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2. List of SIP software - Wikipedia

   en.wikipedia.org/wiki/List_of_SIP_software

   Aricent SIP UA stack, B2BUA, proxy, VoLTE/RCS Client; AskoziaPBX; Avaya Application Server 5300 (AS5300), JITC certified ASSIP VoIP; Bicom Systems IP PBX for telecoms; Brekeke PBX, SIP PBX for service providers and enterprises; Cisco SIP Proxy Server, Cisco unified border element (CUBE), Cisco Unified Communication Manager (CUCM)

3. 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.

4. Comparison of VoIP software - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_VoIP_software

   Mixed: free software versions under GNU GPLv3 + shareware versions under gplv3 with exception of including proprietary code macOS version proprietary on App Store, free version limited to sponsored SIP provider; Windows version proprietary; Linux version open source ICE, SIP, MSRP, RFB (VNC), XCAP: Opus, speex, G.722, GSM, iLBC, PCMU, PCMA

5. SIP provider - Wikipedia

   en.wikipedia.org/wiki/SIP_provider

   A SIP provider (Session Initiation Protocol) is any telecommunications company which provides SIP trunking to customers, usually businesses. Many companies provide SIP "termination" (outbound calling) and "origination" (inbound calling, usually with a plain old telephone service (POTS) phone number, called a direct inward dialing (DID).

6. 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.

7. Comparison of cross-platform instant messaging clients

   en.wikipedia.org/wiki/Comparison_of_cross...

   2.5.11 [29] 2023-02-21 macOS 7.16.1 [30] 2023-03-17 Windows 7.14.1.2907 [31] 2023-03-23 Linphone: Belledonne Communications 2001; 24 years ago () Android 4.5.6 [32] 2021-11-08 GPL-3.0-or-later or proprietary: SIP protocol, could connect to any SIP provider/server, including Linphone's service only for SIP linphone service : over 700,000 in 2024 ...