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2. 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).

3. FreeSWITCH - Wikipedia

   en.wikipedia.org/wiki/FreeSWITCH

   FreeSWITCH is a free and open-source telephony software for real-time communication protocols using audio, video, text and other forms of media. The software has applications in WebRTC, voice over Internet Protocol (VoIP), video transcoding, Multipoint Control Unit (MCU) functionality and supports Session Initiation Protocol (SIP) features.

4. Voice over IP - Wikipedia

   en.wikipedia.org/wiki/Voice_over_IP

   A VoIP phone is necessary to connect to a VoIP service provider. This can be implemented in several ways: Dedicated VoIP phones connect directly to the IP network using technologies such as wired Ethernet or Wi-Fi. These are typically designed in the style of traditional digital business telephones.

5. The Benefits of VoIP Phone Systems - AOL

   www.aol.com/benefits-voip-phone-systems...

   Over 30% of U.S. companies use Voice over Internet Protocol (VoIP) phone systems. Many switch from conventional services to realize the benefits of VoIP, including lower costs, operational ...

6. Google Voice - Wikipedia

   en.wikipedia.org/wiki/Google_Voice

   Google provides free PC-to-PC voice calling worldwide. As described above, Google Voice users in many countries may make low-cost calls to international phone numbers, and currently may also make free PC-to-phone calls within the United States and Canada. Vincent Paquet, a co-founder of GrandCentral who became a senior product manager at Google ...

7. magicJack - Wikipedia

   en.wikipedia.org/wiki/MagicJack

   MagicJack, stylized as magicJack, is a service that allows people in the United States and Canada to make phone calls over the Internet. This type of phone service is called Internet-based telephone service (VoIP). Originally, MagicJack required a computer to work.