ONPT was responsible of the introduction of Analog Mobile Radiotelephony in 1987. See https&colon;//www.apcointl.org and APCO radiotelephony spelling alphabet. Procedure words used in radiotelephony procedure, are a type of radio code. Several alphabets were used, before being superseded by the adoption of the NATO/ICAO radiotelephony alphabet. A phonetic example of that principle is the need for spelling alphabets in radiotelephony. Regarding the media, there is mail, telegraph, telephone, radiotelephony and radio and television signal. But several remain part of the standard ICAO radiotelephony phraseology in aviation. The licence allows a user to make radiotelegraphy and radiotelephony transmission in 13 frequency bands. An older term for this mode of communication is "radiotelephony". Suppressed-carrier ISB was employed in point-to-point (usually overseas) radiotelephony and radioteletype by shortwave (HF). Signals can be sent by flaghoist, signal lamp ("blinker"), flag semaphore, radiotelegraphy, and radiotelephony. For example, Portishead Radio, which was the world's busiest radiotelephony station, provided HF long-range services. Japan's first commercial radiotelephony service was launched by NTT in 1979. Such large radiotelephony stations employed large numbers of people and were expensive to operate. It is used in spoken word (radiotelephony), Morse code (radiotelegraphy), and in various digital modes.