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  2. Push-button telephone - Wikipedia

    en.wikipedia.org/wiki/Push-button_telephone

    A push-button telephone is a telephone that has buttons or keys for dialing a telephone number, in contrast to a rotary dial used in earlier telephones.. Western Electric experimented as early as 1941 with methods of using mechanically activated reeds to produce two tones for each of the ten digits and by the late 1940s such technology was field-tested in a No. 5 Crossbar switching system in ...

  3. Model 500 telephone - Wikipedia

    en.wikipedia.org/wiki/Model_500_telephone

    In the 1960s, after the introduction of touch-tone service in November 1963 in various locations of the telephone network, the basic 500-type chassis was retrofitted with a new housing and face plate, and a ten-key push-button keypad. This was designated as the model 1500 telephone, and a twelve-button model 2500 was introduced in 1968.

  4. Things Boomers Took for Granted That are Obsolete Now

    www.aol.com/things-boomers-took-granted-obsolete...

    Although Bell developed a primitive version in 1950, it took until 1975 for push button phones to make an impact. Tone-enabled features like call waiting and three-way calling signalled the ...

  5. Portal:Telephones - Wikipedia

    en.wikipedia.org/wiki/Portal:Telephones

    DTMF was first developed in the Bell System in the United States, and became known under the trademark Touch-Tone for use in push-button telephones supplied to telephone customers, starting in 1963. DTMF is standardized as ITU-T Recommendation Q.23.

  6. Portal:Telephones/Selected audio - Wikipedia

    en.wikipedia.org/wiki/Portal:Telephones/Selected...

    A dial tone (dialling tone in the UK) is a telephony signal sent by a telephone exchange or private branch exchange (PBX) to a terminating device, such as a telephone, when an off-hook condition is detected. It indicates that the exchange is working and is ready to initiate a telephone call. The tone stops when the first dialed digit is recognized.

  7. Telephone keypad - Wikipedia

    en.wikipedia.org/wiki/Telephone_keypad

    A telephone keypad is a keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number. It was standardized when the dual-tone multi-frequency signaling (DTMF) system was developed in the Bell System in the United States in the 1960s – this replaced rotary dialing , that had been developed for ...

  8. Pulse dialing - Wikipedia

    en.wikipedia.org/wiki/Pulse_dialing

    However, the technology of using mechanical reed relays was too unreliable until transistors transformed the industry. In 1963, the Bell System introduced to the public dual-tone multi-frequency (DTMF) technology under the name Touch-Tone, which was a trademark in the U.S. until 1984. [7] The Touch-Tone system used push-button telephones. In ...

  9. Signal tone - Wikipedia

    en.wikipedia.org/wiki/Signal_tone

    Certain telephone switching systems used tones, in-band or out-of-band, for signaling on trunks. Typical well-known call progress tones are dial tone, ringing tone, busy tone, and the reorder tone. [1] A loud stutter tone is used to alert subscribers of a handset left off-hook, effectively disabling the circuit for receiving calls.