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  2. Telecommunications device for the deaf - Wikipedia

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

    The printer records the conversation. 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.

  3. Telecommunications relay service - Wikipedia

    en.wikipedia.org/wiki/Telecommunications_relay...

    A typical relay service conversation. A telecommunications relay service, also known as TRS, relay service, or IP-relay, or Web-based relay service, is an operator service that allows people who are deaf, hard of hearing, deafblind, or have a speech disorder to place calls to standard telephone users via a keyboard or assistive device.

  4. Hush-A-Phone - Wikipedia

    en.wikipedia.org/wiki/Hush-A-Phone

    Hush-A-Phone attached to a candlestick telephone on display at Museum of Communications in Seattle. The Hush-A-Phone was a device designed to attach to the transmitter of a telephone to reduce noise pollution and increase privacy. Sold by the Hush-A-Phone company, the device was frequently described in its commercial advertisements as "a voice ...

  5. Portal:Telephones - Wikipedia

    en.wikipedia.org/wiki/Portal:Telephones

    A payphone (alternative spelling: pay phone or pay telephone or public phone) is typically a coin-operated public telephone, often located in a telephone booth or in high-traffic public areas. Prepayment is required by inserting coins or telephone tokens , swiping a credit or debit card, or using a telephone card .

  6. Beige box (phreaking) - Wikipedia

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

    Beige boxes can be usually constructed with easily available materials, such as a simple "POTS" telephone, a soldering iron, and a pair of alligator clips.Sometimes a switch is added in order to turn the microphone off (mute), so as not to introduce ambient noise into the line through the telephone's microphone.

  7. Cordless telephone - Wikipedia

    en.wikipedia.org/wiki/Cordless_telephone

    Full supervision of all telephone functions, including on-off hook and dialing was provided via an out of band tone supervision system. The model developed for home use was designed to look like a standard (although bulky) telephone handset. The base station was a small box connected to a standard telephone network.

  8. Telephone - Wikipedia

    en.wikipedia.org/wiki/Telephone

    An old rotary dial telephone AT&T push button telephone made by Western Electric, model 2500 DMG black, 1980. A telephone, colloquially referred to as a phone, is a telecommunications device that enables two or more users to conduct a conversation when they are too far apart to be easily heard directly.

  9. Speakerphone - Wikipedia

    en.wikipedia.org/wiki/Speakerphone

    A speakerphone is a telephone with a microphone and loudspeaker provided separately from those in the handset. [1] This device allows multiple persons to participate in a conversation. The loudspeaker broadcasts the voice or voices of those on the other end of the telephone line, while the microphone captures all voices of those using the ...

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