Internet Telephony

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Man's yearning to communicate using wires could be dated back to when Alexander Graham Bell invented the telephone. "Mr. Watson, come here, I want you" with these historic words Mr. Bell called his assistant Thomas Watson over the so-called 'telephone' and a revolution was born…

Introduction

History of 'Voice over Internet Protocol' (VoIP) can be dated back to 1973, when the Advanced Research Projects Agency Network (ARPAnet), the predecessor of today's 'Global Internet', used 'Packet Switching' for voice communication. By the late 1990s it evolved into a standard telephone hooked up to an internet connection. Today, with the introduction of 'Broadband Internet' and improvement in 'Quality of Service', traditional phone lines are slowly being phased out as businesses and households around the world embrace the benefits and features that VoIP technology has to offer.
In existing telephone systems, which use 'circuit switching', when a call is made between two parties, the 'connection' between them is maintained for the duration of the call. This is the basic foundation of the Public Switched Telephone Network (PSTN). Earlier, every call had to have a dedicated wire stretching from one end to the other for the duration of the call. So, if suppose you wanted to call from Washington DC to San Francisco, you actually owned a cable that long for the duration of the call. Later, with digitalization, your voice along with thousands of others was combined onto a single fiber optic cable for most of the distance, yet there was a dedicated copper wire going through each house. "For more than a hundred years, the PSTN was the only bearer network available for telephony." (PSTN, par.5)
In VoIP, you do not maintain ...
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