 546 promulgated on July 23, 1979, and conferred with regulatory and quasi-judicial functions taken over from the Board of Communications and the Telecommunications Control Bureau, which were abolished in the same Order.Primarily, the NTC is the sole body that exercises jurisdiction over the supervision, adjudication and control over all telecommunications services throughout the country.For the effective enforcement of this responsibility, it adopts and promotes such guidelines, rules, and regulations relative to the establishment operation and maintenance of various telecommunications facilities and services nationwide.