Skype

 Skype (IPA: [skaɪp]) is a software application that allows users to make telephone calls over the Internet. Calls to other users of the service, and in some countries to free-of-charge numbers are free, while calls to other landlines and mobile phones can be made for a fee. Additional features include instant messaging, file transfer and video conferencing.

Skype was written by Estonia-based developers Ahti Heinla, Priit Kasesalu and Jaan Tallinn, who had also originally developed Kazaa.[1] The Skype Group, founded by Swedish-born entrepreneur Niklas Zennström and the Dane Janus Friis, has its headquarters in Luxembourg, with offices in London, Tallinn, Tartu, Stockholm, Prague,[2] and San Jose.

One of the initial names for the project was "Sky peer-to-peer", which was then abbreviated to "Skyper". However some of the domain names associated with "Skyper" were already taken. Dropping the final 'r' left the current title "Skype", for which domain names were available.[3]

Skype has experienced rapid growth in popular usage since the launch of its services. The company was acquired by eBay in September 2005 for $2.6 billion.[4] EBay has written Skype down to $1.7 billion on its books and announced a public stock offering for 2010 to spin Skype off as a separate company.[5]

 
 

Features

Main article: Features of Skype

SkypeIn allows Skype users to receive calls on their computers dialed by regular phone subscribers to a local Skype phone number; local numbers are available for Australia, Brazil, Chile, Colombia, Denmark, Dominican Republic, Estonia, Finland, France, Germany, Hong Kong, Hungary, Ireland, Italy, Japan, Mexico, New Zealand, Poland, Romania, South Korea, Sweden, Switzerland, the Netherlands, the United Kingdom, and the United States.[6][7] A Skype user can have local numbers in any of these countries, with calls to the number charged at the same rate as calls to fixed lines in the country. Some jurisdictions, including France and Germany, forbid the registration of their telephone numbers to anyone without a physical presence or residency in the country[citation needed].

Video conferencing was introduced in January 2006 for the Windows and Mac OS X platform clients. Skype 2.0 for Linux, which was released on March 13, 2008, also features support for video conferencing.[8] Skype for Windows, starting with version 3.6.0.216, supports "High Quality Video" with quality and features (e.g. full-screen and screen-in-screen modes) similar to that of mid-range videoconferencing systems.[9] Skype conferences currently support up to 25 people at a time, including the host.

The word 'Skypecasting' is a portmanteau of 'Skype' and 'broadcasting'. Its original usage referred to recording Skype voice over IP voice calls and teleconferences. The recordings would be used as podcasts, which allow audio or video content to be syndicated over the Internet. Skype launched a "Skypecasts Beta" service in 2006 where it remained in beta until its end in September 2008. Skypecasts hosted public conference calls, up to 100 people at a time. Unlike ordinary Skype p2p conference calls, Skypecasts support moderation features suitable for panel discussions, lectures, and town hall forums. Skype operated a directory of public Skypecasts. On August 26, 2008, Skype announced that Skypecasts would be discontinued beginning September 1, 2008.[10] 1 September 2008 at 12:00 GMT, Skypecasts were shutdown without any concrete explanation.

Skype does not provide the ability to call emergency numbers such as 911 in the USA and Canada, 000 in Australia, 112 in Europe, or 999 in the UK.[11]FCC has ruled that, for the purposes of the section 255 of the Telecommunications Act, Skype is not an "interconnected VoIP provider".[12] As a result, the US National Emergency Number Association recommends that all VoIP users have an analog line available as a backup.[13]

 

 

Skype Clients

  • On April 24, 2008, Skype announced that they offer Skype on around 50 mobile phones.[14]
  • On October 29, 2007, Skype launched its own mobile phone under the brand name 3 Skypephone, which runs a BREW OS.[15]
  • Skype is available for the N800 and N810 Internet Tablets, which use the Linux Maemo environment.
  • Skype is available on both the Sony Mylo COM-1 and newer COM-2 models.
  • Skype is available for the PSP (PlayStation Portable) Slim and Lite with firmware version 3.90 or higher, but the user needs to purchase one of three microphone input peripherals.
  • The new PSP-3000 has a built in microphone which allows communication without the Skype peripheral[16]
  • Skype is available on mobile devices running Windows Mobile.[17]
  • The official Symbian version was under development in 2006, but was not released.[18]
  • Official Skype support is available as part of X-Series together with mobile operator 3. However this uses a regular mobile phone call and iskoot[19]WiFi. to a Skype gateway, rather than mobile internet. Other companies produce dedicated Skype phones which connect via
  • Third party developers, such as Nimbuzz and Fring, have allowed Skype to run in parallel with several other competing VoIP/IM networks in any Symbian or Java environment. Nimbuzz has made Skype available to BlackBerry users.
  • An official free Skype application for the iPhone OS was released in the iTunes store on March 31 2009.[20] However, some network operators do not allow Skype calls to be made from their 3G, so if users want to use Skype on iPhone they need to connect it to a wifi network first.[21]


 
 

History

  • September 2002, investment from Draper Investment Company and at that time, original name was Skyper.[citation needed]
  • April 2003, Skype.com and Skype.net domain names registered.
  • August 2003, First public beta version released.
  • September 2005, SkypeOut banned in South China.[22]
  • October 2005, eBay purchased Skype (Oct 14).[23]
  • December 2005, videotelephony introduced.[24] In April 2006, Number of registered users reaches 100 million.
  • October 2006, Skype 2.0 for Mac is released, the first full release of Skype with video for Macintosh.
  • December 2006: Skype announces a new pricing structure as of January 18, 2007, with connection fees for all SkypeOut calls.[25] Skype 3.0 for Windows is released.[26]
  • In March 2007, Skype 3.1 is released, adding some new features, including Skype Find and Skype Prime. Skype also released a 3.2 beta with a new feature called Send Money which allows users to send money via PayPal from one Skype user to another.
  • August 2007, Skype 3.5 for Windows released with additions such as video in mood, inclusion of video content in chat, call transfer to another person or a group, auto-redial.
  • August 15, 2007, Skype 2.7.0.49 (beta) for Mac OS X released adding availability of contacts in the Mac Address Book to the Skype contact list, auto redial, contact groups, public chat creation, and an in-window volume slider to the call window.
  • August 16 / August 17, 2007, Skype users unable to connect to full Skype network in many countries.[27] Skype reports the system-wide crash was the result of exceptional number of logins after a Windows patch reboot ("Patch Tuesday").[28]
  • November 2007, Skype users are set to lose their 020 7 numbers after December 20, 2007.[29]
  • January 30, 2008, Skype released for the Sony PSP hand-held gaming system.
  • March 13, 2008, Skype 2.0 for Linux released with support for videoconferencing.
  • July 9, 2008, Skype 4.0 Beta is released, changing Skype into a full-screen application.[30]
  • September 1, 2008, Skype discontinues its SkypeCast service, citing difficulties in moderating chat rooms.
  • September 8, 2008, The seventh season of Who Wants To Be a Millionaire premieres—the new Ask the Expert lifeline uses Skype for video chat.
  • September 30, 2008, Skype 4.0 Beta 2 released, introducing 'Compact mode', after user criticism of the new default full-screen mode.[31]
  • October 2, 2008: Analysis reveals TOM-skype sends content of text messages and encryption keys to monitoring servers.[32]
  • November 2008, Skype added internal monthly and daily usage caps on their SkypeOut subscriptions advertised as "Unlimited". Many users and observers have commented on the high rate of dropped calls, and the difficulty of reconnecting dropped calls. These are most common for video calls and free (PC to PC) calls.[33]
  • Feb 6, 2009, Skype 4.0 is released.[34]
  • March 2009, Skype launched Skype for SIP, a service aimed at business users. At the time of launch around 35% of Skype's users were business (rather than personal).[35]
  • April 14, 2009, eBay announced plans to spinoff of Skype through an initial public offering in 2010. [5]


Usage and traffic

http://www.slideshare.net/earningreport/presentation-on-q1-2009-earning-report-of-ebay-inc

Date Total user accounts
(in millions)[36][37][38][39][40][41]
Active users - daily presence
(in millions)[42]
Skype to Skype minutes
(in billions)
SkypeOut minutes
(in billions)
Net revenue USD
(in millions)
Q4 2005 74.7 10.8 N/A N/A N/A
Q1 2006 94.6 15.2 6.9 0.7 35
Q2 2006 113.1 16.6 7.1 0.8 44
Q3 2006 135.9 18.7 6.6 1.1 50
Q4 2006 171.2 21.2 7.6 1.5 66
Q1 2007 195.5 23.2 7.7 1.3 79
Q2 2007 219.6 23.9 7.1 1.3 90
Q3 2007 245.7 24.2 6.1 1.4 98
Q4 2007 276.3 27.0 11.9 1.6 115
Q1 2008 309.3 31.3 14.2 1.7 126
Q2 2008 338.2 32.0 14.8 1.9 136
Q3 2008 370 33.7 16 2.2 143
Q4 2008 405 36.5 20.5 2.6 145
Q1 2009 443 42.2 23.6 2.9 153

Users may have more than one account, and it is not possible to identify users with multiple accounts.

It was reported that 17,443,598 concurrent Skype users were online as of May 11, 2009.[43]

As of January 2009, Skype is available for Android and over 100 Java enabled mobile phones. As of January 2009, Skype is adding about 30 million subscribers a quarter.[citation needed]

Text Box

The volume of international traffic routed via Skype is significant, it has become the largest international voice carrier.[45] . Computer-to-computer traffic between Skype users in 2005 was 2.9% of international carrier traffic in 2005 and about 4.4% of the total international traffic of 264 billion minutes in 2006.[46] In 2008, about 8% of cross-border calls were carried by Skype.[47]

Skype incorporates some features which tend to hide its traffic, but it is not specifically designed to thwart traffic analysis and therefore does not provide anonymous communication. Some researchers have been able to watermark the traffic so that it is identifiable even after passing through an anonymizing network.[48]

SkypeNOW! is a service that Skype offers in South Africa to customers with Vodafone mobile service, which can enable Vodafone users to engage in Skype international voice calls wirelessly.

Date Users[44] Days
2009-03-23 17,000,000 49
2009-02-02 16,000,000 21
2009-01-12 15,000,000 84
2008-10-20 14,000,000 35
2008-09-15 13,000,000 209
2008-02-18 12,000,000 42
2008-01-07 11,000,000 84
2007-10-15 10,000,000 259
2007-01-29 9,000,000 82
2006-11-08 8,000,000 71
2006-08-29 7,000,000 155
2006-03-27 6,000,000 66
2006-01-20 5,000,000 92
2005-10-20 4,000,000 155
2005-05-18 3,000,000 93
2005-02-14 2,000,000 117
2004-10-20 1,000,000 418
2003-08-29 0 -

The volume of international traffic routed via Skype is significant, it has become the largest international voice carrier.[45] . Computer-to-computer traffic between Skype users in 2005 was 2.9% of international carrier traffic in 2005 and about 4.4% of the total international traffic of 264 billion minutes in 2006.[46] In 2008, about 8% of cross-border calls were carried by Skype.[47]

Skype incorporates some features which tend to hide its traffic, but it is not specifically designed to thwart traffic analysis and therefore does not provide anonymous communication. Some researchers have been able to watermark the traffic so that it is identifiable even after passing through an anonymizing network.[48]

SkypeNOW! is a service that Skype offers in South Africa to customers with Vodafone mobile service, which can enable Vodafone users to engage in Skype international voice calls wirelessly.

   

System and software

Skype uses a proprietary Internet telephony (VoIP) network, called the Skype protocol. The protocol has not been made publicly available by Skype and official applications using the protocol are proprietary and closed-source. The main difference between Skype and standard VoIP clients is that Skype operates on a peer-to-peer model (originally based on the Kazaa software[49]) rather than the more usual client-server model. The Skype user directory is entirely decentralized and distributed among the nodes of the network—i.e., users' computers—which allows the network to scale very easily to large sizes (currently about 240 million users)[50] without a complex centralized infrastructure costly to the Skype Group. The disadvantage of this approach is that Skype offers no interoperability with SIP-based VOIP networks.

Many networking and security companies claim to detect and control Skype's protocol for enterprise and carrier applications[who?]. While the specific detection methods used by these companies are often private, Pearson's Chi-Square Test and stochastic characterization with Naïve Bayesian Classifiers are two approaches that were published in 2007.[51]

Skype uses an array of different audio compression methods including G.729 and SVOPC. Skype added a Skype-created codec called SILK to Skype for Windows 4 and other Skype clients. SILK is intended to be "lightweight and embeddable".[52]

Skype security is a secure communication; encryption cannot be disabled, and is invisible to the user. Skype reportedly uses non-proprietary, widely trusted encryption techniques: RSA for key negotiation and the Advanced Encryption Standard to encrypt conversations.[53] Skype provides an uncontrolled registration system for users with absolutely no proof of identity. This permits users to use the system without revealing their identity to other users. It is trivial, of course, for anybody to set up an account using any name; the displayed caller's name is no guarantee of authenticity. A third party paper analyzing the security and methodology of Skype was presented at Black Hat Europe 2006. It analyzed Skype and found a number of security issues with the current security model.[54]

Versions exist for Linux, Linux-based Maemo, Mac OS X (Intel and PPC), iPhone OS (iPhone and iPod Touch), Microsoft Windows (2000, XP, Vista, Windows Mobile), and even Sony's PSP[55]

Skype 1.4, running on a Linux desktop.
Skype 1.4, running on a Linux desktop.  
Skype 2.7, running on Mac OS X.
Skype 2.7, running on Mac OS X.  
Skype 2.2, running on a Windows Mobile 6 device.
Skype 2.2, running on a Windows Mobile 6 device.  
Skype 4 in Default View running on Windows Vista.
Skype 4 in Default View running on Windows Vista.  
Skype 4 in Default View running on Windows XP.
Skype 4 in Default View running on Windows XP.  
Skype 1.0.2 running on iPhone.
Skype 1.0.2 running on iPhone.  

   

Privacy

In an interview with Kurt Sauer, Chief Security Officer Skype, he said, "We provide a safe communication option. I will not tell you whether we listen or not."[56] Skype's client uses an undocumented and proprietary protocol. The Free Software Foundation (FSF) is concerned by user privacy issues arising from using proprietary software and protocols and has made replacement for Skype one of their high priority projects.[57] Security researchers Biondi and Desclaux have speculated that Skype may have a backdoor since Skype sends traffic even when it is turned off and because Skype has taken extreme measures to obfuscate their traffic and functioning of their program.[58] Several media sources have reported that at a meeting about the "Lawful interception of IP based services" held on 25 June 2008, officials[who?] at the Austrian interior ministry said "it is not a problem for them to listen in on Skype conversations". Austrian broadcaster ORF citing minutes from the meeting have reported that "the Austrian police are able to listen in on Skype connections".[59][60] Skype declined to comment on the reports.[61]

In the United States, the FCC has interpreted the Communications Assistance for Law Enforcement Act as requiring digital phone networks to allow wiretapping in the presence of an FBI warrant, in the same way as traditional phone service. Skype is not yet compliant with the act and has, so far, stated that it does not plan to comply.[62] According to the ACLU, the Act is inconsistent with the original intent of the Fourth Amendment to the U.S. Constitution;[63] more recently, the ACLU has expressed the concern that the FCC interpretation of the Act is incorrect.[64][65] A number of individuals involved in publicly disclosing this information have been placed under investigation.[65]

Since September 2007, users in China trying to download the Skype software have been redirected to the site of TOM, a joint venture between a Chinese wireless operator and Skype, from which a modified Chinese version can be downloaded.[66] The TOM client participates in China's system of internet censorship, monitoring text messages between Skype users in China as well as messages exchanged with users outside the country.[67][68] Niklas Zennström, then chief executive of Skype, told reporters that TOM "had implemented a text filter, which is what everyone else in that market is doing. Those are the regulations." He also stated: "One thing that’s certain is that those things are in no way jeopardising the privacy or the security of any of the users."[69] In October 2008, it was reported that TOM had been saving the full message contents of some Skype text conversations on its servers, apparently focusing on conversations containing political issues such as Tibet, Falun Gong, Taiwan independence, the Chinese Communist Party, milk powder, the 2008 Sichuan earthquake, and democracy. The saved messages contain personally identifiable information about the messages' senders and recipients, including IP addresses, usernames, land line phone numbers, and the entire content of the text messages, including the time and date of each message. This information was also saved for Skype users outside China who were communicating with a TOM-Skype user. Due to a server misconfiguration, these log files were for a time accessible to the public.[68][70][71]

On February 2009 Eurojust started working on lawful interception of Skype and VoIP.[citation needed]

[edit] Customer service

There have been a multitude of complaints about Skype's poor customer support.[72][73] As of April 2009, Skype does not provide a way to contact customer support, offering indirect assistance through its web portal only.

   

Comparison of VoIP software

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This list is incomplete; you can help by expanding it.

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.

Softphones are end user based clients for initiating and receiving voice and video communications over the IP network with the standard functionality of most "original" telephones and usually allow integration with IP Phones and USB Phones instead of utilizing a computer's microphone and speakers (or headset). Most softphone clients run on the open SIP supporting various codecs. Skype runs on a closed proprietary network. "Chat" programs now also incorporate voice and video communications.

Other VoIP software applications include conferencing servers, intercom systems, virtual FXOs and adapted telephony software which concurrently support VoIP and PSTN like IVR systems, dial in dictation, on hold and call recording servers.

Contents

[hide]

[edit] 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 Unknown 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 MS Windows Freeware / Closed Proprietary
Unknown Text chat, File transfer, Video chat, Screen-shot, Screen-sharing, Whiteboard, Voice mail, Co-browse 2.0.2
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 TLS/SSL and SASL File transfer, whiteboard 0.96.12

 (March 18, 2009)

ComunIP Softphone Windows Closed Proprietary SIP, RTP, STUN, ICE, Tunneling, TFTP, iLBC, G.711, G.729, H.263, H.264, LSVX, NAPTR/SRV, AJAX TLS/SSL and SASL File transfer, Instant Messaging, Autoupdate, Tunneling and NAT traversal 3.0.3 (20-May-2008)
CounterPath X-Lite Windows, Mac, Linux Freeware SIP, STUN, ICE Unknown 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 No Video, IM, LDAP, Call Forwarding, Call Transfer 3.2.0

 (March 17, 2009)

Empathy Linux GPL Free software SIP, XMPP (Jingle), ICE (STUN/TURN), Zeroconf No IM, multi-user A/V, collaborative applications 0.23 (15-Jul-2008)
Gizmo5 Windows, Windows Mobile Phone, Mac OS X, Linux, Blackberry, Nokia, PDA Java Closed Proprietary Freeware SIP, XMPP, Jabber SRTP Record Calls, Forward Calls, MSN IM, Windows Live Talk, Google Talk, Talk with Yahoo, Messenger, Jabber IM Windows: 4.0.0.369 (2008 May 21), MacOS: 3.1.2 (2007 Oct 31)
Google Talk Mac OS X, Windows XP/2000 Freeware (libjingle is Free software XMPP, Jabber Unknown Video, chat, file transfer, voicemail, mail via "GMail Integration" 1.0.0.104
iChat AV Mac Closed Proprietary SIP AIM ICQ Jabber H263 H264 Unknown 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 Unknown
0.7.0 (2 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 (22 September 2006)
Linphone Linux and Microsoft Windows GPL Free software SIP Unknown Video, IM, STUN, IPv6 3.0.0 (13 Oct 2008)
Lotus Sametime Linux and Microsoft Windows, Mac OS X Closed Proprietary SIP, SIMPLE, T.120 and H.323 Unknown
7.5.1 (April 2007)
MindSpring (formerly Vling) Windows 2000, Windows XP Freeware SIP, XMPP Unknown 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 DTLS-SRTP 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) 6.2 (February 23, 2009)
Mumble Windows, Mac OS X, Linux, and BSD (server only) GPLv2 Speex SSL Chat with (limited) embedded HTML, ACLs for user management, Customizable In-Game Overlay, Directional Audio, Plugin Support, Nested Channels 1.1.8 (March 22, 2009)
OctroTalk Symbian, Windows Mobile, and Windows Shareware SIP, (Jabber, XMPP, STUN, ICE, Libjingle and RTP (media) TLS and SASL VoIP, SIP calling, Video conference/chat, live video streaming, P2P file transfer, instant messaging 2.14 (February 17, 2009)
OfficeSIP Messenger Microsoft Windows Freeware SIP (UDP, TCP, TLS) and RTP (media) TLS Video, instant messaging 1.7 (April 10, 2009)
PhoneGaim Linux (Linspire), Windows XP/2000 GPL free software SIP Unknown

QuteCom Linux, Windows XP/2000 GPL free software SIP AES-128 Video, IM (MSN, AIM, ICQ, Yahoo!, Jabber, GoogleTalk), voicemail, wengo to phone, conferencing. 2.2 RC3

 (December 18, 2008)

SFLphone Linux GPL free software SIP,IAX2,STUN Unknown
0.9.2 (January 21, 2009)
SightSpeed Mac OS X / Windows Freeware SIP,RTP,Proprietary P2P protocol Unknown 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)

Skype Windows 2000/XP, Mac OS X, Linux, Windows Mobile, iPhone Freeware Proprietary P2P protocol Yes Video, file transfer, voicemail, Skype to phone, phone to Skype, additional P2P extensions (games, whiteboard, etc...) 4.0.0.226

 (April 23, 2009 (Microsoft Windows), others by platform)

TeamSpeak Windows, Linux, Mac OS X (unofficial) Freeware Closed Proprietary
No conferencing 2.0.32.60
Telephone Mac OS X Freeware SIP, STUN, ICE No Address Book integration 0.13.3
Tokbox Mac OS X, Windows XP/2000, Windows Vista Freeware Unknown Unknown Video calling, video conferencing, chat, IM (MSN, AIM, Yahoo!, GoogleTalk) Unknown
Tpad Windows XP, Windows 2000, Windows Vista Freeware Closed Proprietary SIP, STUN Unknown Call Forwarding, PC to PSTN, PSTN to PC, Voicemail to email 3.0.1
Twinkle Linux GPL free software SIP SRTP, ZRTP
1.4.2

 (2009-02-25)

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
No Conferencing, chat, text-to-speech 3.0.4
Windows Live Messenger (Windows Live Call) Microsoft Windows Freeware
Unknown

Yahoo! Messenger Microsoft Windows, Mac OS (8, 9, X), (Linux/FreeBSD version not VoIP capable) Freeware SIP (using TLS) and RTP (media) Unknown 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)

[edit] Hosted services

Program  ↓ Licence  ↓ Protocols/based upon/compatible with  ↓ Encryption  ↓ Other capabilities  ↓ Latest release  ↓
Jajah Closed source

Connects together two conventional phones.

[edit] Mobile phones

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

fring

Symbian 8.x and 9.x Windows Mobile 5 and 6 iPhone

proprietary

SIP, Skype, Google Talk, MSN Messenger, Twitter, ICQ, AIM, Yahoo

?E

?OC

3.37

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, AIM, Windows Live Messenger, Yahoo! Instant Messenger, Jabber

?E

?OC

2.0

Truphone

Nokia-Symbian, iPhone

Proprietary Freeware

SIP

?E

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

4.0 Symbian, 1.11.1 iPhone

Vopium

Symbian, J2ME, Android, BlackBerry RIM, iPhone, Windows Mobile

Proprietary freeware

SIP, GSM

?E

WiFi VoIP, GSM call-trough, SMS over IP, least cost routing, Synchronisation/back-up of mobile contacts and calendar

2.0

Windows Mobile 6

Windows Mobile 6 Professional/Standard

Freeware

SIP

?E

?OC

?LR


1.0

[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)
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)

[edit] 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) 7.0 (January 2009)
AS5300 Windows Server 2003, Linux Closed SIP, UNIStim, MLPP TLS,

SRTP, SDESC

Voice and Video IP telephony, Voice and Video conferencing, voice mail and instant messaging 1,000 - 25,000 users 1.0 (Jan 2008)
Asterisk PBX Linux, BSD, Mac OS X, Solaris GPL free software/ Proprietary SIP, H.323, IAX       1.4.23, January 21, 2009

FreeSWITCH PBX SoftPhone

BSD, Linux, Mac OS X, Solaris, Windows

Open source, Mozilla Public License, Free software

SIP, STUN, XMPP, Jabber, IAX, H.323, Skype

TLS, SRTP, ZRTP

Recording, Voicemail, Jabber IM, Google Talk, Proxy, Media gateway, Soft-PBX, IVR,

Large soft-switch users, home PBX users, softphone users

1.0.3RC1 (January 31, 2009)

GNU Gatekeeper Linux, Mac OS X, Windows XP/2000, FreeBSD GPL Free software H.323
Routing, Accounting, Authorization
2.2.8, January 9, 2009
Mumble Windows, Mac OS X, Linux, and BSD (server only) GPLv2 Speex SSL 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 (25-256 users) 1.1.8 (March 22, 2009)
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)
OpenSIPS (formerly known as OpenSER) BSD, Linux, Solaris GPL free software SIP, Jabber, XMPP
SIP Registrar/Proxy, Authentication, Diameter, RADIUS, ENUM, least-cost-routing and many others. SIP Service Providers 1.4.3
pbxnsip Windows, Mac OS X, BSD, Linux Closed 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)
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 3.11, Jan 2009

[edit] See also

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