What is the difference between Auto and manual answer?

• Auto Answer is a built–in feature that will allow the product to receive an incoming fax automatically. With Auto Answer enabled, the product should receive faxes without user intervention. If Auto Answer is not enabled, the product will never answer the fax call.
  
  NOTE: If you are able to send a fax but are unable to receive one, Auto Answer may be disabled.
  
  To receive faxes manually, turn off the Auto Answer feature to enable manual answer mode. User intervention is required to answer faxes in this mode:
  1. When the connected telephone rings, answer the call. You see this message on your product's LCD screen:
     
  2. If you hear a fax tone, select the Receive option and press the OK button.
     
     Note: Leave the answered call active as you receive the fax transmission.
  3. Follow the instructions on the screen to receive the fax. When fax transmission is finished, you see the previous LCD screen.
  4. Press the OK button to print the fax.
  5. Hang up the phone.
  Related References
  Receiving Faxes