The Commission adopted a Report and Order which requires that incumbent local exchange carriers (LECs) use the Common Carrier Bureau's (Bureau) Electronic Tariff Filing System (ETFS) to officially file tariffs and associated documents. The Order amends the Commission's tariff filing rules to accommodate mandatory electronic filing. This Order applies the mandatory electronic filing requirement to incumbent LECs only. However, ETFS also enables interested parties to access and download these documents over the Internet, and to file petitions to reject, or suspend and investigate tariff filings electronically.