Century Telephone Enterprises Inc has satisfied Standard & Poor’s Corp that its present triple-B rating on its $115m of senior unsecured debt is justified. The ratings agency also assigned a preliminary triple-B-plus rating to its $400m debt securities filed under a Rule 415 shelf registration, adding that the outlook is stable. The ratings reflect the financial and operating stability of the company’s core telephone operations, somewhat offset by the higher risk profile of its cellular telephone businesses, the agency noted.