Canon MultiPASS MP390 - Receive Modes; If You Want To Receive Faxes Automatically As Well As Voice Calls:; If You Want To Receive Only Faxes Automatically With Your Machine, Or You Have A Dedicated Telephone Line For Fax Use Only:

Chapter 10 Sending Faxes 103
Sending/Receiving Using ECM
This machine is set to send/receive faxes in ECM (Error Correction Mode). Checking the sending
and receiving condition at the sending end and the receiving end respectively, ECM automatically
corrects errors caused by telephone line trouble.
NOTE
• If the sender's or receiver’s fax is not ECM-compatible, the fax will be sent/received in the standard mode.
• You can also disable ECM sending/receiving. (See page 154, page 155)
6 Hang up the handset.