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Telephony is a technology which allows voice and/or interactive communication between two points through the usage of appropriate equipment. Analog sound signals are translated into electrical signals after a communication request is initiated. These electrical signals are converted back to analog sound signals once received at the destination.
IP or Internet telephony is the latest terminology related to data/voice communication. It uses the Internet as a medium of communication.
IP telephony allows data communication in which voice, fax or digital information can be transmitted over the Internet. It is replacing conventional telephony and telecommunication infrastructure very rapidly because it offers the following key features: