VOIP TELEPHONE SYSTEM
VOIP is a voice transfer technology over the Internet. With high-quality internet connection, Internet calls can save you a lot of money. VOIP technology digitizes and transmits the voice over the Internet, then transforms it into voice again.
VoIP servers are equipped with powerful sound processors designed to digitize the sound. They take care of echo cancellations and compensate for signal delay.
The first technology of Internet telephony was introduced in February 1995 by VocalTec. The internet phone is very very simple compared to today's technology. The software is originally create to work on a 486-bit PC with a 33 MHz processor or higher through which the user will talk to another user using the computer modem, sound card (speaker and microphone). In the transfer process, the software transforms (compresses) the voice that is spoken in the microphone. The compressed voice is then transported via IP packets as data in a standard internet session format. With this technology, however, the conversation is restricted to only two computer users (computer to computer).
A year later, in March 1996, VocalTec announced that they will start working with other hardware vendors called Voice Gateway to allow audio connections between an Internet phone and a PSTN phone. However, the challenge how to address and reach a user on a computer, located anywhere in the world, remains. To do this, the user must know the IP address of the remote computer, which is not easy to find unless there was a previous contact with it. The Voice Gateway looks for another one which has the phone number of the user you are looking for. It's easier to find a phone number than an IP address. Thus, the functionality of Voice Gateway handels both - connecting the network and addressing.