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2. Elastix - Wikipedia

   en.wikipedia.org/wiki/Elastix

   It enables extensions to make calls via the public switched telephone network (PSTN) or via Voice over Internet Protocol (VoIP) services. Elastix 5.0 is an IP business phone system that supports standard SIP soft/hard phones, VoIP services and traditional PSTN phone lines. Elastix 2.5 is free software, released under the GNU General Public License.

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. Linphone - Wikipedia

   en.wikipedia.org/wiki/Linphone

   Linphone (contraction of Linux phone) is a free voice over IP softphone, SIP client and service. It may be used for audio and video direct calls and calls through any VoIP softswitch or IP-PBX . Linphone also provides the possibility to exchange instant messages.

5. Category:Free VoIP software - Wikipedia

   en.wikipedia.org/wiki/Category:Free_VoIP_software

   Free and open-source software portal This category is for packages that implement VOIP and are free software - that is to say that the source code is available under a free software licence . Subcategories

6. 10 Phone Systems for Small Businesses - AOL

   www.aol.com/10-phone-systems-small-businesses...

   OpenPhone subscriptions include unlimited calling and messaging, an auto attendant, call recording, and one new local or toll-free phone number. It integrates with email, HubSpot, Salesforce, and ...

7. Jami (software) - Wikipedia

   en.wikipedia.org/wiki/Jami_(software)

   Jami was developed and maintained by the Canadian company Savoir-faire Linux, [5] [6] and with the help of a global community of users and contributors, Jami positions itself as a potential free Skype replacement. [7] Jami is free software released under the GNU GPL-3.0-or-later. In November 2016, it became part of the GNU Project. [8]