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Skype
Skype is a free of charge available VoIP software which makes possible making a telephone call free of charge via Internet of PC to PC as well as making a telephone call chargeably into the fixed network and on mobile telephones. Conference link-ups are possible for up to five conversation participants.
Since version 1.2 of the Windows variant Skype also offers an answering machine as well as the service SkypeIn with costs. A fixed network number about which he is obtainable via Skype is assigned to the user at SkypeIn. Besides making a telephone call main use of Skype is the Instant Messaging in which chats are also possible with several participants as well as the transfer files.
The software stands out by the fact unlike many comparable programs that it works without problems also behind firewalls and NAT routers because among other things TCP port 80 which usually finds use for the surfing in the World Wide Web is used for the communication. The language quality of Skype is for the most part better than during conventional telephone calls because of new compression algorithms and at connections of PC to PC the encoding with ae 256 provides the privacy according to the Skype. Since Skypes VoIP protocol is proprietary, Skype users on the soft and hardware who were authorized by the manufacturer are dependent unlike users of services which use SIP.
The structure of Skype is partly decentralized in the context of a P2P net, for example the phone book. The authentication and cashing up are, however, carried out via a central computer. Connections of PC to PC as well are partly passed on via other Skype participants while the conversations are dealt with into the fixed network over computers provided for it especially.
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