Section 1220-04-02-.38 - DIRECT DISTANCE DIAL SERVICE(1) Engineering and maintenance of the trunk and related switching components in the internal network shall be such as to permit attaining the following objective on properly dialed calls, during the average busy season without encountering blockages or equipment irregularities.(2) DDD Calls by customer (incoming trunks) - ninety-eight percent (98%).(3) Surveillance Level - ninety-six percent (96%).Tenn. Comp. R. & Regs. 1220-04-02-.38
Original rule filed February 2, 1976; effective March 3, 1976.Authority: T.C.A. § 65-2-102.