Skype lets you make free calls over the internet to anyone else who also has Skype. It's free and easy to download and use, and it works with most computers. Skype offers free global telephony and unlimited voice calls with its next-generation peer-to-peer software.
Users may call landlines and cellphones for a fee; users may call each other for free.
Skype makes your computer (or PocketPC) works as your phone.
Skype users now are near to 272 million people worldwide..
Skype works on a decentralized model, meaning there are no big phone switches and controlling computers in regional data centers, such as those that power Vonage and other broadband phone service providers. The only centralized Skype services at the beginning were the login servers, which also show which other Skype users are online. The switches that followed control SkypeOut calls to traditional telephone networks around the world. Adding Skype Voicemail and SkypeIn requires more centralized resources, and Skype data centers are growing as you read this. But Skype's low infrastructure cost per number of subscribers creates jealousy among every other broadband phone service provider.
Other internet telephony services, such as Vonage, Verizon, Packet8, ATT CallVantage, and others, spend hundreds of dollars of marketing and advertising money to find each new customer. Skype spends nothing [$0] except for the server support to keep its download files available.. Users worldwide join Skype by a word of mouth..
Skype transmits the full frequency range of human hearing (20Hz to 20KHz). Compare this with the standard phone frequency of 300Hz to 3.4KHz and you can see why Skype calls sound so wonderful.
The hassle could be your computer must be turned on to use Skype, and people you call must have Skype running on their system in order to receive your call.
-- Every Skype connection uses 256-bit encryption
-- Call quality astounds people
-- Talking free to other Skype users
-- Conference call with up to 5 total Skype users
-- File transfers
-- Chat (instant messaging)
-- SkypeOut [The ability to call regular phones]
-- SkypeIn [The ability of regular phones to call you on Skype]
-- Skype Voicemail
-- Skype Video Calling
Skype may not take over the world. However, Skype makes the world's highest-quality phone connections available for the world's lowest price: free.
The main difference between Skype and other VoIP clients is that it operates on a peer-to-peer model rather than the more traditional server-client model. The Skype user directory is entirely decentralised and distributed among the nodes in the network, which means the network can scale very easily to large sizes (currently just over 70 million users) without a complex and costly centralised infrastructure.
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For now, Skype looks so wonderful, but to me and other developers, it still needs alot of criticism for security.. specially in large scale use like researches and large companies..
Security in Skype has alot of red marks which will be discussed in the next part..