Skype

http://upload.wikimedia.org/wikipedia/fr/thumb/6/69/Skype_Logo.svg/612px-Skype_Logo.svg.pngSkypeSkype is proprietary software that allows users to make phone calls over the Internet. Calls from user to user are free, while those to fixed telephone lines and mobile phones are charged. Among its additional features: instant messaging, file transfer and video conferencing.Skype was founded by Niklas Zennstrom and Janus Friis in 20031. It was developed by programmers Ahti Heinle, Priit Kasesalu and Jaan Tallinn2. The three Estonians were already behind the KaZaA software. With the expansion formulas ISPs offering unlimited free phone to many destinations, the value of Skype is losing some strength. One of the original project name was Sky peer-to-peer, shortened to "Skype". But as some domain names were already associated with the term "Skype", the founders eventually decided to abandon the R final3.

HistorySince 2007, the software offers fee-based services expanding the possibilities. SkypeIn allows to be called from any landline or mobile phone without using the software, provided that the phone is in one of 25 countries desservis4. Also, some subscribers can call from his computer to a landline or mobile, for are very modiques5. If an Internet connection is usable, Skype can be substituted in almost all situations, in fixed or mobile phone.
On May 10, 2011, Microsoft announced the acquisition of Skype for $ 8.5 billion in cash, debt incluse6, 7.
On 22 August 2011, Skype announced the acquisition of U.S. company GroupM (en), specializing in communication solutions between private groups on mobiles8.
The original and free offersSkype allows free calls only between two computers or devices with Skype and connected to the Internet through a microphone and speakers or a headset or telephone connected to the computer (eg via USB). It also features basic instant messaging allows users to communicate textually and to transmit files.
Video conferencing is possible since January 2006 and the release of Skype 2.0 for Windows.
Skype has become a voice communication tools most widely used computer as well as Windows Live Messenger, although posing problems for interoperability (mutual exclusivity of the protocol and software), in addition to privacy concerns (safety by darkness, intrinsically unverifiable).
A version of Skype is also available on the PlayStation Portable since February 2008.
Telephony service Skype has also been used from mobile phone (wireless network and / or mobile) with software developed by Skype or Fring before Skype Fring makes it incompatible with his service.
Skype was released in March 23, 2009 for the iPhone and iPod touch.
It was released in December 2009 for Nokia (Symbian S60) and then in December 2010 for Android (OS 2.2) and then for the Blackberry. Initially, only subscribers to Verizon Communications American network could use Skype on their Blackberry or Android. This restriction was lifted for systems above the Android version 2.1 in October 2010 but to use the WiFi network (not GSM antennas) but never to this day for the Blackberry. You should know that the future of Microsoft operating system, Windows 7 Phone, officially work on Nokia phones, and Skype (Microsoft) has partnered with Facebook in order to counter the Apple (FaceTime) and RIM ( without support Skype, VoIP). Google only seems to provide an alternative to Skype with Android, Google Voice, and the acquisition of Motorola. For unknown reasons, the use of service software Fring Skype on mobile is no longer possible.
In some countries, the government (Egypt) or the owners of mobile phone networks forbid the use of Internet telephony is to say all the communication protocols for voice (VoIP, Skype, Jingle).
In France, following a ban by the owners, the use of telephone services based on Internet Protocol (VoIP) from a mobile wireless possible before now became possible on the mobile network after a specific subscription (offer high-end). Whatever the network, it must be compatible with VoIP (g WiFi network and telephone networks 2G).

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