Epson WorkForce Pro WF-7820 All-in-One Inkjet Printer - Manual (Page 222)

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Setting Options Description
Fax Speed Fast(33,600bps) Sets the speed at which you send and receive faxes.
Medium(14,400bps)
Slow(9,600bps)
ECM On Turns on Error Correction Mode (ECM) to
automatically correct errors in sent or received fax
data.
Off Turns off Error Correction Mode (ECM); color faxes
cannot be sent or received.
Dial Tone Detection On Automatically dials the number you enter for faxing
when the product detects a dial tone.
Off Turns off automatic dial tone detection, which may
be necessary if the product is connected to a PBX
(Private Branch Exchange) or a TA (Terminal
Adapter). However, turning this setting off may cause
the product to drop the first digit of a fax number.
Line Type PSTN Selects a standard phone line (Public Switched
Telephone Network).
PBX Selects Private Branch Exchange, the type of phone
line used in office environments where an access
code such as 9 must be used to call an outside line.
Header Your Phone
Number Select to enter the header information and your
phone number for inclusion on outgoing faxes.
Fax Header
Receive Mode Manual Lets you confirm whether an incoming fax should be
printed; a telephone must be connected to the
product
Auto Automatically receives and prints faxes.