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Ultimately - in order to communicate with a fax machine, you will need to use a dial up modem. Since fax machines do not connect to the internet or use IP they must be dialed to.
Places like efax probably have a bank of modems, and they get your fax via the software, and send it out to fax machines with their modems.
Since fax machines do not connect to the internet, I don't see how there could be software written to send faxes through cable to fax machines.
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