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2. 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 ...

3. FreePBX - Wikipedia

   en.wikipedia.org/wiki/FreePBX

   FreePBX is a web-based open-source graphical user interface (GUI) that manages Asterisk, a voice over IP and telephony server. [1] FreePBX is licensed under the GNU General Public License version 3. [2] It is a component of the FreePBX Distro, which is an independently maintained Linux system derived from the source code of the CentOS ...

4. 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 ...

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

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

   Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the three major cellular carriers in the country, AT&T Mobility, T-Mobile US, and Verizon. [1] [2] In 2016, MVNOs across the nation such as Metro PCS , Boost Mobile , Cricket Wireless , and Tracfone brands served about 36 million ...

6. Asterisk (PBX) - Wikipedia

   en.wikipedia.org/wiki/Asterisk_(PBX)

   Asterisk is a software implementation of a private branch exchange (PBX). In conjunction with suitable telephony hardware interfaces and network applications, Asterisk is used to establish and control telephone calls between telecommunication endpoints such as customary telephone sets, destinations on the public switched telephone network (PSTN) and devices or services on voice over Internet ...

7. Videotelephony - Wikipedia

   en.wikipedia.org/wiki/Videotelephony

   Videotelephony was popularized in the 2000s via free Internet services such as Skype and iChat, web plugins supporting H.26x video standards, and online telecommunication programs that promoted low cost, albeit lower quality, videoconferencing to virtually every location with an Internet connection.