CLLI CODE : PHNXAZMA07T

The Phoenix "Main" central office serves Qwest (NOW LUMEN) as the main regional tandem and AT&T for long distance and toll services. The office was originally built by Mountain States Telephone and Telegraph Company (later Mountain Bell) in the 1930s then added onto and modified by US West in the 1980s. Phoenix became an AT&T Long Lines microwave hub when TD-2 microwave service was introduced in the early 1960s. Phoenix was a sectional center in the hierarchy switching plan and had direct trunk groups to the Tucson primary and San Bernardino Regional centers. Phoenix was located on the Los Angeles-El Paso coax cable route and had direct connections to Blythe, Mesa and Tucson. AT&T introduced 4ESS service to the office in September of 1980. Today the CO has major fiber connections to Tucson, El Paso, Flagstaff, Las Vegas, San Diego and to Los Angeles