[Koha] printing barcodes

Hi, When creating and printing barcodes what symbology does Koha use? From what I can tell it looks like it is using either EAN-13 or UPC-A. In the User's Guide (4.3) it says it uses EAN-128, does Koha support EAN-128? The only success I have had is when the Number System (Country Code) is 0, followed by 11 digits, and when the check digit is automatically generated. When I use other country codes, like 978, what gets scanned doesn't match with whats in the items barcode data. Thank you, Kael