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  2. 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 ...

  3. Skype - Wikipedia

    en.wikipedia.org/wiki/Skype

    It also has instant messaging, file transfer, debit-based calls to landline and mobile telephones (over traditional telephone networks), and other features. It is available on various desktop, mobile, and video game console platforms. Skype was created by Niklas Zennström, Janus Friis, and four Estonian developers, and first released in August ...

  4. Google Duo - Wikipedia

    en.wikipedia.org/wiki/Google_Duo

    Google Duo was a proprietary voice over IP (VoIP) and videotelephony service released in 2016 by Google and merged into its Google Meet product in 2022. It was available for Android, IOS and web browsers. It let users make and receive one-to-one and group audio and video calls with other Duo users in high definition, using end-to-end encryption by

  5. Videotelephony - Wikipedia

    en.wikipedia.org/wiki/Videotelephony

    Videotelephony (also known as videoconferencing or video call) is the use of audio and video for simultaneous two-way communication. [ 1] There are many terms to refer to videotelephony. Videophones are standalone devices for video calling (compare Telephone ). In the present day, devices like smartphones and computers are capable of video ...

  6. FaceTime - Wikipedia

    en.wikipedia.org/wiki/FaceTime

    The iOS 7 betas limited FaceTime Audio to calls placed on a Wi-Fi network (the same original limitation of the video version of FaceTime), but the final release has removed that restriction to allow it to work over 3G and LTE data connections, as is the case with most carriers and plans about FaceTime with video.

  7. Earlier models make video calls utilizing older analogue POTS telephone lines, while later models use newer, higher quality, ADSL, ISDN or cable broadband technologies. Some videophones also employ Internet calling capabilities which can dispense with the need for telephone service. ACN: IRIS (United States) Avaya: Scopia videoconferencing systems

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