Telephone utilities may contract with each other for the connection of their respective lines or systems and for the interchange through such connections of public telephone and communications service and for other proper purposes. A copy of every such contract shall be filed with the commission and provided to the Office of Regulatory Staff. Such contract shall remain in effect in accordance with its terms unless the commission, after notice and hearing, shall find that such contract is contrary to the public interest and shall disapprove it.
S.C. Code § 58-9-290