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Comparison of VoIP software
open-in-new
<h2 id="core-components">Core components</h2> <ul><li>Conferencing servers for large-scale virtual meetings</li> <li>Intercom systems for internal communications</li> <li>Virtual foreign exchange services (FXOs)</li> <li>Hybrid systems supporting both VoIP and PSTN integration</li></ul> <h2 id="specialized-applications">Specialized applications</h2> <ul><li>Interactive Voice Response (IVR) systems</li> <li>Automated dictation platforms</li> <li>Professional call recording solutions</li> <li>Custom hold music and messaging systems</li></ul> <p>VoIP implementations generally fall into two categories: </p> <ul><li>Web-based solutions that operate through browsers, offering simplified deployment and platform independence</li></ul> <ul><li>Standalone desktop applications that provide enhanced features, superior reliability, and advanced feature sets</li></ul> <h2 id="desktop-applications">Desktop applications</h2> <table><tbody><tr><th>Program</th><th><a href="/facts/Operating_system/8XTuvMh2">Operating systems</a></th><th><a href="/facts/Software_license/7enfIqhL">License</a></th><th>Costs</th><th><a href="/facts/Communications_protocol/5uady7cB">Protocols</a></th><th><a href="/facts/Codec/C7b7Am8t">Codecs</a></th><th><a href="/facts/Encryption/16q29Fdv">Encryption</a></th><th>Max conference peers</th><th>Other abilities</th><th>Latest release</th></tr><tr><th><a href="/facts/Blink_(SIP_client)/8Um2U22U">Blink</a></th><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a></td><td>Mixed: free software versions under GNU GPLv3 + shareware versions under gplv3 with exception of including proprietary code</td><td>macOS version proprietary on App Store, free version limited to sponsored SIP provider; Windows version proprietary; Linux version open source</td><td><a href="/facts/Interactive_Connectivity_Establishment/cFb9HEn1">ICE</a>, <a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>, <a href="/facts/Message_Session_Relay_Protocol/gICzYwU2">MSRP</a>, <a href="/facts/RFB_protocol/c1DbCnok">RFB (VNC)</a>, <a href="/facts/XCAP/gXaRSgRR">XCAP</a></td><td><a href="/facts/Opus_(audio_codec)/VP4KuGre">Opus</a>, <a href="/facts/Speex/M7xqnPxN">speex</a>, <a href="/facts/G.722/z6J1sSuU">G.722</a>, <a href="/facts/GSM/Sw8QYaLE">GSM</a>, <a href="/facts/ILBC/rPQsKfjo">iLBC</a>, <a href="/facts/PCMU/Ve8vJ6mb">PCMU</a>, <a href="/facts/A-law_algorithm/PI9UC1nc">PCMA</a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a> and <a href="/facts/ZRTP/QLW7PIwP">ZRTP</a> on all versions, <a href="/facts/Off-the-Record_Messaging/RMdcs0f4">OTR/SMP</a> on Linux and macOS only<a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a></td><td>No limit</td><td>IM, file transfer, desktop sharing, multi-party conference, wideband</td><td>Blink Qt</td></tr><tr><th><a href="/facts/Battle.net/cP90Lg3e">Battle.net</a></th><td><a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/Android_(operating_system)/nNyHb0xz">Android</a>, <a href="/facts/IOS/mK5cggH5">iOS</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td>Free</td><td>Unknown</td><td>Unknown</td><td>Unknown</td><td>Unknown</td><td>IM, multi-party conference</td><td>Unknown</td></tr><tr><th><a href="/facts/Discord_(software)/1wped7PM">Discord</a></th><td><a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/Android_(operating_system)/nNyHb0xz">Android</a>, <a href="/facts/IOS/mK5cggH5">iOS</a>, <a href="/facts/Windows/bwhAhuSL">Windows</a>, <a href="/facts/Linux/9FvCKSTq">Linux</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td>Free, Premium "Nitro" Subscription for Additional Features.</td><td><a href="/facts/Real-time_Transport_Protocol/YKQK1RK2">RTP</a>, <a href="/facts/User_Datagram_Protocol/dxLU0D6q">UDP</a>, <a href="/facts/WebSocket/NcQrqpnv">WS</a>, <a href="/facts/HTTPS/MSWYz4zo">HTTPS</a></td><td><a href="/facts/Opus_(audio_codec)/VP4KuGre">Opus</a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a></td><td>5000 soft limit for voice calls,<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> 25 hard limit for video<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a></td><td>IM, file sharing, desktop sharing, in-game overlay</td><td>10.0.19045; December 19, 2024; 5 months ago (2024-12-19)</td></tr><tr><th><a href="/facts/Eyeball_Chat/y0FtI7xm">Eyeball Chat</a></th><td><a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td>Free</td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>, <a href="/facts/STUN/adARyNV0">STUN</a>, <a href="/facts/Interactive_Connectivity_Establishment/cFb9HEn1">ICE</a>, <a href="/facts/Extensible_Messaging_and_Presence_Protocol/hgulEuRA">XMPP</a></td><td>Unknown</td><td>Yes</td><td>5<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a></td><td>IM, Conferencing, Voice, Video and <a href="/facts/SIMPLE_(instant_messaging_protocol)/mrsWrTyz">SIMPLE</a> based presence</td><td><a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a> 3.2; 2009; 16 years ago (2009)</td></tr><tr><th><a href="/facts/FaceTime/EBzVmbfe">FaceTime</a></th><td><a href="/facts/IOS/mK5cggH5">iOS</a>, <a href="/facts/MacOS/Y93vVpTm">macOS</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td>Free</td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>, <a href="/facts/IETF/tIcCsFhX">IETF</a>, Signaling protocol for VoIP, <a href="/facts/STUN/adARyNV0">STUN</a>, <a href="/facts/TURN/mm3U33xV">TURN</a> and <a href="/facts/Interactive_Connectivity_Establishment/cFb9HEn1">ICE</a>| <a href="/facts/IETF/tIcCsFhX">IETF</a>, technologies for traversing firewalls and <a href="/facts/Network_address_translation/nFweFNfN">NAT</a></td><td><a href="/facts/H.264/soCzKcmJ">H.264</a> Video, <a href="/facts/AAC-LD/VndVLu7F">AAC-ELD</a> Audio, <a href="/facts/H.263/KSxo04Gy">H.263</a> and <a href="/facts/VP8/dfoDPMDg">VP8</a></td><td><a href="/facts/Real-time_Transport_Protocol/YKQK1RK2">RTP</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a> <a href="/facts/IETF/tIcCsFhX">IETF</a>|standards for delivering real-time and encrypted media streams for VoIP.</td><td>20</td><td>Video, voice, conferencing, with additional tools available as "Services".</td><td></td></tr><tr><th><a href="/facts/IBM_Lotus_Sametime/rPchxovG">IBM Sametime</a></th><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a>, mobile</td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td>?</td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>-<a href="/facts/SIMPLE_(instant_messaging_protocol)/mrsWrTyz">SIMPLE</a>, <a href="/facts/T.120/aAuS7jkp">T.120</a></td><td><a href="/facts/H.323/Lfj0ykI0">H.323</a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a></td><td>Unknown</td><td>IM, File transfer, Voice, Presence, Server stored contact list, HTTP tunneling, plugins, embedable in <a href="/facts/Lotus_Notes/X3KHrPQj">Lotus Notes</a><a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a></td><td>8.5.2; May 8, 2011; 14 years ago (2011-05-08)</td></tr><tr><th><a href="/facts/Jami_(software)/fVnJ3tAY">Jami</a></th><td><a href="/facts/Android_(operating_system)/nNyHb0xz">Android</a>, <a href="/facts/FreeBSD/RKsFTm7F">FreeBSD</a>, <a href="/facts/IOS/mK5cggH5">iOS</a>, <a href="/facts/IPhone/h5WeKRl9">iPhone</a>, <a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Microsoft Windows</a>, <a href="/facts/OS_X/Y93vVpTm">OS X</a><a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a></td><td><a href="/facts/GNU_General_Public_License/S75KhLSX">GPL-3.0-or-later</a></td><td>Free</td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>, <a href="/facts/Real-time_Transport_Protocol/YKQK1RK2">RTP</a>, <a href="/facts/STUN/adARyNV0">STUN</a> per account, <a href="/facts/SRV_record/5JdIlqDm">SRV</a>, <a href="/facts/Distributed_hash_table/3eDfAaoh">DHT</a>, <a href="/facts/Peer-to-peer/wCCdPb0H">P2P</a></td><td>Audio: <a href="/facts/Opus_(audio_codec)/VP4KuGre">Opus</a>, <a href="/facts/Speex/M7xqnPxN">Speex</a>, <a href="/facts/G.722/z6J1sSuU">G.722</a>, <a href="/facts/G.711/kopBvF25">G.711</a>, <a href="/facts/GSM/Sw8QYaLE">GSM</a>, <a href="/facts/VP8/dfoDPMDg">VP8</a>, <a href="/facts/G.729/BB4JexQf">G.729</a>, <a href="/facts/ILBC/rPQsKfjo">iLBC</a>. Video: <a href="/facts/H.264/soCzKcmJ">H.264</a>, <a href="/facts/H.263/KSxo04Gy">H.263</a>, <a href="/facts/VP8/dfoDPMDg">VP8</a>, <a href="/facts/MPEG-4/6svV1w2H">MPEG-4</a></td><td>Voice encryption (<a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a> with <a href="/facts/SDES/l1dNlHmE">SDES</a> or <a href="/facts/ZRTP/QLW7PIwP">ZRTP</a>) and signaling encryption (<a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>), multiple realms authentication mechanism</td><td>No limit</td><td><a href="/facts/Blockchain/8H43GgWy">Blockchain</a> ID-management, Gnome-KDE client, address book, multiple accounts, unlimited call number, call transfer, call hold-unhold, call recording, multi-way conferencing</td><td><table><tbody><tr><th scope="row">iOS</th><td>3.28 / December 17, 2021; 3 years ago (2021-12-17)<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a></td></tr><tr><th scope="row">Android</th><td>20211210-01 / December 21, 2021; 3 years ago (2021-12-21)<a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a></td></tr><tr><th scope="row">Windows</th><td>202112221025 / December 22, 2021; 3 years ago (2021-12-22) <a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a></td></tr><tr><th scope="row">macOS</th><td>2.10 / December 16, 2021; 3 years ago (2021-12-16)<a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a></td></tr></tbody></table></td></tr><tr><th><a href="/facts/Jitsi/YXb4BaJs">Jitsi</a></th><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a> (all java supported). <i>Experimental</i> <a href="/facts/Android_(operating_system)/nNyHb0xz">Android</a> builds are also available.<a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a></td><td><a href="/facts/Apache_License/5AeIjas8">Apache-2.0</a></td><td>Free</td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>-<a href="/facts/SIMPLE_(instant_messaging_protocol)/mrsWrTyz">SIMPLE</a>, <a href="/facts/Extensible_Messaging_and_Presence_Protocol/hgulEuRA">XMPP</a>-<a href="/facts/Jingle_(protocol)/PXkA74R1">Jingle</a> <a href="/facts/STUN/adARyNV0">STUN</a> <a href="/facts/Interactive_Connectivity_Establishment/cFb9HEn1">ICE</a>, <a href="/facts/Traversal_Using_Relays_around_NAT/mm3U33xV">TURN</a></td><td><a href="/facts/SILK/D3LIM71t">SILK</a>, <a href="/facts/G.722/z6J1sSuU">G.722</a>, <a href="/facts/Speex/M7xqnPxN">Speex</a>, <a href="/facts/Opus_(audio_codec)/VP4KuGre">Opus</a>, <a href="/facts/G.711/kopBvF25">G.711</a> (PCMU/PCMA), <a href="/facts/ILBC/rPQsKfjo">iLBC</a>, <a href="/facts/GSM/Sw8QYaLE">GSM</a>, <a href="/facts/G.729/BB4JexQf">G.729</a>, <a href="/facts/H.264/soCzKcmJ">H.264</a>, <a href="/facts/H.263/KSxo04Gy">H.263</a>, <a href="/facts/VP8/dfoDPMDg">VP8</a></td><td><a href="/facts/ZRTP/QLW7PIwP">ZRTP</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a>, <a href="/facts/Off-the-Record_Messaging/RMdcs0f4">OTR</a>, <a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a></td><td>Unknown</td><td>Text messaging, audio-video telephony, IPv6 (often broken,<a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a> P2P not supported<a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a>), call recording, 64-bit</td><td>2.10 (build.5550) (February 5, 2017; 8 years ago (2017-02-05)) <a href="https://en.wikipedia.org/w/index.php?title=Template:Latest_stable_software_release/Jitsi&action=edit">[±]</a></td></tr><tr><th><a href="/facts/Linphone/SeNaJJRY">Linphone</a></th><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a>, <a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/Android_(operating_system)/nNyHb0xz">Android</a>, <a href="/facts/IPhone/h5WeKRl9">iPhone</a>, <a href="/facts/BlackBerry/k9LGPyg5">BlackBerry</a></td><td><a href="/facts/GNU_General_Public_License/S75KhLSX">GPL-3.0-or-later</a></td><td>Free</td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a></td><td><a href="/facts/Speex/M7xqnPxN">Speex</a>, <a href="/facts/Opus_(audio_format)/VP4KuGre">Opus</a>, <a href="/facts/G711/kopBvF25">G711</a>, <a href="/facts/GSM/Sw8QYaLE">GSM</a>, <a href="/facts/G.722/z6J1sSuU">G.722</a>, <a href="/facts/VP8/dfoDPMDg">VP8</a> (WebM), <a href="/facts/H263/KSxo04Gy">H263</a>, <a href="/facts/MPEG4/6svV1w2H">MPEG4</a>, <a href="/facts/Theora/RnlKRQBb">Theora</a> and <a href="/facts/H264/soCzKcmJ">H264</a> (plugin)</td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a>, <a href="/facts/ZRTP/QLW7PIwP">ZRTP</a></td><td>Unknown</td><td>Video, IM, STUN, IPv6 (disables IPv4 support when enabled), P2P, Secure Encryption, User own Encryption via Provided API <a href="https://gitlab.linphone.org/BC/public/linphone-desktop">https://gitlab.linphone.org/BC/public/linphone-desktop</a></td><td>4.2.5; June 25, 2020; 4 years ago (2020-06-25), provides daily snapshots via <a href="http://www.linphone.org/snapshots">http://www.linphone.org/snapshots</a></td></tr><tr><th><a href="/facts/Messages_(Apple)/35k969FN">Messages</a></th><td><a href="/facts/MacOS/Y93vVpTm">macOS</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td>Free, only <a href="/facts/MacOS/Y93vVpTm">macOS</a> and <a href="/facts/IOS/mK5cggH5">iOS</a></td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a> <a href="/facts/AOL_Instant_Messenger/0dHP73Sk">AIM</a> <a href="/facts/ICQ/FnbSJ1GR">ICQ</a> <a href="/facts/Extensible_Messaging_and_Presence_Protocol/hgulEuRA">XMPP</a></td><td><a href="/facts/H263/KSxo04Gy">H263</a>, <a href="/facts/H264/soCzKcmJ">H264</a></td><td>Unknown</td><td>Unknown</td><td>Integrated, PBX independent</td><td>7.0; July 25, 2012; 12 years ago (2012-07-25)</td></tr><tr><th><a href="/facts/MicroSIP/pTuKcr4m">MicroSIP</a></th><td><a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a></td><td><a href="/facts/GNU_General_Public_License/S75KhLSX">GPL-2.0-or-later</a></td><td>Free</td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>, <a href="/facts/STUN/adARyNV0">STUN</a>, <a href="/facts/Interactive_Connectivity_Establishment/cFb9HEn1">ICE</a>, <a href="/facts/SIMPLE_(instant_messaging_protocol)/mrsWrTyz">SIMPLE</a></td><td><a href="/facts/Speex/M7xqnPxN">Speex</a>, <a href="/facts/ILBC/rPQsKfjo">iLBC</a>, <a href="/facts/GSM/Sw8QYaLE">GSM</a>, <a href="/facts/G.711/kopBvF25">G.711</a>, <a href="/facts/G.722/z6J1sSuU">G.722</a>, <a href="/facts/G.729/BB4JexQf">G.729</a>, <a href="/facts/SILK/D3LIM71t">SILK</a>, <a href="/facts/Linear_PCM/5gdfjtH3">Linear PCM</a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a></td><td>Unknown</td><td>Video, voice, IM and Presence</td><td>3.20.7 (25 August 2021; 3 years ago (2021-08-25)) <a href="https://en.wikipedia.org/w/index.php?title=Template:Latest_stable_software_release/MicroSIP&action=edit">[±]</a><a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a></td></tr><tr><th><a href="/facts/Movim/HtBf1aCm">Movim</a></th><td>Any, <a href="/facts/Progressive_web_application/IpkL2Yhb">Progressive web application</a></td><td><a href="/facts/GNU_General_Public_License/S75KhLSX">GPL-2.0-or-later</a></td><td>Free</td><td><a href="/facts/XMPP/hgulEuRA">XMPP</a>, <a href="/facts/STUN/adARyNV0">STUN</a>, <a href="/facts/TURN/mm3U33xV">TURN</a></td><td>Depending the web-browser</td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a></td><td>2</td><td>IM, microblogging, social-network, OMEMO encryption, screen-sharing, file transfer</td><td>2025-04-23</td></tr><tr><th><a href="/facts/Mumble_(software)/xXvl2yV0">Mumble</a></th><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/IOS/mK5cggH5">iOS</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a>, <a href="/facts/Android_(operating_system)/nNyHb0xz">Android</a></td><td><a href="/facts/New_BSD_license/XLtmLp5x">New BSD license</a></td><td>Free</td><td><a href="/facts/Interactive_Connectivity_Establishment/cFb9HEn1">ICE</a></td><td><a href="/facts/CELT/52Wt9cbu">CELT</a>, <a href="/facts/Speex/M7xqnPxN">Speex</a>, <a href="/facts/Opus_(audio_codec)/VP4KuGre">Opus</a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a> and <a href="/facts/OCB_mode/n5ucDXFx">OCB-AES128</a></td><td>No limit (limited only by server bandwidth and memory)</td><td>Chat with (limited) embedded HTML, <a href="/facts/Automatic_Gain_Control/qY7qWtC7">Automatic Gain Control</a>, very low <a href="/facts/Latency_(audio)/AtwyGGTU">latency</a>, <a href="/facts/Access_Control_Lists/t38J9Vao">Access Control Lists</a> for user management, Customizable In-Game Overlay for OpenGL and DirectX, Directional Audio, Plugin Support, Nested Channels, Echo cancellation for headset free use, Global Public Server List, Logitech G15 support, Push-To-Talk and Voice-Activation</td><td>1.4.287; September 14, 2022; 2 years ago (2022-09-14)</td></tr><tr><th><a href="/facts/Nymgo/t4jR7BFh">Nymgo</a></th><td><a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a>, <a href="/facts/Android_(operating_system)/nNyHb0xz">Android</a>, <a href="/facts/IOS/mK5cggH5">iOS</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td>Free</td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>, <a href="/facts/Real-time_Transport_Protocol/YKQK1RK2">RTP</a> and <a href="/facts/RTP_Control_Protocol/grCfaxxe">RTCP</a></td><td>Unknown</td><td>Yes</td><td>No limit</td><td>Address Book integration, Call recording/export, Mute, On Hold, Caller ID definition</td><td>4.2.9; March 2013; 12 years ago (2013-03)</td></tr><tr><th><a href="/facts/Phoner/sBUB60dy">Phoner</a></th><td><a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td>Free</td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>, <a href="/facts/Telephony_Application_Programming_Interface/IdN9Tt4D">TAPI</a>, <a href="/facts/Common_ISDN_Application_Programming_Interface/kWnpRmbl">CAPI</a></td><td><a href="/facts/G.711/kopBvF25">G.711a</a>, <a href="/facts/G.711/kopBvF25">G.711u</a>, <a href="/facts/G.722/z6J1sSuU">G.722</a>, <a href="/facts/G.726/7NXhvfV8">G.726</a>, <a href="/facts/G.729/BB4JexQf">G.729</a>, <a href="/facts/GSM/Sw8QYaLE">GSM</a>, <a href="/facts/ILBC/rPQsKfjo">iLBC</a>, <a href="/facts/Speex/M7xqnPxN">speex</a>, <a href="/facts/Opus_(audio_codec)/VP4KuGre">Opus</a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a>, <a href="/facts/ZRTP/QLW7PIwP">ZRTP</a></td><td>8</td><td>Conferencing, call redirection, call recording</td><td>3.23 (5 March 2021; 4 years ago (2021-03-05)) <a href="https://en.wikipedia.org/w/index.php?title=Template:Latest_stable_software_release/Phoner&action=edit">[±]</a><a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a></td></tr><tr><th><a href="/facts/PhonerLite/sBUB60dy">PhonerLite</a></th><td><a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td>Free</td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a></td><td><a href="/facts/G.711/kopBvF25">G.711a</a>, <a href="/facts/G.711/kopBvF25">G.711u</a>, <a href="/facts/G.722/z6J1sSuU">G.722</a>, <a href="/facts/G.726/7NXhvfV8">G.726</a>, <a href="/facts/G.729/BB4JexQf">G.729</a>, <a href="/facts/GSM/Sw8QYaLE">GSM</a>, <a href="/facts/ILBC/rPQsKfjo">iLBC</a>, <a href="/facts/Speex/M7xqnPxN">speex</a>, <a href="/facts/Opus_(audio_codec)/VP4KuGre">Opus</a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a>, <a href="/facts/ZRTP/QLW7PIwP">ZRTP</a></td><td>8</td><td>Conferencing, call redirection, call recording</td><td>3.28 (10 January 2025; 4 months ago (2025-01-10)) <a href="https://en.wikipedia.org/w/index.php?title=Template:Latest_stable_software_release/PhonerLite&action=edit">[±]</a><a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a></td></tr><tr><th><a href="/facts/Roger_Wilco_(software)/LupfmVqz">Roger Wilco GameSpy</a></th><td><a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td>?</td><td>Proprietary</td><td>?</td><td>?</td><td>Unknown</td><td>?</td><td>2001; 24 years ago (2001)</td></tr><tr><th><a href="/facts/Signal_(messaging_app)/1d9mpcMH">Signal</a></th><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a>, <a href="/facts/Android_(operating_system)/nNyHb0xz">Android</a>, <a href="/facts/IPhone/h5WeKRl9">iPhone</a></td><td><a href="/facts/GPLv3/S75KhLSX">GPLv3</a> clients and <a href="/facts/AGPLv3/n1h9A893">AGPLv3</a> server</td><td>Free</td><td>RingRTC (<a href="/facts/WebRTC/Ph9R1k9R">WebRTC</a> over <a href="/facts/Signal_Protocol/63QE16cf">Signal protocol</a><a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a>)</td><td><a href="/facts/Opus_(audio_format)/VP4KuGre">Opus</a><a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Signal_Protocol/63QE16cf">Signal Protocol</a><a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a></td><td>50<a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a></td><td>Signal also allows users to send text messages, files, voice notes, pictures, GIFs, and video messages over a Wi-Fi or data connection to other Signal users on iOS, Android and a desktop app. The app also supports group messaging, read receipts and typing indicators, both of which can be disabled.</td><td><table><tbody><tr><th scope="row">Android</th><td>7.38.6<a class="footnote-ref" id="fnref:21" href="#fn:21"><sup>21</sup></a> / 25 March 2025</td></tr><tr><th scope="row">iOS</th><td>7.51<a class="footnote-ref" id="fnref:22" href="#fn:22"><sup>22</sup></a> / 18 March 2025</td></tr><tr><th scope="row">Desktop</th><td>7.48.0<a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a> / 26 March 2025</td></tr></tbody></table></td></tr><tr><th><a href="/facts/Skype/qdKbuh23">Skype</a></th><td><a href="/facts/Linux/9FvCKSTq">Linux</a>(with limited functionality),<a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a> <a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a> 2000-XP-Vista-7-<a href="/facts/Windows_Mobile/YfskR7FS">Mobile</a> (unsupported), <a href="/facts/Binary_Runtime_Environment_for_Wireless/SMSgLsPI">BREW</a>, <a href="/facts/Windows_Phone/khEg0rGT">Windows Phone</a>, <a href="/facts/Android_(operating_system)/nNyHb0xz">Android</a>, <a href="/facts/IPhone/h5WeKRl9">iPhone</a>, <a href="/facts/PlayStation_Portable/dj4sa6wo">PSP</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td>Free</td><td>Proprietary P2P protocol <a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a></td><td><a href="/facts/SILK/D3LIM71t">SILK</a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a></td><td>25 starting with version 3.6.0.216. 10 with 2.x</td><td>Conferencing, video, file transfer, voicemail, Skype to phone, phone to Skype, additional P2P extensions (games, whiteboard, etc...); depending on platform.</td><td><table><tbody><tr><th scope="row"><a href="/facts/Windows/bwhAhuSL">Windows</a>, <a href="/facts/Universal_Windows_Platform_apps/PCIgnSjM">UWP</a>, discontinued</th><td>15.150.3125.0 / 5 May 2025; 19 days ago (2025-05-05)<a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a><a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a><a class="footnote-ref" id="fnref:28" href="#fn:28"><sup>28</sup></a></td></tr><tr><th scope="row"><a href="/facts/Windows/bwhAhuSL">Windows</a>, desktop, discontinued</th><td>8.150.0.125 / 5 May 2025; 19 days ago (2025-05-05)<a class="footnote-ref" id="fnref:29" href="#fn:29"><sup>29</sup></a><a class="footnote-ref" id="fnref:30" href="#fn:30"><sup>30</sup></a></td></tr><tr><th scope="row"><a href="/facts/MacOS/Y93vVpTm">macOS</a>, discontinued</th><td>8.150.0.125 / 5 May 2025; 19 days ago (2025-05-05)<a class="footnote-ref" id="fnref:31" href="#fn:31"><sup>31</sup></a><a class="footnote-ref" id="fnref:32" href="#fn:32"><sup>32</sup></a></td></tr><tr><th scope="row"><a href="/facts/Linux/9FvCKSTq">Linux</a>, discontinued</th><td>8.150.0.125 / 5 May 2025; 19 days ago (2025-05-05)<a class="footnote-ref" id="fnref:33" href="#fn:33"><sup>33</sup></a><a class="footnote-ref" id="fnref:34" href="#fn:34"><sup>34</sup></a></td></tr><tr><th scope="row"><a href="/facts/Android_(operating_system)/nNyHb0xz">Android</a>, discontinued</th><td>8.150.0.125 / 5 May 2025; 19 days ago (2025-05-05)<a class="footnote-ref" id="fnref:35" href="#fn:35"><sup>35</sup></a><a class="footnote-ref" id="fnref:36" href="#fn:36"><sup>36</sup></a><a class="footnote-ref" id="fnref:37" href="#fn:37"><sup>37</sup></a></td></tr><tr><th scope="row"><a href="/facts/IOS/mK5cggH5">iOS</a>, discontinued</th><td>8.150.0.125 / 5 May 2025; 19 days ago (2025-05-05)<a class="footnote-ref" id="fnref:38" href="#fn:38"><sup>38</sup></a><a class="footnote-ref" id="fnref:39" href="#fn:39"><sup>39</sup></a></td></tr></tbody></table></td></tr><tr><th><a href="/facts/Steam_Chat/nrpWwLA9">Steam Chat</a></th><td>Web, Phones, Desktop</td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td></td><td>WebRTC</td><td></td><td></td><td></td><td></td><td></td></tr><tr><th><a href="/facts/TeamSpeak/XtrjU6NR">TeamSpeak</a></th><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a>, <a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/FreeBSD/RKsFTm7F">FreeBSD</a>, <a href="/facts/Android_(operating_system)/nNyHb0xz">Android</a>, <a href="/facts/IOS/mK5cggH5">iOS</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td>Free</td><td>Unknown</td><td><a href="/facts/CELT/52Wt9cbu">CELT</a>, <a href="/facts/Speex/M7xqnPxN">Speex</a> (both until server version 3.5.0), <a href="/facts/Opus_(audio_format)/VP4KuGre">Opus</a><a class="footnote-ref" id="fnref:40" href="#fn:40"><sup>40</sup></a></td><td>Yes</td><td>32 unlicensed, 512 with Non-Profit License (available until September 2018), up to 1024 (Gamer License), 2000</td><td>Simultaneous server conferencing with tabs, 3D sound effects, scalable permissions system, firewall friendly file transfers, in-game overlay for DirectX & OpenGL games, global public server list, plugin system</td><td>3.5.5; November 4, 2020; 4 years ago (2020-11-04)</td></tr><tr><th><a href="/facts/TeamTalk/4IsTfYeu">TeamTalk</a></th><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a>, <a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/Android_(operating_system)/nNyHb0xz">Android</a>, <a href="/facts/IOS/mK5cggH5">iOS</a>, <a href="/facts/Raspbian/YGjcyaN7">Raspbian</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td>Free</td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td><a href="/facts/Opus_(audio_format)/VP4KuGre">Opus</a>, <a href="/facts/Speex/M7xqnPxN">Speex</a>, <a href="/facts/VP8/dfoDPMDg">VP8</a></td><td>No</td><td>1000</td><td>Video, file sharing, desktop sharing, stream media files (<a href="/facts/MP3/yrBpxUSD">MP3</a>, <a href="/facts/Audio_Video_Interleave/2pr8AoRT">AVI</a>)</td><td>5.3.3; November 2018; 6 years ago (2018-11)</td></tr><tr><th><a href="/facts/TeamViewer/cj3LyHEm">TeamViewer</a></th><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a>, <a href="/facts/MacOS/Y93vVpTm">macOS</a>, iOS, Android<a class="footnote-ref" id="fnref:41" href="#fn:41"><sup>41</sup></a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td>Free (personal use only)</td><td>Unknown</td><td>Unknown</td><td><a href="/facts/AES256/HdXGBY2Q">AES256</a></td><td>Unknown</td><td>Unknown</td><td><table><tbody><tr><th scope="row"><a href="/facts/Windows/bwhAhuSL">Windows</a> (desktop)</th><td>15.65.4 / 29 April 2025; 25 days ago (2025-04-29)<a class="footnote-ref" id="fnref:42" href="#fn:42"><sup>42</sup></a></td></tr><tr><th scope="row"><a href="/facts/MacOS/Y93vVpTm">macOS</a></th><td>15.65.4 / 29 April 2025; 25 days ago (2025-04-29)<a class="footnote-ref" id="fnref:43" href="#fn:43"><sup>43</sup></a></td></tr><tr><th scope="row"><a href="/facts/Linux/9FvCKSTq">Linux</a></th><td>15.65.4 / 29 April 2025; 25 days ago (2025-04-29)<a class="footnote-ref" id="fnref:44" href="#fn:44"><sup>44</sup></a></td></tr><tr><th scope="row"><a href="/facts/Android_(software)/nNyHb0xz">Android</a>/<a href="/facts/ChromeOS/zH0B5Xtk">ChromeOS</a></th><td>15.65.712 / 25 April 2025; 29 days ago (2025-04-25)<a class="footnote-ref" id="fnref:45" href="#fn:45"><sup>45</sup></a><a class="footnote-ref" id="fnref:46" href="#fn:46"><sup>46</sup></a><a class="footnote-ref" id="fnref:47" href="#fn:47"><sup>47</sup></a></td></tr><tr><th scope="row"><a href="/facts/IOS/mK5cggH5">iOS</a></th><td>15.65.1 / 29 April 2025; 25 days ago (2025-04-29)<a class="footnote-ref" id="fnref:48" href="#fn:48"><sup>48</sup></a><a class="footnote-ref" id="fnref:49" href="#fn:49"><sup>49</sup></a></td></tr><tr><th scope="row"><a href="/facts/Windows/bwhAhuSL">Windows</a> (<a href="/facts/UWP_app/PCIgnSjM">UWP app</a>, discontinued)</th><td>15.53.6 / 15 April 2024; 13 months ago (2024-04-15)<a class="footnote-ref" id="fnref:50" href="#fn:50"><sup>50</sup></a></td></tr></tbody></table></td></tr><tr><th><a href="/facts/Telephone_(application)/3v0HmaDI">Telephone</a></th><td><a href="/facts/MacOS/Y93vVpTm">macOS</a> 10.10.2</td><td><a href="/facts/BSD_licenses/XLtmLp5x">BSD</a></td><td>Free</td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>, <a href="/facts/STUN/adARyNV0">STUN</a>, <a href="/facts/Interactive_Connectivity_Establishment/cFb9HEn1">ICE</a></td><td>Unknown</td><td>No</td><td>Unknown</td><td>Address Book integration</td><td>1.1.4; March 6, 2012; 13 years ago (2012-03-06)</td></tr><tr><th><a href="/facts/Tuenti/5mvj9w0P">Tuenti</a></th><td><a href="/facts/Android_(operating_system)/nNyHb0xz">Android</a>, <a href="/facts/IPhone/h5WeKRl9">iPhone</a>, <a href="/facts/Windows_Phone/khEg0rGT">Windows Phone</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td>Free</td><td><a href="/facts/WebRTC/Ph9R1k9R">WebRTC</a>, <a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>, <a href="/facts/Extensible_Messaging_and_Presence_Protocol/hgulEuRA">XMPP</a></td><td><a href="/facts/Internet_Low_Bitrate_Codec/rPQsKfjo">iLBC</a>, <a href="/facts/Opus_(audio_codec)/VP4KuGre">Opus</a></td><td>Yes</td><td>Unknown</td><td>Voice, video, <a href="/facts/Instant_messaging/8lwwDyjK">Instant messaging</a>, group chat, photo and video sharing, SMS and MMS, native and social network contacts integration, incoming call/IM push notifications.</td><td></td></tr><tr><th><a href="/facts/Twinkle_(software)/vod9druv">Twinkle</a></th><td><a href="/facts/Linux/9FvCKSTq">Linux</a></td><td><a href="/facts/GNU_General_Public_License/S75KhLSX">GPL-2.0-or-later</a></td><td>Free</td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a></td><td><a href="/facts/G.711/kopBvF25">G.711</a> A-law μ-law, <a href="/facts/G.726/7NXhvfV8">G.726</a>, <a href="/facts/GSM_06.10/WFfuQf2C">GSM</a>, <a href="/facts/ILBC/rPQsKfjo">iLBC</a>, <a href="/facts/Speex/M7xqnPxN">Speex</a> narrow wide ultrawide</td><td><a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a>, <a href="/facts/ZRTP/QLW7PIwP">ZRTP</a></td><td>3</td><td>Conferencing, chat, file transfer, Firefox integration, call redirection, voicemail, support of VoIP-to-Phone services</td><td>1.10.3 (February 19, 2022; 3 years ago (2022-02-19)) <a href="https://en.wikipedia.org/w/index.php?title=Template:Latest_stable_software_release/Twinkle&action=edit">[±]</a></td></tr><tr><th><a href="/facts/Ventrilo/rFyUIMEK">Ventrilo</a></th><td><a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a>, <a href="/facts/IOS/mK5cggH5">iOS</a>, <a href="/facts/Android_(operating_system)/nNyHb0xz">Android</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td>Free</td><td>Unknown</td><td>Unknown</td><td>No</td><td>8</td><td>Conferencing, chat, <a href="/facts/Text-to-speech/ceTczTv9">text-to-speech</a></td><td>3.0.8</td></tr><tr><th><a href="/facts/Viber/1zUXunk2">Viber</a></th><td><a href="/facts/Linux/9FvCKSTq">Linux</a>,<a class="footnote-ref" id="fnref:51" href="#fn:51"><sup>51</sup></a> <a href="/facts/MacOS/Y93vVpTm">macOS</a>,<a class="footnote-ref" id="fnref:52" href="#fn:52"><sup>52</sup></a> <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a>,<a class="footnote-ref" id="fnref:53" href="#fn:53"><sup>53</sup></a> <a href="/facts/Android_(operating_system)/nNyHb0xz">Android</a>, <a href="/facts/Bada_(operating_system)/ABo74Jlz">Bada</a>, <a href="/facts/BlackBerry_OS/lqAPkYPT">BlackBerry OS</a>, <a href="/facts/IOS/mK5cggH5">iOS</a>, <a href="/facts/Series_40/4Cp8EpDL">Series 40</a>, <a href="/facts/Symbian/gbRl35V9">Symbian</a>, <a href="/facts/Windows_Phone/khEg0rGT">Windows Phone</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td>?</td><td>Unknown</td><td>Unknown</td><td>Yes<a class="footnote-ref" id="fnref:54" href="#fn:54"><sup>54</sup></a></td><td>Unknown</td><td>Varies by platform: Text, picture and video messaging on all, voice calling only on iPhone, Android and Microsoft's Windows Phone</td><td><table><tbody><tr><th scope="row">Android</th><td>20.4.3.0<a class="footnote-ref" id="fnref:55" href="#fn:55"><sup>55</sup></a> / 2 July 2023; 22 months ago (2 July 2023)</td></tr><tr><th scope="row">iOS</th><td>20.4.0<a class="footnote-ref" id="fnref:56" href="#fn:56"><sup>56</sup></a> / 4 July 2023; 22 months ago (4 July 2023)</td></tr><tr><th scope="row">Windows</th><td>20.2.0<a class="footnote-ref" id="fnref:57" href="#fn:57"><sup>57</sup></a> / 12 June 2023; 23 months ago (12 June 2023)</td></tr><tr><th scope="row">macOS</th><td>20.2.0<a class="footnote-ref" id="fnref:58" href="#fn:58"><sup>58</sup></a> / 12 June 2023; 23 months ago (12 June 2023)</td></tr><tr><th scope="row">Linux</th><td>20.3.0.1<a class="footnote-ref" id="fnref:59" href="#fn:59"><sup>59</sup></a> / 14 June 2023; 23 months ago (14 June 2023)</td></tr></tbody></table></td></tr><tr><th><a href="/facts/Wire_(software)/ISUS4Yfd">Wire</a></th><td>Linux, Windows, macOS, iOS, Android, Web</td><td>GPLv3</td><td>not free</td><td>?</td><td>Audio: <a href="/facts/Opus_(audio_format)/VP4KuGre">Opus</a><p>Video: <a href="/facts/VP8/dfoDPMDg">VP8</a></p></td><td><a href="/facts/Datagram_Transport_Layer_Security/WxzxdITB">DTLS</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a><a class="footnote-ref" id="fnref:60" href="#fn:60"><sup>60</sup></a></td><td>10<a class="footnote-ref" id="fnref:61" href="#fn:61"><sup>61</sup></a></td><td>End-to-end encryption by default for everything, instant messaging, video call, video group call, file sharing, GIF sharing, push to talk, edit message, delete message (on both side), timed messages, doodling, identity verification, screen sharing (desktop only)</td><td>?</td></tr><tr><th><a href="/facts/Yate_(telephony_engine)/1kS3kAJr">Yate Client</a></th><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a></td><td><a href="/facts/GNU_General_Public_License/S75KhLSX">GPL</a></td><td>Free</td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>, <a href="/facts/Inter-Asterisk_eXchange/0TWzWubm">IAX</a>, <a href="/facts/Extensible_Messaging_and_Presence_Protocol/hgulEuRA">XMPP</a>, <a href="/facts/H.323/Lfj0ykI0">H.323</a></td><td><a href="/facts/G.711/kopBvF25">G.711a</a>, <a href="/facts/G.711/kopBvF25">G.711u</a>, <a href="/facts/GSM_06.10/WFfuQf2C">GSM 06.10</a>, <a href="/facts/ILBC/rPQsKfjo">iLBC</a>, <a href="/facts/Speex/M7xqnPxN">Speex</a>, <a href="/facts/G.723/5YvgKwaj">G.723</a>, <a href="/facts/G.726/7NXhvfV8">G.726</a>, <a href="/facts/G.728/x3aq2vED">G.728</a>, <a href="/facts/G.729/BB4JexQf">G.729</a></td><td><a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a>, maybe <a href="/facts/ZRTP/QLW7PIwP">ZRTP</a>?</td><td>Unknown</td><td></td><td>6.0.0; September 2017; 7 years ago (2017-09)</td></tr><tr><th><a href="/facts/Zfone/vBopgVxQ">Zfone</a></th><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a> (with viewable source)</td><td>Includes time bomb provision</td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>, <a href="/facts/Real-time_Transport_Protocol/YKQK1RK2">RTP</a></td><td>Unknown</td><td><a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a>, <a href="/facts/ZRTP/QLW7PIwP">ZRTP</a></td><td>Unknown</td><td></td><td><a href="/facts/Development_stage/z4Q4RElA">Beta</a> 2008-09-04 (<a href="/facts/Linux/9FvCKSTq">Linux</a> 0.9.224), (<a href="/facts/MacOS/Y93vVpTm">macOS</a> 0.9.246), (<a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a> 0.9.206)</td></tr></tbody></table> <h2 id="mobile-phones">Mobile phones</h2> <p>For <a href="/facts/Mobile_VoIP/sk9vnQBR">mobile VoIP</a> clients: </p> <table><tbody><tr><th>Program</th><th><a href="/facts/Operating_system/8XTuvMh2">Operating systems</a></th><th><a href="/facts/Software_license/7enfIqhL">License</a></th><th><a href="/facts/Open-source_software/HzTaB8E9">Open source</a></th><th><a href="/facts/Communications_protocol/5uady7cB">Protocols</a></th><th><a href="/facts/Codec/C7b7Am8t">Codecs</a></th><th><a href="/facts/Encryption/16q29Fdv">Encryption</a></th><th>Other abilities</th><th>Latest release</th></tr><tr><td><a href="/facts/Jami_(software)/fVnJ3tAY">Jami</a></td><td><a href="/facts/IOS/mK5cggH5">iOS</a>, <a href="/facts/Android_(operating_system)/nNyHb0xz">Android</a><a class="footnote-ref" id="fnref:62" href="#fn:62"><sup>62</sup></a></td><td><a href="/facts/GNU_General_Public_License/S75KhLSX">GPLv3</a></td><td>Yes</td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a></td><td>Video: H264, VP8, MP4V, H263, Audio: <a href="/facts/Opus_(audio_format)/VP4KuGre">Opus</a> 48000 hz, G722 PCMA, PCMU</td><td><a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a>, SIP over <a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a></td><td>?</td><td>Version 202103261733 March 2021; 4 years ago (2021-03)</td></tr><tr><td><a href="/facts/Line_(application)/YIjD8gGq">Line</a></td><td>Android, iOS</td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td>No</td><td>?</td><td>?</td><td>?</td><td>?</td><td></td></tr><tr><td><a href="/facts/Signal_(messaging_app)/1d9mpcMH">Signal</a></td><td>iOS, Android</td><td><a href="/facts/GNU_General_Public_License/S75KhLSX">GPLv3</a></td><td>Yes</td><td><a href="/facts/WebRTC/Ph9R1k9R">WebRTC</a><a class="footnote-ref" id="fnref:63" href="#fn:63"><sup>63</sup></a></td><td><a href="/facts/Opus_(audio_format)/VP4KuGre">Opus</a><a class="footnote-ref" id="fnref:64" href="#fn:64"><sup>64</sup></a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Signal_Protocol/63QE16cf">Signal Protocol</a><a class="footnote-ref" id="fnref:65" href="#fn:65"><sup>65</sup></a></td><td>End-to-end encryption by default for everything. CallKit and location privacy,<a class="footnote-ref" id="fnref:66" href="#fn:66"><sup>66</sup></a> one-to-one and group messaging, video calling,<a class="footnote-ref" id="fnref:67" href="#fn:67"><sup>67</sup></a> image/video sharing, timed messages, identity verification, screenshot blocking. Android only: SMS/MMS messaging, doodling,<a class="footnote-ref" id="fnref:68" href="#fn:68"><sup>68</sup></a> GIF sharing.<a class="footnote-ref" id="fnref:69" href="#fn:69"><sup>69</sup></a></td><td>Android 5.2.3 / 15 September 2023<p>iOS 6.41.1 / 15 September 2023Desktop 1.33.4 / 13 September 2023</p></td></tr><tr><td><a href="/facts/Sipdroid/vDN3He38">Sipdroid</a></td><td><a href="/facts/Android_(operating_system)/nNyHb0xz">Android</a></td><td><a href="/facts/GNU_General_Public_License/S75KhLSX">GPL</a></td><td>Yes</td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a></td><td>?</td><td>?</td><td>Uses <a href="/facts/Wi-Fi/u94quCsx">Wi-Fi</a>, <a href="/facts/3G/K1noBd8n">3G</a> or <a href="/facts/Enhanced_Data_Rates_for_GSM_Evolution/WA4pSXEt">EDGE</a></td><td>2.7</td></tr><tr><td><a href="/facts/Tango_(application)/nIEGvFaD">Tango</a></td><td>iOS, Android, Microsoft Windows, macOS, Windows Phone</td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a>, <a href="/facts/Freeware/c8oGA9ju">freeware</a></td><td>?</td><td>?</td><td>?</td><td>?</td><td>VoIP, Wi-Fi out & in, SMS over IP, call-through & call-back, instant messaging, videoconferencing</td><td>?</td></tr><tr><td><a href="/facts/WhatsApp/VMlSeFb6">WhatsApp</a></td><td><p>Android, BlackBerry, iOS, Symbian, Windows Phone</p></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a>, <a href="/facts/Freeware/c8oGA9ju">freeware</a></td><td>No</td><td>?</td><td>?</td><td><a href="/facts/Elliptic_curve_Diffie%25E2%2580%2593Hellman/zy3IJCeK">ECDH</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a><a class="footnote-ref" id="fnref:70" href="#fn:70"><sup>70</sup></a></td><td>VoIP and instant messaging over Wi-Fi or a data connection.</td><td><table><tbody><tr><th scope="row">iOS</th><td>25.4.77<a class="footnote-ref" id="fnref:71" href="#fn:71"><sup>71</sup></a> / February 25, 2025; 2 months ago (February 25, 2025)</td></tr><tr><th scope="row">Android</th><td>2.25.6.74<a class="footnote-ref" id="fnref:72" href="#fn:72"><sup>72</sup></a> / March 10, 2025; 2 months ago (March 10, 2025)</td></tr><tr><th scope="row">Windows</th><td>2.2502.3.0<a class="footnote-ref" id="fnref:73" href="#fn:73"><sup>73</sup></a> / January 20, 2025; 4 months ago (January 20, 2025)</td></tr><tr><th scope="row">macOS</th><td>25.4.77<a class="footnote-ref" id="fnref:74" href="#fn:74"><sup>74</sup></a> / February 25, 2025; 2 months ago (February 25, 2025)</td></tr></tbody></table></td></tr></tbody></table> <h2 id="frameworks-and-libraries">Frameworks and libraries</h2> <table><tbody><tr><th>Program</th><th><a href="/facts/Operating_system/8XTuvMh2">Operating systems</a></th><th><a href="/facts/Software_license/7enfIqhL">License</a></th><th><a href="/facts/Communications_protocol/5uady7cB">Protocols</a>, based on, compatible with</th><th><a href="/facts/Encryption/16q29Fdv">Encryption</a></th><th>Other abilities</th><th>Key and target markets</th><th>Latest release</th></tr><tr><td><a href="/facts/Telepathy_(software)/zPznJ7NN">Telepathy</a>, <a href="/facts/Farstream/szlVFou8">Farstream</a></td><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a></td><td><a href="/facts/GNU_Lesser_General_Public_License/AXwkz9x3">LGPL</a></td><td>SIP, <a href="/facts/Extensible_Messaging_and_Presence_Protocol/hgulEuRA">XMPP</a> (<a href="/facts/Jingle_(protocol)/PXkA74R1">Jingle</a>), <a href="/facts/Interactive_Connectivity_Establishment/cFb9HEn1">ICE</a> (STUN/TURN), <a href="/facts/Universal_Plug_and_Play/nrUmlpGr">UPnP</a></td><td>No</td><td>Multi-user A/V conferencing, IM, collaborative applications</td><td>Mobile devices (Maemo, Meego), Linux desktop or embedded</td><td>spec 0.27.2; September 24, 2013; 11 years ago (2013-09-24)</td></tr><tr><td><a href="/facts/Open_Phone_Abstraction_Library/xsWPrI4w">OPAL</a></td><td><a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a>, <a href="/facts/Linux/9FvCKSTq">Linux</a> (including embedded variants), <a href="/facts/MacOS/Y93vVpTm">macOS</a></td><td><a href="/facts/Mozilla_Public_License/hBuvAz1w">MPL</a></td><td>SIP, H.323, IAX2, CAPI, VXML</td><td>Unknown</td><td>Multi-user A/V conferencing, IM, IVR</td><td>Softphones, softswitches, telephony application servers</td><td>3.14.3; October 10, 2014; 10 years ago (2014-10-10)</td></tr><tr><td><a href="/facts/OSIP/THs46uYa">GNU oSIP</a></td><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a>, <a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/Android_(operating_system)/nNyHb0xz">Android</a>, <a href="/facts/IPhone/h5WeKRl9">iPhone</a>, <a href="/facts/BlackBerry/k9LGPyg5">BlackBerry</a></td><td><a href="/facts/GNU_Lesser_General_Public_License/AXwkz9x3">LGPL</a></td><td>SIP, SDP</td><td>Unknown</td><td>Multi-user A/V conferencing, IM, IVR</td><td>Softphones, embedded and mobile devices, telephony application servers</td><td>4.1.0; December 18, 2013; 11 years ago (2013-12-18)</td></tr></tbody></table> <h2 id="server-software">Server software</h2> <table><tbody><tr><th>Name</th><th><a href="/facts/Operating_system/8XTuvMh2">Operating systems</a></th><th><a href="/facts/Software_license/7enfIqhL">License</a></th><th><a href="/facts/Communications_protocol/5uady7cB">Protocols</a></th><th><a href="/facts/Encryption/16q29Fdv">Encryption</a></th><th>Notable features</th><th>Target markets</th><th><a href="/facts/Software_release_life_cycle/z4Q4RElA">Latest release</a></th></tr><tr><td><a href="/facts/3CX_Phone_System/Je7csMvS">3CX Phone System</a></td><td><a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a>, <a href="/facts/Linux/9FvCKSTq">Linux</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a></td><td><a href="/facts/Voice_over_IP/5QGBbXYg">VoIP</a>/<a href="/facts/VideoOverIP/yTK8DIfV">VideoOverIP</a> calls and conferencing, <a href="/facts/Voicemail/NLevuCf0">voicemail</a> and <a href="/facts/Instant_messaging/8lwwDyjK">instant messaging</a></td><td>< 50,000 users</td><td>18.2; December 8, 2021; 3 years ago (2021-12-08)</td></tr><tr><td><a href="/facts/AskoziaPBX/YnoXRClK">AskoziaPBX</a></td><td><a href="/facts/Standalone_program/2KduaAxh">Standalone program</a> (<a href="/facts/Linux/9FvCKSTq">Linux</a>-based)</td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>, <a href="/facts/H.323/Lfj0ykI0">H.323</a>, <a href="/facts/Inter-Asterisk_eXchange/0TWzWubm">IAX</a>, <a href="/facts/Skinny_Client_Control_Protocol/AY8WGHlj">SCCP</a></td><td>No</td><td><a href="/facts/Integrated_Services_Digital_Network/zcV99rUb">ISDN</a>, <a href="/facts/Voicemail/NLevuCf0">voicemail</a>, <a href="/facts/Conference_call/fk2BI3Se">conferencing</a>, <a href="/facts/Music_on_hold/p9Xel5zu">MOH</a>, <a href="/facts/Automatic_call_distributor/twlPtwRs">ACD</a>, <a href="/facts/Interactive_voice_response/UJvnBdL7">IVR</a>, <a href="/facts/Call_forwarding/BLBtG2pU">call forwarding</a>, <a href="/facts/Call-recording_software/rFsTktj1">call recording</a></td><td><a href="/facts/Small_and_medium_enterprises/86CC7BvV">SMEs</a> up to 50 users</td><td>5.4; September 2, 2017; 7 years ago (2017-09-02)</td></tr><tr><td><a href="/facts/Asterisk_PBX/cyMPMw18">Asterisk PBX</a></td><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/Berkeley_Software_Distribution/XQKcURrh">BSD</a>, <a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/Solaris_(operating_system)/KPfT98EJ">Solaris</a></td><td><a href="/facts/GNU_General_Public_License/S75KhLSX">GPL-2.0+</a>, optional: <a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a><a class="footnote-ref" id="fnref:75" href="#fn:75"><sup>75</sup></a></td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>, <a href="/facts/H.323/Lfj0ykI0">H.323</a>, <a href="/facts/Inter-Asterisk_eXchange/0TWzWubm">IAX</a>, <a href="/facts/Media_Gateway_Control_Protocol/Q8Af7pRQ">MGCP</a>, <a href="/facts/VoFR/jeGrl8jM">VoFR</a>, <a href="/facts/XMPP/hgulEuRA">XMPP</a>, <a href="/facts/Google_Talk/DuDglrNP">Google Talk</a>, <a href="/facts/Time-division_multiplexing/tv7bMh1v">TDM</a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a></td><td><a href="/facts/Voice_over_IP/5QGBbXYg">VoIP</a> gateway, <a href="/facts/Voicemail/NLevuCf0">voicemail</a>, basic accounting (expandable with <a href="/facts/Open_Database_Connectivity/2dV2Fm5j">ODBC</a>-compliant database), billing, <a href="/facts/Conference_call/fk2BI3Se">conferencing</a>, <a href="/facts/Hot_desking/c0N8KFGW">hot desking</a>, <a href="/facts/Interactive_voice_response/UJvnBdL7">IVR</a> trees with conditional logic, <a href="/facts/Call_waiting/CTQTktqy">call waiting</a>, <a href="/facts/Automatic_call_distributor/twlPtwRs">automated call distribution</a></td><td>Enthusiasts, developers, enterprise users (capacity dependent on server design, scalable across multiple servers)</td><td>21.3.1 (17 May 2024; 12 months ago (2024-05-17)<a class="footnote-ref" id="fnref:76" href="#fn:76"><sup>76</sup></a>)<p>20.5.0 LTS (18 October 2023; 19 months ago (2023-10-18)<a class="footnote-ref" id="fnref:77" href="#fn:77"><sup>77</sup></a>)19.8.1 (7 July 2023; 22 months ago (2023-07-07)<a class="footnote-ref" id="fnref:78" href="#fn:78"><sup>78</sup></a>)18.20.0 LTS (18 October 2023; 19 months ago (2023-10-18)<a class="footnote-ref" id="fnref:79" href="#fn:79"><sup>79</sup></a>)</p></td></tr><tr><td><a href="/facts/Brekeke_PBX/fVxNlc9J">Brekeke PBX</a></td><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a> <a href="/facts/Windows_Server_2016/LBMMCjYC">Server 2016</a> and <a href="/facts/Windows_Server_2019/pYAj0Xv4">Server 2019</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a></td><td><a href="/facts/Voice_over_IP/5QGBbXYg">VoIP</a>/<a href="/facts/VideoOverIP/yTK8DIfV">VideoOverIP</a> calls and conferencing, <a href="/facts/Voicemail/NLevuCf0">voicemail</a></td><td>Hosted service providers, Mid-large enterprise</td><td>3.12.2.2; January 11, 2022; 3 years ago (2022-01-11)</td></tr><tr><td><a href="/facts/CommuniGate_Pro/NxnwCbjP">CommuniGate Pro</a></td><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/Berkeley_Software_Distribution/XQKcURrh">BSD</a>, <a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a>, <a href="/facts/Solaris_(operating_system)/KPfT98EJ">Solaris</a>, <a href="/facts/HP-UX/hIvLDdJF">HP-UX</a>, <a href="/facts/IBM_AIX/cRWERua2">AIX</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>, <a href="/facts/XIMSS/NxnwCbjP">XIMSS</a>, <a href="/facts/XMPP/hgulEuRA">XMPP</a>, <a href="/facts/WebRTC/Ph9R1k9R">WebRTC</a></td><td><a href="/facts/Secure_Sockets_Layer/pGy16TnA">SSL</a>, <a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a></td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a> Registrar/Proxy, Authentication, <a href="/facts/Diameter_(protocol)/d6mkAmuI">Diameter</a>, <a href="/facts/RADIUS/NfNur5Q5">RADIUS</a>, <a href="/facts/Telephone_number_mapping/pstRkFpk">ENUM</a></td><td><a href="/facts/Mobile_network_operator/6Tt5J4TF">Mobile network operators</a>, <a href="/facts/Internet_service_provider/dUacAxef">ISPs</a>, <a href="/facts/Software_as_a_service/LPyPQ5b7">SaaS</a> providers</td><td>6.2.14; August 16, 2019; 5 years ago (2019-08-16)</td></tr><tr><td><a href="/facts/Dial_Gate_VoIP_Softswitch/mTvjbhXG">Dial Gate VoIP Softswitch</a></td><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a></td><td>Billing server, real-time account and line monitoring, <a href="/facts/Web_portal/Fj25GpUE">web portal</a></td><td><a href="/facts/Softswitch/zffbQ7h5">Softswitch</a> users, service providers</td><td>4.3; June 1, 2014; 10 years ago (2014-06-01)</td></tr><tr><td><a href="/facts/Dial-Office_IP-PBX/Sewbmhra">Dial-Office IP-PBX</a></td><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a></td><td>Unified communications, <a href="/facts/Conference_call/fk2BI3Se">conference calls</a>, remote worker support and <a href="/facts/Voicemail/NLevuCf0">voicemail</a></td><td>Small businesses, Mid-large enterprises</td><td>4.1; December 2013; 11 years ago (2013-12)</td></tr><tr><td><a href="/facts/Elastix/Iv4BkbH4">Elastix</a></td><td><a href="/facts/Linux/9FvCKSTq">Linux</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>, <a href="/facts/Inter-Asterisk_eXchange/0TWzWubm">IAX</a>, <a href="/facts/H.323/Lfj0ykI0">H.323</a>, <a href="/facts/XMPP/hgulEuRA">XMPP</a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a></td><td>Unified communication server that also supports chat, mail and fax.</td><td>Capacity dependent on server design, scalable across multiple servers</td><td>5.0.0; December 7, 2016; 8 years ago (2016-12-07)</td></tr><tr><td><a href="/facts/FreeSWITCH/AaTYepEy">FreeSWITCH</a></td><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/Berkeley_Software_Distribution/XQKcURrh">BSD</a>, <a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/Solaris_(operating_system)/KPfT98EJ">Solaris</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a></td><td><a href="/facts/Mozilla_Public_License/hBuvAz1w">Mozilla Public License</a></td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>, <a href="/facts/NAT-PMP/u5a7Tmg6">NAT-PMP</a>, <a href="/facts/STUN/adARyNV0">STUN</a>, <a href="/facts/SIMPLE_(instant_messaging_protocol)/mrsWrTyz">SIMPLE</a>, <a href="/facts/Extensible_Messaging_and_Presence_Protocol/hgulEuRA">XMPP</a>, <a href="/facts/Google_Talk/DuDglrNP">Google Talk</a> (<a href="/facts/Jingle_(protocol)/PXkA74R1">Jingle</a>), <a href="/facts/Inter-Asterisk_eXchange/0TWzWubm">IAX</a>, <a href="/facts/H.323/Lfj0ykI0">H.323</a>, <a href="/facts/Media_Resource_Control_Protocol/dEfIV8z6">MRCP</a>, <a href="/facts/RSS/WBAWrkdj">RSS</a>, <a href="/facts/Skype/qdKbuh23">Skype</a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a>, <a href="/facts/ZRTP/QLW7PIwP">ZRTP</a></td><td>Recording, Voicemail, Conferencing, <a href="/facts/RADIUS/NfNur5Q5">RADIUS</a>, <a href="/facts/Telephone_number_mapping/pstRkFpk">ENUM</a>, IM Proxy, Streaming, Media gateway, Soft-PBX, IVR (modular)</td><td>Large soft-switch users, home <a href="/facts/Private_branch_exchange/eLWvlhzs">PBX</a> users, softphone users</td><td>1.10.11 (December 22, 2023; 17 months ago (2023-12-22)<a class="footnote-ref" id="fnref:80" href="#fn:80"><sup>80</sup></a>) <a href="https://en.wikipedia.org/w/index.php?title=Template:Latest_stable_software_release/FreeSWITCH&action=edit">[±]</a></td></tr><tr><td><a href="/facts/FreePBX/YvA0JgLN">FreePBX</a></td><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/Berkeley_Software_Distribution/XQKcURrh">BSD</a>, <a href="/facts/Solaris_(operating_system)/KPfT98EJ">Solaris</a></td><td><a href="/facts/GNU_General_Public_License/S75KhLSX">GPL</a></td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>, <a href="/facts/Inter-Asterisk_eXchange/0TWzWubm">IAX</a>, <a href="/facts/H.323/Lfj0ykI0">H.323</a>, <a href="/facts/XMPP/hgulEuRA">XMPP</a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a></td><td>Complete PABX Service, based on <a href="/facts/Asterisk_PBX/cyMPMw18">Asterisk</a> and PHP 5.6; provides a full replacement for a legacy non-VoIP phone system; under current and active development</td><td>Scales from Raspberry PI (3 users) to multiple parallel clusters (10K+ simultaneous calls)</td><td>14.0; August 2017; 7 years ago (2017-08)</td></tr><tr><td><a href="/facts/Galene_(software)/L33UUKmF">Galene</a></td><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/Unix/0pNL2seI">Unix</a>, <a href="/facts/Mac_OS/EkobAhow">Mac OS</a>, <a href="/facts/Windows/bwhAhuSL">Windows</a></td><td><a href="/facts/MIT_Licence/8llAQtlk">MIT Licence</a></td><td><a href="/facts/WebRTC/Ph9R1k9R">WebRTC</a>, WHIP</td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a></td><td>Lightweight, efficient, easy to install and to administer</td><td>Teaching, conferences, meetings</td><td>0.96.2; January 2025; 4 months ago (2025-01)</td></tr><tr><td><a href="/facts/GNU_Gatekeeper/8vTbnYel">GNU Gatekeeper</a></td><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/FreeBSD/RKsFTm7F">FreeBSD</a>, <a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a> XP-2000-Vista-7</td><td><a href="/facts/GNU_General_Public_License/S75KhLSX">GPL</a></td><td><a href="/facts/H.323/Lfj0ykI0">H.323</a></td><td><a href="/facts/H.235/ps3oHI1I">H.235</a></td><td>H.460.18 firewall traversal, routing, accounting</td><td>video conferencing, VoIP carriers large and small</td><td>3.7; August 15, 2014; 10 years ago (2014-08-15)</td></tr><tr><td><a href="/facts/HERO_Hosted_PBX/XE51gczm">HERO Hosted PBX</a></td><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a></td><td>Unified Communications, billing server, cloud-based management and web interface</td><td>Mid-large enterprises, VoIP carriers and service providers, telecom operators</td><td>4.3; December 2013; 11 years ago (2013-12)</td></tr><tr><td><a href="/facts/Mumble_(software)/xXvl2yV0">Murmur</a></td><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/Berkeley_Software_Distribution/XQKcURrh">BSD</a>, <a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a></td><td><a href="/facts/BSD_licenses/XLtmLp5x">BSD</a>, <a href="/facts/GNU_General_Public_License/S75KhLSX">GPL</a></td><td><a href="/facts/CELT/52Wt9cbu">CELT</a>, <a href="/facts/Speex/M7xqnPxN">Speex</a>, <a href="/facts/Opus_(audio_codec)/VP4KuGre">Opus</a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a></td><td>Chat with (limited) embedded HTML, ACLs for user management, Customizable In-Game Overlay, Directional Audio, Plugin Support, Nested Channels</td><td>Individuals to Small and medium enterprise (25-5000 users)</td><td>1.2.17; September 24, 2016; 8 years ago (2016-09-24)</td></tr><tr><td><a href="/facts/Kamailio/XcbxcYhw">Kamailio</a>, <a href="/facts/OpenSIPS/XcbxcYhw">OpenSIPS</a> (formerly named OpenSER)</td><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/Berkeley_Software_Distribution/XQKcURrh">BSD</a>, <a href="/facts/Solaris_(operating_system)/KPfT98EJ">Solaris</a></td><td><a href="/facts/GNU_General_Public_License/S75KhLSX">GPL</a></td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>, <a href="/facts/Extensible_Messaging_and_Presence_Protocol/hgulEuRA">XMPP</a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a></td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a> registrar-proxy, authentication, <a href="/facts/Diameter_(protocol)/d6mkAmuI">Diameter</a>, <a href="/facts/RADIUS/NfNur5Q5">RADIUS</a>, <a href="/facts/Telephone_number_mapping/pstRkFpk">ENUM</a>, least-cost-routing, many others</td><td>SIP Service Providers</td><td>5.2.8; October 2020; 4 years ago (2020-10)</td></tr><tr><td><a href="/facts/SIP_Express_Router_(SER)/XcbxcYhw">SIP Express Router (SER)</a></td><td><a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/Berkeley_Software_Distribution/XQKcURrh">BSD</a>, <a href="/facts/Solaris_(operating_system)/KPfT98EJ">Solaris</a></td><td><a href="/facts/GNU_General_Public_License/S75KhLSX">GPL</a></td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a></td><td>No</td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a> Registrar/Proxy, Authentication, <a href="/facts/Diameter_(protocol)/d6mkAmuI">Diameter</a>, <a href="/facts/RADIUS/NfNur5Q5">RADIUS</a>, <a href="/facts/Telephone_number_mapping/pstRkFpk">ENUM</a>, many others</td><td>SIP Service Providers</td><td>2.0.0 Ottendorf</td></tr><tr><td><a href="/facts/SipX/pmeKGXAr">sipXecs IP PBX</a></td><td><a href="/facts/Linux/9FvCKSTq">Linux</a></td><td><a href="/facts/GNU_Affero_General_Public_License/n1h9A893">AGPL</a></td><td>Native <a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a> call control, <a href="/facts/Extensible_Messaging_and_Presence_Protocol/hgulEuRA">XMPP</a></td><td><a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a></td><td>Full redundancy (HA), instant messaging, voicemail, user portal, admin GUI, plug & play management including phones and gateways, fully featured</td><td>Enterprises between 10 and 10,000 users, multi-site</td><td>14.04.2; July 2014; 10 years ago (2014-07)</td></tr><tr><td><a href="/facts/VzRoom/081llSc8">vzRoom</a></td><td><a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a></td><td><a href="/facts/Proprietary_software/9zcskxYL">Proprietary</a></td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a></td><td><a href="/facts/Secure_Sockets_Layer/pGy16TnA">SSL</a>, <a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Advanced_Encryption_Standard/HdXGBY2Q">AES</a></td><td>Instant messaging-chat, VoIP, video, sharing (desktop, video, file), whiteboard, scheduler, recording</td><td>Individual to small and medium enterprise (2-1,000 users)</td><td>0.8.8.735; November 2010; 14 years ago (2010-11)</td></tr><tr><td><a href="/facts/Yate_(telephony_engine)/1kS3kAJr">Yate</a></td><td><a href="/facts/Berkeley_Software_Distribution/XQKcURrh">BSD</a>, <a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a></td><td><a href="/facts/GNU_General_Public_License/S75KhLSX">GPL</a></td><td><a href="/facts/Session_Initiation_Protocol/cbjUoNqP">SIP</a>, <a href="/facts/Inter-Asterisk_eXchange/0TWzWubm">IAX</a>, <a href="/facts/H.323/Lfj0ykI0">H.323</a>, <a href="/facts/ISDN/zcV99rUb">ISDN</a>, <a href="/facts/Extensible_Messaging_and_Presence_Protocol/hgulEuRA">XMPP</a> (Jabber), <a href="/facts/Jingle_(protocol)/PXkA74R1">Jingle</a> (<a href="/facts/Google_Talk/DuDglrNP">Google Talk</a>), <a href="/facts/Media_Gateway_Control_Protocol/Q8Af7pRQ">MGCP</a>, <a href="/facts/Signalling_System_No._7/YJ3T8VqE">SS7</a> over IP, Cisco SLT (Signalling Link Transport) (SS7 MTP2 backhaul over IP), <a href="/facts/Stream_Control_Transmission_Protocol/s8tmzUhz">SCTP</a>, <a href="/facts/Skinny_Client_Control_Protocol/AY8WGHlj">SCCP</a>, <a href="/facts/Transaction_Capabilities_Application_Part/AFMSBzUR">TCAP</a>, <a href="/facts/Mobile_Application_Part/cg5hVbuv">MAP</a> <a href="/facts/Customised_Applications_for_Mobile_networks_Enhanced_Logic/CNTWH6QP">CAMEL</a></td><td><a href="/facts/Secure_Sockets_Layer/pGy16TnA">SSL</a>, <a href="/facts/Transport_Layer_Security/pGy16TnA">TLS</a>, <a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a></td><td>Voice, video, file transfer, data, H323 to SIP signalling proxy, instant messaging, <a href="/facts/Interactive_Voice_Response/UJvnBdL7">IVR</a>, PC2Phone and Phone2PC gateway, SCCP — GTT routing between networks, Secure Unified Communications, SIP registrar-proxy, SIP SBC (session border controller), USSD, voicemail, VoIP, VoIP to PSTN gateway, conference server (max 200 voice channels per conference), call centre server, prepaid and postpaid cards</td><td>Deployed on home servers and large networks with millions of users</td><td>6.3; February 2021; 4 years ago (2021-02)</td></tr></tbody></table> <h2 id="secure-voip-software">Secure VoIP software</h2> <h3>VoIP software with client-to-client encryption</h3> <p>The following table is an overview of those VoIP clients which (can) provide <a href="/facts/End-to-end_encryption/e1MwRzEU">end-to-end encryption</a>. </p> <table><tbody><tr><th rowspan="2">Client name</th><th rowspan="2">Development status</th><th rowspan="2"><a href="/facts/Open-source_software/HzTaB8E9">Open source</a> client</th><th rowspan="2">End-to-end authentication<a class="footnote-ref" id="fnref:81" href="#fn:81"><sup>81</sup></a></th><th colspan="4"><a href="/facts/Cryptographic_protocol/0WuyTkFo">Encryption protocols</a></th><th rowspan="2"><a href="/facts/Forward_secrecy/ojScslsj">Forward secrecy</a></th><th rowspan="2">Multiple encryption</th><th rowspan="2">Encrypted group calling</th><th rowspan="2"><a href="/facts/Proxy_server/ArhwQE74">Proxy</a>, <a href="/facts/Tor_(anonymity_network)/Wj6jjkx1">Tor</a></th></tr><tr><th><a href="/facts/ZRTP/QLW7PIwP">ZRTP</a></th><th><a href="/facts/ECDH/zy3IJCeK">ECDH</a></th><th><a href="/facts/Datagram_Transport_Layer_Security/WxzxdITB">DTLS</a></th><th><a href="/facts/Secure_Real-time_Transport_Protocol/LBXehUtz">SRTP</a></th></tr><tr><th><a href="/facts/FaceTime/EBzVmbfe">FaceTime</a></th><td>Active</td><td>No<a class="footnote-ref" id="fnref:82" href="#fn:82"><sup>82</sup></a></td><td>Yes<a class="footnote-ref" id="fnref:83" href="#fn:83"><sup>83</sup></a></td><td>?</td><td>?</td><td>?</td><td>Yes<a class="footnote-ref" id="fnref:84" href="#fn:84"><sup>84</sup></a></td><td>Yes</td><td>?</td><td>Yes</td><td>No</td></tr><tr><th><a href="/facts/Jami_(software)/fVnJ3tAY">Jami</a></th><td>Active</td><td>Yes</td><td>Yes</td><td>No</td><td>?</td><td>Yes</td><td>Yes</td><td>Yes</td><td>?</td><td>Yes</td><td>?</td></tr><tr><th><a href="/facts/Jitsi/YXb4BaJs">Jitsi</a><a class="footnote-ref" id="fnref:85" href="#fn:85"><sup>85</sup></a></th><td>Active</td><td>Yes</td><td>Yes<a class="footnote-ref" id="fnref:86" href="#fn:86"><sup>86</sup></a></td><td>Yes</td><td>No</td><td>Yes</td><td>Yes</td><td>Yes<a class="footnote-ref" id="fnref:87" href="#fn:87"><sup>87</sup></a></td><td>Yes</td><td>Yes</td><td>?</td></tr><tr><th><a href="/facts/Line_(application)/YIjD8gGq">Line</a><a class="footnote-ref" id="fnref:88" href="#fn:88"><sup>88</sup></a><a class="footnote-ref" id="fnref:89" href="#fn:89"><sup>89</sup></a></th><td>Active</td><td>No</td><td>?</td><td>?</td><td>?</td><td>?</td><td>?</td><td>?</td><td>?</td><td>No<a class="footnote-ref" id="fnref:90" href="#fn:90"><sup>90</sup></a></td><td>No</td></tr><tr><th><a href="/facts/Linphone/SeNaJJRY">Linphone</a><a class="footnote-ref" id="fnref:91" href="#fn:91"><sup>91</sup></a></th><td>Active</td><td>Yes</td><td>Yes</td><td>Yes</td><td>?</td><td>Yes</td><td>Yes</td><td>Yes</td><td>Yes</td><td>?</td><td>No</td></tr><tr><th><a href="/facts/Signal_(messaging_app)/1d9mpcMH">Signal</a></th><td>Active</td><td>Yes</td><td>Yes<a class="footnote-ref" id="fnref:92" href="#fn:92"><sup>92</sup></a></td><td>No</td><td>Yes</td><td>No</td><td>Yes</td><td>Yes<a class="footnote-ref" id="fnref:93" href="#fn:93"><sup>93</sup></a></td><td>Yes</td><td>Yes</td><td>Depends<a class="footnote-ref" id="fnref:94" href="#fn:94"><sup>94</sup></a></td></tr><tr><th><a href="/facts/Skype/qdKbuh23">Skype</a>(opt-in per conversation,one pair of devices per conversation)<a class="footnote-ref" id="fnref:95" href="#fn:95"><sup>95</sup></a></th><td>Active</td><td>No</td><td>Yes<a class="footnote-ref" id="fnref:96" href="#fn:96"><sup>96</sup></a></td><td>No</td><td>No</td><td>No</td><td>Yes<a class="footnote-ref" id="fnref:97" href="#fn:97"><sup>97</sup></a></td><td>?</td><td>?</td><td>No</td><td>No</td></tr><tr><th><a href="/facts/Telegram_(messaging_service)/TqaAlHwN">Telegram</a></th><td>Active</td><td>Yes</td><td>Yes<a class="footnote-ref" id="fnref:98" href="#fn:98"><sup>98</sup></a></td><td>No</td><td>No</td><td>No</td><td>No</td><td>Yes</td><td>?</td><td>No</td><td>No</td></tr><tr><th><a href="/facts/Threema/HcxX31Rf">Threema</a></th><td>Active</td><td>Partially<a class="footnote-ref" id="fnref:99" href="#fn:99"><sup>99</sup></a><a class="footnote-ref" id="fnref:100" href="#fn:100"><sup>100</sup></a></td><td>Yes<a class="footnote-ref" id="fnref:101" href="#fn:101"><sup>101</sup></a></td><td>No</td><td>Yes<a class="footnote-ref" id="fnref:102" href="#fn:102"><sup>102</sup></a></td><td>Yes<a class="footnote-ref" id="fnref:103" href="#fn:103"><sup>103</sup></a></td><td>Yes<a class="footnote-ref" id="fnref:104" href="#fn:104"><sup>104</sup></a></td><td>Partially<a class="footnote-ref" id="fnref:105" href="#fn:105"><sup>105</sup></a><a class="footnote-ref" id="fnref:106" href="#fn:106"><sup>106</sup></a></td><td>Yes</td><td>No</td><td>No</td></tr><tr><th><a href="/facts/Viber/1zUXunk2">Viber</a><a class="footnote-ref" id="fnref:107" href="#fn:107"><sup>107</sup></a></th><td>Active</td><td>No</td><td>?</td><td>?</td><td>?</td><td>?</td><td>?</td><td>?</td><td>?</td><td>?</td><td>No</td></tr><tr><th><a href="/facts/WhatsApp/VMlSeFb6">WhatsApp</a></th><td>Active</td><td>Partially<a class="footnote-ref" id="fnref:108" href="#fn:108"><sup>108</sup></a><a class="footnote-ref" id="fnref:109" href="#fn:109"><sup>109</sup></a></td><td>Yes<a class="footnote-ref" id="fnref:110" href="#fn:110"><sup>110</sup></a></td><td>No</td><td>Yes<a class="footnote-ref" id="fnref:111" href="#fn:111"><sup>111</sup></a></td><td>No</td><td>Yes<a class="footnote-ref" id="fnref:112" href="#fn:112"><sup>112</sup></a></td><td>Yes<a class="footnote-ref" id="fnref:113" href="#fn:113"><sup>113</sup></a></td><td>Yes<a class="footnote-ref" id="fnref:114" href="#fn:114"><sup>114</sup></a></td><td>Yes<a class="footnote-ref" id="fnref:115" href="#fn:115"><sup>115</sup></a></td><td>No</td></tr><tr><th><a href="/facts/Wire_(software)/ISUS4Yfd">Wire</a></th><td>Active</td><td>Yes</td><td>Yes<a class="footnote-ref" id="fnref:116" href="#fn:116"><sup>116</sup></a></td><td>No</td><td>?</td><td>Yes<a class="footnote-ref" id="fnref:117" href="#fn:117"><sup>117</sup></a></td><td>Yes<a class="footnote-ref" id="fnref:118" href="#fn:118"><sup>118</sup></a></td><td>Yes<a class="footnote-ref" id="fnref:119" href="#fn:119"><sup>119</sup></a></td><td>Yes</td><td>Yes</td><td>No</td></tr><tr><th><a href="/facts/Zfone/vBopgVxQ">Zfone</a></th><td>Abandonware</td><td>Viewable source<a class="footnote-ref" id="fnref:120" href="#fn:120"><sup>120</sup></a></td><td>Yes</td><td>Yes</td><td>Optional<a class="footnote-ref" id="fnref:121" href="#fn:121"><sup>121</sup></a></td><td>?</td><td>Yes<a class="footnote-ref" id="fnref:122" href="#fn:122"><sup>122</sup></a></td><td>Yes</td><td>Yes</td><td>?</td><td>?</td></tr></tbody></table> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Comparison_of_audio_coding_formats/vn4Ym1dR">Comparison of audio coding formats</a></li> <li><a href="/facts/Comparison_of_cross-platform_instant_messaging_clients/NPcs51Dw">Comparison of cross-platform instant messaging clients</a></li> <li><a href="/facts/Comparison_of_web_conferencing_software/77aynuNE">Comparison of web conferencing software</a></li> <li><a href="/facts/List_of_codecs/e5nTCc5X">List of codecs</a></li> <li><a href="/facts/List_of_SIP_software/rJ8YoRFS">List of SIP software</a></li> <li><a href="/facts/List_of_video_telecommunication_services_and_product_brands/RAIm2yta">List of video telecommunication services and product brands</a></li> <li><a href="/facts/Matrix_(protocol)/nV0oNTsr">Matrix (protocol)</a></li> <li><a href="/facts/Secure_communication/XkAkCLM8">Secure communication</a></li> <li><a href="/facts/Comparison_of_user_features_of_messaging_platforms/LkQY0E33">Comparison of user features of messaging platforms</a></li></ul> <h2 id="notes">Notes</h2> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"Download Blink". Blink Project's Website. 14 January 2016. Retrieved 22 June 2016. <a href="http://icanblink.com/download/" target="_blank">http://icanblink.com/download/</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"Discord on Twitter". Twitter. Retrieved 2016-12-29. <a href="https://twitter.com/discordapp/status/814546030612148224" target="_blank">https://twitter.com/discordapp/status/814546030612148224</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"Wave Hello to Server Video". Retrieved 2020-06-21. <a href="https://blog.discord.com/wave-hello-to-server-video-85dcef1128f0" target="_blank">https://blog.discord.com/wave-hello-to-server-video-85dcef1128f0</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>eyeballchat.com[usurped]. EyeballChat.com. <a href="https://web.archive.org/web/20090321090148/http://eyeballchat.com/" target="_blank">https://web.archive.org/web/20090321090148/http://eyeballchat.com/</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>"Telephony with Lotus Sametime software". IBM.com. Retrieved 2010-02-16 <a href="http://www-01.ibm.com/software/lotus/products/sametime/telephony.html" target="_blank">http://www-01.ibm.com/software/lotus/products/sametime/telephony.html</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>"News". Ring. 2018-07-25. Archived from the original on 2018-12-26. Retrieved 2018-12-01. <a href="https://web.archive.org/web/20181226012459/https://ring.cx/en/news" target="_blank">https://web.archive.org/web/20181226012459/https://ring.cx/en/news</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>"Jami". App Store. <a href="https://apps.apple.com/app/id1306951055" target="_blank">https://apps.apple.com/app/id1306951055</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>"Jami - Apps on Google Play". play.google.com. <a href="https://play.google.com/store/apps/details?id=cx.ring&hl=en_US" target="_blank">https://play.google.com/store/apps/details?id=cx.ring&hl=en_US</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>"Index of /windows". dl.ring.cx. <a href="https://dl.ring.cx/windows/" target="_blank">https://dl.ring.cx/windows/</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> <li id="fn:10"><p>"Jami". Mac App Store. <a href="https://apps.apple.com/app/id1388475331" target="_blank">https://apps.apple.com/app/id1388475331</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></p></li> <li id="fn:11"><p>"Jitsi (SIP Communicator) Android — Nightly Builds Index". Jitsi.org. Archived from the original on 2014-11-29. Retrieved 2014-11-15. <a href="https://web.archive.org/web/20141129035757/https://download.jitsi.org/jitsi/nightly/android/" target="_blank">https://web.archive.org/web/20141129035757/https://download.jitsi.org/jitsi/nightly/android/</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></p></li> <li id="fn:12"><p>Interview with Emil Ivov, Deploy360 blog <a href="https://www.internetsociety.org/deploy360/blog/2013/03/video-emil-ivov-about-jitsi-a-voip-softphone-supporting-ipv6-and-dnssec/" target="_blank">https://www.internetsociety.org/deploy360/blog/2013/03/video-emil-ivov-about-jitsi-a-voip-softphone-supporting-ipv6-and-dnssec/</a> <a href="#fnref:12" class="footnote-back-ref">↩</a></p></li> <li id="fn:13"><p>"[#JITSI-1166] P2P IPv6 calls still do not work with explicit IPv6 addresses, no matter if brackets are used — Java.net JIRA". Java.net. Archived from the original on 2014-02-21. Retrieved 2014-02-13. <a href="https://web.archive.org/web/20140221210327/https://java.net/jira/browse/JITSI-1166" target="_blank">https://web.archive.org/web/20140221210327/https://java.net/jira/browse/JITSI-1166</a> <a href="#fnref:13" class="footnote-back-ref">↩</a></p></li> <li id="fn:14"><p>Release history on MicroSIP download page <a href="https://www.microsip.org/downloads" target="_blank">https://www.microsip.org/downloads</a> <a href="#fnref:14" class="footnote-back-ref">↩</a></p></li> <li id="fn:15"><p>Release history on Phoner download page <a href="https://phoner.de/download_en.htm" target="_blank">https://phoner.de/download_en.htm</a> <a href="#fnref:15" class="footnote-back-ref">↩</a></p></li> <li id="fn:16"><p>Changelog on PhonerLite download page <a href="https://lite.phoner.de/download_en.htm" target="_blank">https://lite.phoner.de/download_en.htm</a> <a href="#fnref:16" class="footnote-back-ref">↩</a></p></li> <li id="fn:17"><p>"Video calls for Signal now in public beta". Signal. 2017-03-13. Retrieved 2020-03-02. <a href="https://signal.org/blog/signal-video-calls-beta/" target="_blank">https://signal.org/blog/signal-video-calls-beta/</a> <a href="#fnref:17" class="footnote-back-ref">↩</a></p></li> <li id="fn:18"><p>"Video calls for Signal now in public beta". Signal. 2017-03-13. Retrieved 2020-03-02. <a href="https://signal.org/blog/signal-video-calls-beta/" target="_blank">https://signal.org/blog/signal-video-calls-beta/</a> <a href="#fnref:18" class="footnote-back-ref">↩</a></p></li> <li id="fn:19"><p>Marlinspike, Moxie (14 February 2017). "Video calls for Signal now in public beta". Open Whisper Systems. Retrieved 22 March 2017. <a href="https://whispersystems.org/blog/signal-video-calls-beta/" target="_blank">https://whispersystems.org/blog/signal-video-calls-beta/</a> <a href="#fnref:19" class="footnote-back-ref">↩</a></p></li> <li id="fn:20"><p>"Group Calling - Voice or Video". Signal Support. Retrieved 18 December 2024. <a href="https://support.signal.org/hc/en-us/articles/360052977792-Group-Calling-Voice-or-Video" target="_blank">https://support.signal.org/hc/en-us/articles/360052977792-Group-Calling-Voice-or-Video</a> <a href="#fnref:20" class="footnote-back-ref">↩</a></p></li> <li id="fn:21"><p>"Release 7.38.6". <a href="https://github.com/signalapp/Signal-Android/releases" target="_blank">https://github.com/signalapp/Signal-Android/releases</a> <a href="#fnref:21" class="footnote-back-ref">↩</a></p></li> <li id="fn:22"><p>"Release 7.51". <a href="https://github.com/signalapp/Signal-iOS/releases" target="_blank">https://github.com/signalapp/Signal-iOS/releases</a> <a href="#fnref:22" class="footnote-back-ref">↩</a></p></li> <li id="fn:23"><p>"Release 7.48.0". <a href="https://github.com/signalapp/Signal-Desktop/releases" target="_blank">https://github.com/signalapp/Signal-Desktop/releases</a> <a href="#fnref:23" class="footnote-back-ref">↩</a></p></li> <li id="fn:24"><p>"Microsoft to retire Skype Linux app on July 1". 9 June 2017. <a href="http://opensourceforu.com/2017/06/microsoft-retire-skype-linux-app-july-1/" target="_blank">http://opensourceforu.com/2017/06/microsoft-retire-skype-linux-app-july-1/</a> <a href="#fnref:24" class="footnote-back-ref">↩</a></p></li> <li id="fn:25"><p>It is possible to connect by SIP to the Skype network via additional "Skype Connect" PBX software and alternative (SIP) client software/hardware. Neither the Skype software nor the Skype network supports SIP directly[24] <a href="#fnref:25" class="footnote-back-ref">↩</a></p></li> <li id="fn:26"><p>"Release Notes for Skype for Windows, Mac and Linux". Skype Support. Retrieved 2025-05-06. <a href="https://support.microsoft.com/en-us/skype/what-s-new-in-skype-for-windows-mac-linux-and-web-d32f674c-abb3-40a5-a0b7-ee269ca60831" target="_blank">https://support.microsoft.com/en-us/skype/what-s-new-in-skype-for-windows-mac-linux-and-web-d32f674c-abb3-40a5-a0b7-ee269ca60831</a> <a href="#fnref:26" class="footnote-back-ref">↩</a></p></li> <li id="fn:27"><p>"Get Skype". Skype. Retrieved 2025-05-06. <a href="https://www.skype.com/en-us/get-skype/" target="_blank">https://www.skype.com/en-us/get-skype/</a> <a href="#fnref:27" class="footnote-back-ref">↩</a></p></li> <li id="fn:28"><p>"Skype". Microsoft Apps. Retrieved 2025-05-06. <a href="https://apps.microsoft.com/detail/9wzdncrfj364" target="_blank">https://apps.microsoft.com/detail/9wzdncrfj364</a> <a href="#fnref:28" class="footnote-back-ref">↩</a></p></li> <li id="fn:29"><p>"Release Notes for Skype for Windows, Mac and Linux". Skype Support. Retrieved 2025-05-06. <a href="https://support.microsoft.com/en-us/skype/what-s-new-in-skype-for-windows-mac-linux-and-web-d32f674c-abb3-40a5-a0b7-ee269ca60831" target="_blank">https://support.microsoft.com/en-us/skype/what-s-new-in-skype-for-windows-mac-linux-and-web-d32f674c-abb3-40a5-a0b7-ee269ca60831</a> <a href="#fnref:29" class="footnote-back-ref">↩</a></p></li> <li id="fn:30"><p>"Get Skype". Skype. Retrieved 2025-05-06. <a href="https://www.skype.com/en-us/get-skype/" target="_blank">https://www.skype.com/en-us/get-skype/</a> <a href="#fnref:30" class="footnote-back-ref">↩</a></p></li> <li id="fn:31"><p>"Release Notes for Skype for Windows, Mac and Linux". Skype Support. Retrieved 2025-05-06. <a href="https://support.microsoft.com/en-us/skype/what-s-new-in-skype-for-windows-mac-linux-and-web-d32f674c-abb3-40a5-a0b7-ee269ca60831" target="_blank">https://support.microsoft.com/en-us/skype/what-s-new-in-skype-for-windows-mac-linux-and-web-d32f674c-abb3-40a5-a0b7-ee269ca60831</a> <a href="#fnref:31" class="footnote-back-ref">↩</a></p></li> <li id="fn:32"><p>"Get Skype". Skype. Retrieved 2025-05-06. <a href="https://www.skype.com/en-us/get-skype/" target="_blank">https://www.skype.com/en-us/get-skype/</a> <a href="#fnref:32" class="footnote-back-ref">↩</a></p></li> <li id="fn:33"><p>"Release Notes for Skype for Windows, Mac and Linux". Skype Support. Retrieved 2025-05-06. <a href="https://support.microsoft.com/en-us/skype/what-s-new-in-skype-for-windows-mac-linux-and-web-d32f674c-abb3-40a5-a0b7-ee269ca60831" target="_blank">https://support.microsoft.com/en-us/skype/what-s-new-in-skype-for-windows-mac-linux-and-web-d32f674c-abb3-40a5-a0b7-ee269ca60831</a> <a href="#fnref:33" class="footnote-back-ref">↩</a></p></li> <li id="fn:34"><p>"Install Skype on Linux". Snap Store. Retrieved 2025-05-06. <a href="https://snapcraft.io/skype" target="_blank">https://snapcraft.io/skype</a> <a href="#fnref:34" class="footnote-back-ref">↩</a></p></li> <li id="fn:35"><p>"Release Notes for Skype on Mobile". Skype Support. Retrieved 2025-05-06. <a href="https://support.microsoft.com/en-us/skype/what-s-new-in-skype-on-mobile-9e8b3dfe-5254-40fc-b1bf-b5b35f156c1b" target="_blank">https://support.microsoft.com/en-us/skype/what-s-new-in-skype-on-mobile-9e8b3dfe-5254-40fc-b1bf-b5b35f156c1b</a> <a href="#fnref:35" class="footnote-back-ref">↩</a></p></li> <li id="fn:36"><p>"Skype". Google Play. Retrieved 2025-05-06. <a href="https://play.google.com/store/apps/details?id=com.skype.raider" target="_blank">https://play.google.com/store/apps/details?id=com.skype.raider</a> <a href="#fnref:36" class="footnote-back-ref">↩</a></p></li> <li id="fn:37"><p>"Skype 8.150.0.125". APKMirror. 2025-05-05. Retrieved 2025-05-06. <a href="https://www.apkmirror.com/apk/skype/skype-skype/skype-8-150-0-125-release/" target="_blank">https://www.apkmirror.com/apk/skype/skype-skype/skype-8-150-0-125-release/</a> <a href="#fnref:37" class="footnote-back-ref">↩</a></p></li> <li id="fn:38"><p>"Release Notes for Skype on Mobile". Skype Support. Retrieved 2025-05-06. <a href="https://support.microsoft.com/en-us/skype/what-s-new-in-skype-on-mobile-9e8b3dfe-5254-40fc-b1bf-b5b35f156c1b" target="_blank">https://support.microsoft.com/en-us/skype/what-s-new-in-skype-on-mobile-9e8b3dfe-5254-40fc-b1bf-b5b35f156c1b</a> <a href="#fnref:38" class="footnote-back-ref">↩</a></p></li> <li id="fn:39"><p>"Skype". App Store. Retrieved 2025-05-06. <a href="https://apps.apple.com/app/id304878510" target="_blank">https://apps.apple.com/app/id304878510</a> <a href="#fnref:39" class="footnote-back-ref">↩</a></p></li> <li id="fn:40"><p>"New TeamSpeak3 Client and Server released today". TeamSpeak Systems GmbH. Retrieved 2015-08-04. <a href="http://www.teamspeak.com/?page=newsarchive&ident=20130304" target="_blank">http://www.teamspeak.com/?page=newsarchive&ident=20130304</a> <a href="#fnref:40" class="footnote-back-ref">↩</a></p></li> <li id="fn:41"><p>"TeamViewer overview". GetApp. <a href="http://www.getapp.com/teamviewer-application#overview" target="_blank">http://www.getapp.com/teamviewer-application#overview</a> <a href="#fnref:41" class="footnote-back-ref">↩</a></p></li> <li id="fn:42"><p>"[Windows] v15.65.4". TeamViewer Community. 2025-04-29. Retrieved 2025-05-07. <a href="https://community.teamviewer.com/English/discussion/140812/windows-v15-65-4" target="_blank">https://community.teamviewer.com/English/discussion/140812/windows-v15-65-4</a> <a href="#fnref:42" class="footnote-back-ref">↩</a></p></li> <li id="fn:43"><p>"[macOS] v15.65.4". TeamViewer Community. 2025-04-29. Retrieved 2025-05-07. <a href="https://community.teamviewer.com/English/discussion/140807/macos-v-15-65-4" target="_blank">https://community.teamviewer.com/English/discussion/140807/macos-v-15-65-4</a> <a href="#fnref:43" class="footnote-back-ref">↩</a></p></li> <li id="fn:44"><p>"[Linux] v15.65.4". TeamViewer Community. 2025-04-29. Retrieved 2025-05-07. <a href="https://community.teamviewer.com/English/discussion/140806/linux-v15-65-4" target="_blank">https://community.teamviewer.com/English/discussion/140806/linux-v15-65-4</a> <a href="#fnref:44" class="footnote-back-ref">↩</a></p></li> <li id="fn:45"><p>"[Android] QuickSupport v15.65.712". TeamViewer Community. 2025-04-29. Retrieved 2025-05-07. <a href="https://community.teamviewer.com/English/discussion/140788/android-remote-control-v15-65-712" target="_blank">https://community.teamviewer.com/English/discussion/140788/android-remote-control-v15-65-712</a> <a href="#fnref:45" class="footnote-back-ref">↩</a></p></li> <li id="fn:46"><p>"TeamViewer Remote Control". Google Play. Retrieved 2025-05-07. <a href="https://play.google.com/store/apps/details?id=com.teamviewer.teamviewer.market.mobile" target="_blank">https://play.google.com/store/apps/details?id=com.teamviewer.teamviewer.market.mobile</a> <a href="#fnref:46" class="footnote-back-ref">↩</a></p></li> <li id="fn:47"><p>"TeamViewer Remote Control 15.65.712". APKMirror. Retrieved 2025-05-07. <a href="https://www.apkmirror.com/apk/teamviewer/teamviewer-for-remote-control/teamviewer-remote-control-15-65-712-release/" target="_blank">https://www.apkmirror.com/apk/teamviewer/teamviewer-for-remote-control/teamviewer-remote-control-15-65-712-release/</a> <a href="#fnref:47" class="footnote-back-ref">↩</a></p></li> <li id="fn:48"><p>"[iOS] Remote Control v15.65.1". TeamViewer Community. 2025-04-29. Retrieved 2025-05-07. <a href="https://community.teamviewer.com/English/discussion/140784/ios-remote-control-v15-65-1" target="_blank">https://community.teamviewer.com/English/discussion/140784/ios-remote-control-v15-65-1</a> <a href="#fnref:48" class="footnote-back-ref">↩</a></p></li> <li id="fn:49"><p>"TeamViewer Remote Control". App Store. Retrieved 2025-05-07. <a href="https://apps.apple.com/us/app/teamviewer-remote-control/id692035811" target="_blank">https://apps.apple.com/us/app/teamviewer-remote-control/id692035811</a> <a href="#fnref:49" class="footnote-back-ref">↩</a></p></li> <li id="fn:50"><p>"TeamViewer Remote". Microsoft Apps. Retrieved 2025-05-07. <a href="https://apps.microsoft.com/detail/xpdm17hk323c4x" target="_blank">https://apps.microsoft.com/detail/xpdm17hk323c4x</a> <a href="#fnref:50" class="footnote-back-ref">↩</a></p></li> <li id="fn:51"><p>Viber must be first installed on a mobile phone to function on a desktop operating system[44][45] <a href="#fnref:51" class="footnote-back-ref">↩</a></p></li> <li id="fn:52"><p>Viber must be first installed on a mobile phone to function on a desktop operating system[44][45] <a href="#fnref:52" class="footnote-back-ref">↩</a></p></li> <li id="fn:53"><p>Viber must be first installed on a mobile phone to function on a desktop operating system[44][45] <a href="#fnref:53" class="footnote-back-ref">↩</a></p></li> <li id="fn:54"><p>Lunden, Ingrid (19 April 2016). "Viber adds end-to-end encryption and hidden chats as the messaging app privacy wave grows". TechCrunch. AOL Inc. Retrieved 12 July 2016. <a href="https://techcrunch.com/2016/04/19/viber-adds-end-to-end-encryption-hidden-chats-universal-delete-as-messaging-app-privacy-grows/" target="_blank">https://techcrunch.com/2016/04/19/viber-adds-end-to-end-encryption-hidden-chats-universal-delete-as-messaging-app-privacy-grows/</a> <a href="#fnref:54" class="footnote-back-ref">↩</a></p></li> <li id="fn:55"><p>"Android: Viber - Safe Chats And Calls 20.4.3.0". 2 July 2023. Retrieved 7 July 2023. <a href="https://www.apkmirror.com/apk/viber-media-s-a-r-l/viber/viber-20-4-3-0-release/" target="_blank">https://www.apkmirror.com/apk/viber-media-s-a-r-l/viber/viber-20-4-3-0-release/</a> <a href="#fnref:55" class="footnote-back-ref">↩</a></p></li> <li id="fn:56"><p>"iOS: Version History 20.4.0 Jul 4, 2023". 4 July 2023. Retrieved 7 July 2023. <a href="https://apps.apple.com/app/id382617920?mt=8" target="_blank">https://apps.apple.com/app/id382617920?mt=8</a> <a href="#fnref:56" class="footnote-back-ref">↩</a></p></li> <li id="fn:57"><p>"Viber for MacV 20.2.0". 12 June 2023. Retrieved 7 July 2023. <a href="https://filehippo.com/mac/download_viber-for-mac/" target="_blank">https://filehippo.com/mac/download_viber-for-mac/</a> <a href="#fnref:57" class="footnote-back-ref">↩</a></p></li> <li id="fn:58"><p>"Viber for MacV 20.2.0". 12 June 2023. Retrieved 7 July 2023. <a href="https://filehippo.com/mac/download_viber-for-mac/" target="_blank">https://filehippo.com/mac/download_viber-for-mac/</a> <a href="#fnref:58" class="footnote-back-ref">↩</a></p></li> <li id="fn:59"><p>"viber.rpm". 14 June 2023. Retrieved 7 July 2023. <a href="https://download.cdn.viber.com/desktop/Linux/viber.rpm" target="_blank">https://download.cdn.viber.com/desktop/Linux/viber.rpm</a> <a href="#fnref:59" class="footnote-back-ref">↩</a></p></li> <li id="fn:60"><p>"Wire Security Whitepaper". Wire Swiss GmbH. Retrieved 13 April 2016.[permanent dead link] <a href="https://wire.com/resource/Wire%20Security%20Whitepaper/download/" target="_blank">https://wire.com/resource/Wire%20Security%20Whitepaper/download/</a> <a href="#fnref:60" class="footnote-back-ref">↩</a></p></li> <li id="fn:61"><p>"Wire on Twitter". Twitter. Retrieved 2017-02-28. <a href="https://twitter.com/wire/status/808392988665712644" target="_blank">https://twitter.com/wire/status/808392988665712644</a> <a href="#fnref:61" class="footnote-back-ref">↩</a></p></li> <li id="fn:62"><p>[1] Jami downloads <a href="https://jami.net/download/" target="_blank">https://jami.net/download/</a> <a href="#fnref:62" class="footnote-back-ref">↩</a></p></li> <li id="fn:63"><p>Marlinspike, Moxie (14 February 2017). "Video calls for Signal now in public beta". Open Whisper Systems. Retrieved 22 March 2017. <a href="https://whispersystems.org/blog/signal-video-calls-beta/" target="_blank">https://whispersystems.org/blog/signal-video-calls-beta/</a> <a href="#fnref:63" class="footnote-back-ref">↩</a></p></li> <li id="fn:64"><p>Marlinspike, Moxie (14 February 2017). "Video calls for Signal now in public beta". Open Whisper Systems. Retrieved 22 March 2017. <a href="https://whispersystems.org/blog/signal-video-calls-beta/" target="_blank">https://whispersystems.org/blog/signal-video-calls-beta/</a> <a href="#fnref:64" class="footnote-back-ref">↩</a></p></li> <li id="fn:65"><p>Marlinspike, Moxie (14 February 2017). "Video calls for Signal now in public beta". Open Whisper Systems. Retrieved 22 March 2017. <a href="https://whispersystems.org/blog/signal-video-calls-beta/" target="_blank">https://whispersystems.org/blog/signal-video-calls-beta/</a> <a href="#fnref:65" class="footnote-back-ref">↩</a></p></li> <li id="fn:66"><p>Marlinspike, Moxie (13 March 2017). "Video calls for Signal out of beta". Open Whisper Systems. Retrieved 22 March 2017. <a href="https://whispersystems.org/blog/signal-video-calls/" target="_blank">https://whispersystems.org/blog/signal-video-calls/</a> <a href="#fnref:66" class="footnote-back-ref">↩</a></p></li> <li id="fn:67"><p>Marlinspike, Moxie (13 March 2017). "Video calls for Signal out of beta". Open Whisper Systems. Retrieved 22 March 2017. <a href="https://whispersystems.org/blog/signal-video-calls/" target="_blank">https://whispersystems.org/blog/signal-video-calls/</a> <a href="#fnref:67" class="footnote-back-ref">↩</a></p></li> <li id="fn:68"><p>Marlinspike, Moxie (21 December 2016). "Doodles, stickers, and censorship circumvention for Signal Android". Open Whisper Systems. Retrieved 22 March 2017. <a href="https://whispersystems.org/blog/doodles-stickers-censorship/" target="_blank">https://whispersystems.org/blog/doodles-stickers-censorship/</a> <a href="#fnref:68" class="footnote-back-ref">↩</a></p></li> <li id="fn:69"><p>Marlinspike, Moxie (1 November 2016). "Signal and GIPHY". Open Whisper Systems. Retrieved 22 March 2017. <a href="https://whispersystems.org/blog/giphy-experiment/" target="_blank">https://whispersystems.org/blog/giphy-experiment/</a> <a href="#fnref:69" class="footnote-back-ref">↩</a></p></li> <li id="fn:70"><p>"WhatsApp Encryption Overview – Technical white paper" (PDF). WhatsApp Inc. 4 April 2016. Retrieved 9 April 2016. <a href="https://www.whatsapp.com/security/WhatsApp-Security-Whitepaper.pdf" target="_blank">https://www.whatsapp.com/security/WhatsApp-Security-Whitepaper.pdf</a> <a href="#fnref:70" class="footnote-back-ref">↩</a></p></li> <li id="fn:71"><p>"WhatsApp Messenger". 25 February 2025. Retrieved 28 February 2025. <a href="https://apps.apple.com/us/app/whatsapp-messenger/id310633997" target="_blank">https://apps.apple.com/us/app/whatsapp-messenger/id310633997</a> <a href="#fnref:71" class="footnote-back-ref">↩</a></p></li> <li id="fn:72"><p>"WhatsApp Messenger". 20 March 2025. Retrieved 17 March 2025. <a href="https://play.google.com/store/apps/details?id=com.whatsapp" target="_blank">https://play.google.com/store/apps/details?id=com.whatsapp</a> <a href="#fnref:72" class="footnote-back-ref">↩</a></p></li> <li id="fn:73"><p>"WhatsApp Win Uptodown Repo". 20 January 2025. Retrieved 23 January 2025. <a href="https://whatsapp-desktop.en.uptodown.com/windows" target="_blank">https://whatsapp-desktop.en.uptodown.com/windows</a> <a href="#fnref:73" class="footnote-back-ref">↩</a></p></li> <li id="fn:74"><p>"WhatsApp Messenger". 25 February 2025. Retrieved 28 February 2025. <a href="https://apps.apple.com/us/app/whatsapp-messenger/id310633997" target="_blank">https://apps.apple.com/us/app/whatsapp-messenger/id310633997</a> <a href="#fnref:74" class="footnote-back-ref">↩</a></p></li> <li id="fn:75"><p>"Licensing". Asterisk. Archived from the original on January 17, 2021. Retrieved February 18, 2022. <a href="https://www.asterisk.org/products/software/licensing/" target="_blank">https://www.asterisk.org/products/software/licensing/</a> <a href="#fnref:75" class="footnote-back-ref">↩</a></p></li> <li id="fn:76"><p>"ChangeLog-21-current". Retrieved 22 May 2024. <a href="https://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-21-current.md" target="_blank">https://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-21-current.md</a> <a href="#fnref:76" class="footnote-back-ref">↩</a></p></li> <li id="fn:77"><p>"ChangeLog-20-current". Retrieved 27 Oct 2023. <a href="https://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-20-current.md" target="_blank">https://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-20-current.md</a> <a href="#fnref:77" class="footnote-back-ref">↩</a></p></li> <li id="fn:78"><p>"ChangeLog-19-current". Retrieved 27 Oct 2023. <a href="https://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-19-current.md" target="_blank">https://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-19-current.md</a> <a href="#fnref:78" class="footnote-back-ref">↩</a></p></li> <li id="fn:79"><p>"ChangeLog-18-current". Retrieved 27 Oct 2023. <a href="https://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-18-current.md" target="_blank">https://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-18-current.md</a> <a href="#fnref:79" class="footnote-back-ref">↩</a></p></li> <li id="fn:80"><p>"Releases - signalwire/freeswitch". Retrieved 4 March 2024 – via GitHub. <a href="https://github.com/signalwire/freeswitch/releases" target="_blank">https://github.com/signalwire/freeswitch/releases</a> <a href="#fnref:80" class="footnote-back-ref">↩</a></p></li> <li id="fn:81"><p>End-to-end authentication protects communications from man-in-the-middle attacks by the service provider. <a href="#fnref:81" class="footnote-back-ref">↩</a></p></li> <li id="fn:82"><p>"Secure Messaging Scorecard. Which apps and tools actually keep your messages safe?". Electronic Frontier Foundation. 4 November 2014. Retrieved 11 July 2016. <a href="https://www.eff.org/node/82654" target="_blank">https://www.eff.org/node/82654</a> <a href="#fnref:82" class="footnote-back-ref">↩</a></p></li> <li id="fn:83"><p>"FaceTime security". Apple Support. Retrieved 2025-02-08. <a href="https://support.apple.com/en-gb/guide/security/seca331c55cd/1/web/1" target="_blank">https://support.apple.com/en-gb/guide/security/seca331c55cd/1/web/1</a> <a href="#fnref:83" class="footnote-back-ref">↩</a></p></li> <li id="fn:84"><p>"FaceTime security". Apple Support. Retrieved 2025-02-08. <a href="https://support.apple.com/en-gb/guide/security/seca331c55cd/1/web/1" target="_blank">https://support.apple.com/en-gb/guide/security/seca331c55cd/1/web/1</a> <a href="#fnref:84" class="footnote-back-ref">↩</a></p></li> <li id="fn:85"><p>Only if the user has registered with a compatible SIP provider. Some SIP providers do not support certain encryption protocols. <a href="#fnref:85" class="footnote-back-ref">↩</a></p></li> <li id="fn:86"><p>"Secure Messaging Scorecard. Which apps and tools actually keep your messages safe?". Electronic Frontier Foundation. 4 November 2014. Retrieved 11 July 2016. <a href="https://www.eff.org/node/82654" target="_blank">https://www.eff.org/node/82654</a> <a href="#fnref:86" class="footnote-back-ref">↩</a></p></li> <li id="fn:87"><p>"Secure Messaging Scorecard. Which apps and tools actually keep your messages safe?". Electronic Frontier Foundation. 4 November 2014. Retrieved 11 July 2016. <a href="https://www.eff.org/node/82654" target="_blank">https://www.eff.org/node/82654</a> <a href="#fnref:87" class="footnote-back-ref">↩</a></p></li> <li id="fn:88"><p>""Letter Sealing" End-to-End Encryption Indicator Icon Introduced to LINE Messaging App". Line Corporation. 10 August 2016. Retrieved 29 September 2016. <a href="https://linecorp.com/en/pr/news/en/2016/1464" target="_blank">https://linecorp.com/en/pr/news/en/2016/1464</a> <a href="#fnref:88" class="footnote-back-ref">↩</a></p></li> <li id="fn:89"><p>Shin, Ki Bin (11 August 2016). "The next step for even safer messaging: Letter Sealing". Line Corporation. Archived from the original on 2 October 2016. Retrieved 30 September 2016. <a href="https://web.archive.org/web/20161002044533/http://developers.linecorp.com/blog/?p=3938" target="_blank">https://web.archive.org/web/20161002044533/http://developers.linecorp.com/blog/?p=3938</a> <a href="#fnref:89" class="footnote-back-ref">↩</a></p></li> <li id="fn:90"><p>""Letter Sealing" End-to-End Encryption Indicator Icon Introduced to LINE Messaging App". Line Corporation. 10 August 2016. Retrieved 29 September 2016. <a href="https://linecorp.com/en/pr/news/en/2016/1464" target="_blank">https://linecorp.com/en/pr/news/en/2016/1464</a> <a href="#fnref:90" class="footnote-back-ref">↩</a></p></li> <li id="fn:91"><p>Only if the user has registered with a compatible SIP provider. Some SIP providers do not support certain encryption protocols. <a href="#fnref:91" class="footnote-back-ref">↩</a></p></li> <li id="fn:92"><p>"Secure Messaging Scorecard. Which apps and tools actually keep your messages safe?". Electronic Frontier Foundation. 4 November 2014. Retrieved 11 July 2016. <a href="https://www.eff.org/node/82654" target="_blank">https://www.eff.org/node/82654</a> <a href="#fnref:92" class="footnote-back-ref">↩</a></p></li> <li id="fn:93"><p>"Secure Messaging Scorecard. Which apps and tools actually keep your messages safe?". Electronic Frontier Foundation. 4 November 2014. Retrieved 11 July 2016. <a href="https://www.eff.org/node/82654" target="_blank">https://www.eff.org/node/82654</a> <a href="#fnref:93" class="footnote-back-ref">↩</a></p></li> <li id="fn:94"><p>Marlinspike, Moxie (13 March 2017). "Video calls for Signal out of beta". Open Whisper Systems. Retrieved 30 March 2017. <a href="https://whispersystems.org/blog/signal-video-calls/" target="_blank">https://whispersystems.org/blog/signal-video-calls/</a> <a href="#fnref:94" class="footnote-back-ref">↩</a></p></li> <li id="fn:95"><p>"What are Skype Private Conversations?". Skype. Microsoft. Retrieved 24 May 2020. Note: Private conversations can only be accessed on one device at a time. <a href="https://support.skype.com/en/faq/FA34824/what-are-skype-private-conversations" target="_blank">https://support.skype.com/en/faq/FA34824/what-are-skype-private-conversations</a> <a href="#fnref:95" class="footnote-back-ref">↩</a></p></li> <li id="fn:96"><p>"What are Skype Private Conversations? --(private conversations white paper)--> Skype Private Conversation Technical white paper". Microsoft. Retrieved 24 May 2020. Users can verify the security of their conversations by checking the key setup between two users. <a href="https://support.skype.com/en/faq/FA34824/what-are-skype-private-conversations" target="_blank">https://support.skype.com/en/faq/FA34824/what-are-skype-private-conversations</a> <a href="#fnref:96" class="footnote-back-ref">↩</a></p></li> <li id="fn:97"><p>"What are Skype Private Conversations? --(private conversations white paper)--> Skype Private Conversation Technical white paper". Microsoft. Retrieved 24 May 2020. Caller encrypts the SRTP using the generated encryption key, which can only be decrypted by the callee. After the call is setup, the media packets are encrypted using the SRTP keys. <a href="https://support.skype.com/en/faq/FA34824/what-are-skype-private-conversations" target="_blank">https://support.skype.com/en/faq/FA34824/what-are-skype-private-conversations</a> <a href="#fnref:97" class="footnote-back-ref">↩</a></p></li> <li id="fn:98"><p>"Voice Calls: Secure, Crystal-Clear, AI-Powered". Telegram. 30 March 2017. Retrieved 30 March 2017. <a href="https://telegram.org/blog/calls" target="_blank">https://telegram.org/blog/calls</a> <a href="#fnref:98" class="footnote-back-ref">↩</a></p></li> <li id="fn:99"><p>Only the encryption related source code is open. <a href="#fnref:99" class="footnote-back-ref">↩</a></p></li> <li id="fn:100"><p>"Where can I find Threema's source code?". threema.ch. Threema. n.d. Retrieved 30 October 2017. <a href="https://threema.ch/en/faq/source_code" target="_blank">https://threema.ch/en/faq/source_code</a> <a href="#fnref:100" class="footnote-back-ref">↩</a></p></li> <li id="fn:101"><p>"Threema cryptography whitepaper" (PDF). threema.ch. Threema. n.d. Retrieved 30 October 2017. <a href="https://threema.ch/press-files/2_documentation/cryptography_whitepaper.pdf" target="_blank">https://threema.ch/press-files/2_documentation/cryptography_whitepaper.pdf</a> <a href="#fnref:101" class="footnote-back-ref">↩</a></p></li> <li id="fn:102"><p>"Threema cryptography whitepaper" (PDF). threema.ch. Threema. n.d. Retrieved 30 October 2017. <a href="https://threema.ch/press-files/2_documentation/cryptography_whitepaper.pdf" target="_blank">https://threema.ch/press-files/2_documentation/cryptography_whitepaper.pdf</a> <a href="#fnref:102" class="footnote-back-ref">↩</a></p></li> <li id="fn:103"><p>"Threema cryptography whitepaper" (PDF). threema.ch. Threema. n.d. Retrieved 30 October 2017. <a href="https://threema.ch/press-files/2_documentation/cryptography_whitepaper.pdf" target="_blank">https://threema.ch/press-files/2_documentation/cryptography_whitepaper.pdf</a> <a href="#fnref:103" class="footnote-back-ref">↩</a></p></li> <li id="fn:104"><p>"Threema cryptography whitepaper" (PDF). threema.ch. Threema. n.d. Retrieved 30 October 2017. <a href="https://threema.ch/press-files/2_documentation/cryptography_whitepaper.pdf" target="_blank">https://threema.ch/press-files/2_documentation/cryptography_whitepaper.pdf</a> <a href="#fnref:104" class="footnote-back-ref">↩</a></p></li> <li id="fn:105"><p>Only on the network connection, not on the end-to-end layer. <a href="#fnref:105" class="footnote-back-ref">↩</a></p></li> <li id="fn:106"><p>"Threema cryptography whitepaper" (PDF). threema.ch. Threema. n.d. Retrieved 30 October 2017. <a href="https://threema.ch/press-files/2_documentation/cryptography_whitepaper.pdf" target="_blank">https://threema.ch/press-files/2_documentation/cryptography_whitepaper.pdf</a> <a href="#fnref:106" class="footnote-back-ref">↩</a></p></li> <li id="fn:107"><p>Lunden, Ingrid (19 April 2016). "Viber adds end-to-end encryption and hidden chats as the messaging app privacy wave grows". TechCrunch. AOL Inc. Retrieved 12 July 2016. <a href="https://techcrunch.com/2016/04/19/viber-adds-end-to-end-encryption-hidden-chats-universal-delete-as-messaging-app-privacy-grows/" target="_blank">https://techcrunch.com/2016/04/19/viber-adds-end-to-end-encryption-hidden-chats-universal-delete-as-messaging-app-privacy-grows/</a> <a href="#fnref:107" class="footnote-back-ref">↩</a></p></li> <li id="fn:108"><p>Only the encryption related source code is open. <a href="#fnref:108" class="footnote-back-ref">↩</a></p></li> <li id="fn:109"><p>"WhatsApp Encryption Overview – Technical white paper" (PDF). WhatsApp Inc. 4 April 2016. Retrieved 5 April 2016. <a href="https://www.whatsapp.com/security/WhatsApp-Security-Whitepaper.pdf" target="_blank">https://www.whatsapp.com/security/WhatsApp-Security-Whitepaper.pdf</a> <a href="#fnref:109" class="footnote-back-ref">↩</a></p></li> <li id="fn:110"><p>"WhatsApp Encryption Overview – Technical white paper" (PDF). WhatsApp Inc. 4 April 2016. Retrieved 5 April 2016. <a href="https://www.whatsapp.com/security/WhatsApp-Security-Whitepaper.pdf" target="_blank">https://www.whatsapp.com/security/WhatsApp-Security-Whitepaper.pdf</a> <a href="#fnref:110" class="footnote-back-ref">↩</a></p></li> <li id="fn:111"><p>"WhatsApp Encryption Overview – Technical white paper" (PDF). WhatsApp Inc. 4 April 2016. Retrieved 5 April 2016. <a href="https://www.whatsapp.com/security/WhatsApp-Security-Whitepaper.pdf" target="_blank">https://www.whatsapp.com/security/WhatsApp-Security-Whitepaper.pdf</a> <a href="#fnref:111" class="footnote-back-ref">↩</a></p></li> <li id="fn:112"><p>"WhatsApp Encryption Overview – Technical white paper" (PDF). WhatsApp Inc. 4 April 2016. Retrieved 5 April 2016. <a href="https://www.whatsapp.com/security/WhatsApp-Security-Whitepaper.pdf" target="_blank">https://www.whatsapp.com/security/WhatsApp-Security-Whitepaper.pdf</a> <a href="#fnref:112" class="footnote-back-ref">↩</a></p></li> <li id="fn:113"><p>"WhatsApp Encryption Overview – Technical white paper" (PDF). WhatsApp Inc. 4 April 2016. Retrieved 5 April 2016. <a href="https://www.whatsapp.com/security/WhatsApp-Security-Whitepaper.pdf" target="_blank">https://www.whatsapp.com/security/WhatsApp-Security-Whitepaper.pdf</a> <a href="#fnref:113" class="footnote-back-ref">↩</a></p></li> <li id="fn:114"><p>"WhatsApp Encryption Overview – Technical white paper" (PDF). WhatsApp Inc. 4 April 2016. Retrieved 5 April 2016. <a href="https://www.whatsapp.com/security/WhatsApp-Security-Whitepaper.pdf" target="_blank">https://www.whatsapp.com/security/WhatsApp-Security-Whitepaper.pdf</a> <a href="#fnref:114" class="footnote-back-ref">↩</a></p></li> <li id="fn:115"><p>"WhatsApp Encryption Overview – Technical white paper" (PDF). WhatsApp Inc. 4 April 2016. Retrieved 5 April 2016. <a href="https://www.whatsapp.com/security/WhatsApp-Security-Whitepaper.pdf" target="_blank">https://www.whatsapp.com/security/WhatsApp-Security-Whitepaper.pdf</a> <a href="#fnref:115" class="footnote-back-ref">↩</a></p></li> <li id="fn:116"><p>"A major upgrade to calling". Medium. Wire Swiss GmbH. 14 March 2017. Retrieved 14 March 2017. <a href="https://medium.com/wire-news/a-major-upgrade-to-calling-9ac8780741a1#.5jt0cku16" target="_blank">https://medium.com/wire-news/a-major-upgrade-to-calling-9ac8780741a1#.5jt0cku16</a> <a href="#fnref:116" class="footnote-back-ref">↩</a></p></li> <li id="fn:117"><p>"Wire Security Whitepaper". Wire Swiss GmbH. Retrieved 13 April 2016.[permanent dead link] <a href="https://wire.com/resource/Wire%20Security%20Whitepaper/download/" target="_blank">https://wire.com/resource/Wire%20Security%20Whitepaper/download/</a> <a href="#fnref:117" class="footnote-back-ref">↩</a></p></li> <li id="fn:118"><p>"Wire Security Whitepaper". Wire Swiss GmbH. Retrieved 13 April 2016.[permanent dead link] <a href="https://wire.com/resource/Wire%20Security%20Whitepaper/download/" target="_blank">https://wire.com/resource/Wire%20Security%20Whitepaper/download/</a> <a href="#fnref:118" class="footnote-back-ref">↩</a></p></li> <li id="fn:119"><p>"Security & Privacy". Wire. Retrieved 19 January 2020. New encryption keys are used for each message, so a compromised key has minimal impact. <a href="https://wire.com/en/security/" target="_blank">https://wire.com/en/security/</a> <a href="#fnref:119" class="footnote-back-ref">↩</a></p></li> <li id="fn:120"><p>"Is Zfone open source?". zfoneproject.com. Zfone. 2006. Retrieved 26 August 2016. <a href="http://zfoneproject.com/faq.html#opensource" target="_blank">http://zfoneproject.com/faq.html#opensource</a> <a href="#fnref:120" class="footnote-back-ref">↩</a></p></li> <li id="fn:121"><p>"Do you support Elliptic Curve Diffie-Hellman?". zfoneproject.com. Zfone. 2006. Retrieved 26 August 2016. <a href="http://zfoneproject.com/faq.html#suiteb" target="_blank">http://zfoneproject.com/faq.html#suiteb</a> <a href="#fnref:121" class="footnote-back-ref">↩</a></p></li> <li id="fn:122"><p>"Why do we need ZRTP if we already have SRTP? Isn't SRTP good enough?". zfoneproject.com. Zfone. 2006. Retrieved 26 August 2016. <a href="http://zfoneproject.com/faq.html#srtp" target="_blank">http://zfoneproject.com/faq.html#srtp</a> <a href="#fnref:122" class="footnote-back-ref">↩</a></p></li> </ol>