Comparison of VoIP software

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.

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	Template:Latest stable release/Coccinella
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	Template:Latest stable software release/Ekiga
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.	2.2.1 (22 June 2011 (2011-06-22)) [±]
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	2.10 (build.5550) (February 5, 2017 (2017-02-05)) [±] Template:Latest preview software release/SIP Communicator
SFLphone	Linux	GPL free software	SIP,IAX2,STUN			0.9.2 (January 21, 2009)
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...)	Windows, UWP 15.123.203.0 / 8 July 2024 (2024-07-08) Windows, desktop 8.123.0.203 / 8 July 2024 (2024-07-08) macOS 8.123.0.203 / 8 July 2024 (2024-07-08) Linux 8.123.0.203 / 8 July 2024 (2024-07-08) Android 8.123.0.203 / 8 July 2024 (2024-07-08) iOS 8.123.0.203 / 8 July 2024 (2024-07-08) (iPhone and iPad)
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		1.10.3 (February 19, 2022 (2022-02-19)) [±]
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
Windows Live Messenger	Microsoft Windows	Freeware
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, Solaris	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	1.0.2 (January 1, 2009)
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

See also

• Voice over IP
• Mobile VoIP
• Secure communication
• softphone
• Video conference