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Telephone,
which was first patented in 1876 by Alexander Graham Bell and later
developed by many others, was the first device in history that
allowed people to talk directly with each other across large
distances. As Thomas Edison said, “ the invention of the telephone
brought the human family in closer touch." Telephone quickly
became integral part of businesses, government, and households, so,
today, in the 21st century, phone calls between friends and
businesses around the world are just common everyday occurrences. In
fact, telephone has changed greatly since the late 1800's when it
first became popular. The definition of telephony has expanded
greatly and today it is defined as the science of transmitting voice,
data, video, or images over a distance that is greater than one can
shout. As the telecommunications technology revolution continues to
unfold, replacement of outdated telephone service infrastructure with
VoIP is becoming popular among businesses, as it immediately enhances
the productivity of any business. Today such components of telephone
industry as IP telephony, VoIP, PBX, IP PBX are used interchangeably
by many people, but difference between these telephone systems is
distinct.
