What is more complex and difficult to achieve is PC-to-phone Internet telephony. This
involves using your PC to make a call to any regular phone number! It is
difficult because when you make a call from a PC to a regular telephone, the
company that operates the telephone connection has to pick up your voice
from the Internet and carry it over the regular phone network. Then it has
to carry its subscriber's voice back to the PC caller in such a way that it
can travel across the Internet.
Conventional telephones use circuit
switching technology creating a direct link with the two sites participating
in a communication. In VOIP, packet switching is used. Packet switching
is a communications paradigm in which packets (messages or fragments of
messages) are individually routed between nodes, with no previously
established communication path. In fact packet switching is the basis for
TCP/IP communication which is the basis for Internets working.
Skype the
sensation!
Amongst
the options available skype which is made
by the kazaa sponsors deserves special
mention. Skype's programs lets you call Internet connected PCs free of
charge and other phone for a charge. Currently millions of users are said to
be using their both free and paid service.
