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Internet Telephone Calls - VoIP Basics

Youve seen the commercials and read the news advertisements for telephone service using your computer: very cheap monthly fees; make all the calls you want; keep your telephone number forever; and voice quality as good as a landline. Youve heard the claims and youve heard the term VoIP. Heres the scoop.

VoIP stands for Voice over Internet Protocol and it does what the name suggests - it transmits voice data using IP packets over the Internet. It is also called Internet Telephony. Its easier to understand VoIP if you know a little about our telephone system - PSTN (the Public Switched Telephone Network) and a little about the Internet.

Your traditional land line transmits calls through copper or fiber cables in the ground or on telephone poles with a cable connected to your home. When someone makes a call, one continuous route is made between the two phones and the information flows continuously in this loop. As you know from paying your bills, the longer the route, the more expensive the call.

Voice over IP works a little differently. It works using the Internet, which is a packet-based network. Packet-based just means that instead of sending one continuous string of information, it sends out smaller packets of information.

With Voice over IP, your voice is converted into a digital signal that travels over the Internet. There are three ways that this can be done: 1) using a VoIP telephone; 2) using a computer with speakers and a microphone; or 3) using a regular telephone with a VoIP adapter. Because the IP packets are tiny by comparison, unlike downloading files, this all happens in real time, just like your regular phone.

Because the service is provided through the Internet, once you have the equipment in place there are a number of benefits.

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