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What
is IP PHone ?
Voice over IP is exactly what
its name suggests. It is voice communication that is
transmitted over an Internet Protocol (IP) service.
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VoIP is seen as a disruptive technology. For a century,
people have been happy to use the plain old telephone
system (POTS) to make calls.
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When POTS calls are made, a circuit opens between the
two callers. No matter how long they speak, or whether
there are quiet periods in the
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conversation, that circuit remains open between the
caller and receiver. Importantly, the further a caller
is from a receiver, the dearer the call
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cost because telcos must lease a longer line for that
call to take place.
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VoIP changes this model. Now a call, just like an audio
file or image file, can be broken up into packets of
data and sent over an IP network.
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The catch with this is packets might not always travel
the same path to get to their intended destination.
So the continual challenge for a
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VoIP service provider is that these packets arrive quickly
and as one voice stream when they get to the other end.
Any hiccups along this
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path and your conversation literally makes no sense.
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To get
VoIP in your home or office all you need
is a Broadband connection to the Internet,
a subscription to a VoIP service provider
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client -- an analog telephone adaptor
(ATA), IP Phone or "soft phone".
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How
does a VoIP call work?
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So how does VoIP work? VoIP is largely
dependent on a
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protocol called SIP (Session Initiation
Protocol). The idea behind SIP is to provide
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a simple, lightweight means for creating
and ending connections for real-time interactive
communications over IP networks -- mainly
for
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voice, but also for videoconferencing,
chat, gaming or even application sharing.
In other words, the protocol initiates
call setup, routing,
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Here
is a list of the best voice over IP phone telephone
internet telephony services over the world.
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