The short answer is that no, you cannot.
Faxing requires a telephone line.
While it is possible to fax through the internet, it would require a VOIP device and a subscription service (such as through vonage, ooma, etc).
You cannot fax directly through wifi, some type of phone line would still be required.
There are some "efax" options available as well (also require a monthly fee), where you scan an item and upload to a site then enter the number to fax it to. Received faxes (they provide a dedicated number to you) are emailed to you.
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