Okla. Admin. Code § 165:55-7-3
The customer will be liable for charges incurred as a result of a premises visit by the telecommunications service provider for a trouble report caused by nonregulated customer provided equipment or inside wiring. The customer shall be advised of the potential for charges prior to the premises visit if the customer reports the trouble. If the telecommunications service provider finds the trouble through routine checks of its system, the customer will be notified of the charges before any work is done by the telecommunications service provider. The customer shall not be charged for a premises visit if the customer reports the trouble before the visit and is not advised before the visit of the potential for charges relating to the proposed visit by the telecommunications service provider.
Okla. Admin. Code § 165:55-7-3