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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. DTMF - Wikipedia

    en.wikipedia.org/wiki/DTMF

    Touch-tone dialing with a telephone keypad gradually replaced the use of rotary dials and has become the industry standard in telephony to control automated equipment and signal user intent. [3] Other multi-frequency systems are also used for signaling on trunks in the telephone network.

  4. Touch-Tone Telephone - Wikipedia

    en.wikipedia.org/wiki/Touch-Tone_Telephone

    "Touch-Tone Telephone" is a song by Lemon Demon, a musical project created by American musician Neil Cicierega. It was released on February 29, 2016, as the second track of Lemon Demon's seventh studio album, Spirit Phone , and as a wax cylinder single on May 23, 2023.

  5. 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 ...

  6. Trimline telephone - Wikipedia

    en.wikipedia.org/wiki/Trimline_telephone

    A 220 Trimline rotary desk phone, showing the innovative rotary dial with moving fingerstop Early Touch Tone Trimline with round buttons and clear plastic backplate and round non-modular handset cord Redesigned touch-tone desk model Trimline, manufactured on January 9, 1985 The Trimline 2225, one of the last phones made at the Indianapolis Works in 1986 Early foreign made Trimline, December ...

  7. Princess telephone - Wikipedia

    en.wikipedia.org/wiki/Princess_telephone

    The rotary dial version with ringer was known as the 702B, while the modular cord variant was labeled 702BM. The model 711B had a slide switch or push-button and was a two-line phone with exclusion on the first line. The ten-button Touch Tone version was known as the 1702B, and when twelve-button keypad were introduced the phone was labeled as ...

  8. Telephone - Wikipedia

    en.wikipedia.org/wiki/Telephone

    A telephone, colloquially ... A breakthrough new technology was the introduction of Touch-Tone signaling using push-button telephones by American Telephone ...

  9. Multi-frequency signaling - Wikipedia

    en.wikipedia.org/wiki/Multi-frequency_signaling

    Multifrequency signaling is a technological precursor of dual-tone multi-frequency signaling (DTMF, Touch-Tone), which uses the same fundamental principle, but was used primarily for signaling address information and control signals from a user's telephone to the wire-center's Class-5 switch. DTMF uses a total of eight frequencies.

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