Computer Voip Phone 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.

  • Linphone is a free VoIP software to make voip calls over the internet. With the help of this freeware you can easily connect your close pals, relatives, friends via internet. Linphone lets you communicate with your close pals with text messaging, voice and video through internet.
  • Linphone is a free VoIP software to make voip calls over the internet. With the help of this freeware you can easily connect your close pals, relatives, friends via internet. Linphone lets you communicate with your close pals with text messaging, voice and video through internet.

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.

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.

Software

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 Desktop applications.

  • 1Desktop applications
  • 5Secure VoIP software

Desktop applications[edit]

ProgramOperating systemsLicenseCostsProtocolsCodecsEncryptionMax conference peersOther abilitiesLatest release
AudioCodes MobilityPLUSWindows, Android, iOSProprietary?SIP, RTP, XMPP, STUN, ICEG.722 wideband, G.711a, G.711u, iLBC, G.729a, SILK, GSM, VP8, H.264, OpusTLS, SRTPUnknownVoice, video, IM, Group chat, content sharing, SMS and MMS over IP services, native and social network contacts integration, incoming call/IM push notifications.2014; 5 years ago
Avaya Application Server 5300 Soft ClientWindowsProprietary?SIP, RTPUnknownTLS, SRTPUnknown2.0; 2010; 9 years ago
BlinkLinux, macOS, WindowsMixed: free software versions under GNU GPLv3 + shareware versions under gplv3 with exception of including proprietary codemacOS version proprietary on App Store, free version limited to sponsored SIP provider; Windows version proprietary; Linux version open sourceICE, SIP, MSRP, RFB (VNC), XCAPOpus, speex, G.722, GSM, iLBC, PCMU, PCMATLS, SRTP and ZRTP on all versions, OTR/SMP on Linux and macOS only[2]No limitIM, file transfer, desktop sharing, multi-party conference, widebandBlink Qt
CSipSimpleAndroidGPLFreeSIP, ICE, STUN, TURNOpus, AMR, G.711 (u-law/a-law), speex, G.722, GSM, iLBC, G.729 (need to buy a licensed plugin), iSAC, SILK (narrow-band/wide-band/ultra wide-band)SRTP, SIP over TLS 1.0 and ZRTPUnknownSIP SIMPLE messaging, Support for IPv6, Integration with Android operating system with filters and rewriting rules1.0.2; November 2014; 4 years ago
Cisco IP Communicator[3]WindowsProprietaryFree (for Cisco SMB Partners only)SCCP (Skinny), SIP, TFTP, HTTP (for XML Services)G.722 wideband, G.711a, G.711u, iLBC, iSAC, G.729a, G.729abSRTPUnlimited (with bridge), 2 otherwise[4]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, XML Services8.6.6; April 27, 2016; 3 years ago
CounterPath Corporation BriaWindows, macOS, iOS, AndroidProprietarySIP, RTP, XMPP, STUN, ICEG.722 wideband, G.711a, G.711u, iLBC, G.729a, SILK, GSM, VP8, H.264, OpusTLS, SRTP6 party voice, 3 party videoVoice and video calling, SIP and XMPP messaging support, group chat, file, image and document sharing, contact integration, incoming call/IM push notifications5.3.4 July 23, 2018; 14 months ago
DiscordmacOS, Android, iOS, Windows, LinuxProprietaryFree, Premium 'Nitro' Subscription for Additional Features.RTP, UDP, WS, HTTPSOpusTLS5,000 soft limit[5]IM, file sharing, in-game overlay02.01.2018; February 1, 2018; 19 months ago
EkigaLinux, Windows, OpenSolarisGPLFreeSIP, H.323, STUN, Zeroconf, XMPP, RTPH.263, H.264/MPEG-4 AVC, Theora, iLBC, Speex, SILK, GSM, ...NoUnknownVideo, 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; 6 years ago)[±][6]
EmpathyLinuxGPLFreeSIP, XMPP (Jingle), ICE (STUN-TURN), ZeroconfUnknownNoUnknownIM, multi-user A/V,[7] collaborative applications3.12.12[8](May 13, 2016; 3 years ago)[±]
Eyeball ChatWindowsProprietaryFreeSIP, STUN, ICE, XMPPUnknownYes5[9]IM, Conferencing, Voice, Video and SIMPLE based presenceWindows 3.2; 2009; 10 years ago
eyeBeamWindowsProprietary?SIP-SIMPLEUnknownTLS, SRTP6 party audio; 3 party videoVoice and Video calling; IM; Import Microsoft Outlook Contacts; USB Support; Call Recording and Conferencing1.5.20.1; March 2010; 9 years ago
FaceTimeiOS, macOSProprietaryFreeSIP, IETF, Signaling protocol for VoIP, STUN, TURN and ICE[disambiguation needed] IETF, technologies for traversing firewalls and NAT[disambiguation needed]H.264 Video, AAC-ELD[disambiguation needed] Audio, H.263 and VP8RTP, SRTPIETF standards for delivering real-time and encrypted media streams for VoIP.20Video, voice, conferencing, with additional tools available as 'Services'.Template:Latest stable software release/FaceTime
Google+ HangoutsLinux, Windows, macOS, Android, iOSProprietary (using libjingle)FreeXMPPH.264/SVC, H.264/AVC, H.263 and VP8SRTP10Video, chat, screen sharing, with additional tools available as 'Hangout Apps'.Google Chrome Web Store extension
2013.626.1614.1 (July 9, 2013; 6 years ago)[±][10]
IBM SametimeLinux, macOS, Windows, mobileProprietary?SIP-SIMPLE, T.120H.323TLSUnknownIM, File transfer, Voice, Presence, Server stored contact list, HTTP tunneling, plugins, embedable in Lotus Notes[11]8.5.2; May 8, 2011; 8 years ago
iCallLinux, macOS, Windows, iOS, AndroidProprietaryFreeSIP, AIM, ICQ, XMPPSpeex, CELT, WebMTLS, ZRTPNo limitVideo, file transfer, PC to phone, phone to PC, IM (MSN, AIM, ICQ, Yahoo!, XMPP, Google Talk), Voicemail7.1.522
Jami by Savoir-faire LinuxAndroid, FreeBSD, iOS, iPhone, Linux, Microsoft Windows, OS X[12]GPL3FreeSIP, RTP, STUN per account, SRV, DHT, P2PAudio: Opus, Speex, G.722, G.711, GSM, VP8, G.729, iLBC. Video: H.264, H.263, VP8, MPEG-4Voice encryption (SRTP with SDES or ZRTP) and signaling encryption (TLS), multiple realms authentication mechanismNo limitBlockchain ID-management, Gnome-KDE client, address book, multiple accounts, unlimited call number, call transfer, call hold-unhold, call recording, multi-way conferencing
iOS2.25 / August 29, 2019; 30 days ago[13]
Android20190827 / August 30, 2019; 29 days ago[14]
Windows201908271411 / August 28, 2019; 31 days ago[15]
macOS1.42 / August 28, 2019; 31 days ago[16]
JitsiLinux, macOS, Windows (all java supported). ExperimentalAndroid builds are also available.[17]ApacheFreeSIP-SIMPLE, XMPP-JingleSTUNICE, TURNSILK, G.722, Speex, Opus, G.711 (PCMU/PCMA), iLBC, GSM, G.729, H.264, H.263, VP8ZRTP, SRTP, OTR, TLSUnknownText messaging, audio-video telephony, IPv6 (often broken,[18] P2P not supported[19]), call recording, 64-bit2.10 (build.5550) (February 5, 2017; 2 years ago)[±]
KPhoneLinux (KDE)GPLFreeSIP, STUN, NAPTR-SRVUnknownSRTPUnknownVideo, voice, IM, external Sessions, IPv6 support for UDP1.2 (November 2008)
Librestream Onsight ConnectWindows, Android, iOSProprietary?SIP, RTP, STUNG.711, H.264, MPEG, and othersTLS, SRTPUnknownVoice, video, conferencing, image sharing, incoming call/IM push notifications.February 27, 2018; 19 months ago
LinphoneLinux, Windows, macOS, Android, iPhone, BlackBerryGPLFreeSIPSpeex, Opus, G711, GSM, G.722, VP8 (WebM), H263, MPEG4, Theora and H264 (plugin)TLS, SRTP, ZRTPUnknownVideo, IM, STUN, IPv6 (disables IPv4 support when enabled, P2P supported only by version 3.5.1-2)3.11.1; March 10, 2017; 2 years ago
MessagesmacOSProprietaryFree, only macOS and iOSH263, H264UnknownUnknownIntegrated, PBX independent7.0; July 25, 2012; 7 years ago
MicroSIPWindowsGPLFreeSIP, STUN, ICE, SIMPLESpeex, iLBC, GSM, G.711, G.722, G.729, SILK, Linear PCMTLS, SRTPUnknownVideo, voice, IM and Presence3.19.15 May 2019; 4 months ago
Mirial Softphone (Mirial s.u.r.l.)Windows 2000-XP-2003-Vista-7 (including 64-bit versions), macOS (x86)Proprietarynot freeSIP, RTSPH.323DTLS-SRTPUnknownH.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; 9 years ago, discontinued
MumbleLinux, macOS, iOS, Windows, AndroidNew BSD licenseFreeICECELT, Speex, OpusTLS and OCB-AES128No 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-Activation1.2.19; January 27, 2017; 2 years ago
NymgoWindows, Android, iOSProprietaryFreeSIP, RTP and RTCPUnknownYesNoAddress Book integration, Call recording/export, Mute, On Hold, Caller ID definition4.2.9; March 2013; 6 years ago
oovoomacOS, iOS, Windows, AndroidProprietaryFreeSIP, RTP and RTCPUnknownYes12Address Book integration, Call recording/export, Mute, On Hold, Caller ID definition4.2.9; March 2013; 6 years ago
PhonerWindowsProprietaryFreeSIP, TAPI, CAPIG.711a, G.711u, G.722, G.726, G.729, GSM, iLBC, speex, OpusTLS, SRTP, ZRTP8Conferencing, call redirection, call recording3.21 (18 January 2019; 8 months ago)[±][20]
PhonerLiteWindowsProprietaryFreeSIPG.711a, G.711u, G.722, G.726, G.729, GSM, iLBC, speex, OpusTLS, SRTP, ZRTP8Conferencing, call redirection, call recording2.72 (23 May 2019; 4 months ago)[±][21]
QuteComLinux, macOS, Windows XP-2000GPLFreeSIPG.711, G.729, iLBC, AMR-NB, G.722, Speex, AMR-WB (G.722.2), H.263, H.263+, H.264, Dirac[22]SRTP, but key exchange via Everbee key Exchange which is not a StandardUnknownVideo, IM (MSN, AIM, ICQ, Yahoo!, XMPP, Google Talk), voicemail, wengo to phone, conferencing.2.2.1 (22 June 2011; 8 years ago[23])[±]
Roger Wilco GameSpyWindowsProprietary?Proprietary????2001; 18 years ago
SignalLinux, macOS, Windows, Android, iPhone{{open source, The clients are published under the GPLv3 license, while the server code is published under the AGPLv3 license}}Free<to be completed><to be completed><to be completed><to be completed>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.
Android4.47.6 / September 16, 2019; 12 days ago[24]
iOS2.43.1 / September 25, 2019; 3 days ago[25]
Desktop1.27.3 / September 26, 2019; 2 days ago[26]
SkypeLinux(with limited functionality),[27]macOS, Windows 2000-XP-Vista-7-Mobile (unsupported), BREW, Windows Phone , Android, iPhone, PSPProprietaryFreeProprietary P2P protocol [a]SILKTLS25 starting with version 3.6.0.216. 10 with 2.xConferencing, video, file transfer, voicemail, Skype to phone, phone to Skype, additional P2P extensions (games, whiteboard, etc...); depending on platform.
Windows, UWP14.52.138.0 / 16 September 2019; 12 days ago[28]
Windows, desktop8.52.0.138 / 16 September 2019; 12 days ago[28]
macOS8.52.0.138 / 16 September 2019; 12 days ago[28]
Linux8.52.0.138 / 16 September 2019; 12 days ago[28]
Android8.52.0.138 / 16 September 2019; 12 days ago[29]
iOS8.52.0.138 / 16 September 2019; 12 days ago[30] (iPhone), [31] (iPad)
TeamSpeakLinux, Windows, macOS, FreeBSD, Android, iOSProprietaryFreeUnknownCELT, Speex, Opus[32]Yes32 unlicensed, 512 with non-profit license, 2000Simultaneous 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 system3.3
TeamTalkLinux, Windows, macOS, Android, iOS, RaspbianProprietaryFreeProprietaryOpus, Speex, WebMNo1000Video, file sharing, desktop sharing, stream media files (MP3, AVI)5.3.3; November 2018; 10 months ago
TeamViewerLinux, Windows, macOS, iOS, Android[33]ProprietaryFree (personal use only)UnknownUnknownAES256UnknownUnknown
Windows (desktop app)14.5.5819 / August 29, 2019; 30 days ago[34]
macOS14.5.5819 / September 3, 2019; 25 days ago[35]
Linux14.5.5819 / September 3, 2019; 25 days ago[36]
Android14.5.224 / August 20, 2019; 39 days ago[37]
iOS14.5.1 / August 20, 2019; 39 days ago[38]
Windows (UWP app)14.100.134887[39]
BlackBerry OS12.0.0.6394 / February 1, 2017; 2 years ago[40]
Chrome OS14.0.47319 / October 22, 2018; 11 months ago[41]
TelephonemacOS 10.10.2BSDFreeSIP, STUN, ICEUnknownNoUnknownAddress Book integration1.1.4; March 6, 2012; 7 years ago
Toktumi Unlimited, Line2 ProWindows XP-Vista-7, macOS, iOS, AndroidProprietaryFreeProprietary with SIP coreUnknownUnknown20Conferencing, voicemail, caller ID, call-waiting, address book integration; auto-attendant, call-forwardingWindows; August 2010; 9 years ago; macOS; October 2010; 8 years ago
ToxLinux, macOS, Windows, Android, FreeBSDGPLFreeTox, VP8Opus,NaClUnknownVoice, video, instant messaging, file transfersUnknown
Tru AppWindows 2000-XP-Vista-7, macOS, Linux
iOS, Android, Symbian, BlackBerry OS,		ProprietaryFreeSIP, XMPPUnknownUnknownUnknownChat, file transfer, voicemail, inbound numbers, integration with GTalk, Microsoft Live, Skype
TuentiAndroid, iPhone, Windows PhoneProprietaryFreeWebRTC, SIP, XMPPiLBC, OpusYes?Voice, video, Instant messaging, group chat, photo and video sharing, SMS and MMS, native and social network contacts integration, incoming call/IM push notifications.
TwinkleLinuxGPLFreeSIPG.711 A-law μ-law, G.726, GSM, iLBC, Speex narrow wide ultrawideSRTP, ZRTP3Conferencing, chat, file transfer, Firefox integration, call redirection, voicemail, support of VoIP-to-Phone services1.10.2 (February 14, 2019; 7 months ago)[±]
VentrilomacOS, Windows, iOS, AndroidProprietaryFreeUnknownUnknownNo8Conferencing, chat, text-to-speech3.0.8
ViberLinux,[b]macOS,[b]Windows,[b]Android, Bada, BlackBerry OS, iOS, Series 40, Symbian, Windows PhoneProprietary?UnknownUnknownYes[44]UnknownVaries by platform: Text, picture and video messaging on all, voice calling only on iPhone, Android and Microsoft's Windows Phone
Android11.5.0.6 / September 9, 2019; 19 days ago[45][46]
iOS11.5.1 / September 15, 2019; 13 days ago[47]
Windows11.5 / September 11, 2019; 17 days ago[48]
VonageLinux, macOS, Windows, Android, iOSProprietarynot freeSIP, STUN, ICE, TURNAudio: Opus, G.711

Video: VP8

SRTP50VoIP , video, instant messaging, presence (SIP SIMPLE), PSTN (inbound and outbound), call waiting, call hold, call forwarding, voicemail, message-waiting indication, 3-way conferencing, contacts integration, receptionist console, video, group chat, content sharing, SMS over IP services, native and social network contacts integration, incoming call/IM push notifications, fax, file sharing, screen sharing (desktop only), number programmability.
WireLinux, Windows, macOS, iOS, Android, WebGPLv3not free?Template:Opus (audio), VP8 (video)DTLS, SRTP[49]10[50]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)?
X-LitemacOS, WindowsProprietaryFreeSIP, STUN, ICE, TURNH.263, H.263+, G.711, iLBC, SpeexNo3VoIP 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)5.3.3 July 10, 2018; 14 months ago
Yahoo! MessengerClassic Mac OS (8, 9), macOS, Windows, (Linux, FreeBSD version VoIP incapable)ProprietaryFreeSIP (using TLS) and RTP (media)UnknownUnknownUnknownVideo, file transfer, PC to phone, phone to PCWindows: 11.5.0.228; May 31, 2012; 7 years ago
Mac: 3.0.1; July 20, 2011; 8 years ago
Linux: 1.0.6; September 2003; 16 years ago
SunOS 5.7: 0.99.17-1; September 2003; 16 years ago
Solaris 8: 1.0.4; September 2003; 16 years ago
FreeBSD 4-5: 1.0.4; September 2003; 16 years ago
iOS: 2.2.6; July 12, 2012; 7 years ago
Yate ClientLinux, macOS, WindowsGPLFreeSIP, IAX, XMPP, H.323G.711a, G.711u, GSM 06.10, iLBC, Speex, G.723, G.726, G.728, G.729SRTP, maybe ZRTP?Unknown6.0.0; September 2017; 2 years ago
ZfoneLinux, macOS, WindowsViewable sourceIncludes time bomb provisionSIP, RTPUnknownSRTP, ZRTPUnknownBeta 2008-09-04 (Linux 0.9.224), (macOS 0.9.246), (Windows 0.9.206)

Computer Voip Phone Software Online

  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. ^ abcViber must be first installed on a mobile phone to function on a desktop operating system[42][43]

Discontinued softphone service[edit]

Mobile phones[edit]

For mobile VoIP clients:

Free Voip On Computer

ProgramOperating systemsLicenseOpen sourceProtocolsCodecsEncryptionOther abilitiesLatest release
Acrobits SoftphoneAndroid v2.2+, iOS v7.0+ProprietaryNoSIPG.711, G.722, iLBC, GSM, G.729TLS, SRTP, ZRTPVOIP over Wi-Fi or 3G iOS only: push notifications, video, number rewriting, address book matching, sms for betamax providers and pennytelAcrobits Softphone: 3.20 (Android), 5.2 (iOS)
CounterPath Corporation BriaAndroid v4.4+, iOS v10+ProprietaryNoSIPG.722 wideband, G.711a, G.711u, iLBC, G.729a, SILK, GSM, VP8, H.264, OpusTLS, SRTP, ZRTPVoice and video calling, SIP and XMPP messaging support, group chat, file, image and document sharing, contact integration, incoming call/IM push notifications.5.3.4 July 23, 2018; 14 months ago
CSipSimpleAndroidGPLYesSIPOpus, AMR-WB, G.722, iSAC, iLBC, Speex, Silk, Codec2, G.726, G711 (PCMA & PCMU), AMR, GSMSRTP, SIP over TLS 1.0 and ZRTP?1.02.02
Google DuoiOS, AndroidProprietary, freewareNoWebRTC??One-to-one voice and video calling.
Android62.0.267242088.DR62_RC08 / September 4, 2019; 24 days ago[51]
iOS38.4 / August 22, 2018; 13 months ago[52]
iCall MobileiOS v4.3+Proprietary, freewareNoSIPAIMICQXMPP, Facebook, Yahoo! Messenger, Windows LiveSpeex, CELT, WebMTLS, ZRTPVoIP over Wi-Fi or 3G, SMS, voicemail2.0.1; April 2012; 7 years ago
Jajah Mobile WebSymbian, Windows Mobile (version unknown)ProprietaryNo???web based service, Call back,no download[53]?
JusTex by JuphoonAndroid, iOS v5.1+ProprietaryNoSIPPCMA, PCMU, G.722, iLBC, iSAC, Opus, H.264, VP8, H.263TLS, TCP, UDP, SRTPJusTex Softphone over Wi-Fi or 3G, HD voice and video call, Multiparty call, conference.3.0.1 (iOS); July 13, 2014; 5 years ago; 3.0 (Android); July 9, 2014; 5 years ago
LineAndroid, iOSProprietaryNo????
Line2Android, iOSProprietary, freewareNoProprietary with SIP core??Tri-mode calling (cellular, 3G/4G data, Wi-Fi), SMS over IP, visual voicemail, 20-person conference calls, auto-attendant, call-forwarding1.0.4 Android, 3.2.1 iOS
Media5-foneiOS, AndroidProprietaryNoSIPPCMA, 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 Signal MessengeriOS, AndroidGPLv3YesWebRTC[54]Opus[54]TLS, Signal Protocol[54]End-to-end encryption by default for everything. CallKit and location privacy,[55] one-to-one and group messaging, video calling,[55] image/video sharing, timed messages, identity verification, screenshot blocking. Android only: SMS/MMS messaging, doodling,[56] GIF sharing.[57]
Android4.47.6 / September 16, 2019; 12 days ago[58]
iOS2.43.1 / September 25, 2019; 3 days ago[59]
Desktop1.27.3 / September 26, 2019; 2 days ago[60]
SipdroidAndroidGPLYesSIP??Uses Wi-Fi, 3G or EDGE2.7
Tango by TangoME Inc.iOS, Android, Microsoft Windows, macOS, Windows PhoneProprietary, freeware????VoIP, Wi-Fi out & in, SMS over IP, call-through & call-back, instant messaging, videoconferencing?
TruphoneNokia-Symbian, iOS, Android, BlackBerryProprietary, freewareNoSIP??VoIP, Wi-Fi out & in, SMS over IP, call-through & call-back, connection management, provisioningSymbian 4.0, iOS 1.11.1
VopiumSymbian, Java ME, Android, BlackBerry RIM, iOS, Windows Mobile 2003 SE and higherProprietary, freewareNoSIP, MSN, Skype, Yahoo, AOL, ICQ, Google Talk, Facebook & TwitterGSM?Wi-Fi VoIP, GSM call-through, SMS over IP, least cost routing, synchronising-backup mobile contacts and calendar2.0
WhatsApp

Android, BlackBerry, iOS, Symbian, Windows Phone

Proprietary, freewareNo??ECDH, SRTP[61]VoIP and instant messaging over Wi-Fi or a data connection.
iOS2.19.92 / September 15, 2019; 13 days ago[62]
Android2.19.258 / September 18, 2019; 10 days ago[63]
Windows Mobile 6Windows Mobile 6 Professional/StandardProprietaryNoSIP to publicly and non-publicly routable servers??6.1
X-PRO for Pocket PCWindows Mobile 2003 (earlier versions support Windows PocketPC 2002)Proprietary, discontinued in April 2007[64]NoSIP??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.[65]2.2
YuilopAndroid, iOS, Windows Phone, BlackBerry OSProprietary, freewareNoXMPP, RTPiLBCTLSVoIP over 3G-4G-LTE and Wi-fi, SMS, group chat, photo sharing, Location sharing, virtual phone numbersiOS 2.4 (November 26, 2014; 4 years ago[66])[±]

Android 2.0.2 (February 12, 2014; 5 years ago)[±]
Windows Phone 7.x 1.0.1.7 (September 12, 2013; 6 years ago)[±]
Windows Phone 8.x 1.0.0.4 (September 18, 2013; 6 years ago)[±]
BlackBerry OS 1.0.1 (May 31, 2013; 6 years ago)[±]
Kindle Fire 2.0 (December 19, 2013; 5 years ago[67])[±]

Frameworks and libraries[edit]

ProgramOperating systemsLicenseProtocols, based on, compatible withEncryptionOther abilitiesKey and target marketsLatest release
TapiocaLinuxGPLTelepathy (software)No0.3.9; June 12, 2006; 13 years ago
Telepathy, FarstreamLinux, macOS, WindowsLGPLSIP, XMPP (Jingle), ICE (STUN/TURN), UPnPNoMulti-user A/V conferencing, IM, collaborative applicationsMobile devices (Maemo, Meego), Linux desktop or embeddedspec 0.27.2; September 24, 2013; 6 years ago
OPALWindows, Linux (including embedded variants), macOSMPLSIP, H.323, IAX2, CAPI, VXMLUnknownMulti-user A/V conferencing, IM, IVRSoftphones, softswitches, telephony application servers3.14.3; October 10, 2014; 4 years ago
GNU oSIPLinux, Windows, macOS, Android, iPhone, BlackBerryLGPLSIP, SDPUnknownMulti-user A/V conferencing, IM, IVRSoftphones, embedded and mobile devices, telephony application servers4.1.0; December 18, 2013; 5 years ago

Server software[edit]

ProgramOperating systemsLicenseProtocols, based on, compatible withEncryptionOther abilitiesKey and target marketsLatest release
3CX Phone SystemWindows, LinuxProprietarySIPTLS, SRTPVoice and video IP telephony and conferencing, voice mail and instant messaging< 50,000 users16.2 ; July 5, 2019; 2 months ago
AS5300Linux, Windows Server 2003ProprietarySIP, UNIStim, MLPPSSL, TLS,

SRTP, SDESC

Voice and Video IP telephony, Voice and Video conferencing, voice mail and instant messaging1,000 - 25,000 users1.0; January 2008; 11 years ago
AskoziaPBXno additional OS required (Linux based)GPL, Open coreSIP, H.323, IAX, SCCPNoISDN, analog, Voicemail, Conferencing, MOH, ACD, IVR, Call forwarding, Call recordingSMEs up to 50 users2.2.2; December 2012; 6 years ago
Asterisk PBXLinux, BSD, macOS, SolarisGPL, optional: Proprietary[68]SIP, H.323, IAX, MGCP, VOFR, XMPP, Google Talk, TDMTLS, SRTPVoIP 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 distributionEnthusiasts, developers, enterprise users (capacity dependent on server design, scalable across multiple servers)16.5.0 (25 July 2019; 2 months ago[69])[±]

15.7.3 (11 July 2019; 2 months ago[70])[±]13.28.0 (25 July 2019; 2 months ago[71])[±]


Brekeke SIP ServerLinux, WindowsProprietarySIPTLS, SRTPSIP Registrar, SIP ProxySIP Service Providers, VoIP service providers, Healthcare, Security3.9.1.3; December 21, 2018; 9 months ago
Brekeke PBXLinux, WindowsProprietarySIPTLS, SRTPVoice and Video IP telephony, Voice and Video conferencing, and voice mailHosted service providers, Mid-large enterprise3.9.1.4; December 27, 2018; 9 months ago
CallMax SoftswitchLinuxProprietarySIP, H.323SSL, TLS, HTTPSIntegrated 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 users3.6; October 2015; 3 years ago
CommuniGate ProLinux, BSD, macOS, Windows, Solaris, HPUX, AIXProprietarySIP, XIMSS Protocol, XMPP, WebRTCSSL, TLS, SRTPSIP Registrar/Proxy, Authentication, Diameter, RADIUS, ENUM, many othersCarriers, enterprises, MNOs, ISPs, SaaS providers6.1.11; June 2016; 3 years ago
Dial-Gate Softswitch PBXLinux, WindowsProprietarySIPTLS, SRTPBilling server, real-time account and line monitoring, web-based user interfaceSoftswitch users, service providers4.3; June 2014; 5 years ago
Dial-Office IP-PBXLinux, WindowsProprietarySIPTLS, SRTPUnified Communications, Conferencing, remote worker support and voice mailSmall businesses, Mid-large enterprises4.1; December 2013; 5 years ago
ElastixLinuxGPLSIP, IAX, H323, XMPPTLS, SRTPUnified communication server that also supports chat, mail and fax.Capacity dependent on server design, scalable across multiple servers2.5.0 (stable), 3.0.0 (stable), 4.0.0 (stable); February 10, 2016; 3 years ago
FreeSWITCHLinux, BSD, macOS, Solaris, WindowsMozilla Public LicenseSIP, NAT-PMP, STUN, SIMPLE, XMPP, Google Talk (Jingle), IAX, H.323, MRCP, RSS, SkypeTLS, SRTP, ZRTPRecording, Voicemail, Conferencing, RADIUS, ENUM, IM Proxy, Streaming, Media gateway, Soft-PBX, IVR (modular)Large soft-switch users, home PBX users, softphone users1.8.7 (July 2, 2019; 2 months ago)[±]
FreePBXLinux, BSD, SolarisGPLSIP, IAX, H323, XMPPTLS, SRTPComplete PABX Service, based on Asterisk and PHP 5.6; provides a full replacement for a legacy non-VoIP phone system; under current and active developmentScales from Raspberry PI (3 users) to multiple parallel clusters (10K+ simultaneous calls)14.0; August 2017; 2 years ago
GNU GatekeeperLinux, FreeBSD, macOS, Windows XP-2000-Vista-7GPLH.323H.235H.460.18 firewall traversal, routing, accountingvideo conferencing, VoIP carriers large and small3.7; August 15, 2014; 5 years ago
HERO Hosted PBXLinux, WindowsProprietarySIPTLS, SRTPUnified Communications, billing server, cloud-based management and web interfaceMid-large enterprises, VoIP carriers and service providers, telecom operators4.3; December 2013; 5 years ago
Kerio OperatorLinux, VMProprietarySIPSSL, TLS, SRTPintegrated 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, complementary desktop Softphone appSME2.5.2; November 15, 2016; 2 years ago
MediaCore SBCLinuxProprietaryH.323, SIP, SMPPSSL, TLS, HTTPSDynamic routing mechanism including LCR, Jurisdictional routing support, A-number based routing for EU-based providers), integrated billing, SIP-H.323 protocol converter, Transcoding - codec converter module, Guardian - revenue assurance module, SBC functionality, full and media proxy, Carrier SMS supportTransit VoIP services providers, VoIP wholesale carriers, VoIP termination providers, SMS carriers4.6.1; May 2017; 2 years ago
MurmurLinux, BSD, macOS, WindowsBSD, GPLCELT, Speex, OpusTLSChat with (limited) embedded HTML, ACLs for user management, Customizable In-Game Overlay, Directional Audio, Plugin Support, Nested ChannelsIndividuals to Small and medium enterprise (25-5000 users)1.2.17; September 24, 2016; 3 years ago
MysipswitchLinuxBSDSIP, AjaxSSLSIP proxy server which allows the use of multiple SIP accounts with a single SIP loginIndividualsAugust 2007; 12 years ago
Objectworld UC ServerWindows XP-2003-2008ProprietarySIPNoIP PBX, personal assistants, IVR, automated phone provisioning, fax server, unified messaging, Outlook, Exchange and Lotus Domino-Notes integration, conferencing, outbound dialingSmall and medium enterprise (25-2000 users)4.4.2; May 2009; 10 years ago
Kamailio, OpenSIPS (formerly named OpenSER)Linux, BSD, SolarisGPLSIP, XMPPTLS, SRTPSIP registrar-proxy, authentication, Diameter, RADIUS, ENUM, least-cost-routing, many othersSIP Service Providers4.0.1 (25 April 2013; 6 years ago)[±]
PbxnsipLinux, BSD, macOS, WindowsProprietarySIPSRTPIP PBX, presence indication, IVR, automated phone provisioning, fax server, unified messaging, Outlook, Exchange integration, conferencing, outbound dialingSmall and medium enterprise (25-256 users)3.3.1.3177; April 2009; 10 years ago
SIP Express Router (SER)Linux, BSD, SolarisGPLSIPNoSIP Registrar/Proxy, Authentication, Diameter, RADIUS, ENUM, many othersSIP Service Providers2.0.0 Ottendorf
sipXecs IP PBXLinuxAGPLNative SIP call control, XMPPTLS, SRTPFull redundancy (HA), instant messaging, voicemail, user portal, admin GUI, plug & play management including phones and gateways, fully featuredEnterprises between 10 and 10,000 users, multi-site14.04.2; July 2014; 5 years ago
vzRoomWindowsProprietarySIPSSL, TLS, AESInstant messaging-chat, VoIP, video, sharing (desktop, video, file), whiteboard, scheduler, recordingIndividual to small and medium enterprise (2-1,000 users)0.8.8.735; November 2010; 8 years ago
YateBSD, Linux, macOS, WindowsGPLSIP, 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, MAPCAMELSSL, TLS, SRTPVoice, 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 cardsDeployed on home servers and large networks with millions of users5.5; May 2015; 4 years ago

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.

Client nameDevelopment statusOpen source clientEnd-to-end authentication[a]Encryption protocolsForward secrecyMultiple encryptionEncrypted group callingProxy, Tor
ZRTPECDHDTLSSRTP
FaceTimeActiveNo[72]No[72]????Yes[72]?NoNo
Google DuoActiveNoNo??????NoNo
Jitsi[b]ActiveYesYes[72]YesNoYesYesYes[72]YesYes?
Line[73][74]ActiveNo???????No[73]No
Linphone[b]ActiveYesYesYes?YesYesYesYes?No
PGPfoneAbandonwareViewable source[75]Yes????????
SignalActiveYesYes[72]NoYesNoYesYes[72]YesNoDepends[76]
Silent PhoneActiveViewable source[77]Yes[72]Yes??YesYes[72]YesYesNo
TelegramActiveYesYes[78]NoNoNoNoYes?NoNo
ThreemaActivePartially[c][79]Yes[80]NoYes[80]Yes[80]Yes[80]Partially[d][80]YesNoNo
Viber[44]ActiveNo????????No
WhatsAppActivePartially[c][81]Yes[81]NoYes[81]NoYes[81]Yes[81]Yes[81]NoNo
WireActiveYesYes[82]No?Yes[49]Yes[49]?YesYesNo
ZfoneAbandonwareViewable source[83]YesYesOptional[84]?Yes[85]YesYes??

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

Free Voip Software For Pc

The following table is an overview of those VoIP clients which provide client-to-server encryption.

Client nameEncryption protocols
Google Hangouts[72]SRTP[86]
Skype[72]A custom protocol

Computer Voip Phone Software 2017

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

See also[edit]

References[edit]

  1. ^ ab'Skype Connect...'skype.com. Microsoft Corporation Inc. Archived from the original on 2014-11-11. Retrieved 15 November 2014.
  2. ^'Download Blink'. Blink Project's Website. Retrieved 22 June 2016.
  3. ^'Release Notes for Cisco IP Communicator 8.6.6'. Cisco. Retrieved 2018-04-03.
  4. ^'Cisco IP Communicator 8.6'. Cisco. Retrieved 2018-04-03.
  5. ^'Discord on Twitter'. Twitter. Retrieved 2016-12-29.
  6. ^'Ekiga 4.0.1 [STABLE] available'. www.ekiga.org. 21 February 2013. Retrieved 2014-05-09.
  7. ^'Telepathy Q&A from the Boston GNOME Summit'. Retrieved 4 February 2014.
  8. ^'ANNOUNCE: Empathy 3.12.12'. 13 May 2016. Retrieved 17 August 2016.
  9. ^Eyeball Chat 3.2 FeaturesArchived 2009-03-21 at the Wayback Machine. EyeballlChat.com.
  10. ^'Chrome Web Store Hangouts'. Retrieved July 11, 2013.
  11. ^'Telephony with Lotus Sametime software'. IBM.com. Retrieved 2010-02-16
  12. ^'News'. Ring. 2018-07-25. Retrieved 2018-12-01.
  13. ^'‎Jami'. App Store. Retrieved 2019-08-29.
  14. ^'Jami - Apps on Google Play'. play.google.com. Retrieved 2019-08-30.
  15. ^'Index of /windows'. dl.ring.cx. Retrieved 2019-08-27.
  16. ^'‎Jami'. Mac App Store. Retrieved 2019-08-28.
  17. ^'Jitsi (SIP Communicator) Android — Nightly Builds Index'. Jitsi.org. Retrieved 2014-11-15.
  18. ^Interview with Emil Ivov, Deploy360 blog
  19. ^'[#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.
  20. ^Release history on Phoner download page
  21. ^Changelog on PhonerLite download page
  22. ^'Supported Codecs'. qutecom.org. Retrieved 19 December 2014.
  23. ^'Announcement: QuteCom 2.2.1'. Archived from the original on 2 April 2013.CS1 maint: unfit url (link)
  24. ^Signal Foundation (2019-09-16). 'Signal Private Messenger'. Google Play Store. Retrieved 2019-09-17.
  25. ^Quiet Riddle Ventures LLC (2019-09-25). 'Signal - Private Messenger'. Apple App Store. Retrieved 2019-09-25.
  26. ^Open Whisper Systems (2019-09-26). 'Releases - signalapp/Signal-Desktop'. GitHub. Retrieved 2019-09-26.
  27. ^http://opensourceforu.com/2017/06/microsoft-retire-skype-linux-app-july-1/
  28. ^ abcd'Release Notes for Skype for Windows, Mac and Linux'. Skype Support.
  29. ^'Release Notes for Skype on Mobile'. Skype Support.
  30. ^'‎Skype for iPhone'. App Store. Retrieved 2019-09-17.
  31. ^'‎Skype for iPad'. App Store. Retrieved 2019-09-17.
  32. ^'New TeamSpeak3 Client and Server released today'. TeamSpeak Systems GmbH. Retrieved 2015-08-04.
  33. ^'TeamViewer overview'. GetApp.
  34. ^'TeamViewer'. TeamViewer. 29 August 2019.
  35. ^'TeamViewer for Mac'. TeamViewer. 3 September 2019.
  36. ^'TeamViewer'. TeamViewer. 3 September 2019.
  37. ^'TeamViewer'. GooglePlay. Google. Retrieved 20 August 2019.
  38. ^'TeamViewer: Remote Control'. App Store. Apple. Retrieved 20 August 2019.
  39. ^'TeamViewer: Remote Control'. Windows Store. Microsoft. Retrieved 20 March 2019.
  40. ^'TeamViewer: Remote Control'. BlackBerry World. BlackBerry Limited. Retrieved 18 December 2017.
  41. ^'TeamViewer'. Chrome Web Store. Google. Retrieved 15 November 2018.
  42. ^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.
  43. ^Viber Unveils Desktop App
  44. ^ abLunden, 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.
  45. ^'Viber Messenger - Messages, Group Chats & Calls - Apps on Google Play'. play.google.com. Retrieved 2019-09-04.
  46. ^'Viber Messenger - Messages, Group Chats & Calls APKs'. APKMirror. Retrieved 2019-09-04.
  47. ^'‎Viber Messenger: Chats & Calls'. App Store. Retrieved 2019-09-15.
  48. ^'Viber Support portal'. Viber Support. Retrieved 2019-09-11.
  49. ^ abc'Wire Security Whitepaper'. Wire Swiss GmbH. Retrieved 13 April 2016.
  50. ^'Wire on Twitter'. Twitter. Retrieved 2017-02-28.
  51. ^'Google Duo'. APKMirror. Android Police. March 11, 2018. Retrieved March 11, 2018.
  52. ^'Google Duo - Video Calling'. App Store. Apple Inc. March 11, 2018. Retrieved March 11, 2018.
  53. ^'JAJAH.Mobile Web'Archived 2009-06-29 at the Wayback Machine. Jajah.com.
  54. ^ abcMarlinspike, Moxie (14 February 2017). 'Video calls for Signal now in public beta'. Open Whisper Systems. Retrieved 22 March 2017.
  55. ^ abMarlinspike, Moxie (13 March 2017). 'Video calls for Signal out of beta'. Open Whisper Systems. Retrieved 22 March 2017.
  56. ^Marlinspike, Moxie (21 December 2016). 'Doodles, stickers, and censorship circumvention for Signal Android'. Open Whisper Systems. Retrieved 22 March 2017.
  57. ^Marlinspike, Moxie (1 November 2016). 'Signal and GIPHY'. Open Whisper Systems. Retrieved 22 March 2017.
  58. ^Signal Foundation (2019-09-16). 'Signal Private Messenger'. Google Play Store. Retrieved 2019-09-17.
  59. ^Quiet Riddle Ventures LLC (2019-09-25). 'Signal - Private Messenger'. Apple App Store. Retrieved 2019-09-25.
  60. ^Open Whisper Systems (2019-09-26). 'Releases - signalapp/Signal-Desktop'. GitHub. Retrieved 2019-09-26.
  61. ^'WhatsApp Encryption Overview – Technical white paper'(PDF). WhatsApp Inc. 4 April 2016. Retrieved 9 April 2016.
  62. ^'‎WhatsApp Messenger'. App Store. Retrieved 2019-09-15.
  63. ^'WhatsApp Messenger APKs'. APKMirror. Retrieved 2019-09-18.
  64. ^'Pocket PC SIP Softphone'. Counterpath.com.
  65. ^'Recommended Pocket PCs'. Counterpath.com.
  66. ^http://www.mod-gadget.com/upptalk-app-updated-ipad/
  67. ^'yuilop - Free texts and SMS'. Amazon. Retrieved 10 March 2014.
  68. ^'Asterisk Commercial Licensing'. Digium. Retrieved 12 October 2013
  69. ^'ChangeLog-16-current'. Retrieved 16 August 2019.
  70. ^'ChangeLog-15-current'. Retrieved 16 August 2019.
  71. ^'ChangeLog-13-current'. Retrieved 16 August 2019.
  72. ^ abcdefghijk'Secure Messaging Scorecard. Which apps and tools actually keep your messages safe?'. Electronic Frontier Foundation. 4 November 2014. Retrieved 11 July 2016.
  73. ^ ab''Letter Sealing' End-to-End Encryption Indicator Icon Introduced to LINE Messaging App'. Line Corporation. 10 August 2016. Retrieved 29 September 2016.
  74. ^Shin, Ki Bin (11 August 2016). 'The next step for even safer messaging: Letter Sealing'. Line Corporation. Retrieved 30 September 2016.
  75. ^'PGPfone'. pgpi.org. n.d. Archived from the original on 9 November 2000. Retrieved 26 August 2016.
  76. ^Marlinspike, Moxie (13 March 2017). 'Video calls for Signal out of beta'. Open Whisper Systems. Retrieved 30 March 2017.
  77. ^'Is Silent Phone open source?'. silentcircle.com. Silent Circle. n.d. Retrieved 26 August 2016.
  78. ^'Voice Calls: Secure, Crystal-Clear, AI-Powered'. Telegram. 30 March 2017. Retrieved 30 March 2017.
  79. ^'Where can I find Threema's source code?'. threema.ch. Threema. n.d. Retrieved 30 October 2017.
  80. ^ abcde'Threema cryptography whitepaper'(PDF). threema.ch. Threema. n.d. Retrieved 30 October 2017.
  81. ^ abcdef'WhatsApp Encryption Overview – Technical white paper'(PDF). WhatsApp Inc. 4 April 2016. Retrieved 5 April 2016.
  82. ^'A major upgrade to calling'. Medium. Wire Swiss GmbH. 14 March 2017. Retrieved 14 March 2017.
  83. ^'Is Zfone open source?'. zfoneproject.com. Zfone. 2006. Retrieved 26 August 2016.
  84. ^'Do you support Elliptic Curve Diffie-Hellman?'. zfoneproject.com. Zfone. 2006. Retrieved 26 August 2016.
  85. ^'Why do we need ZRTP if we already have SRTP? Isn't SRTP good enough?'. zfoneproject.com. Zfone. 2006. Retrieved 26 August 2016.
  86. ^https://support.google.com/hangouts/answer/6046115
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