Comparison of VoIP software

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This is a comparison of voice over IP (VoIP) software used to conduct telephone-like voice conversations across Internet Protocol (IP) based networks. For residential markets, voice over IP phone service is often cheaper than traditional public switched telephone network (PSTN) service and can remove geographic restrictions to telephone numbers, e.g., have a PSTN phone number in a New York area code ring in Tokyo.

For businesses, VoIP obviates separate voice and data pipelines, channelling both types of traffic through the IP network while giving the telephony user a range of advanced abilities.

Softphones are client devices for making and receiving voice and video calls over the IP network with the standard functions of most original telephones and usually allow integration with VoIP phones and USB phones instead of using a computer's microphone and speakers (or headset). Most softphone clients run on the open Session Initiation Protocol (SIP) supporting various codecs. Skype runs on a closed proprietary networking protocol but additional business telephone system (PBX) software can allow a SIP based telephone system to connect to the Skype network.[1] Online chat programs now also incorporate voice and video communications.

Other VoIP software applications include conferencing servers, intercom systems, virtual foreign exchange services (FXOs) and adapted telephony software which concurrently support VoIP and public switched telephone network (PSTN) like Interactive Voice Response (IVR) systems, dial in dictation, on hold and call recording servers.

Some entries below are Web-based VoIP; most are standalone applications.

Softphone applications[edit]

Program Operating systems License Costs Protocols Codecs Encryption Max conference peers Other abilities Latest release
AudioCodes MobilityPLUS Windows, Android, iOS Proprietary ? SIP, RTP, XMPP, STUN, ICE G.722 wideband, G.711a, G.711u, iLBC, G.729a, SILK, GSM, VP8, H.264, Opus TLS, SRTP Unknown Voice, video, IM, Group chat, content sharing, SMS and MMS over IP services, native and social network contacts integration, incoming call/IM push notifications. 2014; 2 years ago (2014)
Avaya Application Server 5300 Soft Client Windows Proprietary ? SIP, RTP Unknown TLS, SRTP Unknown 2.0; 2010; 6 years ago (2010)
Blink Linux, OS X, Windows Mixed: free software versions under GNU GPLv3 + shareware versions under gplv3 with exception of including proprietary code Windows and Linux are free, OS X version is available for a fee in Mac App Store, source code is freely available 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 OS X only[2] No limit IM, file transfer, desktop sharing, multi-party conference, wideband Blink Qt
Cisco IP Communicator Windows, Android Proprietary Free (for Cisco SMB Partners only) SCCP (Skinny), SIP, TFTP G.722 wideband, G.711a, G.711u, iLBC, G.729a, G.729ab SRTP Unknown Call Recording, Silent Monitoring, Multiple lines and directory numbers, Configurable speed dial, Calling name and number display, Call Waiting, Call Forward, Call Transfer, Three-Way Calling (conference), Call Park, Call Pickup, Redial, Hold, Barge, Callback, Extension Mobility, Message waiting indicator, iDivert, Meet Me conferencing, Group Pickup, Do Not Disturb 7.0.6; January 2011; 5 years ago (2011-01)
Ekiga Linux, Windows, OpenSolaris GPL Free SIP, H.323, STUN, Zeroconf, XMPP, RTP H.263, H.264/MPEG-4 AVC, Theora, iLBC, Speex, SILK, GSM, ... No Unknown Video, IM, LDAP, Call Forwarding, Call Transfer, Auto-answering, PC to phone, phone to PC, Multiple accounts, USP support, Message waiting indicator, SIMPLE-based presence etc. 4.0.1 (February 21, 2013; 3 years ago (2013-02-21)) [±][3]
Empathy Linux GPL Free SIP, XMPP (Jingle), ICE (STUN-TURN), Zeroconf Unknown No Unknown IM, multi-user A/V,[4] collaborative applications 3.12.12[5] (May 13, 2016; 3 months ago (2016-05-13)) [±]
Eyeball Chat Windows Proprietary Free SIP, STUN, ICE, XMPP Unknown Yes 5[6] IM, Conferencing, Voice, Video and SIMPLE based presence Windows 3.2; 2009; 7 years ago (2009)
eyeBeam Windows Proprietary ? SIP-SIMPLE Unknown TLS, SRTP 6 party audio; 3 party video Voice and Video calling; IM; Import Microsoft Outlook Contacts; USB Support; Call Recording and Conferencing 1.5.20.1; March 2010; 6 years ago (2010-03)
Google+ Hangouts Linux, Windows, OS X, Android, iOS Proprietary (using libjingle) Free XMPP H.264/SVC, H.264/AVC, H.263 and VP8 SRTP 10 Video, chat, screen sharing, with additional tools available as "Hangout Apps". Google Chrome Web Store extension
2013.626.1614.1 (July 9, 2013; 3 years ago (2013-07-09)) [±] [7]
IBM Sametime Linux, OS X, Windows, mobile Proprietary ? SIP-SIMPLE, T.120 H.323 TLS Unknown IM, File transfer, Voice, Presence, Server stored contact list, HTTP tunneling, plugins, embedable in Lotus Notes[8] 8.5.2; May 8, 2011; 5 years ago (2011-05-08)
iCall Linux, OS X, Windows, iOS, Android Proprietary Free SIP, AIM, ICQ, XMPP Speex, CELT, WebM TLS, ZRTP No limit Video, file transfer, PC to phone, phone to PC, IM (MSN, AIM, ICQ, Yahoo!, XMPP, Google Talk), Voicemail 7.1.522
Jitsi Linux, OS X, Windows (all java supported). Experimental Android builds are also available.[9] Apache 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, TLS Unknown Text messaging, audio-video telephony, IPv6 (often broken,[10] P2P not supported[11]), call recording, 64-bit 2.8 (build.5426) (March 19, 2015; 17 months ago (2015-03-19)) [±]
KPhone Linux (KDE) GPL Free SIP, STUN, NAPTR-SRV Unknown SRTP Unknown Video, voice, IM, external Sessions, IPv6 support for UDP 1.2 (November 2008)
Linphone Linux, Windows, OS X, Android, iPhone, BlackBerry GPL 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 supported only by version 3.5.1-2) 3.10.0; August 11, 2016; 18 days ago (2016-08-11)
Messages OS X Proprietary ? SIP AIM ICQ XMPP H263, H264 Unknown Unknown Integrated, PBX independent 7.0; July 25, 2012; 4 years ago (2012-07-25)
MicroSIP Windows GPL Free SIP, STUN, ICE, SIMPLE Speex, iLBC, GSM, G.711, G.722, G.729, SILK, Linear PCM TLS, SRTP Unknown Video, voice, IM and Presence 3.10.11; December 2015; 8 months ago (2015-12)
Mirial Softphone (Mirial s.u.r.l.) Windows 2000-XP-2003-Vista-7 (including 64-bit versions), OS X (x86) Proprietary not free SIP, RTSP H.323 DTLS-SRTP Unknown H.264 Full-HD 1080p video rx/tx, Two independent lines supporting Call Control and 3-Party videoconference in Continuous Presence, G.722.1/C wideband audio, Call recording/export, DV/HDMI/Component capture, Presentation (H.239, RFC-4796), Encryption, Far End Camera Control, GPU accel (D3D and OpenGL) 7.0.24; May 26, 2010; 6 years ago (2010-05-26), discontinued
Mumble Linux, OS X, iOS, Windows, Android New BSD license Free Unknown CELT, Speex, Opus TLS and OCB-AES128 No max (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 1.2.15; March 5, 2016; 5 months ago (2016-03-05)
Nymgo Windows, Android, iOS Proprietary Free SIP, RTP and RTCP Unknown Yes No Address Book integration, Call recording/export, Mute, On Hold, Caller ID definition 4.2.9; March 2013; 3 years ago (2013-03)
oovoo OS X, iOS, Windows, Android Proprietary Free SIP, RTP and RTCP Unknown Yes 12 Address Book integration, Call recording/export, Mute, On Hold, Caller ID definition 4.2.9; March 2013; 3 years ago (2013-03)
PC-Telephone Windows Proprietary Free TCP, UDP, SIP, RTP, ISDN, T.30 modem for Group 3 Fax G.711a, G.711u, GSM optional 4/30 All normal full-duplex telephone operations, call recording, call forwarding, call transfer, call answer, calling line identity presentation-restriction (CLIP/CLIR), call scheduling, call waiting, call accounting, muting, audio conferencing, data transfer, fax transfer, voicemail, call screening 7.2; 2015; 1 year ago (2015)
Phoner Windows Proprietary Free SIP, TAPI, CAPI Unknown TLS, SRTP, ZRTP 8 Conferencing, call redirection, call recording 3.08 (29 February 2016; 5 months ago (2016-02-29)) [±][12]
PhonerLite Windows Proprietary Free SIP Unknown TLS, SRTP, ZRTP 8 Conferencing, call redirection, call recording 2.34; December 2015; 8 months ago (2015-12)
QuteCom Linux, OS X, Windows XP-2000 GPL Free SIP G.711, G.729, iLBC, AMR-NB, G.722, Speex, AMR-WB (G.722.2), H.263, H.263+, H.264, Dirac[13] SRTP, but key exchange via Everbee key Exchange which is not a Standard Unknown Video, IM (MSN, AIM, ICQ, Yahoo!, XMPP, Google Talk), voicemail, wengo to phone, conferencing. 2.2.1 (22 June 2011; 5 years ago (2011-06-22)[14]) [±]
Revation Communicator Windows, OS X Proprietary ? Proprietary G.722, G.711, VP8, Opus TLS and SRTP No max, limited by server mixing services Secure multi-party chat, instant messaging, presence, VoIP, video, file transfer, desktop sharing 7.0; June 2014; 2 years ago (2014-06)
Ring Linux, OS X, Windows, Android (all beta) GPL3 Free SIP, RTP, IAX2, STUN per account, SRV 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 Gnome-KDE client, address book, multiple accounts, unlimited call number, call transfer, call hold-unhold, call recording, multi-way conferencing 1.4.1; September 2014; 1 year ago (2014-09)
Roger Wilco GameSpy Windows Proprietary ? Proprietary ? ? ? ? 2001; 15 years ago (2001)
Skype Linux, OS X, Windows 2000-XP-Vista-7-Mobile (unsupported), BREW, Windows Phone , Android, iPhone, PSP Proprietary Free Proprietary P2P protocol [a] SILK Advertises proprietary encryption which is considered insecure. 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.
Spikko Windows 2000-XP-Vista-7-Mobile, iPhone, Proprietary Free SIP Unknown Yes 8 Conferencing, voicemail, PC to phone, phone to PC, Free international phone numbers, address book integration; December 2010; 5 years ago (2010-12)
TeamSpeak Linux, Windows, OS X, FreeBSD, Android, iOS Proprietary Free Unknown CELT, Speex, Opus[26] Yes 32 unlicensed, 512 with non-profit 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 3.0.18.2
TeamTalk Linux, Windows, OS X, Android, iOS, Raspbian Proprietary Free Proprietary Opus, Speex, WebM No 1000 Video, file sharing, desktop sharing, stream media files (MP3, AVI) 5.1.3; May 2016; 3 months ago (2016-05)
TeamViewer Linux, Windows, OS X, iOS, Android[27] Proprietary Free (personal use only) Unknown Unknown AES256 Unknown Unknown
Telephone OS X 10.10.2 BSD Free SIP, STUN, ICE Unknown No Unknown Address Book integration 1.1.4; March 6, 2012; 4 years ago (2012-03-06)
Toktumi Unlimited, Line2 Pro Windows XP-Vista-7, OS X, iOS, Android Proprietary Free Proprietary with SIP core Unknown Unknown 20 Conferencing, voicemail, caller ID, call-waiting, address book integration; auto-attendant, call-forwarding Windows; August 2010; 6 years ago (2010-08); OS X; October 2010; 5 years ago (2010-10)
Tox Linux, OS X, Windows, Android, FreeBSD GPL Free Tox, VP8 Opus, NaCl Unknown Voice, video, instant messaging, file transfers Unknown
Tru App Windows 2000-XP-Vista-7, OS X, Linux
iOS, Android, Symbian, BlackBerry OS,
Proprietary Free SIP, XMPP Unknown Unknown Unknown Chat, file transfer, voicemail, inbound numbers, integration with GTalk, Microsoft Live, Skype
Tuenti Android, iPhone, Windows Phone Proprietary Free WebRTC, SIP, XMPP iLBC, Opus Yes  ? 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 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 1.10.0 (July 15, 2016; 45 days ago (2016-07-15)) [±]
Ventrilo OS X, Windows, iOS, Android Proprietary Free Unknown Unknown No 8 Conferencing, chat, text-to-speech 3.0.8
Viber Linux,[b] OS X,[b] Windows,[b] Android, Bada, BlackBerry OS, iOS, Series 40, Symbian, Windows Phone Proprietary ? Unknown Unknown Yes[30] Unknown Varies by platform: Text, picture and video messaging on all, voice calling only on iPhone, Android and Microsoft's Windows Phone
  • Android:
    5.8.0.1736 (April 18, 2016; 4 months ago (2016-04-18)[31]) [±]
  • iOS:
    6.0 (April 19, 2016; 4 months ago (2016-04-19)[32]) [±]
  • Windows Mobile:
    4.5.4 (December 18, 2015; 8 months ago (2015-12-18)[33]) [±]
  • BlackBerry OS:
    4.3.0.728 (April 23, 2014; 2 years ago (2014-04-23)[34]) [±]
Voice Operator Panel Windows 2000-XP-Vista Proprietary ? SIP, RTP Unknown Unknown Unknown Call forwarding, call transfer, call recording, presence, Outlook integration, Windows Messenger-MSN-Live integration, CRM, built-in web browser, emailer, LDAP, APS. 1.3.2
Wire Windows, OS X, iOS, Android, Web GPLv3 Free ? ? DTLS, SRTP[35] 5[35] ? ?
X-Lite OS X, Windows Proprietary Free SIP, STUN, ICE, TURN H.263, H.263+, G.711, iLBC, Speex No 3 VoIP over WiFi, 3G, 4G, video, instant messaging, presence (SIP SIMPLE), call waiting, call hold, call forwarding, voice mail, message waiting indication, 3 way conferencing, contacts integration, background noise reduction (BNR), automatic gain control (AGC) Windows: 4.9.2, OS X: 4.9.2; December 2015; 8 months ago (2015-12)
Yahoo! Messenger Mac OS (8, 9, X), Windows, (Linux, FreeBSD version VoIP incapable) Proprietary Free SIP (using TLS) and RTP (media) Unknown Unknown Unknown Video, file transfer, PC to phone, phone to PC Windows: 11.5.0.228; May 31, 2012; 4 years ago (2012-05-31)
Mac: 3.0.1; July 20, 2011; 5 years ago (2011-07-20)
Linux: 1.0.6; September 2003; 12 years ago (2003-09)
SunOS 5.7: 0.99.17-1; September 2003; 12 years ago (2003-09)
Solaris 8: 1.0.4; September 2003; 12 years ago (2003-09)
FreeBSD 4-5: 1.0.4; September 2003; 12 years ago (2003-09)
iOS: 2.2.6; July 12, 2012; 4 years ago (2012-07-12)
Yate Client Linux, OS X, 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 4.3; January 2013; 3 years ago (2013-01)
Zfone Linux, OS X, Windows Viewable source Includes time bomb provision SIP, RTP Unknown SRTP, ZRTP Unknown Beta 2008-09-04 (Linux 0.9.224), (OS X 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 directly[1]
  2. ^ a b c Viber must be first installed on a mobile phone to function on a desktop operating system[28][29]

Discontinued softphone service[edit]

Mobile phones[edit]

For mobile VoIP clients:

Program Operating systems License Open source Protocols Codecs Encryption Other abilities Latest release
Acrobits Softphone Android v2.2+, iOS v7.0+ Proprietary No SIP G.711, G.722, iLBC, GSM, G.729 TLS, SRTP, ZRTP VOIP over Wi-Fi or 3G iOS only: push notifications, video, number rewriting, address book matching, sms for betamax providers and pennytel Acrobits Softphone: 3.20 (Android), 5.2 (iOS)
CSipSimple Android GPL Yes SIP Opus, AMR-WB, G.722, iSAC, iLBC, Speex, Silk, Codec2, G.726, G711 (PCMA & PCMU), AMR, GSM SRTP, SIP over TLS 1.0 and ZRTP ? 1.02.02
iCall Mobile iOS v4.3+ Proprietary, freeware No SIP AIM ICQ XMPP, Facebook, Yahoo! Messenger, Windows Live Speex, CELT, WebM TLS, ZRTP VoIP over Wi-Fi or 3G, SMS, voicemail 2.0.1; April 2012; 4 years ago (2012-04)
Jajah Mobile Web Symbian, Windows Mobile (version unknown) Proprietary No ? ? ? web based service, Call back,no download[36] ?
JusTex by Juphoon Android, iOS v5.1+ Proprietary No SIP PCMA, PCMU, G.722, iLBC, iSAC, Opus, H.264, VP8, H.263 TLS, TCP, UDP, SRTP JusTex Softphone over Wi-Fi or 3G, HD voice and video call, Multiparty call, conference. 3.0.1 (iOS); July 13, 2014; 2 years ago (2014-07-13); 3.0 (Android); July 9, 2014; 2 years ago (2014-07-09)
Line2 Android, iOS Proprietary, freeware No Proprietary with SIP core ? ? Tri-mode calling (cellular, 3G/4G data, Wi-Fi), SMS over IP, visual voicemail, 20-person conference calls, auto-attendant, call-forwarding 1.0.4 Android, 3.2.1 iOS
Media5-fone iOS, Android Proprietary No SIP PCMA, PCMU, G.722*, iLBC, iSAC*, G.729* TLS*, SRTP* Wi-Fi and 3G/4G data, second call*, conference calls*, HD Voice, Bluetooth* (* Additional fees) ?
Signal by Open Whisper Systems iOS, Android GPLv3 Yes A custom signaling protocol.[37] ? TLS, SRTP, ZRTP, AES 128[38] VoIP and instant messaging over Wi-Fi or a data connection.[39][40] Android 3.17.0 (August 23, 2016; 6 days ago (2016-08-23)[41]) [±]

iOS 2.4.1 (August 18, 2016; 11 days ago (2016-08-18)[42]) [±]

Sipdroid Android GPL Yes SIP ? ? Uses Wi-Fi, 3G or EDGE 2.7
Tango by TangoME Inc. iOS, Android, Microsoft Windows, OS X, Windows Phone Proprietary, freeware ? ? ? ? VoIP, Wi-Fi out & in, SMS over IP, call-through & call-back, instant messaging, videoconferencing ?
Truphone Nokia-Symbian, iOS, Android, BlackBerry Proprietary, freeware No SIP ? ? VoIP, Wi-Fi out & in, SMS over IP, call-through & call-back, connection management, provisioning Symbian 4.0, iOS 1.11.1
Vopium Symbian, Java ME, Android, BlackBerry RIM, iOS, Windows Mobile 2003 SE and higher Proprietary, freeware No SIP, MSN, Skype, Yahoo, AOL, ICQ, Google Talk, Facebook & Twitter GSM ? Wi-Fi VoIP, GSM call-through, SMS over IP, least cost routing, synchronising-backup mobile contacts and calendar 2.0
WhatsApp Android, BlackBerry, iOS, Symbian, Windows Phone Proprietary, freeware No ? ? ECDH, SRTP[43] VoIP and instant messaging over Wi-Fi or a data connection. Android: 2.16.105[44] (May 26, 2016; 3 months ago (2016-05-26)[45]) [±]

BlackBerry: 2.16.4 (March 3, 2016; 5 months ago (2016-03-03)[46]) [±]
iOS: 2.16.1 (April 2, 2016; 4 months ago (2016-04-02)[47]) [±]
Symbian: 2.16.38[48] [±]
Nokia S40 devices: 2.16.4[49] [±]
Windows Phone: 2.16.164 (August 17, 2016; 12 days ago (2016-08-17)) [±]

Windows Mobile 6 Windows Mobile 6 Professional/Standard Proprietary No SIP to publicly and non-publicly routable servers ? ? Wi-Fi Mobile VoIP 6.1
X-PRO for Pocket PC Windows Mobile 2003 (earlier versions support Windows PocketPC 2002) Proprietary, discontinued in April 2007[50] No SIP ? ? Supported devices: AudioVox Maestro, Compaq/HP iPAQ: 365x, 37xx, 385x, 395x, hx4700, Dell Axim X51, X51v, Toshiba e550, e570. iPAQ 545x and Toshiba e7xx are not supported.[51] 2.2
Yuilop Android, iOS, Windows Phone, BlackBerry OS Proprietary, freeware No XMPP, RTP iLBC TLS VoIP over 3G-4G-LTE and Wi-fi, SMS, group chat, photo sharing, Location sharing, virtual phone numbers iOS 2.4 (November 26, 2014; 20 months ago (2014-11-26)[52]) [±]

Android 2.0.2 (February 12, 2014; 2 years ago (2014-02-12)) [±]
Windows Phone 7.x 1.0.1.7 (September 12, 2013; 2 years ago (2013-09-12)) [±]
Windows Phone 8.x 1.0.0.4 (September 18, 2013; 2 years ago (2013-09-18)) [±]
BlackBerry OS 1.0.1 (May 31, 2013; 3 years ago (2013-05-31)) [±]
Kindle Fire 2.0 (December 19, 2013; 2 years ago (2013-12-19)[53]) [±]

Frameworks and libraries[edit]

Program Operating systems License Protocols, based on, compatible with Encryption Other abilities Key and target markets Latest release
Tapioca Linux GPL Telepathy (software) Unknown 0.3.9; June 12, 2006; 10 years ago (2006-06-12)
Telepathy, Farstream Linux, OS X, Windows LGPL SIP, XMPP (Jingle), ICE (STUN/TURN), UPnP No Multi-user A/V conferencing, IM, collaborative applications Mobile devices (Maemo), Linux desktop spec 0.17.8; July 24, 2008; 8 years ago (2008-07-24)
OPAL Windows, Linux (including embedded variants), OS X 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; 22 months ago (2014-10-10)
GNU oSIP Linux, Windows, OS X, 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; 2 years ago (2013-12-18)

Server software[edit]

Program Operating systems License Protocols, based on, compatible with Encryption Other abilities Key and target markets Latest release
3CX Phone System Windows Proprietary SIP TLS, SRTP Voice and video IP telephony and conferencing, voice mail and instant messaging < 50,000 users 14 - SP3; February 2016; 6 months ago (2016-02)
AS5300 Linux, Windows Server 2003 Proprietary SIP, UNIStim, MLPP SSL, TLS,

SRTP, SDESC

Voice and Video IP telephony, Voice and Video conferencing, voice mail and instant messaging 1,000 - 25,000 users 1.0; January 2008; 8 years ago (2008-01)
AskoziaPBX no additional OS required (Linux based) GPL, Open core SIP, H.323, IAX, SCCP No ISDN, analog, Voicemail, Conferencing, MOH, ACD, IVR, Call forwarding, Call recording SMEs up to 50 users 2.2.2; December 2012; 3 years ago (2012-12)
Asterisk PBX Linux, BSD, OS X, Solaris Mixed: GPL, Proprietary[54] SIP, H.323, IAX, MGCP, VOFR, XMPP, Google Talk, TDM TLS, SRTP VoIP Gateway, voicemail, basic accounting (can be expanded by interface with ODBC-compliant database), billing, conferencing, hot-desking, IVR trees with conditional logic, call queuing, automated call distribution Enthusiasts, developers, enterprise users (capacity dependent on server design, scalable across multiple servers) 13.10.0 (21 July 2016; 39 days ago (2016-07-21)) [±]

11.23.0 (21 July 2016; 39 days ago (2016-07-21)) [±]


Brekeke SIP Server Linux, Windows Proprietary SIP TLS, SRTP SIP Registrar, SIP Proxy SIP Service Providers, VoIP service providers, Healthcare, Security 3.3; March 2014; 2 years ago (2014-03)
Brekeke PBX Linux, Windows Proprietary SIP TLS, SRTP Voice and Video IP telephony, Voice and Video conferencing, and voice mail Hosted service providers, Mid-large enterprise 3.3; March 2014; 2 years ago (2014-03)
CallMax Softswitch Linux Proprietary SIP, H.323 SSL, TLS, HTTPS Integrated billing, IP PBX Platform, Calling card platform, Callshop module, Customer Web Portal, Retail SMS Platform. SIP Service Providers, Residential & Business VoIP providers, Corporate Clients, Other Class 5 softswitch users 3.6; October 2015; 10 months ago (2015-10)
CommuniGate Pro Linux, BSD, OS X, Windows, Solaris, HPUX, AIX Proprietary SIP, XIMSS Protocol, XMPP, WebRTC SSL, TLS, SRTP SIP Registrar/Proxy, Authentication, Diameter, RADIUS, ENUM, many others Carriers, enterprises, MNOs, ISPs, SaaS providers 6.1.11; June 2016; 2 months ago (2016-06)
Dial-Gate Softswitch PBX Linux, Windows Proprietary SIP TLS, SRTP Billing server, real-time account and line monitoring, web-based user interface Softswitch users, service providers 4.3; June 2014; 2 years ago (2014-06)
Dial-Office IP-PBX Linux, Windows Proprietary SIP TLS, SRTP Unified Communications, Conferencing, remote worker support and voice mail Small businesses, Mid-large enterprises 4.1; December 2013; 2 years ago (2013-12)
Elastix Linux GPL SIP, IAX, H323, XMPP TLS, SRTP Unified communication server that also supports chat, mail and fax. Capacity dependent on server design, scalable across multiple servers 2.5.0 (stable), 3.0.0 (stable), 4.0.0 (stable); February 10, 2016; 6 months ago (2016-02-10)
FreeSWITCH Linux, BSD, OS X, 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 1.6.10 (August 25, 2016; 4 days ago (2016-08-25)) [±]
FreePBX Linux, BSD, Solaris GPL SIP, IAX, H323, XMPP TLS, SRTP, ZRTP Complete PABX Service, based on Asterisk and PHP 5.3; 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) 12.0; October 2014; 1 year ago (2014-10)
GNU Gatekeeper Linux, FreeBSD, OS X, 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; 2 years ago (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; 2 years ago (2013-12)
Kerio Operator Linux, VM Proprietary SIP SSL, TLS, SRTP integrated firewall, Auto attendant, Call queues, Conference calling, Call forwarding, pickup, parking, recording, Click to Call, Video calling, Fax support, Paging, Salesforce.com and CRM integration, Voicemail to email SME 2.4.3; September 3, 2015; 11 months ago (2015-09-03)
MediaCore Softswitch Linux Proprietary H.323, SIP, SMPP SSL, TLS, HTTPS Dynamic routing mechanism (with LCR, Quality, Percentage, Profit, and Priority based routings, Jurisdictional routing support), integrated billing, SIP-H.323 protocol converter, Transcoding - codec converter module, Guardian - revenue assurance module, SBC functionality, full and media proxy, SMS support Transit VoIP services providers, VoIP wholesale carriers, VoIP termination providers, SMS carriers 4.5.3; October 2015; 10 months ago (2015-10)
Murmur Linux, BSD, OS X, 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) 1.2.12; December 20, 2015; 8 months ago (2015-12-20)
Mysipswitch Linux BSD SIP, Ajax SSL SIP proxy server which allows the use of multiple SIP accounts with a single SIP login Individuals August 2007; 9 years ago (2007-08)
Objectworld UC Server Windows XP-2003-2008 Proprietary SIP No IP PBX, personal assistants, IVR, automated phone provisioning, fax server, unified messaging, Outlook, Exchange and Lotus Domino-Notes integration, conferencing, outbound dialing Small and medium enterprise (25-2000 users) 4.4.2; May 2009; 7 years ago (2009-05)
Pexip Linux Proprietary SIP, H323, WebRTC, Chat SSL, TLS, HTTPS, DTLS, SRTP, SDES Virtualized and distributed video and Voice MCU, SIP registrar, H.323 gatekeeper, and WebRTC server which provides business quality HD video and voice interoperability between any combination of SIP, MSSIP (Lync/Skype for business), H.323 and WebRTC conference participants and point-to-point gatewayed calls. Video Conference, gateway, call control/SBC and IVR functionality. Fully virtualized to run in VMWARE, Hyper-V or other hypervisor environment. Servers may optionally be geographically distributed for increased scale & resilience/redundancy and conference bandwidth reductions. JITC certified. Flexible: 5 users-100,000+ users; for small, medium and large enterprises or service provider. May use 1-100+ conference node virtual machines in a single deployment 2015; 1 year ago (2015)
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 4.0.1 (25 April 2013; 3 years ago (2013-04-25)) [±]
Pbxnsip Linux, BSD, OS X, Windows Proprietary SIP SRTP IP PBX, presence indication, IVR, automated phone provisioning, fax server, unified messaging, Outlook, Exchange integration, conferencing, outbound dialing Small and medium enterprise (25-256 users) 3.3.1.3177; April 2009; 7 years ago (2009-04)
Revation LinkLive Windows Server, Linux Proprietary Proprietary TLS, SRTP Secure Unified Communications, Presence, Instant Messaging/Chat, VoIP, Video, Desktop Sharing, File Sharing, IVR, PBX, Voicemail, ACD, Email Server Unified Communications Service Providers 7.0; June 2014; 2 years ago (2014-06)
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; 2 years ago (2014-07)
Unison Linux Proprietary SIP, XMPP, IMAP, SMTP, CalDAV SSL, TLS Unified messaging, IP PBX, IVR, instant messaging, calendar server, LDAP server, email server Small and medium enterprise (25-256 users) 3.0; February 2010; 6 years ago (2010-02)
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; 5 years ago (2010-11)
Yate BSD, Linux, OS X, 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 5.5; May 2015; 1 year ago (2015-05)

Secure VoIP software[edit]

VoIP software with client-to-client encryption[edit]

The following table is an overview of those VoIP clients which provide end-to-end encryption by default.

Client name Development status Open source client Contact verification Encryption protocols Forward secrecy Multiple encryption Encrypted group calling Proxy, Tor
ZRTP ECDH DTLS SRTP
FaceTime Active No[55] No[55] ? ? ? ? Yes[55] ? No No
Jitsi[a] Active Yes Yes[55] Yes No Yes Yes Yes[55] Yes Yes ?
PGPfone Abandonware Viewable source[56] Yes ? ? ? ? ? ? ? ?
Signal Active Yes Yes[55] Yes No No Yes Yes[55] Yes No No
Silent Phone Active Viewable source[57] Yes[55] Yes ? ? Yes Yes[55] Yes Yes No
Viber[30] Active No ? ? ? ? ? ? ? ? No
WhatsApp Active Partially[b][58] Yes[58] No Yes[58] No Yes[58] Yes[58] Yes[58] No No
Wire Active Yes[59] ? No[35] No Yes[35] Yes ? Yes[35] Yes[35] No
Zfone Abandonware Viewable source[60] Yes Yes Optional[61] ? Yes[62] Yes Yes ? ?

The following table is an overview of those VoIP clients which provide end-to-end encryption through an optional setting that is not enabled by default. The information in this table is only applicable when the setting is enabled.

Client name Development status Open source client Contact verification Encryption protocols Forward secrecy Multiple encryption Encrypted group calling Proxy, Tor
ZRTP ECDH DTLS SRTP
Linphone[a] Active Yes Yes Yes ? ? Yes Yes Yes ? No

VoIP software with client-to-server encryption[edit]

The following table is an overview of those VoIP clients which provide client-to-server encryption. It does not include clients that also provide end-to-end encryption.

Client name Encryption protocols
Google Hangouts[55] SRTP[63]
Skype[55] A custom protocol
Notes
  1. ^ a b Only if the user has registered with a compatible SIP provider. Some SIP providers do not support certain encryption protocols.
  2. ^ Only the encryption related source code is open.

See also[edit]

References[edit]

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  2. ^ "Download Blink". Blink Project's Website. Retrieved 22 June 2016. 
  3. ^ "Ekiga 4.0.1 [STABLE] available". www.ekiga.org. 21 February 2013. Retrieved 2014-05-09. 
  4. ^ "Telepathy Q&A from the Boston GNOME Summit". Retrieved 4 February 2014. 
  5. ^ "ANNOUNCE: Empathy 3.12.12". 13 May 2016. Retrieved 17 August 2016. 
  6. ^ Eyeball Chat 3.2 Features. EyeballlChat.com.
  7. ^ "Chrome Web Store Hangouts". Retrieved July 11, 2013. 
  8. ^ "Telephony with Lotus Sametime software". IBM.com. Retrieved 2010-02-16
  9. ^ "Jitsi (SIP Communicator) Android - Nightly Builds Index". Jitsi.org. Retrieved 2014-11-15. 
  10. ^ Interview with Emil Ivov, Deploy360 blog
  11. ^ "[#JITSI-1166] P2P IPv6 calls still do not work with explicit IPv6 addresses, no matter if brackets are used - Java.net JIRA". Java.net. Retrieved 2014-02-13. 
  12. ^ Release history on Phoner download page
  13. ^ "Supported Codecs". qutecom.org. Retrieved 19 December 2014. 
  14. ^ "Announcement: QuteCom 2.2.1". Archived from the original on 2 April 2013. 
  15. ^ Support, Skype (24 August 2016). "What's new in Skype for Windows desktop?". Skype Help. Microsoft. Retrieved 24 August 2016. 
  16. ^ Tong, Karen (3 September 2014). "Skype 1.8 for Xbox One now has photo viewing and enhanced Snap experience". Skype Blogs. Microsoft. Retrieved 10 October 2014. 
  17. ^ "Skype Preview si aggiorna per Windows 10 e Windows 10 Mobile alla versione 11.7.87 [X1]". Aggiornamenti Lumia. Aggiornamenti Lumia. 31 July 2016. Retrieved 2 August 2016. 
  18. ^ "Skype". Microsoft Store. Microsoft. Retrieved 2 August 2016. 
  19. ^ The Skype Team (16 February 2016). "What's new in Skype for Mac?". Skype Support. Microsoft. Retrieved 18 February 2016. 
  20. ^ Cimmino, Marco (18 June 2014). "Skype 4.3 for Linux". Skype Blogs. Microsoft. Retrieved 10 October 2014. 
  21. ^ The Skype Team (16 February 2016). "What's new in Skype for Android?". Skype Support. Microsoft. Retrieved 18 February 2016. 
  22. ^ "Skype for iOS". iTunes Preview. Apple Inc. Retrieved 4 April 2016. 
  23. ^ "Skype for watchOS". iTunes Preview. Apple Inc. Retrieved 4 April 2016. 
  24. ^ {{cite web |url = https://itunes.apple.com/app/skype/id304878510 |title = Skype for Fire OS |website = iTunes Preview |publisher = Apple Inc. |accessdate = 4 April 2016
  25. ^ "Skype". BlackBerry World. BlackBerry. Retrieved 14 November 2014. 
  26. ^ "New TeamSpeak3 Client and Server released today". TeamSpeak Systems GmbH. Retrieved 2015-08-04. 
  27. ^ "TeamViewer overview". GetApp. 
  28. ^ Brad Chacos, Brad. "Hands on with Viber's new desktop app: It's no Skype". www.pcworld.com. IDG Consumer & SMB. Archived from the original on 2014-07-25. Retrieved 15 November 2014. 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. 
  29. ^ Viber Unveils Desktop App
  30. ^ a b 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. 
  31. ^ Viber Media S.à r.l. (18 April 2016). "Viber - Android Apps on Google Play". Google Play. Google. Retrieved 20 April 2016. 
  32. ^ Viber Media, Inc (19 April 2016). "Viber On the App Store on iTunes". App Store. Apple. Retrieved 20 April 2016. 
  33. ^ Viber Media (2015-12-18). "Viber". Windows Phone Marketplace. Retrieved 2016-04-17. 
  34. ^ Viber Media (23 April 2014). "Viber 10 - BlackBerry World". BlackBerry App World. Research In Motion (RIM). Retrieved 20 April 2016. 
  35. ^ a b c d e f "Wire Security Whitepaper". Wire Swiss GmbH. Retrieved 13 April 2016. 
  36. ^ "JAJAH.Mobile Web". Jajah.com.
  37. ^ "Signaling Protocol". Archived from the original on 10 September 2015. Retrieved 8 November 2015. 
  38. ^ "Encryption Protocols". Archived from the original on 5 September 2015. Retrieved 8 November 2015. 
  39. ^ Michael Mimoso (29 July 2014). "New Signal App Brings Encrypted Calling to iPhone". Threatpost. Retrieved 27 January 2015. 
  40. ^ "Signal 2.0: Private messaging comes to the iPhone". whispersystems.org. Retrieved 3 March 2015. 
  41. ^ Open Whisper Systems (23 August 2016). "Signal – Private Messenger". Google Play. Google. Retrieved 27 August 2016. 
  42. ^ Open Whisper Systems (18 August 2016). "Signal - Private Messenger". App Store. Apple. Retrieved 23 August 2016. 
  43. ^ "WhatsApp Encryption Overview – Technical white paper" (PDF). WhatsApp Inc. 4 April 2016. Retrieved 9 April 2016. 
  44. ^ WhatsApp Inc. (n.d.). "WhatsApp for Android". WhatsApp.com. WhatsApp Inc. Retrieved 2 June 2016. 
  45. ^ WhatsApp Inc. (26 May 2016). "WhatsApp Messenger". Google Play. Google. Retrieved 2 June 2016. 
  46. ^ WhatsApp Inc. (3 March 2016). "WhatsApp Messenger". BlackBerry World. BlackBerry. Retrieved 12 April 2016. 
  47. ^ WhatsApp Inc. (2 April 2016). "WhatsApp Messenger". App Store. Apple. Retrieved 2 April 2016. 
  48. ^ WhatsApp Inc. (n.d.). "WhatsApp for Nokia S60". WhatsApp.com. WhatsApp Inc. Retrieved 2 June 2016. 
  49. ^ WhatsApp Inc. (n.d.). "WhatsApp for Nokia Series 40". WhatsApp.com. WhatsApp Inc. Retrieved 12 April 2016. 
  50. ^ "Pocket PC SIP Softphone". Counterpath.com.
  51. ^ "Recommended Pocket PCs". Counterpath.com.
  52. ^ http://www.mod-gadget.com/upptalk-app-updated-ipad/
  53. ^ "yuilop - Free texts and SMS". Amazon. Retrieved 10 March 2014. 
  54. ^ "Asterisk Commercial Licensing". Digium. Retrieved 12 October 2013
  55. ^ a b c d e f g h i j k "Secure Messaging Scorecard. Which apps and tools actually keep your messages safe?". Electronic Frontier Foundation. 4 November 2014. Retrieved 11 July 2016. 
  56. ^ "PGPfone". pgpi.org. n.d. Retrieved 26 August 2016. 
  57. ^ "Is Silent Phone open source?". silentcircle.com. Silent Circle. n.d. Retrieved 26 August 2016. 
  58. ^ a b c d e f "WhatsApp Encryption Overview – Technical white paper" (PDF). WhatsApp Inc. 4 April 2016. Retrieved 5 April 2016. 
  59. ^ "Wire open sourced encryption related source code in March 2016". Wire Swiss GmbH. 2016-04-13. 
  60. ^ "Is Zfone open source?". zfoneproject.com. Zfone. 2006. Retrieved 26 August 2016. 
  61. ^ "Do you support Elliptic Curve Diffie-Hellman?". zfoneproject.com. Zfone. 2006. Retrieved 26 August 2016. 
  62. ^ "Why do we need ZRTP if we already have SRTP? Isn't SRTP good enough?". zfoneproject.com. Zfone. 2006. Retrieved 26 August 2016. 
  63. ^ https://support.google.com/hangouts/answer/6046115