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2. Textfree - Wikipedia

   en.wikipedia.org/wiki/Textfree

   TextFree (formerly called Pinger and sometimes stylized as textfree) is a mobile application and web service that allows users to send and receive text messages, as well as make and receive VoIP phone calls, for free over the internet. The service costs nothing because it is supported by ads, but users have the option of paying for an ad-free ...

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. List of SIP software - Wikipedia

   en.wikipedia.org/wiki/List_of_SIP_software

   ShoreTel IP phone systems with unified communications and contact center built in; Snom One free/blue/yellow (Snom acquired and renamed pbxnsip) (SIP) Speedflow Communications VoIP class 4/5 softswitches with integrated billing, transcoding, SIP-H.323 converter.

5. Jitsi - Wikipedia

   en.wikipedia.org/wiki/Jitsi

   Jitsi (from Bulgarian: жици — "wires") is a collection of free and open-source multiplatform voice (VoIP), video conferencing and instant messaging applications for the Web platform, Windows, Linux, macOS, iOS and Android.

6. Viber VoIP iPhone app: 3G calling, no registration, and ... - AOL

   www.aol.com/news/2010-12-04-viber-voip-iphone...

   It works as such: install the free app on your iPhone, provide just your phone number (no "registration" is necessary) and then fire it up. ... making it easy to see who you can VoIP call for free ...

7. The Benefits of VoIP Phone Systems - AOL

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

   According to the U.S. Federal Communications Commission (FCC), "Voice over Internet Protocol (VoIP) is a technology that allows you to make voice calls using a broadband Internet connection ...