What exactly does ECM (Error Correction Mode) do?
ECM sends information and allows the fax machine which is transmitting to communicate with the receiving fax so that it knows know if bits of data have corrupted. Loss of information can happen on noisy telephone lines, as well as VoIP transmissions. When receiving information that some bits of information have been lost or corrupted the fax machine will retransmit the corrupted or lost bits, which ensures a high quality document.
