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  1. 1. Introduction:Skype is a proprietary voice-over-InternetProtocol service and software applicationoriginally created by Niklas Zennström and JanusFriis in 2003, and owned by Microsoft since 2011. Niklas Zennström Janus FriisThe service allows users to communicate withpeers by voice, video, and instant messaging overthe Internet. Phone calls may be placed torecipients on the traditional telephone networks.Calls to other users within the Skype service arefree of charge, while calls to landline telephonesand mobile phones are charged via a debit-baseduser account system.Skype has also become popular for its additionalfeatures, including file transfer, andvideoconferencing. Competitors include SIP andH.323-based services, such as Empathy,Linphone, Ekiga as well as theGoogle Talkservice.
  2. 2. Security & Privacy:Skype is claimed to be a secure communication;encryption cannot be disabled, and is invisible to theuser. Skype reportedly uses publicly-documented,widely trusted encryption techniques: RSA for keynegotiation and the Advanced Encryption Standard toencrypt conversations.The companys Policy includes: 1. Usernames are unique. 2. Callers must present a username and password or other authentication credential. 3. Each caller provides the other with proof of identity and privileges whenever a session is established. Each verifies the other’s proof before the session is allowed to carry messages. 4. Messages transmitted are encrypted from caller to caller. No intermediate node (router) has access to the meaning of these messages.
  3. 3. System & Software:Protocol:Skype uses a proprietary Internet telephony (VoIP) network calledthe Skype protocol. The protocol has not been made publiclyavailable by Skype and official applications using the protocol areclosed-source. Part of the Skype technology relies on the GlobalIndex P2P protocol belonging to the Joltid Ltd. corporation. The maindifference between Skype and standard VoIP clients is that Skypeoperates on a peer-to-peer model, rather than the more usual client–server model.Audio codecs:G.729 and SVOPC. Skype added a Skype-created codec calledSILK to Skype 4.0 for Windows and other Skype clients. SILK isintended to be "lightweight and embeddable".Video codecsVP7 is used for versions prior to Skype 5.5As of version 5.7 VP8 is used for both group and one on onestandard definition video chat and H264 is used for 720p and 1080phigh definition group and one on one video chat.ClientClients are available for Microsoft Windows (2000, XP, Vista, 7,Mobile), iOS (iPad, iPhone, iPod Touch), Mac OS X (Intel, PPC),Symbian S60, Sony PlayStation Portable (PSP), Linux (includesAndroid, Maemo), and for 2010 TV models from LG, Panasonic, andSamsung, but these TVs need a special webcam
  4. 4. The Benefit of Using SkypeFree Computer-to-Computer calls-using a computer or via mobile application
  5. 5. Calling and Texting Phones-This comes especially in handy if youretraveling without a working cell phone: simplyfind a Wi-Fi connection, connect your phone toit, launch the Skype application and make calls.
  6. 6. Skype Online number and Voice MailThe Benefit of Using Skype-you can purchase a number which allows friends andfamily to call you at local rates as if you were using aphone, only youll answer with Skype. Skype alsooffers a voice mail service
  7. 7. Group Calling video-Catch up face-to-face with more people at thesame time on a group video call with Skype.Whether you’re kicking off a project or showingoff the latest addition to the family, it’s the nextbest thing to being there.
  8. 8. Skype Internet Access-allows you to use Skype credit to pay for access toBoingo Internet hotspots, which you can find incoffee shops, bookstores and even airports aroundthe world.
  9. 9. Video : The example of skype user.T