All tariffs and terms and conditions of service heretofore filed or submitted by a telecommunications service provider and approved or deemed approved by the Commission are not revoked, altered or amended by this Chapter, except to the extent they are in direct conflict with any provision of this Chapter, in which event such tariffs and terms and conditions of service are superseded by this Chapter to the extent of conflict only.
Okla. Admin. Code § 165:55-1-13