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  2. Business telephone system - Wikipedia

    en.wikipedia.org/wiki/Business_telephone_system

    A business telephone system is a telephone system typically used in business environments, encompassing the range of technology from the key telephone system ( KTS) to the private branch exchange ( PBX ). A business telephone system differs from an installation of several telephones with multiple central office (CO) lines in that the CO lines ...

  3. VoIP phone - Wikipedia

    en.wikipedia.org/wiki/VoIP_phone

    A VoIP phone or IP phone uses voice over IP technologies for placing and transmitting telephone calls over an IP network, such as the Internet. [ 1] This is in contrast to a standard phone which uses the traditional public switched telephone network (PSTN). Digital IP-based telephone service uses control protocols such as the Session Initiation ...

  4. Avaya - Wikipedia

    en.wikipedia.org/wiki/Avaya

    Footnotes / references. [ 1][ 2] Avaya office. Avaya LLC, often shortened to Avaya ( / əˈvaɪ.ə /) and formerly Avaya Inc., is an American multinational technology company headquartered in Morristown, New Jersey, [ 3] that provides cloud communications and workstream collaboration services. The company's platform includes unified ...

  5. List of Nokia products - Wikipedia

    en.wikipedia.org/wiki/List_of_Nokia_products

    The phone has exactly the same design as the 7250. This phone is far more popular than the 7250 and has been made available on pre-paid packages and therefore it is very popular amongst youths in the UK and other European countries. The 7510 Supernova was a phone exclusive to T-Mobile USA. Only some units of this model have Wi-Fi chips with UMA.

  6. Voice over IP - Wikipedia

    en.wikipedia.org/wiki/Voice_over_IP

    Voice over Internet Protocol ( VoIP ), [ a] also called IP telephony, is a method and group of technologies for voice calls for the delivery of voice communication sessions over Internet Protocol (IP) networks, [ 2] such as the Internet. The broader terms Internet telephony, broadband telephony, and broadband phone service specifically refer to ...

  7. List of United States telephone companies - Wikipedia

    en.wikipedia.org/wiki/List_of_United_States...

    Telephone and Data Systems, (through its subsidiary TDS) serves mainly rural areas in parts of 36 states. [3] Altafiber, which serves the greater Cincinnati area, and Hawaii due to its acquisition of Hawaiian Telcom [4] was not included in the Bell System breakup of 1984 because the former AT&T held only a minority stake in that company.

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