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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

General softphone clients

Program Operating systems License Protocols/based upon/compatible with Encryption Other capabilities Latest release
AOL Instant Messenger MS Windows, Mac OS, Linux Freeware SIP (MS Windows ver. only), 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
Cisco IP Communicator Windows Closed Proprietary SCCP (Skinny), SIP, TFTP sRTP 7.0.1 (17-Dec-2008)
Coccinella FreeBSD, Linux, Mac OS X, Windows GPL Free software XMPP, IAX Supports TLS/SSL and SASL File transfer, whiteboard 0.96.10  (September 24, 2008)
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
Ekiga (formerly GnomeMeeting) Linux, (Beta Windows support) GPL Free software SIP, H.323, H.263, H.264/MPEG-4 AVC, STUN, Theora, Zeroconf None Video, IM, LDAP, Call Forwarding, Call Transfer 3.0.1  (October 20, 2008)
Empathy Linux GPL Free software SIP, XMPP (Jingle), ICE (STUN/TURN), Zeroconf None yet IM, multi-user A/V, collaborative applications 0.23 (15-Jul-2008)

Gizmo5 VOIP ITP SoftPhone

Windows, Windows Mobile Phone, Mac OS X, Linux, Blackberry, Nokia, PDA Java Closed Proprietary Freeware

SIP, XMPP, Jabber

(Secure Real-time Transport Protocol)

SRTP

Record Calls, Forward Calls, MSN IM, Windows Live Talk, Google Talk, Talk with Yahoo, Messenger, Jabber IM

4.0.0.369 2008 May 21 -Windows 3.1.2 (v222) 2007 Oct 31 -MacOS (As of May '08)

Google Talk Mac OS X, Windows XP/2000 Freeware (libjingle is Free software XMPP, Jabber Video, chat, file transfer, voicemail, mail via "GMail Integration" 1.0.0.104
iChat AV Mac Closed Proprietary SIP AIM ICQ Jabber H263 H264 Integrated, PBX independent January 2007
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 2007)
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)
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
Mirial Softphone (Mirial s.u.r.l., 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), 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, Ultra-wideband, G.711,G.722, G.723.1, G.726, G.729, Speex, GSM, iLBC, MPEG1, MPEG4, MJPG, Theora, H263, H264 SSL/TLS, SRTP File transfer,File-Sharing and Remote Desktop over SIP, Auto QoS, Outlook, Skype, LDAP, XCAP synchronization and remote profile storage 1.2.4 (November 8, 2008)
Mumble Windows, Mac OS X, Linux, and BSD (server) GPLv2 Speex SSL Chat with (limited) embedded HTML, ACLs for user management, Customizable In-Game Overlay, Directional Audio, Plugin Support, Nested Channels 1.1.4
OfficeSIP Messenger Microsoft Windows Freeware SIP (UDP, TCP, TLS) and RTP (media) Video, instant messaging 1.5 (December 12, 2008)
PhoneGaim Linux (Linspire), Windows XP/2000 GPL free software SIP
QuteCom Linux, Windows XP/2000, SmartPhone, Windows Mobile GPL free software SIP AES-128 Video, IM (MSN, AIM, ICQ, Yahoo!, Jabber, GoogleTalk), voicemail, wengo to phone. 2.2 RC3  (December 18, 2008)
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 secure calls with zRTP is planned for 1.0-rc1 Text messaging, audio/video telephony, basic IPv6 1.0-alpha2  (November 02, 2007) 1.0-alpha3  (unreleased)
Sippoint Mini Windows 2000, XP, Vista Freeware XIMSS G.711,G.723,G.729, Speex PC to phone, phone to PC 1.0.1.124
Skype Windows 2000/XP, Mac OS X, Linux(32-bit i386 only), Windows Mobile Freeware Proprietary P2P protocol AES-256, Skype Encryption Video, file transfer, voicemail, Skype to phone, phone to Skype, additional P2P extensions (games, whiteboard, etc...) 3.8.0.188 (Windows),
2.7.0.330 (Mac OS X),
2.0.0.72 (Linux x86),
2.2.0.45 (Windows Mobile Professional (Pocket PC)),
2.2.0.44 (Windows Mobile Standard (Smartphone))
 (November 19, 2008 (Windows),
May 14, 2008 (Mac OS X),
March 27, 2008 (Linux),
July 31, 2008 (Windows Mobile Professional (Pocket PC)),
May 9, 2008 (Windows Mobile Standard (Smartphone))
)

/

Teamspeak Windows, Linux, Mac OS X (unofficial) Freeware Closed Proprietary conferencing 2.0.32.60
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 1.3.2  (August 24, 2008
)
Vbuzzer Windows XP Closed / Proprietary freeware SIP TLS IM (MSN), voicemail, personalized voice greeting. 2.0.282
Ventrilo Windows, Mac OS X Freeware Closed Proprietary Conferencing, chat, text-to-speech 3.0.4
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
Zfone (formerly PGPfone) Linux, Mac OS X, Windows Viewable source / Proprietary license (includes time bomb provision) SIP and RTP SRTP, ZRTP Beta 2008-09-04 (Linux 0.9.224), (MacOS 0.9.246), (Win 0.9.206)

Hosted services

Program Licence Protocols/based upon/compatible with Encryption Other capabilities Latest release
Jajah Closed source Connects together two conventional phones.


Mobile phones

Program Operating systems Licence Protocols/based upon/compatible with Encryption Other capabilities Latest release

fring

Symbian 8 or 9 Windows Mobile 5 or 6 iPhone

proprietary

Session Initiation Protocol|SIP, Skype, Google Talk, MSN Messenger, Twitter, ICQ, AOL Instant Messenger|AIM, Yahoo

?E

?OC

?LR

Gizmo5 Mobile

Windows Mobile, Pocket PC, Motorola, Nokia, Blackberry, Java PDA's, Sony-Ericsson, Samsung

Freeware

SIP, AIM, iChat, Jabber, MSN, Yahoo

Yes

Online Phone over Edge, UMTS, 3G, Call Land and Cell phone, Voicemail, AOL, iChat, Jabber IM, Yahoo! Messenger, Windows Live

1.15 (as of May '08)

Nimbuzz!

J2ME, S60, Windows Mobile and Windows

Closed source, freeware

GoogleTalk, Skype, SIP, AOL Instant Messenger, Windows Live Messenger, Yahoo! Instant Messenger, Jabber

?E

?OC

0.9.6

Truphone

Nokia-Symbian, iPhone

Proprietary Freeware

Session Initiation Protocol|SIP

?E

WiFi VoIP out & in, SMS over IP, call-through & call-back, connection management, provisioning

4.0 Symbian, 1.11.1 iPhone

Windows Mobile 6

Windows Mobile 6 Professional/Standard

Freeware

Session Initiation Protocol|SIP

?E

?OC

?LR

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)
Telepathy/Farsight Linux, Mac OS X, Windows LGPL free software SIP, XMPP (Jingle), ICE (STUN/TURN), UPnP None yet Multi-user A/V conferencing, IM, collaborative applications Mobile devices (Maemo), Linux Desktop spec 0.17.8 (24-Jul-2008)

Server software

Program Operating systems Licence Protocols/based upon/compatible with Encryption Other capabilities Key and target markets Latest release
3CX IP PBX Windows Server XP, 2003, 2008 Closed Proprietary SIP 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) 6.1 (October 2008)
Asterisk PBX Linux, BSD, Mac OS X GPL free software / Proprietary SIP, H.323, IAX       1.4.22, October 2, 2008

FreeSWITCH PBX SoftPhone

BSD, Linux, Mac OS X, Solaris, Windows

Open source, Mozilla Public License, Free software

SIP, STUN, XMPP, Jabber, IAX, FreeSWITCH

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 2.2.7, April 2nd, 2008
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
Objectworld UC Server Windows Server XP, 2003, 2008 Closed Proprietary SIP 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) 4.3 (September 2008)
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
Program Operating systems Licence Protocols/based upon/compatible with Encryption Other capabilities Key and target markets Latest release

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