What is voip?
VoIP (Voice over Internet Protocol) is simply the transmission of voice traffic over IP-based networks.
The Internet Protocol(IP) was originally designed for data networking. The success of IP in becoming a world standard for data networking has led to its adaption to voice networking.
How voip work?
VoIP converts the voice signal from your telephone into a digital signal that travels over the Internet. If you are calling a regular phone number, the signal is then converted back at the other end. VoIP can allow you to make a call directly from a computer, a special VoIP phone, or a traditional phone using an adapter. In addition, new wireless "hot spots" in public locations such as airports, parks, and cafes, allow you to connect to the Internet, and may enable you to use VoIP service wirelessly. If you make a call using a phone with an adapter, you'll be able to dial just as you always have, and the service provider may also provide a dial tone. If your service assigns you a regular phone number, then a person can call you from his or her regular phone without using special equipment.
Voip
If you've never heard of VoIP, get ready to change the way you think about long-distance phone calls. VoIP, or Voice over Internet Protocol, is a method for taking analog audio signals, like the kind you hear when you talk on the phone, and turning them into digital datathat can be transmitted over the Internet.
Voip Use
How is this useful? VoIP can turn a standard Internet connection into a way to place free phone calls. The practical upshot of this is that by using some of the free VoIP software that is available to make Internet phone calls, you are bypassing the phone company (and its charges) entirely.
Virtual Private Network
Ein Virtual Private Network (VPN) (dt.: Virtuelles Privates Netz) ist ein Computernetz, das zum Transport privaterDaten ein öffentlichesNetz (zum Beispiel das Internet) nutzt. Teilnehmer eines VPN können Daten wie in einem internen LANaustauschen. Die einzelnen Teilnehmer selbst müssen hierzu nicht direkt verbunden sein. Die Verbindung über das öffentliche Netz wird üblicherweise verschlüsselt. Der Begriff „Private“ impliziert jedoch nicht, wie vielfach angenommen, dass es sich um eine verschlüsselte Übertragung handelt. Eine Verbindung der Netze wird über einen Tunnelzwischen VPN-Client und VPN-Server (Concentrator) ermöglicht. Meist wird der Tunnel dabei gesichert, aber auch ein ungesicherter Klartexttunnel ist ein VPN.
IP-VPNs nutzen das Internet zum Transport von IP-Paketen unabhängig vom Übertragungsnetz, was im Gegensatz zum direkten Remote-Zugriff auf ein internes Netz (direkte Einwahl beispielsweise über ISDN, GSM, ...) wesentlich flexibler und kostengünstiger ist.
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