Building Telephony Systems With Opensips Pdf Creator
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.
FreeSWITCH provides building blocks from which applications – such as a PBX, a voicemail system, a conferencing system or a calling card – can be built using any of the supported languages. Derived products. FreeSWITCH is a core component in many PBX in a box commercial products and open-source projects. Some of the commercial products are.
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.
- 1Softphone applications
- 5Secure VoIP software
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; 5 years ago | ||||||||||||||||
| Avaya Application Server 5300 Soft Client | Windows | Proprietary | ? | SIP, RTP | Unknown | TLS, SRTP | Unknown | 2.0; 2010; 9 years ago | |||||||||||||||||
| 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 only[2] | No limit | IM, file transfer, desktop sharing, multi-party conference, wideband | Blink Qt | ||||||||||||||||
| CSipSimple | Android | GPL | Free | SIP, ICE, STUN, TURN | Opus, 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 ZRTP | Unknown | SIP SIMPLE messaging, Support for IPv6, Integration with Android operating system with filters and rewriting rules | 1.0.2; November 2014; 4 years ago | ||||||||||||||||
| Cisco IP Communicator[3] | Windows | Proprietary | Free (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.729ab | SRTP | Unlimited (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 Services | 8.6.6; April 27, 2016; 3 years ago | ||||||||||||||||
| CounterPath Corporation Bria | Windows, macOS, iOS, Android | Proprietary | SIP, RTP, XMPP, STUN, ICE | G.722 wideband, G.711a, G.711u, iLBC, G.729a, SILK, GSM, VP8, H.264, Opus | TLS, SRTP | 6 party voice, 3 party video | Voice 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; 13 months ago | |||||||||||||||||
| Discord | macOS, Android, iOS, Windows, Linux | Proprietary | Free, Premium 'Nitro' Subscription for Additional Features. | RTP, UDP, WS, HTTPS | Opus | TLS | 5,000 soft limit[5] | IM, file sharing, in-game overlay | 02.01.2018; February 1, 2018; 19 months ago | ||||||||||||||||
| 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; 6 years ago)[±][6] | ||||||||||||||||
| Empathy | Linux | GPL | Free | SIP, XMPP (Jingle), ICE (STUN-TURN), Zeroconf | Unknown | No | Unknown | IM, multi-user A/V,[7] collaborative applications | 3.12.12[8](May 13, 2016; 3 years ago)[±] | ||||||||||||||||
| Eyeball Chat | Windows | Proprietary | Free | SIP, STUN, ICE, XMPP | Unknown | Yes | 5[9] | IM, Conferencing, Voice, Video and SIMPLE based presence | Windows 3.2; 2009; 10 years ago | ||||||||||||||||
| 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; 9 years ago | ||||||||||||||||
| Google+ Hangouts | Linux, Windows, macOS, 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; 6 years ago)[±][10] | ||||||||||||||||
| 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, embedable in Lotus Notes[11] | 8.5.2; May 8, 2011; 8 years ago | ||||||||||||||||
| iCall | Linux, macOS, 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 | ||||||||||||||||
| Jami by Savoir-faire Linux | Android, FreeBSD, iOS, iPhone, Linux, Microsoft Windows, OS X[12] | GPL3 | 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, Gnome-KDE client, address book, multiple accounts, unlimited call number, call transfer, call hold-unhold, call recording, multi-way conferencing |
| ||||||||||||||||
| Jitsi | Linux, macOS, Windows (all java supported). ExperimentalAndroid builds are also available.[17] | Apache | Free | SIP-SIMPLE, XMPP-JingleSTUNICE, 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 supported[19]), call recording, 64-bit | 2.10 (build.5550) (February 5, 2017; 2 years ago)[±] | ||||||||||||||||
| 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) | ||||||||||||||||
| Librestream Onsight Connect | Windows, Android, iOS | Proprietary | ? | SIP, RTP, STUN | G.711, H.264, MPEG, and others | TLS, SRTP | Unknown | Voice, video, conferencing, image sharing, incoming call/IM push notifications. | February 27, 2018; 18 months ago | ||||||||||||||||
| Linphone | Linux, Windows, macOS, 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) | 3.11.1; March 10, 2017; 2 years ago | ||||||||||||||||
| Messages | macOS | Proprietary | Free, only MacOS and iOS | H263, H264 | Unknown | Unknown | Integrated, PBX independent | 7.0; July 25, 2012; 7 years ago | |||||||||||||||||
| 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 | 3.19.15 May 2019; 4 months ago | ||||||||||||||||
| Mirial Softphone (Mirial s.u.r.l.) | Windows 2000-XP-2003-Vista-7 (including 64-bit versions), macOS (x86) | 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; 9 years ago, discontinued | ||||||||||||||||
| Mumble | Linux, macOS, iOS, Windows, Android | New BSD license | Free | ICE | 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 | 1.2.19; January 27, 2017; 2 years ago | ||||||||||||||||
| 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; 6 years ago | ||||||||||||||||
| oovoo | macOS, 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; 6 years ago | ||||||||||||||||
| 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 | 3.21 (18 January 2019; 7 months ago)[±][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 | 2.72 (23 May 2019; 3 months ago)[±][21] | ||||||||||||||||
| QuteCom | Linux, macOS, 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[22] | 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; 8 years ago[23])[±] | ||||||||||||||||
| Roger Wilco GameSpy | Windows | Proprietary | ? | Proprietary | ? | ? | ? | ? | 2001; 18 years ago | ||||||||||||||||
| Skype | Linux(with limited functionality),[24]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. |
| ||||||||||||||||
| TeamSpeak | Linux, Windows, macOS, FreeBSD, Android, iOS | Proprietary | Free | Unknown | CELT, Speex, Opus[29] | 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 | 3.3 | ||||||||||||||||
| TeamTalk | Linux, Windows, macOS, Android, iOS, Raspbian | Proprietary | Free | Proprietary | Opus, Speex, WebM | No | 1000 | Video, file sharing, desktop sharing, stream media files (MP3, AVI) | 5.3.3; November 2018; 10 months ago | ||||||||||||||||
| TeamViewer | Linux, Windows, macOS, iOS, Android[30] | Proprietary | Free (personal use only) | Unknown | Unknown | AES256 | Unknown | Unknown |
| ||||||||||||||||
| Telephone | macOS 10.10.2 | BSD | Free | SIP, STUN, ICE | Unknown | No | Unknown | Address Book integration | 1.1.4; March 6, 2012; 7 years ago | ||||||||||||||||
| Toktumi Unlimited, Line2 Pro | Windows XP-Vista-7, macOS, 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; 9 years ago; macOS; October 2010; 8 years ago | ||||||||||||||||
| Tox | Linux, macOS, Windows, Android, FreeBSD | GPL | Free | Tox, VP8 | Opus, | NaCl | Unknown | Voice, video, instant messaging, file transfers | Unknown | ||||||||||||||||
| Tru App | Windows 2000-XP-Vista-7, macOS, 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 | 1.10.2 (February 14, 2019; 6 months ago)[±] | ||||||||||||||||
| Ventrilo | macOS, Windows, iOS, Android | Proprietary | Free | Unknown | Unknown | No | 8 | Conferencing, chat, text-to-speech | 3.0.8 | ||||||||||||||||
| Viber | Linux,[b]macOS,[b]Windows,[b]Android, Bada, BlackBerry OS, iOS, Series 40, Symbian, Windows Phone | Proprietary | ? | Unknown | Unknown | Yes[41] | Unknown | Varies by platform: Text, picture and video messaging on all, voice calling only on iPhone, Android and Microsoft's Windows Phone |
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| Vonage | Linux, macOS, Windows, Android, iOS | Proprietary | not free | SIP, STUN, ICE, TURN | Audio: Opus, G.711 Video: VP8 | SRTP | 50 | VoIP , 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. | |||||||||||||||||
| Wire | Linux, Windows, macOS, iOS, Android, Web | GPLv3 | not free | ? | Template:Opus (audio), VP8 (video) | DTLS, SRTP[46] | 10[47] | 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-Lite | macOS, 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) | 5.3.3 July 10, 2018; 14 months ago | ||||||||||||||||
| Yahoo! Messenger | Classic Mac OS (8, 9), macOS, 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; 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 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; 2 years ago | |||||||||||||||||
| Zfone | Linux, macOS, Windows | 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) |
- ^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]
- ^ abcViber must be first installed on a mobile phone to function on a desktop operating system[39][40]
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) | ||||||
| CounterPath Corporation Bria | Android v4.4+, iOS v10+ | Proprietary | No | SIP | G.722 wideband, G.711a, G.711u, iLBC, G.729a, SILK, GSM, VP8, H.264, Opus | TLS, SRTP, ZRTP | Voice 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; 13 months ago | ||||||
| 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 | ||||||
| Google Duo | iOS, Android | Proprietary, freeware | No | WebRTC | ? | ? | One-to-one voice and video calling. |
| ||||||
| iCall Mobile | iOS v4.3+ | Proprietary, freeware | No | SIPAIMICQXMPP, Facebook, Yahoo! Messenger, Windows Live | Speex, CELT, WebM | TLS, ZRTP | VoIP over Wi-Fi or 3G, SMS, voicemail | 2.0.1; April 2012; 7 years ago | ||||||
| Jajah Mobile Web | Symbian, Windows Mobile (version unknown) | Proprietary | No | ? | ? | ? | web based service, Call back,no download[50] | ? | ||||||
| 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; 5 years ago; 3.0 (Android); July 9, 2014; 5 years ago | ||||||
| Line | Android, iOS | Proprietary | No | ? | ? | ? | ? | |||||||
| 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 Signal Messenger | iOS, Android | GPLv3 | Yes | WebRTC[51] | Opus[51] | TLS, Signal Protocol[51] | End-to-end encryption by default for everything. CallKit and location privacy,[52] one-to-one and group messaging, video calling,[52] image/video sharing, timed messages, identity verification, screenshot blocking. Android only: SMS/MMS messaging, doodling,[53] GIF sharing.[54] |
| ||||||
| Sipdroid | Android | GPL | Yes | SIP | ? | ? | Uses Wi-Fi, 3G or EDGE | 2.7 | ||||||
| Tango by TangoME Inc. | iOS, Android, Microsoft Windows, macOS, 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 | ||||||
Android, BlackBerry, iOS, Symbian, Windows Phone | Proprietary, freeware | No | ? | ? | ECDH, SRTP[58] | VoIP and instant messaging over Wi-Fi or a data connection. |
| |||||||
| Windows Mobile 6 | Windows Mobile 6 Professional/Standard | Proprietary | No | SIP to publicly and non-publicly routable servers | ? | ? | 6.1 | |||||||
| X-PRO for Pocket PC | Windows Mobile 2003 (earlier versions support Windows PocketPC 2002) | Proprietary, discontinued in April 2007[61] | 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.[62] | 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; 4 years ago[63])[±] Android 2.0.2 (February 12, 2014; 5 years ago)[±] |
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) | No | 0.3.9; June 12, 2006; 13 years ago | ||
| 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; 5 years ago |
| 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; 4 years ago |
| 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; 5 years ago |
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, Linux | Proprietary | SIP | TLS, SRTP | Voice and video IP telephony and conferencing, voice mail and instant messaging | < 50,000 users | 16.2 ; July 5, 2019; 2 months ago |
| 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; 11 years ago |
| 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; 6 years ago |
| Asterisk PBX | Linux, BSD, macOS, Solaris | GPL, optional: Proprietary[65] | 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) | 16.5.0 (25 July 2019; 49 days ago[66])[±] 15.7.3 (11 July 2019; 2 months ago[67])[±]13.28.0 (25 July 2019; 49 days ago[68])[±] |
| Brekeke SIP Server | Linux, Windows | Proprietary | SIP | TLS, SRTP | SIP Registrar, SIP Proxy | SIP Service Providers, VoIP service providers, Healthcare, Security | 3.9.1.3; December 21, 2018; 8 months ago |
| 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 | 3.9.1.4; December 27, 2018; 8 months ago |
| 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; 3 years ago |
| CommuniGate Pro | Linux, BSD, macOS, 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; 3 years ago |
| 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; 5 years ago |
| 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; 5 years ago |
| 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; 3 years ago |
| 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 | 1.8.7 (July 2, 2019; 2 months ago)[±] |
| FreePBX | Linux, BSD, Solaris | GPL | SIP, IAX, H323, 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; 2 years ago |
| 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; 5 years ago |
| 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; 5 years ago |
| 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, complementary desktop Softphone app | SME | 2.5.2; November 15, 2016; 2 years ago |
| MediaCore SBC | Linux | Proprietary | H.323, SIP, SMPP | SSL, TLS, HTTPS | Dynamic 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 support | Transit VoIP services providers, VoIP wholesale carriers, VoIP termination providers, SMS carriers | 4.6.1; May 2017; 2 years ago |
| 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; 2 years ago |
| 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; 12 years ago |
| 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; 10 years ago |
| 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; 6 years ago)[±] |
| Pbxnsip | Linux, BSD, macOS, 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; 10 years ago |
| 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; 5 years ago |
| 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; 8 years ago |
| 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, MAPCAMEL | 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; 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 name | Development status | Open source client | End-to-end authentication[a] | Encryption protocols | Forward secrecy | Multiple encryption | Encrypted group calling | Proxy, Tor | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
| ZRTP | ECDH | DTLS | SRTP | ||||||||
| FaceTime | Active | No[69] | No[69] | ? | ? | ? | ? | Yes[69] | ? | No | No |
| Google Duo | Active | No | No | ? | ? | ? | ? | ? | ? | No | No |
| Jitsi[b] | Active | Yes | Yes[69] | Yes | No | Yes | Yes | Yes[69] | Yes | Yes | ? |
| Line[70][71] | Active | No | ? | ? | ? | ? | ? | ? | ? | No[70] | No |
| Linphone[b] | Active | Yes | Yes | Yes | ? | Yes | Yes | Yes | Yes | ? | No |
| PGPfone | Abandonware | Viewable source[72] | Yes | ? | ? | ? | ? | ? | ? | ? | ? |
| Signal | Active | Yes | Yes[69] | No | Yes | No | Yes | Yes[69] | Yes | No | Depends[73] |
| Silent Phone | Active | Viewable source[74] | Yes[69] | Yes | ? | ? | Yes | Yes[69] | Yes | Yes | No |
| Telegram | Active | Yes | Yes[75] | No | No | No | No | Yes | ? | No | No |
| Threema | Active | Partially[c][76] | Yes[77] | No | Yes[77] | Yes[77] | Yes[77] | Partially[d][77] | Yes | No | No |
| Viber[41] | Active | No | ? | ? | ? | ? | ? | ? | ? | ? | No |
| Active | Partially[c][78] | Yes[78] | No | Yes[78] | No | Yes[78] | Yes[78] | Yes[78] | No | No | |
| Wire | Active | Yes | Yes[79] | No | ? | Yes[46] | Yes[46] | ? | Yes | Yes | No |
| Zfone | Abandonware | Viewable source[80] | Yes | Yes | Optional[81] | ? | Yes[82] | Yes | Yes | ? | ? |
VoIP software with client-to-server encryption[edit]
The following table is an overview of those VoIP clients which provide client-to-server encryption.
| Client name | Encryption protocols |
|---|---|
| Google Hangouts[69] | SRTP[83] |
| Skype[69] | A custom protocol |
- Notes
- ^End-to-end authentication protects communications from man-in-the-middle attacks by the service provider.
- ^ abOnly if the user has registered with a compatible SIP provider. Some SIP providers do not support certain encryption protocols.
- ^ abOnly the encryption related source code is open.
- ^Only on the network connection, not on the end-to-end layer.
See also[edit]
References[edit]
- ^ ab'Skype Connect...'skype.com. Microsoft Corporation Inc. Archived from the original on 2014-11-11. Retrieved 15 November 2014.
- ^'Download Blink'. Blink Project's Website. Retrieved 22 June 2016.
- ^'Release Notes for Cisco IP Communicator 8.6.6'. Cisco. Retrieved 2018-04-03.
- ^'Cisco IP Communicator 8.6'. Cisco. Retrieved 2018-04-03.
- ^'Discord on Twitter'. Twitter. Retrieved 2016-12-29.
- ^'Ekiga 4.0.1 [STABLE] available'. www.ekiga.org. 21 February 2013. Retrieved 2014-05-09.
- ^'Telepathy Q&A from the Boston GNOME Summit'. Retrieved 4 February 2014.
- ^'ANNOUNCE: Empathy 3.12.12'. 13 May 2016. Retrieved 17 August 2016.
- ^Eyeball Chat 3.2 FeaturesArchived 2009-03-21 at the Wayback Machine. EyeballlChat.com.
- ^'Chrome Web Store Hangouts'. Retrieved July 11, 2013.
- ^'Telephony with Lotus Sametime software'. IBM.com. Retrieved 2010-02-16
- ^'News'. Ring. 2018-07-25. Retrieved 2018-12-01.
- ^'Jami'. App Store. Retrieved 2019-08-29.
- ^'Jami - Apps on Google Play'. play.google.com. Retrieved 2019-08-30.
- ^'Index of /windows'. dl.ring.cx. Retrieved 2019-08-27.
- ^'Jami'. Mac App Store. Retrieved 2019-08-28.
- ^'Jitsi (SIP Communicator) Android — Nightly Builds Index'. Jitsi.org. Retrieved 2014-11-15.
- ^Interview with Emil Ivov, Deploy360 blog
- ^'[#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.
- ^Release history on Phoner download page
- ^Changelog on PhonerLite download page
- ^'Supported Codecs'. qutecom.org. Retrieved 19 December 2014.
- ^'Announcement: QuteCom 2.2.1'. Archived from the original on 2 April 2013.CS1 maint: unfit url (link)
- ^http://opensourceforu.com/2017/06/microsoft-retire-skype-linux-app-july-1/
- ^ abcd'Release Notes for Skype for Windows, Mac and Linux'. Skype Support.
- ^'Release Notes for Skype on Mobile'. Skype Support.
- ^'Skype for iPhone'. App Store. Retrieved 2019-08-20.
- ^'Skype for iPad'. App Store. Retrieved 2019-08-20.
- ^'New TeamSpeak3 Client and Server released today'. TeamSpeak Systems GmbH. Retrieved 2015-08-04.
- ^'TeamViewer overview'. GetApp.
- ^'TeamViewer'. TeamViewer. 29 August 2019.
- ^'TeamViewer for Mac'. TeamViewer. 3 September 2019.
- ^'TeamViewer'. TeamViewer. 3 September 2019.
- ^'TeamViewer'. GooglePlay. Google. Retrieved 20 August 2019.
- ^'TeamViewer: Remote Control'. App Store. Apple. Retrieved 20 August 2019.
- ^'TeamViewer: Remote Control'. Windows Store. Microsoft. Retrieved 20 March 2019.
- ^'TeamViewer: Remote Control'. BlackBerry World. BlackBerry Limited. Retrieved 18 December 2017.
- ^'TeamViewer'. Chrome Web Store. Google. Retrieved 15 November 2018.
- ^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.
- ^Viber Unveils Desktop App
- ^ 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.
- ^'Viber Messenger - Messages, Group Chats & Calls - Apps on Google Play'. play.google.com. Retrieved 2019-09-04.
- ^'Viber Messenger - Messages, Group Chats & Calls APKs'. APKMirror. Retrieved 2019-09-04.
- ^'Viber Messenger: Chats & Calls'. App Store. Retrieved 2019-09-01.
- ^'Viber Support portal'. Viber Support. Retrieved 2019-08-29.
- ^ abc'Wire Security Whitepaper'. Wire Swiss GmbH. Retrieved 13 April 2016.
- ^'Wire on Twitter'. Twitter. Retrieved 2017-02-28.
- ^'Google Duo'. APKMirror. Android Police. March 11, 2018. Retrieved March 11, 2018.Italic or bold markup not allowed in:
publisher=(help) - ^'Google Duo - Video Calling'. App Store. Apple Inc. March 11, 2018. Retrieved March 11, 2018.
- ^'JAJAH.Mobile Web'Archived 2009-06-29 at the Wayback Machine. Jajah.com.
- ^ abcMarlinspike, Moxie (14 February 2017). 'Video calls for Signal now in public beta'. Open Whisper Systems. Retrieved 22 March 2017.
- ^ abMarlinspike, Moxie (13 March 2017). 'Video calls for Signal out of beta'. Open Whisper Systems. Retrieved 22 March 2017.
- ^Marlinspike, Moxie (21 December 2016). 'Doodles, stickers, and censorship circumvention for Signal Android'. Open Whisper Systems. Retrieved 22 March 2017.
- ^Marlinspike, Moxie (1 November 2016). 'Signal and GIPHY'. Open Whisper Systems. Retrieved 22 March 2017.
- ^Signal Foundation (2019-08-30). 'Signal Private Messenger'. Google Play Store. Retrieved 2019-08-30.
- ^Quiet Riddle Ventures LLC (2019-09-05). 'Signal - Private Messenger'. Apple App Store. Retrieved 2019-09-05.
- ^Open Whisper Systems (2019-09-05). 'Releases - signalapp/Signal-Desktop'. GitHub. Retrieved 2019-09-05.
- ^'WhatsApp Encryption Overview – Technical white paper'(PDF). WhatsApp Inc. 4 April 2016. Retrieved 9 April 2016.
- ^'WhatsApp Messenger'. App Store. Retrieved 2019-09-02.
- ^'WhatsApp Messenger APKs'. APKMirror. Retrieved 2019-09-05.
- ^'Pocket PC SIP Softphone'. Counterpath.com.
- ^'Recommended Pocket PCs'. Counterpath.com.
- ^http://www.mod-gadget.com/upptalk-app-updated-ipad/
- ^'yuilop - Free texts and SMS'. Amazon. Retrieved 10 March 2014.
- ^'Asterisk Commercial Licensing'. Digium. Retrieved 12 October 2013
- ^'ChangeLog-16-current'. Retrieved 16 August 2019.
- ^'ChangeLog-15-current'. Retrieved 16 August 2019.
- ^'ChangeLog-13-current'. Retrieved 16 August 2019.
- ^ abcdefghijk'Secure Messaging Scorecard. Which apps and tools actually keep your messages safe?'. Electronic Frontier Foundation. 4 November 2014. Retrieved 11 July 2016.
- ^ ab''Letter Sealing' End-to-End Encryption Indicator Icon Introduced to LINE Messaging App'. Line Corporation. 10 August 2016. Retrieved 29 September 2016.
- ^Shin, Ki Bin (11 August 2016). 'The next step for even safer messaging: Letter Sealing'. Line Corporation. Retrieved 30 September 2016.
- ^'PGPfone'. pgpi.org. n.d. Archived from the original on 9 November 2000. Retrieved 26 August 2016.Cite uses deprecated parameter
dead-url=(help) - ^Marlinspike, Moxie (13 March 2017). 'Video calls for Signal out of beta'. Open Whisper Systems. Retrieved 30 March 2017.
- ^'Is Silent Phone open source?'. silentcircle.com. Silent Circle. n.d. Retrieved 26 August 2016.
- ^'Voice Calls: Secure, Crystal-Clear, AI-Powered'. Telegram. 30 March 2017. Retrieved 30 March 2017.
- ^'Where can I find Threema's source code?'. threema.ch. Threema. n.d. Retrieved 30 October 2017.
- ^ abcde'Threema cryptography whitepaper'(PDF). threema.ch. Threema. n.d. Retrieved 30 October 2017.
- ^ abcdef'WhatsApp Encryption Overview – Technical white paper'(PDF). WhatsApp Inc. 4 April 2016. Retrieved 5 April 2016.
- ^'A major upgrade to calling'. Medium. Wire Swiss GmbH. 14 March 2017. Retrieved 14 March 2017.
- ^'Is Zfone open source?'. zfoneproject.com. Zfone. 2006. Retrieved 26 August 2016.
- ^'Do you support Elliptic Curve Diffie-Hellman?'. zfoneproject.com. Zfone. 2006. Retrieved 26 August 2016.
- ^'Why do we need ZRTP if we already have SRTP? Isn't SRTP good enough?'. zfoneproject.com. Zfone. 2006. Retrieved 26 August 2016.
- ^https://support.google.com/hangouts/answer/6046115
Building Telephony Systems With Opensips Pdf Creator Software
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