Voice over Internet Protocol

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Voice over Internet Protocol or VoIP enables a person to make telephone calls using broadband internet instead of the usual telephone line. The most important advantage of this technique over the regular telephone service is that the charge that has to be paid is much less in VoIP…

Introduction

There is also IP telephony outsourcing services also known as IP Centrex services which is provided for enterprises by ISPs (Internet service providers or carriers). IP telephony services require interoperation of IP networks and this open nature of the IP networks open niche for its illegal uses. Nowadays these services are provided by unlicensed VoIP providers. The present paper is intended to analyze the factors leading to such illegal use of VoIP, the methods of illegal use and how this problem could be circumvented.
The principle behind VoIP is that using a computer and a microphone it is possible to record sound of a person. In this process, the sound would be sampled at a very high rate and then would be stored as files in the computer. Each of these samples is a small bit of sound by the respective person. Now the computer would be able to use these samples in such a way that a listener would be able to hear accurately what the speaker has said. In VoIP, the difference is that the recorded samples are send through IP services to another computer placed at a distant place. So the speaker's voice could be heard as such by a listener sitting at a long distance. For this purpose the computer has to compress the sound samples so that it could be hold in a limited bandwidth with limited frequency. ...
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