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  2. Conference call - Wikipedia

    en.wikipedia.org/wiki/Conference_call

    Companies commonly use a specialized service provider who maintains the conference bridge, or who provides the phone numbers and PIN codes that participants dial to access the meeting or conference call. These service providers can often dial-out to participants, connecting them to call and introducing them to the parties who are on-the-line.

  3. Videotelephony - Wikipedia

    en.wikipedia.org/wiki/Videotelephony

    Videotelephony (also known as videoconferencing or video calling) is the use of audio and video for simultaneous two-way communication. [1] Today, videotelephony is widespread. There are many terms to refer to videotelephony. Videophones are standalone devices for video calling (compare Telephone).

  4. Call-progress tone - Wikipedia

    en.wikipedia.org/wiki/Call-progress_tone

    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 and busy tone. The ITU-T E.180 and E.182 recommendations define the technical characteristics and intended usage of some of ...

  5. Comparison of web conferencing software - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_web...

    Unified Communications (UC) is a marketing buzzword describing the integration of real-time, enterprise, communication services such as instant messaging (chat), presence information, voice (including IP telephony), mobility features (including extension mobility and single number reach), audio, web & video conferencing, fixed-mobile ...

  6. Teleconference - Wikipedia

    en.wikipedia.org/wiki/Teleconference

    Terms such as audio conferencing, telephone conferencing, and phone conferencing are also sometimes used to refer to teleconferencing. The communications system may support the teleconference by providing one or more of the following: audio , video , and/or data services by one or more means, such as telephone , computer , telegraph ...

  7. Called party - Wikipedia

    en.wikipedia.org/wiki/Called_party

    The called party (in some contexts called the "B-Number") is a person who (or device that) answers a telephone call. The person who (or device that) initiates a telephone call is the calling party. [1] In some situations, the called party may number more than one. Such an instance is known as a conference call. In some systems, only one called ...

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