(1) Classes of service. The classes of service are business and residential. Each local exchange company (LEC) must file with the commission, as part of its tariff a description of the classes and types of service available to customers in each class. LECs must record for each access line whether local exchange service is residential or business class.

(2) Types of service. LECs must offer, at a minimum, flat-rate local exchange service. In addition, companies may offer service alternatives, such as measured service.

(3) Grade of service. Local exchange service offered by companies must be only one-party service.