CTI provides for vendors to send invoices via:
- e-Invoice – a electronic invoice file that only has invoice data with no image in a defined EDI format
- paper – an invoice mailed through the US postal service in an envelope
- email – an electronic invoice image (i.e. PDF) sent as an email attachment
- fax – an invoice that is sent to a dedicated fax server that becomes an image directly from the fax
Invoices coming through in paper, email or fax will need to go through the ICE processing to extract the invoice data. Invoices coming through e-Invoicing are already in an electronic data format and do not need to go through ICE processing.