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An Introduction to
Telephony and Asterisk
Telephone, n. An invention of the devil which abrogates some of the advantages of
making a disagreeable person keep his distance.??”Ambrose Bierce.
What is a telephone? While Ambrose Bierce refers to it as an invention of the devil,
for most of us a telephone is nothing more than a communication device. For some
a telephone is a complex electronic device they cannot live without (have you ever
seen a stock broker work?), while for others, it is simply an innovative piece of
equipment in their office or home. Telephones exist in many shapes and sizes, but
one thing unites them all??”their functionality. Be it the most complex phone in the
world or the silliest kiddy phone, they essentially enable us to communicate with
other people.
Unlike other technologies, telephony is considered highly simplistic from the user's
point of view. This chapter imparts the basic knowledge necessary to start your
journey into the world of telephony. By the end of this chapter, you will
have learned:
The basics of telephony??”The Central Office Exchange (COX) and the Private
Branch Exchange (PBX).
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