receive faxes over a LAN (ADSL Internet connection only).

No fax modem, no phone line.

Only need for 1 PC (W2K Pro PC joined to W2K domain), but may be used by up to 10 PCs in the future (prepared to pay for additional hardware/software/licenses later on).

Please let me know if you have any suggestions or require additional info.

Thank You,

D