Comment by efreak

You can do the reverse, too. Hook up a dial-up modem to your PC and you can send and receive faxes on it. The software is built-in, though you'll probably want to configure it not to receive faxes automatically on your landline unless it's dedicated for that purpose. This has been built into Windows since at least Windows xp, probably been possible since 3.x. There's also Linux and probably Mac software available too. In Windows 11, I think the fax program isn't installed by default anymore, you might have to add it via optionalfeatures.exe.