(1) An operator service provider, determining an allowable rate established in ARM 38.5.3403 will not permit adequate revenues, may apply to the commission for cost-based allowable rates. Operator service provider applications for cost-based allowable rates must be made in accordance with commission procedural and substantive rules pertaining to telecommunication rate case filings. The cost-based allowable rates established in the resulting proceeding will be specific to the applicant operator service provider, including if the record demonstrates that the cost-based allowable rates should be lower than the allowable rates established in accordance with ARM 38.5.3403.