(a) Except as otherwise provided in paragraphs (b) through (e) of this section, or by Commission order, carriers that are nondominant in the provision of international and interstate, domestic interexchange services shall not file tariffs for such services. (b) Carriers that are nondominant in the provision of international and domestic, interstate, interexchange services are permitted to file tariffs for dial-around 1+ services. For the purposes of this paragraph, dial-around 1+ calls are those