Thursday, 21 August 2014

Skype

                                Skype

Skype Is One of the World's Best voice and Video Calling Service.
Skype /ˈskp/ is a freemium voice-over-IP service and instant messaging client, currently developed by theMicrosoft Skype Division. The name was derived from "sky" and "peer".[17]
Skype was first released in August 2003. It was created by Janus Friis (Denmark) and Niklas Zennström(Sweden) in cooperation with Ahti HeinlaPriit Kasesalu, and Jaan Tallinn (Estonia), who supplied the backend which was also used in Kazaa.[18] Skype had 725 million registered users at the end of 2011.[19] It was bought byMicrosoft in 2011 for $8.5 billion. Microsoft's Skype division headquarters is in Luxembourg, but most of the development team and 44% of the overall employees of the division are still situated in Tallinn and Tartu,Estonia.[20][21][22]
The service allows users to communicate with peers by voice using a microphone, video by using a webcam, andinstant messaging over the Internet. Phone calls may be placed to recipients on the traditional telephone networks. Calls to other users within the Skype service are free of charge, while calls to landline telephones andmobile phones are charged via a debit-based user account system. Skype has also become popular for its additional features, including file transfer, and videoconferencing. Competitors include SIP and H.323-based services, such as Linphone[23] and Google Hangouts.
Unlike most other VoIP services, Skype is a hybrid peer-to-peer and client–server system. It makes use ofbackground processing on computers running Skype software, and this is reflected in Skype's original proposed name of Sky Peer-to-Peer. Skype clients are also available for smartphones running on Android, iOS andBlackBerry 10 operating systems.
Silver Lake, Andreessen Horowitz and the Canada Pension Plan Investment Board announced the acquisition of 65% of Skype for $1.9 billion from E-Bay, valuing the business at $2.75 billion. In May 2011, Microsoft agreed to acquire Skype for $8.5 billion in cash.
Some network administrators have banned Skype on corporate, government, home and education networks,[24]citing reasons such as inappropriate usage of resources, excessive bandwidth usage, and security concerns.[25]
Registered users of Skype are identified by a unique Skype Name, and may be listed in the Skype directory.[34] Skype allows these registered users to communicate through both instant messaging and voice chat. Voice chat allows telephone calls between pairs of users and conference calling, and uses a proprietary audiocodec. Skype's text chat client allows group chats, emoticons, storing chat history and editing of previous messages. Offline messages were implemented in a beta of version 5, but removed after a few weeks without notification. The usual features familiar to instant messaging users—user profiles, online status indicators, and so on—are also included.
The Online Number, a.k.a. SkypeIn, service allows Skype users to receive calls on their computers dialed by conventional phone subscribers to a local Skype phone number; local numbers are available for AustraliaBelgiumBrazilChileColombiaDenmark, the Dominican RepublicEstoniaFinlandFranceGermanyHong KongHungaryIrelandJapanMexicoNepalNew ZealandPolandRomaniaSouth AfricaSouth KoreaSwedenSwitzerlandTurkey, the Netherlands, the United Kingdom, and the United States.[35][36] 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. The countries on this growing list are referred to collectively as the SkypeIn Countries.
Skype supports conference calls, video chats and screen sharing between 25 people at a time for free.[37][38]
Skype does not provide the ability to call emergency numbers such as 112 in Europe911 in North America000 in Australia100 Call Police in India and Nepal.[39]The U.S. Federal Communications Commission (FCC) has ruled that, for the purposes of section 255 of the Telecommunications Act, Skype is not an "interconnected VoIP provider".[40] As a result, the U.S. National Emergency Number Association recommends that all VoIP users have an analog line available as a backup.[41]
On 14 July 2011, Skype partnered with Comcast to bring its video chat service to Comcast subscribers via their HDTV sets.[42]
On 17 June 2013, Skype released a free video messaging service which can be operated on Windows and Mac OS, iOS, Android and BlackBerry.[43]
On 12 August 2013, Skype released the 4.10 update to the app for Apple iPhone and iPad that allows HD quality video for iPhone 5 and fourth generation iPads.[44]

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