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  2. List of mobile virtual network operators in the United States

    en.wikipedia.org/wiki/List_of_mobile_virtual...

    Learn about mobile virtual network operators (MVNOs) in the United States that lease wireless service from the major carriers. Find out which MVNOs offer Cricket Wireless, a prepaid service by AT&T Mobility.

  3. Comparison of VoIP software - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_VoIP_software

    This is a comparison of voice over IP (VoIP) software used to conduct telephone-like voice conversations across Internet Protocol (IP) based networks. For residential markets, voice over IP phone service is often cheaper than traditional public switched telephone network (PSTN) service and can remove geographic restrictions to telephone numbers, e.g., have a PSTN phone number in a New York ...

  4. FreePBX - Wikipedia

    en.wikipedia.org/wiki/FreePBX

    FreePBX is a web-based open-source graphical user interface that manages Asterisk, a voice over IP (VoIP) and telephony server. It was formerly part of the FreePBX Distro, a Linux system derived from CentOS with Asterisk pre-installed, but this distribution is discontinued due to CentOS being discontinued.

  5. Virtual number - Wikipedia

    en.wikipedia.org/wiki/Virtual_number

    A virtual number, also known as direct inward dialing (DID) or access numbers, is a telephone number without a directly associated telephone line. Usually, these numbers are programmed to forward incoming calls to one of the pre-set telephone numbers, chosen by the client: fixed, mobile or VoIP. A virtual number can work like a gateway between ...

  6. Voice over IP - Wikipedia

    en.wikipedia.org/wiki/Voice_over_IP

    Voice over IP (VoIP) is a method and group of technologies for voice calls over Internet Protocol (IP) networks, such as the Internet. Learn about the steps, principles, functions, and standards of VoIP, as well as its consumer and provider markets.

  7. Business telephone system - Wikipedia

    en.wikipedia.org/wiki/Business_telephone_system

    A business telephone system is a telephone system used in business environments, encompassing the range of technology from the key telephone system (KTS) to the private branch exchange (PBX). A PBX is a telephone exchange or switching system that serves a private organization, and differs from a KTS in that it requires an operator or attendant at a switchboard to establish connections.

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