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  2. Sound-powered telephone - Wikipedia

    en.wikipedia.org/wiki/Sound-powered_telephone

    A sound-powered telephone is a communication device that allows users to talk to each other with the use of a handset, similar to a conventional telephone, but without the use of external power. This technology has been used since at least 1944 [ 1 ] for both routine and emergency communication on ships to allow communication between key ...

  3. 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 ...

  4. Videotelephony - Wikipedia

    en.wikipedia.org/wiki/Videotelephony

    Audio output: usually loudspeakers associated with the display device or telephone; Data transfer: analog or digital telephone network, LAN, or Internet; Computer: a data processing unit that ties together the other components, does the compressing and decompressing, and initiates and maintains the data linkage via the network.

  5. VoIP phone - Wikipedia

    en.wikipedia.org/wiki/VoIP_phone

    Yealink Network Technology Co Ltd T27G VoIP Telephone Avaya IP phone. The overall hardware may look like a telephone or mobile phone. A VoIP phone has the following hardware components An handset with a headphone and a microphone, unless the whole telephone is a hand-held device containing these; A loudspeaker to act as a speakerphone

  6. Softphone - Wikipedia

    en.wikipedia.org/wiki/Softphone

    A softphone is a software program for making telephone calls over the Internet using a general purpose computer rather than dedicated hardware. The softphone can be installed on a piece of equipment such as a desktop, mobile device, or other computer and allows the user to place and receive calls without requiring an actual telephone set. [1]

  7. 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 .

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