Comparison of VoIP software

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Voice over IP (VoIP) software is used to conduct telephone-like voice conversations across IP based networks. For residential markets, VOIP phone service is often cheaper than traditional PSTN phone service and can remove geographic restrictions to telephone numbers (i.e. have a "New York" PSTN phone number in Tokyo).

For enterprise or business markets, VoIP enables the enterprise to manage a single network (the IP network) instead of separate voice and data networks, while enabling advanced and flexible capabilities to the end user.

Contents

[edit] General softphone clients

Program Operating systems License Protocols/based upon/compatible with Encryption Other capabilities Latest release
Abbeyphone Windows XP/2000 Closed Proprietary SIP      
AGEphone Windows XP/2000/Vista, Windows Mobile Trialware version / Closed Proprietary SIP, SDP, RTP, STUN, UPnP Recording, Voice Mail, Multiple Services at Once, Outlook Support, Call Forwarding 1.67 Windows, 1.71 Mobile
AOL Instant Messenger MS Windows, Mac OS, Linux Freeware SIP, RTP Video, file transfer, PC to phone, phone to PC
BitWise IM Linux, Mac OS X, Windows Freeware / Closed Proprietary Blowfish File transfer, whiteboard 1.7.2
Brosix Windows Freeware / Closed Proprietary AES Text chat, Video, File transfer, Whiteboard, Co-Browse, Voice mail, Voice conference 1.9.2
Cisco IP Communicator Windows Closed Proprietary SCCP (Skinny), SIP, TFTP 2.1.2 (September 17, 2007)
Coccinella FreeBSD, Linux, Mac OS X, Windows GPL Free software XMPP, IAX Supports TLS/SSL and SASL File transfer, whiteboard 0.96.8  (April 30, 2008)
Comneon Windows 2000/XP/Vista, Windows Mobile, Linux, Brew, APOXI Closed Proprietary SIP, SDP, RTP, STUN, MSRP, XCAP HTTP Digest, IMS AKA
  • IMS/IETF SIP dual mode
  • Video, VoIP, PoC, IM, Chat, Presence, File Sharing
  • H.263, H.264
  • G.711, AMR
 3.5
Cornfed SIP User Agent Linux Freeware / Closed Proprietary SIP, SDP, RTP, STUN Command-Line Interface (CLI) and Gnome GUI clients 1.0.1
CounterPath Bria Windows & Mac Closed Proprietary SIP, STUN, ICE SRTP, TLS Contact centric interface, Customizable Skinning engine, eyeBeam Feature set 2.1
CounterPath eyeBeam Windows, Mac, Linux Closed Proprietary SIP, STUN, ICE SRTP, TLS Video, IM, Conferencing, Multiple login account, QoS, Outlook integration, Call transfer, 6 lines 1.5
CounterPath X-Lite Windows, Mac, Linux Freeware SIP, STUN, ICE IM, single login account, for Windows and Mac also Conferencing, Video and SIMPLE based presence] Windows and Mac: 3.0, Linux: 2.0
damaka Windows Freeware SIP Always end-to-end encrypted using unspecified algorithm. CallOuts, video, desktop sharing, voice commands, file-sharing, SMS, IP Radio, RSS reader 2.5 (December 26, 2006)
ComunIP ClicVoz Windows, Linux Closed Proprietary SIP, SDP, ICE (draft-17), STUN, proprietary HTTPS Tunneling Protocol, RTP, TFTP TLS/SSL 2.5.0 (July 31, 2007)
Program Operating systems Licence Protocols/based upon/compatible with Encryption Other capabilities Latest release
Ekiga (formerly GnomeMeeting) Linux, Windows GPL Free software SIP, H.323, STUN, Zeroconf Video, IM 2.0.11. (September 27, 2007)
Express Talk Windows, Mac OS X, Windows CE Freeware version, Licensed version. SIP 6 Lines, multiple accounts, conferencing, transfers, recording, push-to-talk (intercom) 2.04
Eyeball Chat Windows Freeware Free VoIP, video and IM 2.2
FaramPhone Windows XP/Vista/2000/2003 Closed Proprietary SIP, SDP, RTP
  • G.711,AMR,Speex,GSM
  • H.263, MPEG4
  • Audio and Video Call, DTMF, 2 Lines
  • Audio and video Conference (5 parties)
  • Video Mail,Call Forwarding, Call Transfer
  • Video Recording to 3gp file, Call History,Friends List
 1.1.0 (May,17,2008)
Gizmo5 Desktop (formerly known as Gizmo Project) Linux, Mac OS X, Windows XP/2000 Freeware SIP, XMPP, Jabber SRTP Recording, voicemail, Jabber IM, Gizmo to phone, phone to Gizmo, Talk with Yahoo! Messenger, Google Talk, or Windows Live user 4.0.0.369 2008 May 21 -Windows

3.1.2 (v222) 2007 Oct 31 -MacOS (As of May '08)
Globe7 Linux, Mac OS X, Windows XP/2000 Freeware SIP SRTP Call landline, mobile, VOD, SMS, Free US DID number. 7.2.0.0 April 12, 2007
Google Talk Windows XP/2000 Freeware (libjingle is Free software XMPP, Jabber Chat, file transfer, voicemail, mail via "GMail Integration" 1.0.0.104
GoSIP Linux, Mac OS X, Windows XP/2000,Windows Mobile Freeware SIP January, 2007
iCall Windows Vista/XP/2000 Closed Proprietary SIP Voicemail 2.0.0.58
iChat AV Mac Closed Proprietary SIP AIM ICQ Jabber H263 H264 Integrated, PBX independent January 2007
iSoftPhone Mac OS X Shareware SIP, STUN, RTP Address Book Integration, Daylite CRM Integration, Call Recording, IM, Conferencing, Mulitple Providers, Simple Setup, Call transfer, 5 lines 2.0 - released Jan 2008
TABLETmedia iFon Windows Mobile 2003/2003SE/5.0, WindowsCE 4.x/5.x Commercial SIP, H.261, H.263, G.711, G.722, G.723.1, G.729A, GSM, AMR Optional: MD5/Digest, DES, AES Mobile VoIP, videoconferencing, messaging, dual-mode devices support 5.10.59
iVisit Windows & Mac Freeware / Closed Proprietary Proprietary P2P protocol 8-way videoconferencing, file sharing, recording in QuickTime format 3.6.3 (verified on July 7th, 2006)
Intellivic Softphone Windows 2000/XP/Vista Closed Proprietary/ Freeware SIP, SDP, RTP, UPnP, NAT-PMP, STUN, TURN TLS, HTTPS
  • inherits all features of Intellivic SDK
  • features and skin fully customizable
 4.1
Jabbin Linux, Windows GPL Free software Libjingle, XMPP, Jabber SSL Instant messaging, file transfer, compatible with Google Talk 2.0b2
KCall Linux (KDE) GPL / LGPL Free software SIP 0.7.0 (2nd August 2005)
Program Operating systems Licence Protocols/based upon/compatible with Encryption Other capabilities Latest release
KPhone Linux (KDE) GPL Free software SIP, STUN, NAPTR/SRV SRTP Video, voice, IM, external Sessions, IPv6 support for UDP 1.0.2 (22nd September 2006)
Linphone Linux and Microsoft Windows GPL Free software SIP Video, IM, STUN, IPv6 1.7.1 (16 April 2007)
Lotus Sametime Linux and Microsoft Windows, Mac OS X Closed Proprietary SIP, SIMPLE, T.120 and H.323 7.5.1 (April 2007)
Lynxphone Windows, Mac OS X, Linux, NetBSD, FreeBSD Freeware SIP, STUN, ICE SRTP, TLS Voice only, multiple-language support, Windows Address Book integration, skins, custom ringtones 0.6.0
MindSpring (formerly Vling) Windows 2000, Windows XP Freeware SIP, XMPP Instant messaging, PC to phone, file transfer 2.0
Minisip Windows XP, 2000, Linux, Windows Mobile GPL / LGPL Free software SIP SRTP, TLS, MIKEY (DH, PSK, PKE), end to end encryption Video, IM Conferencing
Minipax Windows Vista, XP, 2000 Freeware SIP Voip Tunnelling or VPN Supports G723.1,GSM,G711, G729 Available on separate download,Call recording, Acoustic Echo Canceller 2.7.4.1
Mirial Softphone (Mirial, formerly DyLogic) Windows 2000/XP/2003/Vista Closed Proprietary SIP, H.323, RTSP
  • H.264 HD 720p 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 camera input
  • Presentation (H.239, RFC-4796)
  • Acoustic Echo Canceller
  • Audio denoise filter
  • Far End Camera Control
  • GPU accel (D3D and OpenGL)
 6.0 (February 20, 2008)
Mizuphone Windows 2000/XP/2003/Vista Freeware Closed Proprietary SIP, SDP, RTP, STUN, ICE, UPnP, TLS, Tunneling Protocol, G.711, G.723.1, G.729A, iLBC, MPEG4, MJPG, H264, SIMPLE SSL/TLS, SRTP
  • Multiple accounts, multiple SIP server registrations
  • HD quality video
  • File transfer,File-Sharing and Remote Desktop (compatibile with every SIP server)
  • IM (chat),Presence
  • Mute, Hold, Redial, Transfer, Forward, Conference
  • DTMF (inband DTMF or SIP INFO messages)
  • AEC, AGC, VAD, Auto QoS, Dynamic Jitter
  • UPNP, STUN, ICE, firewall and NAT traversal
  • Codecs: G711 (PCMU,PCMA), G.723.1, G729, iLBC, MPEG1, MPEG4, Theora, H263,H264, MJPG
  • Balance/credit display
  • Microsoft Outlook synchronization
  • History (with voice recording)
  • Fully encypted communications (signaling and media too)
  • Costumizable (skin,features,language)
 0.8.2 (May 22, 2008)
Movial Communicator Windows 2000/XP/Vista Closed Proprietary SIP, RTP, STUN, XCAP
  • IMS and IETF compatible
  • IM, Chat, Presence, VoIP, Video, File transfer
  • H.263, H.264 HD video
  • G.723, G.729, AMR, ISAC, iLBC audio
  • Outlook connector
  • Customizable GUI
ooVoo Windows / Mac OS X Shareware Proprietary codec based on On2 TrueMotion VP7, Polycom Siren 14 Up to six person multiparty video calls, video messages, instant text messaging, file transfer 1.1
PeerMe Windows 2000 or Windows XP Freeware  ?
PhoneGaim Linux (Linspire), Windows XP/2000 GPL free software SIP
Phoner and PhonerLite Windows Freeware SIP, CAPI TSL, SRTP recording, voicemail Phoner: 2.17 (May 22nd, 2008), PhonerLite: 1.44 (May 22nd, 2008)
Program Operating systems Licence Protocols/based upon/compatible with Encryption Other capabilities Latest release
PJSIP Linux, Win32 (NT/200/XP), WinCE/Windows Mobile, Mac OS X, FreeBSD, RTEMS, Symbian, etc GPL free software/Closed Proprietary SIP, SIMPLE, SDP, RTP, RTCP, STUN, TURN, ICE TLS, SRTP Media stack, NAT traversal (STUN/TURN/ICE), Python API 0.8.0 (11 Nov 2007)
Remote Origin, Inc. Windows Closed Proprietary IAX2 Digest-Authentication TTY, USB Token DRM 1.0 (March 1st, 2007)
SightSpeed Mac OS X / Windows Freeware SIP,RTP,Proprietary P2P protocol video, voicemail, phone in, phone out, multiparty calling, conference recording, text messaging, NAT traversal, video mail 6.0
SIP Communicator Linux, Mac, Windows XP/2000 (all java supported) LGPL free software SIP/SIMPLE, Jabber Text messaging
Sippax Windowx Vista,XP,2000 Closed Proprietary SIP Voip Tunelling (VPN)
  • Support Audio and Video
  • Address book
  • Call Log
  • Skin customization
  • private branding/logo
SJphone Windows 2000/Windows XP, Windows Vista, Mac OS X, Linux, Windows Mobile 5 Freeware SIP, RTP, STUN, Jabber, H.323 Customisation for ITSP Windows XP/Vista: 1.65 beta (Mar 27.2007)
Skype Windows 2000/XP, Mac OS X, Linux(32-bit i386 only), Windows Mobile Freeware Proprietary P2P protocol Encrypted Video, file transfer, voicemail, Skype to phone, phone to Skype, additional P2P extensions (games, whiteboard, etc...) Windows: 3.8.0.115, (as of Apr. 29, 2008), Linux: 2.0.0.68, Mac OS X: 2.7.0.257 (as of Feb. 13, 2008), Windows Mobile: 2.2.0.37 (as of Nov. 7, 2007)
SmeetX, Smeet SDK Linux, Microsoft Windows Closed Proprietary SIP, H.323, STUN, proprietary P2P protocol Optional encryption plugin Video (H.263, H.263+, MPEG-4 and H.264), ActiveX control, XML, SOAP 1.3.3 (as of April 2007)
Switchboard, The Windows 2000/XP, Mac OS X, Linux, OS/2, and any other Java enabled platform Freeware Proprietary P2P protocol Encrypted web-based (no installation), conferencing, file transfer, ICQ, AIM, and MSN compatibility 3.2 (March 2007)
Program Operating systems Licence Protocols/based upon/compatible with Encryption Other capabilities Latest release
Tivi Windows, many cell phones, Nokia smartphones Freeware tivi-to-land line Video call: 0.127a, Lite: 0.602.
Twinkle Linux GPL free software SIP SRTP, ZRTP 1.1 (July 21, 2007)
Vbuzzer Windows XP Closed / Proprietary freeware SIP TLS IM (MSN), voicemail, personalized voice greeting. 2.0.282
VoipDiscount Windows 2000/XP/Vista Freeware SIP
VOIspeed Windows 2000/XP Freeware SIP IPBX, IVR, CRM integration, LCR, Voicemail 4
vPhone Windows Freeware + proprietary SIP, GSM, VOIP Conferencing, address book, SMS, chat
VoipGATE Softphone Windows 2000/XP/Vista freeware IAX2 protocol address book, SMS, chat v2.08 (Dec 2007)
WengoPhone Linux, Mac OS X, Windows XP/2000, SmartPhone, Windows Mobile GPL free software SIP AES-128| Video, IM (MSN, AIM, ICQ, Yahoo!, Jabber, GoogleTalk), voicemail, wengo to phone. v2.1.0 (May 15, 2007)
Program Operating systems Licence Protocols/based upon/compatible with Encryption Other capabilities Latest release
Windows Live Messenger Windows 2000/XP Freeware SIP, RTP, proprietary Video, voice, chat, text messaging, PC to Phone
wxCommunicator Windows XP/2000 GPL free software SIP, STUN, TURN, ICE, Voice, chat, recording, conferencing, multiple sip profiles
Yahoo! Messenger Microsoft Windows, Mac OS (8, 9, X), (Linux/FreeBSD version not VoIP capable) Freeware SIP (using TLS) and RTP (media) Video, file transfer, PC to phone, phone to PC
YakaPhone Microsoft Windows, Mac OS (8, 9, X), (Linux/FreeBSD) Freeware IAX, IAX2 Audio, Video, Text & SMS, PC to phone, phone to PC
XMeeting Mac OS X BSD free software SIP, H323, STUN Video, call recording v0.3.4a
Zfone (formerly PGPfone) Linux, Mac OS X, Windows Viewable source / Proprietary license (includes time bomb provision) SIP and RTP SRTP, ZRTP Beta (6th of December 2006)
Zoiper (formerly Idefisk) Linux, Mac OS X, Windows 2000, Windows XP, Windows Vista Freeware / Proprietary SIP, RTP, STUN, T.38, IAX, IAX2 TLS, SRTP
  • T.38 Fax
  • Native conferencing
  • API Outlook integration
  • Attended transfer
  • Automatic provisioning(XML)
  • Changeable number of lines
  • Call recording
  • URL handling
  • Outlook/Thunderbird integration
  • Echo cancellation
  • Multilanguage support
 Zoiper 2.12 - 9th of January, 2008
Program Operating systems Licence Protocols/based upon/compatible with Encryption Other capabilities Latest release

[edit] Hosted services

Program Licence Protocols/based upon/compatible with Encryption Other capabilities Latest release
EasyIVR Closed Proprietary Proprietary Protocol Virtual ACD, IVR, Voice Broadcasting, Development environment, 12
HarmonicaPhones Closed Proprietary Proprietary Protocol VirtualPBX, Conferencing, ACD, Development environment, Flash UI 2.3
Vidivic Closed Proprietary SIP, SDP, RTP, UPnP, NAT-PMP, STUN, TURN TLS, HTTPS
  • Intellivic SDK feature set
  • Conferencing solution
  • Ad-hoc and scheduled conferences
  • PSTN dial-in
 1.0
Jajah Closed source Connects together two conventional phones.
Loquaxity Closed source IAX2 SIP Transport Layer Security Click-to-Call, ACD, Co-browse

[edit] PDA specific

Program Operating systems Licence Protocols/based upon/compatible with Encryption Other capabilities Latest release
HipVoice WinCE 4.2, PocketPC, Windows Mobile 5.0, CE 5.0 Proprietary XMPP, Jabber Proprietary algorithm Unicast & Multicast Push-To-Talk 3.1
Express Talk Windows Pocket PC or Windows Mobile OS (all versions since 2002) Closed / Proprietary SIP,G.711, GSM 2 Lines, On Hold, Push-to-Talk v2.07
TABLETmedia iFon Windows Mobile 2003/2003SE/5.0, WindowsCE 4.x/5.x Commercial SIP, H.261, H.263, G.711, G.722, G.723.1, G.729A, GSM, AMR Optional: MD5/Digest, DES, AES Mobile VoIP, videoconferencing, messaging, dual-mode devices support 5.10.59
Intellivic Smartphone Windows Mobile5/Mobile6 Closed Proprietary SIP, SDP, RTP, UPnP, NAT-PMP, STUN, TURN TLS, HTTPS, VPN
  • Intellivic SDK feature set
  • IMR/VCC
 1.2

[edit] Mobile phones

Program Operating systems Licence Protocols/based upon/compatible with Encryption Other capabilities Latest release
Eyeball Mobile Messenger Windows Mobile 5 or 2003, Linux, uclinux Proprietary software XMPP, SIP, STUN, TURN, ICE HTTPS VoIP, Presence, Messaging & Video Telephony v.7.1
iSkoot Windows Mobile 5 or 6, BlackBerry, UIQ, Symbian 9, J2ME, Palm OS 5 Freeware Skype HTTPS Presence, Messaging, Authorization v1.1
fring Symbian 8 or 9, Windows Mobile 5 or 6, iPhone proprietary SIP, Skype, Google Talk, MSN Messenger, Twitter, ICQ, AIM, Yahoo
Gizmo5 Mobile Java (J2ME?), Nokia Proprietary freeware SIP?, Recording?, voicemail?, Jabber IM, Gizmo ↔ phone, Yahoo! Messenger, or Windows Live user  ? 1.15 (as of May '08)
TABLETmedia iTalkie Windows 2000/XP, Windows Mobile 2003/2003SE/5.0, WindowsCE 4.x/5.x Commercial Optional: MD5/Digest, DES, AES serverless Push-to-Talk with presence and direct calling (VoIP) 1.46
Intellivic Smartphone Windows Mobile5/Mobile6 Closed Proprietary SIP, SDP, RTP, UPnP, NAT-PMP, STUN, TURN TLS, HTTPS, VPN
  • Intellivic SDK feature set
  • IMR/VCC
 1.2
Windows Mobile 6 Windows Mobile 6 Professional/Standard Freeware SIP

[edit] Frameworks and libraries

Program Operating systems Licence Protocols/based upon/compatible with Encryption Other capabilities Key and target markets Latest release
Tapioca Linux GPL free software Telepathy (software) 0.3.9 (June 12, 2006)
SDTU Linux (must support tcp_nodelay for full capablities) GPL free software SDTU , gsm over tcp Ability to send parallel stream (i.e. for videoconferencing) 0.1.7 (26-Jan-2003 13:27)
ComunIP VoxBR Windows, Linux Closed Proprietary SIP, SDP, ICE (draft-17), STUN, proprietary HTTPS Tunneling Protocol, RTP, TFTP SSL/TLS Fast-CGI integration (PHP backend), IRC protocol support Client and server-side applications, Software SBCs, VoIP Middleware (including support of SaaS delivery model) 2.5.0 (July 31, 2007)
Intellivic SDK Windows 2000/XP/Vista/EmbeddedXP/ WinCE/Mobile5/Mobile6 Closed Proprietary SIP, SDP, RTP, UPnP, NAT-PMP, STUN, TURN TLS, HTTPS
  • Standards: IMS, TISPAN, ETSI, 3GPP
  • Filetransfer, IM, presence
  • Contact management
  • USB phone support
 Client Applications 3.1
PCBest Network SIP SDK Windows 2000/XP/Vista/ Closed Proprietary SIP, SDP, RTP, STUN, TURN TLS Client and Server Applications 1.60
Brekeke JTAPI SDK Windows 2000/XP/Vista Closed Proprietary SIP, SDP, RTP, UPnP
  • Conference Calls
  • Transfer Calls
  • Recognize and Send DTMF
 Server Applications, IVR 1.0
Brekeke PAL Windows 2000/XP/Vista Closed Proprietary SIP
  • Park/Unpark Calls
  • Third Party Call Control
  • Transfer Calls
 Operator Consoles 1.0
reSIProcate Linux, Mac OS X, BSD, Windows Vovida Software License (BSD-like open source) SIP, SDP, STUN, TURN TLS, DTLS, S/MIME, Identity, Digest-Authentication SIP Stack, Dialog layer (DUM), Proxy (repro), TURN server (reTurn) Client and Server implementations (session signaling, registration, presence, messaging), proxies 1.3.1 (April 22nd, 2008)

[edit] Server software

Program Operating systems Licence Protocols/based upon/compatible with Encryption Other capabilities Key and target markets Latest release
3CX phone system Windows XP, 2000, 2003. Freeware / Closed Proprietary SIP IP PBX, Provisioning, Fax, Bridges, SIP trunking support, Unified Messaging, Outlook and Exchange 2007 integration, Call Queuing, Auto Attendant, VOIP Client SMB 5.0 (Dec 07)
4PSA VoipNow Linux (i386, x86_64, ppc) Open Source/Closed Source SIP, IAX SSL,TLS Multitenant, Four levels management interface, Provisioning, Virtualization, Call routing, prepaid and postpaid billing, Call queues, Conferences, IVRs, Callback, Calling cards Service provides, SMB 1.6.0, (May 15, 2008)
Asterisk PBX Linux, BSD, Mac OS X GPL free software / Proprietary SIP, H.323, IAX       1.4.9.2, May 13, 2008
Brekeke PBX Windows and Linux Free 60-day trial / Closed Proprietary SIP IP PBX, Voicemail, Conference, ARS, IVR, Auto Attendant, Queuing, Web service, Plugin APIs Carriers, ITSP, Hosting Providers, Enterprise, SMB 2.1
Brekeke SIP Server Windows, Linux, Mac OS and Solaris Free Academic License / Free 60-day trial / Closed Proprietary SIP SIP Registrar/Proxy, NAT Traversal, Authentication, Dial Plan, Multiple-Domains Hosting, UDP/TCP Conversion, UPnP, Plugin APIs Carriers, ITSP, Enterprise, SMB, R&D 2.1
BroadSoft BroadWorks Linux and Solaris Closed Proprietary SIP SIP Registrar/Proxy, Advanced Telephony Features, Audio Conferencing, Point-to-Point Videoconferencing, Mobile/Cellular Integration, Call Center/ACD, Regulatory Compliance, Desktop Productivity Applications (Windows based), Web Portal, PSTN Routing and Translations, Open APIs Carriers and ITSPs, Residential and Enterprise R14SP3
CallWeaver Linux, BSD, Mac OS X, Solaris GPL SIP, H.323, IAX SRTP Mature T.38 pass-through and termination support Home use to Enterprise-level 1.2.0.1 (May 27, 2008)
Customer Interaction Center Windows 2003/XP Closed Proprietary SIP IP PBX, ACD, IVR, Unified Messaging, Multi-media queueing, Skills-based routing Enterprise and Contact (Call) Centers 2.4
Eyeball Server Suite Red Hat Eneterprise 4 and Fedora Core 4 or higher Proprietary SIP, XMPP, STUN, TURN ICE NAT Traversal IM server, NAT Traversal Server, SIP Proxy Enterprise, Developer, Service Providers
CommuniGate Pro Solaris, Linux, BSD, Mac OS X, Windows, AIX, HPUX Freeware / Closed Proprietary SIP, XMPP, XIMSS TLS/SSL/HTTPS/SRTP/File Encryption/Cert Authority VirtualPBX, Conferencing, ACD, Development environment, Flash UI Carriers, IT-SP, Enterprise 5.1.x
ComunIP SIP Server Linux, Microsoft Windows Closed Proprietary SIP, HTTP, Fast-CGI TLS/SSL General-purpose SIP server with a SOA architecture - uses Fast-CGI as backend processing (PHP as default language for customizing server-side applications), full web server integration (Apache, Lighttpd) Application Service Provider Model to Carrier Grade, including support of SaaS delivery model 2.5.0 (July 31, 2007)
FreeSWITCH Windows, Linux, BSD, Solaris Open MPL free software SIP, STUN, XMPP, Jabber, IAX TLS, SRTP Recording, Voicemail, Jabber IM, Google Talk, Proxy, Media gateway, Soft-PBX, IVR, Large soft-switch users, home pbx users, softphone users 1.0.0 (May 26, 2008)
GNU Gatekeeper Linux, Mac OS X, Windows XP/2000, FreeBSD GPL Free software H.323 Routing, Accounting, AUthorization 2.2.4
IXC Softswitch FreeBSD Closed/ Proprietary H.323, SIP, MGCP, RADIUS Includes integrated billing, codecs transcoding, protocol conversion, financial tools. Carriers, ITSP, Enterprise, SMB. Services: origination, termination, DIDs, calling cards 4.4.x
miniSipServer windows NT,2000,XP,2003 Closed Proprietary SIP,SMB,SOHO SIP server and SIP-PBX for the windows platform Carriers, ITSP, Hosting Providers, Enterprise, SMB,SOHO,Individuals 2.2.8 SP1
Mysipswitch Linux BSD free software Open source SIP, Ajax SSL SIP proxy server which allows the use of multiple SIP accounts with a single SIP login Individuals August 2007
Nortel's application Server 5200(mcs) Linux Proprietary SIP , H.323 SSL encryption multimedia conferencing, instant messaging (IM), presence and other collaboration tools Unified Communication 5200
NetUP UTM billing software Linux, FreeBSD, Solaris, Windows (NT, 2000, XP, 2003) Closed Proprietary H.323, SIP RADIUS Java-based multiplatform administration interface VoIP providers and ISP 5.2.1-001
OpenSER Linux, BSD, Solaris GPL free software Open source SIP TLS ENUM, IM, XMPP IM gateway, SMS gateway Carrier, ITSP, Enterprise 1.2.2
PACER Windows, Linux, Solaris, AIX, HPUX Closed Proprietary TLS, SSL, HTTPS IVR, Voice broadcasting, Virtual PBX, ACD, XML Messaging, Development environment Enterprise, Developer, Service Providers 12.1
pbxnsip Windows, Linux Closed Proprietary SIP TLS for signalling, SRTP and SDES for media and key exchange IVR, Multicast Paging, Call Recording, Barge In, NAT-Traversal, Trunking, Cell Phone Support, Built-in mini-SBC, multiple-IP Address, Plug and Play, IM+Presence, IPv6 Appliances, Server 2.1 (release)
Solegy-OSS Desktop Dialer Microsoft Windows Freeware SIP Hash (CBCOM mode) Encryption IM (SIP/SIMPLE or Jabber), NAT Traversal (STUN), multiple codecs Service Providers, Developers Beta (December 2006)
SIP Express Router (SER) BSD, Linux, Solaris GPL free software SIP SIP Registrar/Proxy, Authentication, Diameter, RADIUS, ENUM, and many others... SIP Service Providers 2.0.0 Ottendorf
sipX ECS IP PBX Linux Open source L-GPL Native SIP Call Control HTTPS, TLS Full redundancy (HA), plug & play management including phones and gateways, fully featured Enterprises between 200 and 10,000 users, multi-site 3.6, Feb 12, 2007
SoftBX Microsoft Windows XP/Server 2000/2003,Windows Mobile 6 Closed Proprietary SIP, H.323, CAPI, 4-2000 users/per server, up to 512,000 ITSP platform, Voice Mail, Conference, Call Centre ITSP Hosting Platforms, PBX replacement, Appliances 4.3.1001 (June 2007)
*starShop Open source GPL Based on Asterisk PBX (PBX, not client) Calling Shops and Internet cafes. 0.02 (29th of November 2005)
SwyxWare Microsoft Windows XP/2000/2003/Vista, Windows Mobile, Symbian, Black Berry Closed Proprietary SIP, H.323, CAPI Too Many to List Businesses from 5 users to 10000 Users 6.11 (19th February 2008)
TERAVoice Server Windows 2000, XP, 2003, Vista Freeware / Closed Proprietary SIP, H.323, ISDN, analog TLS Soft-PBX, IVR, Voicemail, Voice Portal Server 2004 (17th of April 2005)
YATE FreeBSD, Linux, Microsoft Windows, Solaris GPL free software Open source H.323, IAX, Jingle, SIP SoftPBX, SIP SBC/Registrar/Proxy, H.323 Proxy, FAX, IVR, Conference, Music on Hold, Radius Small office to carrier grade 1.2.0 (16th April 2007)
Program Operating systems Licence Protocols/based upon/compatible with Encryption Other capabilities Key and target markets Latest release

[edit] See also