Samsung ProXpress M337 series User Manual page 307

Fax features
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Receiving faxes in memory
Since your machine is a multi-tasking device, it can receive faxes while you are
making copies or printing. If you receive a fax while you are copying or printing,
your machine stores incoming faxes in its memory. Then, as soon as you finish
copying or printing, the machine automatically prints the fax.
If fax is received and being printed, other copy and print jobs cannot be
processed at the same time.
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4. Special Features