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d8glbnjd84
Posted: Fri 10:29, 15 Apr 2011
Post subject: VOIP services
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Nokia 2220 Slide vs Samsung E1130 – tough competitors
VoIP stands for Voice over Internet Protocol,
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, and how VoIP works is actually quite revolutionary because it streamlines the process of sending analog audio signals by converting them to a much easier to send digital form for transmission. One major advantage of VoIP and Internet telephony is that it avoids the tolls charged by ordinary telephone services that use the standard public switched telephone network. With VoIP you can make calls from any computer, which is connected to the Internet from anywhere. Similarly,
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, if you are traveling, you can use your IP phone or adaptor to make calls from wherever you are. The Computer-to-Phone service enables you to use your computer to call any landline phone. Depending on the service, one way to place a VoIP call is to pick up your phone and dial the number, using an adaptor that connects to your existing high-speed Internet connection. The call goes through your local telephone company to Voip providers. To use this service, you need a computer with a sound card,
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, a microphone and speakers or headphones. Most VoIP uses a transport layer called User Datagram Protocol (UDP) which is faster than TCP. A commonly used application layer is called Real-time Transmission Protocol (RTP) - originally developed for delivering audio and video over the Internet. An IP address can be static or dynamic. A static address always stays the same, but the majority of IP addresses nowadays are dynamic
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