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2. Telephone keypad - Wikipedia

   en.wikipedia.org/wiki/Telephone_keypad

   A telephone keypad using the ITU E.161 standard. 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 ...

3. Google Voice - Wikipedia

   en.wikipedia.org/wiki/Google_Voice

   Google Voice currently provides free PC-to-phone calling within the United States and Canada, and PC-to-PC voice and video calling worldwide between users of the Google+ Hangouts browser plugin (available for Windows, Intel-based Mac OS X, and Linux). [ 5] Almost all domestic and outbound calls to the United States (including Alaska and Hawaii ...

4. Phreaking - Wikipedia

   en.wikipedia.org/wiki/Phreaking

   Phreaking is a slang term coined to describe the activity of a culture of people who study, experiment with, or explore telecommunication systems, such as equipment and systems connected to public telephone networks. [ 1 ] The term phreak is a sensational spelling of the word freak with the ph- from phone, and may also refer to the use of ...

5. Red box (phreaking) - Wikipedia

   en.wikipedia.org/wiki/Red_box_(phreaking)

   Red box (phreaking) A red box is a phreaking device that generates tones to simulate inserting coins in pay phones, thus fooling the system into completing free calls. In the United States, a nickel is represented by one tone, a dime by two, and a quarter by a set of five. Any device capable of playing back recorded sounds can potentially be ...

6. Telecommunications device for the deaf - Wikipedia

   en.wikipedia.org/wiki/Telecommunications_device...

   The specific GA and SK keys allow for speedier use of common abbreviations. A telecommunications device for the deaf ( TDD) is a teleprinter, an electronic device for text communication over a telephone line, that is designed for use by persons with hearing or speech difficulties. Other names for the device include teletypewriter ( TTY ...

7. Call-progress tone - Wikipedia

   en.wikipedia.org/wiki/Call-progress_tone

   In telephony, call progress tones are audible tones that provide an indication of the status of a telephone call to the user. The tones are generated by a central office or a private branch exchange (PBX) to the calling party . Telecommunication equipment such as fax machines and modems are designed to recognize certain tones, such as dial tone ...