Comparison of VoIP software

! Operating systems

! License

! Costs

! Protocols

! Codecs

! Encryption

! Max conference peers

! Other abilities

! Latest release

| Linux, macOS, Windows

| {{some|Mixed: free software versions under GNU GPLv3 + shareware versions under gplv3 with exception of including proprietary code}}

| macOS version proprietary on App Store, free version limited to sponsored SIP provider; Windows version proprietary; Linux version open source

| ICE, SIP, MSRP, RFB (VNC), XCAP

| Opus, speex, G.722, GSM, iLBC, PCMU, PCMA

| {{Yes|TLS, SRTP and ZRTP on all versions, OTR/SMP on Linux and macOS only{{cite web|title=Download Blink|url=http://icanblink.com/download/|website=Blink Project's Website|date=14 January 2016|access-date=22 June 2016}}}}

| No limit

| IM, file transfer, desktop sharing, multi-party conference, wideband

| Blink Qt

| macOS, Android, iOS, Windows

| {{proprietary}}

| {{free}}

| {{Unk}}

| {{Unk}}

| {{Unk}}

| {{Unk}}

| IM, multi-party conference

| {{Unk}}

| macOS, Android, iOS, Windows, Linux

| {{proprietary}}

| {{free}}, Premium "Nitro" Subscription for Additional Features.

| RTP, UDP, WS, HTTPS

| Opus

|{{Yes|TLS}}

|5000 soft limit for voice calls,{{Cite news|url=https://twitter.com/discordapp/status/814546030612148224|title=Discord on Twitter|newspaper=Twitter|access-date=2016-12-29}} 25 hard limit for video{{cite web|url=https://blog.discord.com/wave-hello-to-server-video-85dcef1128f0|title=Wave Hello to Server Video|access-date=2020-06-21}}

|IM, file sharing, desktop sharing, in-game overlay

|10.0.19045; {{Start date and age|2024|12|19}}

| Windows

| {{proprietary}}

| {{free}}

| SIP, STUN, ICE, XMPP

| {{Unk}}

| {{Yes}}

| 5{{usurped|1=[https://web.archive.org/web/20090321090148/http://eyeballchat.com/ eyeballchat.com]}}. EyeballChat.com.

| IM, Conferencing, Voice, Video and SIMPLE based presence

| Windows 3.2; {{Start date and age|2009}}

| iOS, macOS

| {{proprietary}}

| {{Free}}

| SIP, IETF, Signaling protocol for VoIP, STUN, TURN and ICE| IETF, technologies for traversing firewalls and NAT

| H.264 Video, AAC-ELD Audio, H.263 and VP8

| RTP, SRTP IETF|standards for delivering real-time and encrypted media streams for VoIP.

| 20

| Video, voice, conferencing, with additional tools available as "Services".

|

| Linux, macOS, Windows, mobile

| {{proprietary}}

| {{dunno}}

| SIP-SIMPLE, T.120

| H.323

| {{Yes|TLS}}

| {{Unk}}

| IM, File transfer, Voice, Presence, Server stored contact list, HTTP tunneling, plugins, embedable in Lotus Notes[http://www-01.ibm.com/software/lotus/products/sametime/telephony.html "Telephony with Lotus Sametime software"]. IBM.com. Retrieved 2010-02-16

| 8.5.2; {{Start date and age|2011|05|08}}

| Android, FreeBSD, iOS, iPhone, Linux, Microsoft Windows, OS X{{Cite web|url=https://ring.cx/en/news|title=News|date=2018-07-25|website=Ring|language=en|access-date=2018-12-01|archive-url=https://web.archive.org/web/20181226012459/https://ring.cx/en/news|archive-date=2018-12-26|url-status=dead}}

| {{open source|GPL-3.0-or-later}}

| {{free}}

| SIP, RTP, STUN per account, SRV, DHT, P2P

| Audio: Opus, Speex, G.722, G.711, GSM, VP8, G.729, iLBC. Video: H.264, H.263, VP8, MPEG-4

| {{Yes|Voice encryption (SRTP with SDES or ZRTP) and signaling encryption (TLS), multiple realms authentication mechanism }}

| No limit

| Blockchain ID-management, Gnome-KDE client, address book, multiple accounts, unlimited call number, call transfer, call hold-unhold, call recording, multi-way conferencing

| {{Latest_stable_software_release/Ring_(software)}}

| Linux, macOS, Windows (all java supported). Experimental Android builds are also available.{{cite web|url=https://download.jitsi.org/jitsi/nightly/android/|title=Jitsi (SIP Communicator) Android — Nightly Builds Index|publisher=Jitsi.org|access-date=2014-11-15|archive-url=https://web.archive.org/web/20141129035757/https://download.jitsi.org/jitsi/nightly/android/|archive-date=2014-11-29|url-status=dead}}

| {{open source|Apache-2.0}}

| {{free}}

| SIP-SIMPLE, XMPP-Jingle STUN ICE, TURN

| SILK, G.722, Speex, Opus, G.711 (PCMU/PCMA), iLBC, GSM, G.729, H.264, H.263, VP8

| {{Yes|ZRTP, SRTP, OTR, TLS}}

| {{Unk}}

| Text messaging, audio-video telephony, IPv6 (often broken,[http://www.internetsociety.org/deploy360/blog/2013/03/video-emil-ivov-about-jitsi-a-voip-softphone-supporting-ipv6-and-dnssec/ Interview with Emil Ivov], Deploy360 blog P2P not supported{{cite web |url=https://java.net/jira/browse/JITSI-1166 |title=[#JITSI-1166] P2P IPv6 calls still do not work with explicit IPv6 addresses, no matter if brackets are used — Java.net JIRA |publisher=Java.net |access-date=2014-02-13 |archive-url=https://web.archive.org/web/20140221210327/https://java.net/jira/browse/JITSI-1166 |archive-date=2014-02-21 |url-status=dead }}), call recording, 64-bit

| {{Latest stable software release/Jitsi}}

| Linux, Windows, macOS, Android, iPhone, BlackBerry

| {{open source|GPL-3.0-or-later}}

| {{free}}

| SIP

| Speex, Opus, G711, GSM, G.722, VP8 (WebM), H263, MPEG4, Theora and H264 (plugin)

| {{Yes|TLS, SRTP, ZRTP}}

| {{Unk}}

| Video, IM, STUN, IPv6 (disables IPv4 support when enabled), P2P, Secure Encryption, User own Encryption via Provided API https://gitlab.linphone.org/BC/public/linphone-desktop

| 4.2.5; {{Start date and age|2020|06|25}}, provides daily snapshots via http://www.linphone.org/snapshots

| macOS

| {{proprietary}}

| {{free}}, only macOS and iOS

| SIP AIM ICQ XMPP

| H263, H264

| {{Unk}}

| {{Unk}}

| Integrated, PBX independent

| 7.0; {{Start date and age|2012|07|25}}

| Windows

| {{open source|GPL-2.0-or-later}}

| {{free}}

| SIP, STUN, ICE, SIMPLE

| Speex, iLBC, GSM, G.711, G.722, G.729, SILK, Linear PCM

| {{Yes|TLS, SRTP}}

| {{Unk}}

| Video, voice, IM and Presence

| {{Latest stable software release/MicroSIP}}

| Any, Progressive web application

| {{open source|GPL-2.0-or-later}}

| {{free}}

| XMPP, STUN, TURN

| Depending the web-browser

| {{Yes|TLS}}

| 2

| IM, microblogging, social-network, OMEMO encryption, screen-sharing, file transfer

| {{wikidata|qualifier|raw|preferred|single|Q3326936|P348|P548=Q2804309|P577}}

| Linux, macOS, iOS, Windows, Android

| {{open source|New BSD license}}

| {{free}}

| ICE

| CELT, Speex, Opus

| {{Yes|TLS and OCB-AES128}}

| No limit (limited only by server bandwidth and memory)

|Chat with (limited) embedded HTML, Automatic Gain Control, very low latency, Access Control Lists 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

| 1.4.287; {{Start date and age|2022|09|14}}

| Windows, Android, iOS

| {{proprietary}}

| {{free}}

| SIP, RTP and RTCP

| {{Unk}}

| {{Yes}}

| No limit

|Address Book integration, Call recording/export, Mute, On Hold, Caller ID definition

| 4.2.9; {{Start date and age|2013|03}}

| Windows

| {{proprietary}}

| {{free}}

| SIP, TAPI, CAPI

| G.711a, G.711u, G.722, G.726, G.729, GSM, iLBC, speex, Opus

| {{Yes|TLS, SRTP, ZRTP}}

| 8

| Conferencing, call redirection, call recording

| {{Latest stable software release/Phoner}}

| Windows

| {{proprietary}}

| {{free}}

| SIP

| G.711a, G.711u, G.722, G.726, G.729, GSM, iLBC, speex, Opus

| {{Yes|TLS, SRTP, ZRTP}}

| 8

| Conferencing, call redirection, call recording

| {{Latest stable software release/PhonerLite}}

| Windows

| {{proprietary}}

| {{dunno}}

| Proprietary

| {{dunno}}

| {{dunno}}

| {{Unk}}

| {{dunno}}

| {{Start date and age|2001}}

| Linux, macOS, Windows, Android, iPhone

| {{open source|GPLv3 clients and AGPLv3 server}}

| {{free}}

|RingRTC (WebRTC over Signal protocol{{Cite web|url=https://signal.org/blog/signal-video-calls-beta/|title=Video calls for Signal now in public beta|date=2017-03-13|website=Signal|access-date=2020-03-02}})

|Opus

| {{Yes|TLS, Signal Protocol}}

| 50{{cite web |title=Group Calling - Voice or Video |website=Signal Support |url=https://support.signal.org/hc/en-us/articles/360052977792-Group-Calling-Voice-or-Video |access-date=18 December 2024}}

| 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.

| {{Multiple releases

| branch1 = Android

| version1 = {{wikidata|property|preferred|references|edit|Q19718090|P348|P400=Q94|P548=Q2804309}}

| date1 = {{wikidata|qualifier|preferred|single|Q19718090|P348|P400=Q94|P548=Q2804309|P577}}

| branch2 = iOS

| version2 = {{wikidata|property|preferred|references|edit|Q19718090|P348|P400=Q48493|P548=Q2804309}}

| date2 = {{wikidata|qualifier|preferred|single|Q19718090|P348|P400=Q48493|P548=Q2804309|P577}}

| branch3 = Desktop

| version3 = {{wikidata|property|preferred|references|edit|Q19718090|P348|P400=Q16338|P548=Q2804309}}

| date3 = {{wikidata|qualifier|preferred|single|Q19718090|P348|P400=Q16338|P548=Q2804309|P577}}

}}

| Linux(with limited functionality),{{Cite web|url=http://opensourceforu.com/2017/06/microsoft-retire-skype-linux-app-july-1/|title = Microsoft to retire Skype Linux app on July 1|date = 9 June 2017}} macOS, Windows 2000-XP-Vista-7-Mobile (unsupported), BREW, Windows Phone, Android, iPhone, PSP

| {{proprietary}}

| {{free}}

| Proprietary P2P protocol {{efn|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{{cite web|title=Skype Connect...|url=http://www.skype.com/en/features/skype-connect/|website=skype.com|publisher=Microsoft Corporation Inc.|access-date=15 November 2014|archive-url=https://web.archive.org/web/20141111022420/http://www.skype.com/en/features/skype-connect/|archive-date=2014-11-11}}}}

| SILK

| {{Yes|TLS}}

| 25 starting with version 3.6.0.216. 10 with 2.x

| Conferencing, video, file transfer, voicemail, Skype to phone, phone to Skype, additional P2P extensions (games, whiteboard, etc...); depending on platform.

| {{Latest stable software release/Skype}}

|Web, Phones, Desktop

| {{proprietary}}

|

|WebRTC

|

|

|

|

|

| Linux, Windows, macOS, FreeBSD, Android, iOS

| {{proprietary}}

| {{free}}

| {{Unk}}

| CELT, Speex (both until server version 3.5.0), Opus{{cite web|url=http://www.teamspeak.com/?page=newsarchive&ident=20130304 |title=New TeamSpeak3 Client and Server released today |publisher=TeamSpeak Systems GmbH |access-date=2015-08-04}}

| {{Yes}}

| 32 unlicensed, 512 with Non-Profit License (available until September 2018), up to 1024 (Gamer License), 2000

| 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

| 3.5.5; {{Start date and age|2020|11|04}}

| Linux, Windows, macOS, Android, iOS, Raspbian

| {{proprietary}}

| {{free}}

| {{proprietary}}

| Opus, Speex, VP8

| {{No}}

| 1000

| Video, file sharing, desktop sharing, stream media files (MP3, AVI)

| 5.3.3; {{Start date and age|2018|11}}

| Linux, Windows, macOS, iOS, Android{{cite web|title=TeamViewer overview|url=http://www.getapp.com/teamviewer-application#overview|publisher=GetApp}}

| {{proprietary}}

| {{free}} (personal use only)

| {{Unk}}

| {{Unk}}

| {{Yes|AES256}}

| {{Unk}}

| {{Unk}}

| {{Latest stable software release/TeamViewer}}

| macOS 10.10.2

| {{open source|BSD}}

| {{free}}

| SIP, STUN, ICE

| {{Unk}}

| {{No}}

| {{Unk}}

| Address Book integration

| 1.1.4; {{Start date and age|2012|03|06}}

| Android, iPhone, Windows Phone

| {{proprietary}}

| {{free}}

| WebRTC, SIP, XMPP

| iLBC, Opus

| Yes

| {{Unk}}

| Voice, video, Instant messaging, group chat, photo and video sharing, SMS and MMS, native and social network contacts integration, incoming call/IM push notifications.

|

| Linux

| {{open source|GPL-2.0-or-later}}

| {{free}}

| SIP

| G.711 A-law μ-law, G.726, GSM, iLBC, Speex narrow wide ultrawide

| {{Yes|SRTP, ZRTP}}

| 3

| Conferencing, chat, file transfer, Firefox integration, call redirection, voicemail, support of VoIP-to-Phone services

| {{Latest stable software release/Twinkle}}

| macOS, Windows, iOS, Android

| {{proprietary}}

| {{free}}

| {{Unk}}

| {{Unk}}

| {{No}}

| 8

| Conferencing, chat, text-to-speech

| 3.0.8

| Linux,{{efn|name=viber-desktop-restriction|Viber must be first installed on a mobile phone to function on a desktop operating system{{cite web|last1=Brad Chacos|first1=Brad|title=Hands on with Viber's new desktop app: It's no Skype|url=http://www.pcworld.com/article/2038073/hands-on-with-vibers-new-desktop-app-its-no-skype.html|website=www.pcworld.com|publisher=IDG Consumer & SMB|access-date=15 November 2014|archive-url=https://web.archive.org/web/20140725080804/http://www.pcworld.com/article/2038073/hands-on-with-vibers-new-desktop-app-its-no-skype.html|archive-date=2014-07-25|quote=If you don’t have Viber on your phone and try to install the service on your PC, the app will redirect you to its website and ask you to install Viber on your phone first.}}[https://blogs.wsj.com/digits/2013/05/07/viber-unveils-desktop-app/ Viber Unveils Desktop App]}} macOS,{{efn|name=viber-desktop-restriction}} Windows,{{efn|name=viber-desktop-restriction}} Android, Bada, BlackBerry OS, iOS, Series 40, Symbian, Windows Phone

| {{proprietary}}

| {{dunno}}

| {{Unk}}

| {{Unk}}

| {{Yes}}

| {{Unk}}

| Varies by platform: Text, picture and video messaging on all, voice calling only on iPhone, Android and Microsoft's Windows Phone

| {{Latest stable software release/Viber}}

| Linux, Windows, macOS, iOS, Android, Web

| {{open source|GPLv3}}

|not free

| {{dunno}}

| Audio: Opus

Video: VP8

| {{yes|DTLS, SRTP}}

| 10{{Cite news|url=https://twitter.com/wire/status/808392988665712644|title=Wire on Twitter|work=Twitter|access-date=2017-02-28|language=en}}

| 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)

| {{dunno}}

| Linux, macOS, Windows

| {{open source|GPL}}

| {{free}}

| SIP, IAX, XMPP, H.323

| G.711a, G.711u, GSM 06.10, iLBC, Speex, G.723, G.726, G.728, G.729

| {{Yes|SRTP, maybe ZRTP?}}

| {{Unk}}

|

| 6.0.0; {{Start date and age|2017|09}}

| Linux, macOS, Windows

| {{proprietary}} (with viewable source)

| {{free|Includes time bomb provision}}

| SIP, RTP

| {{Unk}}

| {{Yes|SRTP, ZRTP}}

| {{Unk}}

|

| Beta 2008-09-04 (Linux 0.9.224), (macOS 0.9.246), (Windows 0.9.206)

! Operating systems

! License

! Open source

! Protocols

! Codecs

! Encryption

! Other abilities

! Latest release

! Operating systems

! License

! Protocols, based on, compatible with

! Encryption

! Other abilities

! Key and target markets

! Latest release

! Operating systems

! License

! Protocols

! Encryption

! Notable features

! Target markets

! Latest release

! rowspan=2 | Development status

! rowspan=2 | Open source client

! rowspan=2 | End-to-end authenticationEnd-to-end authentication protects communications from man-in-the-middle attacks by the service provider.

! colspan=4 | Encryption protocols

! rowspan=2 | Forward secrecy

! rowspan=2 | Multiple encryption

! rowspan=2 | Encrypted group calling

! rowspan=2 | Proxy, Tor

! ECDH

! DTLS

! SRTP

| {{Active}}

| {{no}}{{cite web | url = https://www.eff.org/node/82654 | publisher = Electronic Frontier Foundation | title = Secure Messaging Scorecard. Which apps and tools actually keep your messages safe? | date = 4 November 2014 |access-date=11 July 2016}}

| {{yes}}{{Cite web |title=FaceTime security |url=https://support.apple.com/en-gb/guide/security/seca331c55cd/1/web/1 |access-date=2025-02-08 |website=Apple Support |language=en}}

| {{dunno}}

| {{dunno}}

| {{dunno}}

| {{yes}}

| {{yes}}

| {{dunno}}

| {{yes}}

| {{no}}

| {{Active}}

| {{yes}}

| {{yes}}

| {{no}}

| {{dunno}}

| {{yes}}

| {{yes}}

| {{yes}}

| {{dunno}}

| {{yes}}

| {{dunno}}

| {{Active}}

| {{yes}}

| {{yes}}

| {{yes}}

| {{no}}

| {{yes}}

| {{yes}}

| {{yes}}

| {{yes}}

| {{yes}}

| {{dunno}}

| {{Active}}

| {{no}}

| {{dunno}}

| {{dunno}}

| {{dunno}}

| {{dunno}}

| {{dunno}}

| {{dunno}}

| {{dunno}}

| {{no}}

| {{no}}

| {{Active}}

| {{yes}}

| {{yes}}

| {{no}}

| {{yes}}

| {{no}}

| {{yes}}

| {{yes}}

| {{yes}}

| {{yes}}

| {{depends}}{{cite web|last1=Marlinspike|first1=Moxie|title=Video calls for Signal out of beta|url=https://whispersystems.org/blog/signal-video-calls/|publisher=Open Whisper Systems|access-date=30 March 2017|date=13 March 2017}}

| {{Active}}

| {{no}}

| {{yes}}{{cite web |title=What are Skype Private Conversations? --(private conversations white paper)--> Skype Private Conversation Technical white paper |url=https://support.skype.com/en/faq/FA34824/what-are-skype-private-conversations |publisher=Microsoft |access-date=24 May 2020 |quote=Users can verify the security of their conversations by checking the key setup between two users.}}

| {{no}}

| {{no}}

| {{no}}

| {{yes}}{{cite web |title=What are Skype Private Conversations? --(private conversations white paper)--> Skype Private Conversation Technical white paper |url=https://support.skype.com/en/faq/FA34824/what-are-skype-private-conversations |publisher=Microsoft |access-date=24 May 2020 |quote=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.}}

| {{dunno}}

| {{dunno}}

| {{no}}

| {{no}}

| {{Active}}

| {{yes}}

| {{yes}}{{cite web|title=Voice Calls: Secure, Crystal-Clear, AI-Powered|url=https://telegram.org/blog/calls|publisher=Telegram|access-date=30 March 2017|date=30 March 2017}}

| {{no}}

| {{no}}

| {{no}}

| {{no}}

| {{yes}}

| {{dunno}}

| {{no}}

| {{no}}

| {{Active}}

| {{partial|Partially}}{{cite web|title=Where can I find Threema's source code?|url=https://threema.ch/en/faq/source_code|website=threema.ch|publisher=Threema|access-date=30 October 2017|date=n.d.}}

| {{yes}}{{cite web|title=Threema cryptography whitepaper|url=https://threema.ch/press-files/2_documentation/cryptography_whitepaper.pdf|website=threema.ch|publisher=Threema|access-date=30 October 2017|date=n.d.}}

| {{no}}

| {{yes}}

| {{yes}}

| {{yes}}

| {{partial|Partially}}Only on the network connection, not on the end-to-end layer.

| {{yes}}

| {{no}}

| {{no}}

| {{Active}}

| {{no}}

| {{dunno}}

| {{dunno}}

| {{dunno}}

| {{dunno}}

| {{dunno}}

| {{dunno}}

| {{dunno}}

| {{dunno}}

| {{no}}

| {{Active}}

| {{partial|Partially}}Only the encryption related source code is open.

| {{yes}}{{cite web|title=WhatsApp Encryption Overview – Technical white paper|url=https://www.whatsapp.com/security/WhatsApp-Security-Whitepaper.pdf|publisher=WhatsApp Inc.|access-date=5 April 2016|date=4 April 2016}}

| {{no}}

| {{yes}}

| {{no}}

| {{yes}}

| {{yes}}

| {{yes}}

| {{yes}}

| {{no}}

| {{Active}}

| {{yes}}

| {{yes}}{{cite web|title=A major upgrade to calling|website=Medium|publisher=Wire Swiss GmbH|url=https://medium.com/wire-news/a-major-upgrade-to-calling-9ac8780741a1#.5jt0cku16|date=14 March 2017|access-date=14 March 2017}}

| {{no}}

| {{dunno}}

| {{yes}}{{Cite web|url=https://wire.com/resource/Wire%20Security%20Whitepaper/download/|title=Wire Security Whitepaper|publisher=Wire Swiss GmbH|access-date=13 April 2016}}{{Dead link|date=November 2019 |bot=InternetArchiveBot |fix-attempted=yes }}

| {{yes}}

| {{yes}}{{cite web |title=Security & Privacy |url=https://wire.com/en/security/ |website=Wire |access-date=19 January 2020 |quote=New encryption keys are used for each message, so a compromised key has minimal impact.}}

| {{yes}}

| {{yes}}

| {{no}}

| {{no|Abandonware}}

| {{yes|Viewable source}}{{cite web|url=http://zfoneproject.com/faq.html#opensource|title=Is Zfone open source?|website=zfoneproject.com|publisher=Zfone|access-date=26 August 2016|date=2006}}

| {{yes}}

| {{yes}}

| {{optional}}{{cite web|url=http://zfoneproject.com/faq.html#suiteb|title=Do you support Elliptic Curve Diffie-Hellman?|website=zfoneproject.com|publisher=Zfone|access-date=26 August 2016|date=2006}}

| {{dunno}}

| {{yes}}{{cite web|url=http://zfoneproject.com/faq.html#srtp|title=Why do we need ZRTP if we already have SRTP? Isn't SRTP good enough?|website=zfoneproject.com|publisher=Zfone|access-date=26 August 2016|date=2006}}

| {{yes}}

| {{yes}}

| {{dunno}}

| {{dunno}}