Article · Wikipedia archive · Last revised Jun 6, 2026

Comparison of VoIP software

This is a comparison of voice over IP (VoIP) software that examines applications and systems used for conducting voice and multimedia communications across Internet Protocol (IP) networks. VoIP technology has transformed telecommunications by offering alternatives to traditional telephony systems while providing enhanced features and cost savings.

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This is a comparison of voice over IP (VoIP) software that examines applications and systems used for conducting voice and multimedia communications across Internet Protocol (IP) networks. VoIP technology has transformed telecommunications by offering alternatives to traditional telephony systems while providing enhanced features and cost savings.

For residential users, VoIP services typically provide significant cost advantages compared to traditional public switched telephone network (PSTN) services. These systems eliminate geographic restrictions on phone numbers, enabling users to maintain local numbers in any area code regardless of their physical location. For example, a user can operate a New York phone number while residing in Tokyo, facilitating global mobility and reducing international communication costs.

In enterprise environments, VoIP technology enables the consolidation of voice and data networks into a unified IP infrastructure. This consolidation eliminates the need for separate voice and data pipelines while providing advanced capabilities including:

  • Unified communications integration
  • Presence management systems
  • Advanced call routing
  • Mobile device integration
  • Multimedia conferencing capabilities

Softphone applications serve as the primary client-side implementation of VoIP technology. These applications transform standard computing devices into full-featured communication endpoints, supporting voice and video calls over IP networks while providing standard telephony functions. Most softphone clients utilize the Session Initiation Protocol (SIP), an open standard that supports various audio and video codecs. Some systems, like Skype, operate on proprietary protocols but can integrate with SIP-based systems through specialized business telephone system (PBX) software.

The VoIP ecosystem encompasses various specialized applications beyond basic communication endpoints:

Core components

  • Conferencing servers for large-scale virtual meetings
  • Intercom systems for internal communications
  • Virtual foreign exchange services (FXOs)
  • Hybrid systems supporting both VoIP and PSTN integration

Specialized applications

  • Interactive Voice Response (IVR) systems
  • Automated dictation platforms
  • Professional call recording solutions
  • Custom hold music and messaging systems

VoIP implementations generally fall into two categories:

  • Web-based solutions that operate through browsers, offering simplified deployment and platform independence
  • Standalone desktop applications that provide enhanced features, superior reliability, and advanced feature sets

Desktop applications

Program Operating systems License Costs Protocols Codecs Encryption Max conference peers Other abilities Latest release
Blink Linux, macOS, Windows 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 TLS, SRTP and ZRTP on all versions, OTR/SMP on Linux and macOS only1 No limit IM, file transfer, desktop sharing, multi-party conference, wideband Blink Qt
Battle.net macOS, Android, iOS, Windows Proprietary Free Unknown Unknown Unknown Unknown IM, multi-party conference Unknown
Discord macOS, Android, iOS, Windows, Linux Proprietary Free, Premium "Nitro" Subscription for Additional Features. RTP, UDP, WS, HTTPS Opus TLS 5000 soft limit for voice calls,2 25 hard limit for video3 IM, file sharing, desktop sharing, in-game overlay 10.0.19045; December 19, 2024 (2024-12-19)
Eyeball Chat Windows Proprietary Free SIP, STUN, ICE, XMPP Unknown Yes 54 IM, Conferencing, Voice, Video and SIMPLE based presence Windows 3.2; 2009 (2009)
FaceTime 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".
Fluxer Linux, macOS, Windows, mobile PWA AGPLv3 Free, premium "Plutonium" subscription for additional features (only required on the official instance). TLS 20 IM, file sharing, desktop sharing 0.0.8; February 16, 2026 (2026-02-16)
IBM Sametime Linux, macOS, Windows, mobile Proprietary ? SIP-SIMPLE, T.120 H.323 TLS Unknown IM, File transfer, Voice, Presence, Server stored contact list, HTTP tunneling, plugins, embeddable in Lotus Notes5 8.5.2; May 8, 2011 (2011-05-08)
Jami Android, FreeBSD, iOS, iPhone, Linux, Microsoft Windows, OS X6 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 Voice encryption (SRTP with SDES or ZRTP) and signaling encryption (TLS), multiple realms authentication mechanism No limit Blockchain ID-management, Qt client, address book, multiple accounts, unlimited call number, call transfer, call hold-resume, call recording, multi-way conferencing
App Store4.00 / October 22, 2025 (2025-10-22)7
Chocolatey2025.10.1 / October 1, 2025 (2025-10-01)8
F-Droid20251114-01 / November 14, 2025 (2025-11-14)9
Flathub20251106.0 / November 6, 2025 (2025-11-06)10
GNU/Linux20251116 / November 16, 2025 (2025-11-16)11
Google Play20251117-01 / November 17, 2025 (2025-11-17)12
Homebrew2.37 / November 22, 2025 (2025-11-22)13
macOS2.37 / November 22, 2025 (2025-11-22)14
Snap Store20251106 / November 6, 2025 (2025-11-06)15
Windows20251001 / October 1, 2025 (2025-10-01) 16
Jitsi Linux, macOS, Windows (all java supported). Experimental Android builds are also available.17 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 ZRTP, SRTP, OTR, TLS Unknown Text messaging, audio-video telephony, IPv6 (often broken,18 P2P not supported19), call recording, 64-bit 2.10 (build.5550) (February 5, 2017 (2017-02-05)) [±]
Linphone Linux, Windows, macOS, Android, iPhone, BlackBerry GPL-3.0-or-later Free SIP Speex, Opus, G711, GSM, G.722, VP8 (WebM), H263, MPEG4, Theora and H264 (plugin) TLS, SRTP, ZRTP Unknown 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; June 25, 2020 (2020-06-25), provides daily snapshots via http://www.linphone.org/snapshots
Messages macOS Proprietary Free, only macOS and iOS SIP AIM ICQ XMPP H263, H264 Unknown Unknown Integrated, PBX independent 7.0; July 25, 2012 (2012-07-25)
Movim Any, Progressive web application GPL-2.0-or-later Free XMPP, STUN, TURN Depending the web-browser TLS 2 IM, microblogging, social-network, OMEMO encryption, screen-sharing, file transfer 2026-04-24
Mumble Linux, macOS, iOS, Windows, Android BSD-3-Clause Free ICE CELT, Speex, Opus 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; September 14, 2022 (2022-09-14)
Nymgo Windows, Android, iOS Proprietary Free SIP, RTP and RTCP Unknown Yes No limit Address Book integration, Call recording/export, Mute, On Hold, Caller ID definition 4.2.9; March 2013 (2013-03)
Phoner Windows Proprietary Free SIP, TAPI, CAPI G.711a, G.711u, G.722, G.726, G.729, GSM, iLBC, speex, Opus TLS, SRTP, ZRTP 8 Conferencing, call redirection, call recording 3.23 (5 March 2021 (2021-03-05)) [±]20
PhonerLite Windows Proprietary Free SIP G.711a, G.711u, G.722, G.726, G.729, GSM, iLBC, speex, Opus TLS, SRTP, ZRTP 8 Conferencing, call redirection, call recording 3.38 (30 March 2026 (2026-03-30)) [±]21
Roger Wilco GameSpy Windows Proprietary ? Proprietary MELP No Unknown ? 1999 (1999)
Signal Linux, macOS, Windows, Android, iPhone GPLv3 clients and AGPLv3 server Free RingRTC (WebRTC over Signal protocol22) Opus22 TLS, Signal Protocol23 5024 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.
Android8.9.125 Edit this on Wikidata / 27 April 2026
iOS8.1026 Edit this on Wikidata / 6 May 2026
Desktop8.10.027 Edit this on Wikidata / 12 May 2026
Skype Linux(with limited functionality),28 macOS, Windows 2000-XP-Vista-7-Mobile (unsupported), BREW, Windows Phone, Android, iPhone, PSP Proprietary Free Proprietary P2P protocol a SILK 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.
Windows, UWP, discontinued15.150.3125.0 / 5 May 2025 (2025-05-05)303132
Windows, desktop, discontinued8.150.0.125 / 5 May 2025 (2025-05-05)3031
macOS, discontinued8.150.0.125 / 5 May 2025 (2025-05-05)3031
Linux, discontinued8.150.0.125 / 5 May 2025 (2025-05-05)3033
Android, discontinued8.150.0.125 / 5 May 2025 (2025-05-05)343536
iOS, discontinued8.150.0.125 / 5 May 2025 (2025-05-05)3437
Steam Chat Web, Phones, Desktop Proprietary WebRTC
TeamSpeak Linux, Windows, macOS, FreeBSD, Android, iOS Proprietary Free Unknown CELT, Speex (both until server version 3.5.0), Opus38 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, IM. 6.0.0-beta3.4; December 11, 2025 (2025-12-11)
TeamTalk 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; November 2018 (2018-11)
TeamViewer Linux, Windows, macOS, iOS, Android39 Proprietary Free (personal use only) Unknown Unknown AES256 Unknown Unknown
Windows15.76.6 / May 6, 2026 (2026-05-06)40
macOS15.76.6 / May 6, 2026 (2026-05-06)41
Web15.76.6 / May 6, 2026 (2026-05-06)42
Linux15.76.5 / April 2, 2026 (2026-04-02)43
Androidb15.77.140 / May 7, 2026 (2026-05-07)444546
iOS15.77.1 / April 28, 2026 (2026-04-28)4748
Windows (UWP-only, discontinued)15.53.6 / April 15, 2024 (2024-04-15)40
Telephone macOS 10.10.2 BSD Free SIP, STUN, ICE Unknown No Unknown Address Book integration 1.1.4; March 6, 2012 (2012-03-06)
Tuenti Android, iPhone, Windows Phone Proprietary Free WebRTC, SIP, XMPP iLBC, Opus Yes Unknown Voice, video, Instant messaging, group chat, photo and video sharing, SMS and MMS, native and social network contacts integration, incoming call/IM push notifications.
Twinkle Linux GPL-2.0-or-later Free SIP G.711 A-law μ-law, G.726, GSM, iLBC, Speex narrow wide ultrawide SRTP, ZRTP 3 Conferencing, chat, file transfer, Firefox integration, call redirection, voicemail, support of VoIP-to-Phone services 1.10.3 (February 19, 2022 (2022-02-19)) [±]
Ventrilo macOS, Windows, iOS, Android Proprietary Free Unknown Unknown No 8 Conferencing, chat, text-to-speech 3.0.8
Viber Linux,c macOS,c Windows,c Android, Bada, BlackBerry OS, iOS, Series 40, Symbian, Windows Phone Proprietary ? Unknown Unknown Yes51 Unknown Varies by platform: Text, picture and video messaging on all, voice calling only on iPhone, Android and Microsoft's Windows Phone
Android20.4.3.052 Edit this on Wikidata / 2 July 2023 (2 July 2023)
iOS20.4.053 Edit this on Wikidata / 4 July 2023 (4 July 2023)
Windows20.2.054 Edit this on Wikidata / 12 June 2023 (12 June 2023)
macOS20.2.054 Edit this on Wikidata / 12 June 2023 (12 June 2023)
Linux20.3.0.155 Edit this on Wikidata / 14 June 2023 (14 June 2023)
Wire Linux, Windows, macOS, iOS, Android, Web GPLv3 not free ? Audio: Opus

Video: VP8

DTLS, SRTP56 1057 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) ?
Yate Client Linux, macOS, Windows GPL Free SIP, IAX, XMPP, H.323 G.711a, G.711u, GSM 06.10, iLBC, Speex, G.723, G.726, G.728, G.729 SRTP, maybe ZRTP? Unknown 6.0.0; September 2017 (2017-09)
Zfone Linux, macOS, Windows Proprietary (with viewable source) Includes time bomb provision SIP, RTP Unknown SRTP, ZRTP Unknown Beta 2008-09-04 (Linux 0.9.224), (macOS 0.9.246), (Windows 0.9.206)
  1. 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 directly29
  2. Including ChromeOS
  3. Viber must be first installed on a mobile phone to function on a desktop operating system4950

Mobile phones

For mobile VoIP clients:

Program Operating systems License Open source Protocols Codecs Encryption Other abilities Latest release
Jami iOS, Android58 GPLv3 Yes SIP Video: H264, VP8, MP4V, H263, Audio: Opus 48000 hz, G722 PCMA, PCMU SRTP, SIP over TLS ? Version 202103261733 March 2021 (2021-03)
Line Android, iOS Proprietary No ? ? ? ?
Signal iOS, Android GPLv3 Yes WebRTC23 Opus23 TLS, Signal Protocol23 End-to-end encryption by default for everything. CallKit and location privacy,59 one-to-one and group messaging, video calling,59 image/video sharing, timed messages, identity verification, screenshot blocking. Android only: SMS/MMS messaging, doodling,60 GIF sharing.61 Android 5.2.3 / 15 September 2023

iOS 6.41.1 / 15 September 2023 Desktop 1.33.4 / 13 September 2023

Tango iOS, Android, Microsoft Windows, macOS, Windows Phone Proprietary, freeware ? ? ? ? VoIP, Wi-Fi out & in, SMS over IP, call-through & call-back, instant messaging, videoconferencing ?
WhatsApp

Android, BlackBerry, iOS, Symbian, Windows Phone

Proprietary, freeware No ? ? ECDH, SRTP62 VoIP and instant messaging over Wi-Fi or a data connection.
iOS26.10.7463 Edit this on Wikidata / March 20, 2026 (March 20, 2026)
Android2.26.10.7264 Edit this on Wikidata / March 14, 2026 (March 14, 2026)
Windows2.2607.6.065 Edit this on Wikidata / March 16, 2026 (March 16, 2026)
macOS26.10.7463 Edit this on Wikidata / March 20, 2026 (March 20, 2026)

Frameworks and libraries

Program Operating systems License Protocols, based on, compatible with Encryption Other abilities Key and target markets Latest release
Telepathy, Farstream Linux, macOS, Windows LGPL SIP, XMPP (Jingle), ICE (STUN/TURN), UPnP No Multi-user A/V conferencing, IM, collaborative applications Mobile devices (Maemo, Meego), Linux desktop or embedded spec 0.27.2; September 24, 2013 (2013-09-24)
OPAL Windows, Linux (including embedded variants), macOS MPL SIP, H.323, IAX2, CAPI, VXML Unknown Multi-user A/V conferencing, IM, IVR Softphones, softswitches, telephony application servers 3.14.3; October 10, 2014 (2014-10-10)
GNU oSIP Linux, Windows, macOS, Android, iPhone, BlackBerry LGPL SIP, SDP Unknown Multi-user A/V conferencing, IM, IVR Softphones, embedded and mobile devices, telephony application servers 4.1.0; December 18, 2013 (2013-12-18)

Server software

Name Operating systems License Protocols Encryption Notable features Target markets Latest release
3CX Phone System Windows, Linux Proprietary SIP TLS, SRTP VoIP/VideoOverIP calls and conferencing, voicemail and instant messaging < 50,000 users 18.2; December 8, 2021 (2021-12-08)
AskoziaPBX Standalone program (Linux-based) Proprietary SIP, H.323, IAX, SCCP No ISDN, voicemail, conferencing, MOH, ACD, IVR, call forwarding, call recording SMEs up to 50 users 5.4; September 2, 2017 (2017-09-02)
Asterisk PBX Linux, BSD, macOS, Solaris GPL-2.0+, optional: Proprietary66 SIP, H.323, IAX, MGCP, VoFR, XMPP, Google Talk, TDM TLS, SRTP VoIP gateway, voicemail, basic accounting (expandable with ODBC-compliant database), billing, conferencing, hot desking, IVR trees with conditional logic, call waiting, automated call distribution Enthusiasts, developers, enterprise users (capacity dependent on server design, scalable across multiple servers) 21.3.1 (17 May 2024 (2024-05-17)67)

20.5.0 LTS (18 October 2023 (2023-10-18)68)
19.8.1 (7 July 2023 (2023-07-07)69)
18.20.0 LTS (18 October 2023 (2023-10-18)70)


Brekeke PBX Linux, Windows Server 2016 and Server 2019 Proprietary SIP TLS, SRTP VoIP/VideoOverIP calls and conferencing, voicemail Hosted service providers, Mid-large enterprise 3.12.2.2; January 11, 2022 (2022-01-11)
CommuniGate Pro Linux, BSD, macOS, Windows, Solaris, HP-UX, AIX Proprietary SIP, XIMSS, XMPP, WebRTC SSL, TLS, SRTP SIP Registrar/Proxy, Authentication, Diameter, RADIUS, ENUM Mobile network operators, ISPs, SaaS providers 6.2.14; August 16, 2019 (2019-08-16)
Dial Gate VoIP Softswitch Linux, Windows Proprietary SIP TLS, SRTP Billing server, real-time account and line monitoring, web portal Softswitch users, service providers 4.3; June 1, 2014 (2014-06-01)
Dial-Office IP-PBX Linux, Windows Proprietary SIP TLS, SRTP Unified communications, conference calls, remote worker support and voicemail Small businesses, Mid-large enterprises 4.1; December 2013 (2013-12)
Elastix Linux Proprietary SIP, IAX, H.323, XMPP TLS, SRTP Unified communication server that also supports chat, mail and fax. Capacity dependent on server design, scalable across multiple servers 5.0.0; December 7, 2016 (2016-12-07)
FreeSWITCH Linux, BSD, macOS, Solaris, Windows Mozilla Public License SIP, NAT-PMP, STUN, SIMPLE, XMPP, Google Talk (Jingle), IAX, H.323, MRCP, RSS, Skype TLS, SRTP, ZRTP Recording, Voicemail, Conferencing, RADIUS, ENUM, IM Proxy, Streaming, Media gateway, Soft-PBX, IVR (modular) Large soft-switch users, home PBX users, softphone users 1.10.12 (August 3, 2024 (2024-08-03)71) [±]
FreePBX Linux, BSD, Solaris GPL SIP, IAX, H.323, XMPP TLS, SRTP Complete PABX Service, based on Asterisk and PHP 5.6; provides a full replacement for a legacy non-VoIP phone system; under current and active development Scales from Raspberry PI (3 users) to multiple parallel clusters (10K+ simultaneous calls) 14.0; August 2017 (2017-08)
Galene Linux, Unix, Mac OS, Windows MIT Licence WebRTC, WHIP TLS, SRTP Lightweight, efficient, easy to install and to administer Teaching, conferences, meetings 0.96.2; January 2025 (2025-01)
GNU Gatekeeper Linux, FreeBSD, macOS, Windows XP-2000-Vista-7 GPL H.323 H.235 H.460.18 firewall traversal, routing, accounting video conferencing, VoIP carriers large and small 3.7; August 15, 2014 (2014-08-15)
HERO Hosted PBX Linux, Windows Proprietary SIP TLS, SRTP Unified Communications, billing server, cloud-based management and web interface Mid-large enterprises, VoIP carriers and service providers, telecom operators 4.3; December 2013 (2013-12)
Murmur Linux, BSD, macOS, Windows BSD, GPL CELT, Speex, Opus TLS Chat with (limited) embedded HTML, ACLs for user management, Customizable In-Game Overlay, Directional Audio, Plugin Support, Nested Channels Individuals to Small and medium enterprise (25-5000 users) 1.2.17; September 24, 2016 (2016-09-24)
Kamailio, OpenSIPS (formerly named OpenSER) Linux, BSD, Solaris GPL SIP, XMPP TLS, SRTP SIP registrar-proxy, authentication, Diameter, RADIUS, ENUM, least-cost-routing, many others SIP Service Providers 5.2.8; October 2020 (2020-10)
SIP Express Router (SER) Linux, BSD, Solaris GPL SIP No SIP Registrar/Proxy, Authentication, Diameter, RADIUS, ENUM, many others SIP Service Providers 2.0.0 Ottendorf
sipXecs IP PBX Linux AGPL Native SIP call control, XMPP TLS, SRTP Full redundancy (HA), instant messaging, voicemail, user portal, admin GUI, plug & play management including phones and gateways, fully featured Enterprises between 10 and 10,000 users, multi-site 14.04.2; July 2014 (2014-07)
vzRoom Windows Proprietary SIP SSL, TLS, AES Instant messaging-chat, VoIP, video, sharing (desktop, video, file), whiteboard, scheduler, recording Individual to small and medium enterprise (2-1,000 users) 0.8.8.735; November 2010 (2010-11)
Yate BSD, Linux, macOS, Windows GPL SIP, IAX, H.323, ISDN, XMPP (Jabber), Jingle (Google Talk), MGCP, SS7 over IP, Cisco SLT (Signalling Link Transport) (SS7 MTP2 backhaul over IP), SCTP, SCCP, TCAP, MAP CAMEL SSL, TLS, SRTP Voice, video, file transfer, data, H323 to SIP signalling proxy, instant messaging, IVR, 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 Deployed on home servers and large networks with millions of users 6.3; February 2021 (2021-02)

Secure VoIP software

VoIP software with client-to-client encryption

The following table is an overview of those VoIP clients which (can) provide end-to-end encryption.

Client name Development status Open source client End-to-end authenticationa Encryption protocols Forward secrecy Multiple encryption Encrypted group calling Proxy, Tor
ZRTP ECDH DTLS SRTP
FaceTime Active No72 Yes73 ? ? ? Yes73 Yes ? Yes No
Jami Active Yes Yes No ? Yes Yes Yes ? Yes ?
Jitsib Active Yes Yes72 Yes No Yes Yes Yes72 Yes Yes ?
Line7475 Active No ? ? ? ? ? ? ? No74 No
Linphoneb Active Yes Yes Yes ? Yes Yes Yes Yes ? No
Signal Active Yes Yes72 No Yes No Yes Yes72 Yes Yes Depends76
Skype
(opt-in per conversation,
one pair of devices per conversation)77 		Abandonware No Yes78 No No No Yes79 ? ? No No
Telegram Active Yes Yes80 No No No No Yes ? No No
Threema Active Partiallyc81 Yes82 No Yes82 Yes82 Yes82 Partiallyd82 Yes No No
Viber51 Active No ? ? ? ? ? ? ? ? No
WhatsApp Active Partiallyc83 Yes83 No Yes83 No Yes83 Yes83 Yes83 Yes83 No
Wire Active Yes Yes84 No ? Yes56 Yes56 Yes85 Yes Yes No
Zfone Abandonware Viewable source86 Yes Yes Optional87 ? Yes88 Yes Yes ? ?
See also

See also

Notes

Notes

  1. End-to-end authentication protects communications from man-in-the-middle attacks by the service provider.
  2. Only if the user has registered with a compatible SIP provider. Some SIP providers do not support certain encryption protocols.
  3. Only the encryption related source code is open.
  4. Only on the network connection, not on the end-to-end layer.
References

References

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