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  2. International call - Wikipedia

    en.wikipedia.org/wiki/International_call

    International telephone calls are those made between different countries. These telephone calls are processed by international gateway exchanges (switches). Charges for these calls were high initially but declined greatly during the 20th century due to advances in technology liberalization. Originally they were placed via long-distance operators.

  3. International telecommunications routes - Wikipedia

    en.wikipedia.org/wiki/International...

    Satellite transmission adds a slight delay, which is noticeable even over transatlantic calls, though the call quality can be as good as a call over a fiber-optic cable. At the other end of the quality spectrum is a route using VoIP over the long-distance satellite link terminating in an ISP using a leaky PBX to terminate the calls.

  4. Long-distance calling - Wikipedia

    en.wikipedia.org/wiki/Long-distance_calling

    A trunk call is prefixed with '0' for national calls and '00' for international calls, following the European standard. It is now normal for local calls to cost the same as long-distance UK calls, and is now common, for a small extra monthly charge, to allow free calls to landlines within the UK.

  5. Wi-Fi calling - Wikipedia

    en.wikipedia.org/wiki/Wi-fi_calling

    Wi-Fi calling, also called VoWiFi, [1] refers to mobile phone voice calls and data that are made over IP networks using Wi-Fi, instead of the cell towers provided by cellular networks. [2] Using this feature, compatible handsets are able to route regular cellular calls through a wireless LAN (Wi-Fi) network with broadband Internet , while ...

  6. Rebtel - Wikipedia

    en.wikipedia.org/wiki/Rebtel

    Rebtel provides low-cost or free [5] international call services. Its service was first available as an intermediary service accessible by dialing a particular phone number but is now available through iOS and Android apps with a combined download count totaling over 10M users. [citation needed]

  7. Voice over IP - Wikipedia

    en.wikipedia.org/wiki/Voice_over_IP

    The broader terms Internet telephony, broadband telephony, and broadband phone service specifically refer to the delivery of voice and other communication services, such as fax, SMS, and voice messaging, over the Internet, in contrast to the traditional public switched telephone network (PSTN), commonly known as plain old telephone service (POTS).

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