Set the printer's telephone line type to pulse dialing.
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Press the button on the printer.
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Use the buttons to select Setup.
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Press the OK button.
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Select Device settings, then press the OK button.
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Select FAX settings, then press the OK button.
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Select FAX user settings, then press the OK button.
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Select Telephone line type, then press the OK button.
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Select Rotary pulse, then press the OK button.