(1) All interexchange carriers must maintain tariffs on file with the commission that have been approved by the commission. The tariffs must include "maximum allowable rates" and terms, conditions and descriptions of all intrastate regulated telecommunications services offered by the interexchange carrier in Montana. The "maximum allowable rate" which shall be listed in the tariff for each service, is the maximum rate which can be charged pursuant to a price list filed pursuant to ARM 38.5.3707.

(2) Tariffs can only be changed by commission order, following the applicable notice and procedural requirements of Title 69, MCA, and the Montana Administrative Procedure Act, Title 2, chapter 4, MCA.

(3) Tariffs must be filed and maintained as "schedules"

in � 69-3-301 , MCA.