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T.37 is an ITU standard which deals with sending fax messages using email. It is also referred to as "iFax", "Internet Fax", or "Store-forward-fax".
A fax machine supporting T.37 will send a fax to an email address by converting the document to a PDF or TIFF image, attaching it to an email (using the MIME format), and sending the document (using SMTP). The destination fax receives the email and prints the attached document.
To interface with regular fax machines:
T.37 can be used in conjunction with fax gateways to communicate with regular fax machines. The fax gateway converts emails to regular faxes, or regular faxes to emails.
A T.37-compliant fax machine includes legacy fax functionality to send to regular fax numbers, and requires a phone line for this.
To find the destination faxes email address, a standard is in development which allows a destination fax number to be used to lookup the destination email address *
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See also
T.38 (Fax over the Internet Protocol)
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