The internet has begun as a communication network to satisfy the collaboration requirement of the government, universities and corporate researches. Untill recently,the internet has been optimised for efficient data communication between computers.This immense success of data transmission over the packet switched network has led to the idea of transmitting voice over the internet. The yerm INTERNET TELEPHONY has evolved to infer a range of different services. In general, it refers to the transport of real-time media such as voice and video over the internet to provide interactive communication among the internet users.
The parties involved mah access the internet through a PC which is internet enabled or even by dialing up to a gateway from the handset of traditional Publiv Switched Telephone Network(PSTIN).it introduces entirely new and enhanced way of communication.
IP telephony involves the use of the internet to transmit real-time voice from one PC to another PC or a telephone. The technology involves digutisation of speech and splitting it into data packets that are transmitted over the internet. The compressed data is then re-assembled at the receiving end. This differs from the conventional Public Switchrd Telephone Network(PSTN),since the communication and transmission are performed across IP networks as against conventional switched networks.
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