How does VoIP work? Like many people, you may have already heard of VoIP. If you weren’t born in this decade, you may still wonder what it really is. What can VoIP do for you and how exactly is it useful?
Basic Concept
VoIP stands for voice over internet protocol. These days, it is considered an alternative to the typical method of communication involving telephones. Instead of using telephone sets that transmit analog signals, VoIP converts these signals to digital chunks. These are reconverted to audio data when it reaches the recipient. The entire transmission happens over the internet. Although VoIP technology is still far from being preferred and considered standard, some people think that VoIP will eventually replace telephones. It could very well be the next step in communications technology.
The Specifics
So how does VoIP work exactly? VoIP is best understood by understanding typical phone calls first. Regular phone calls make use of what is called circuit switching. When you make a call, your call is passed through a series of switches starting from your phone carrier. Once the other party answers the call, the circuit between the two of you is opened.
Instead of circuit switching VoIP uses packet switching. In this technology, your voice is converted to little packets of data. These packets of data come with their instructions of where they should be sent. They are then sent through a variety of possible routes. They take the nearest router and are passed on to succeeding routers until they reach the recipient. When the packets are received, they are reassembled into a form that can be understood.
Advantages of VoIP
VoIP can offer all the features and benefits of a phone service. Its advantage over traditional phones is that VoIP calls can be made from almost any part of the world. Wherever there is an internet connection, you can have VoIP. The technology can provide cheaper calls than standard telephone technology. This is mainly because VoIP does away with costly circuit switching.
Disadvantages of VoIP
VoIP can be fast, convenient and cheap. It has, however its own disadvantages. These disadvantages are basically due to: (1) the current reliance of present systems on telephone technology; and (2) the shortcomings that plague computer technology.
Telephone Connections – Such services for example as security and cable still rely on telephone connections. Unless the whole country or world agrees to switch to VoIP, these services are likely to stick to their old methods.
This is not the biggest concern though. Since VoIP relies on internet technology, it is also susceptible to the problems that confront the internet and computers. You can therefore expect such problems as viral attacks, crashes and stolen packets.
Now you know the basic answer to how does VoIP work. In reality, this piece of technology does hold a lot of potential. Like everything else, the old ways of communicating over long distances can change. VoIP is the first logical shift that can be taken. It may take a long time however, before VoIP can become a fully integrated and snag free system.
By: Torrie Cantor
Posts Tagged ‘Switches’
How Does VoIP Work? Understanding The Basics
February 28th, 2010VOIP Telephony – The Benefits and Limitations
January 25th, 2010
Previously we explored the history and technology that gave
rise to VOIP Telephone service (*see footnotes). Today we will examine
some of the benefits and also the drawbacks of this new opportunity.
In previous articles we discovered that traditional “Landline” type
phone service is set up much like a “Toll Highway”. Billing starts
when the “Circuit” is opened, and continues until it is closed.
Just like travelling down a Tollway, the longer you stay on, and the
farther you travel, the more “Toll Booths” you pass through. These
toll booths are the phone company’s switches, and you get charged
for every one that you pass through.
In contrast, VOIP phones use “Packet” switching. As the broadband
Internet connection is always open, digitized voice signals are
sent to the receiver in discrete packets. The result is that no
“dead air” exists on the line, as no traffic is sent when there is
a lull or pause in the conversation. This allows several two-way
conversations to use the same “bandwidth”, or space that previously
was tied up by ONE call.
This has resulted in great economy for VOIP providers who in turn
pass along the savings to the end user. Most top VOIP plans run
around 30 dollars a month, and the best include International calls
to many countries worldwide within that base fee along with a host
of features like Voice Mail, Caller ID, Call Waiting, Three-way
Calling, Online Access, Etc.
While most major traditional carriers have an “all inclusive” plan,
none that I know of include International calling, and most of their
“basic” plans are double the cost of VOIP. In my experience, the most
coveted features are also charged extra for. Add in the taxes and fees,
and all of a sudden you’re talking REAL money!
The other great benefit of VOIP is the ability to take your device
anywhere and make calls just like you were at home. The best services
are fully find-me, follow-me capable. This means that wherever you
happen to be, your phone number will find you and ring at THAT location.
I use mine with a Laptop, a cheap cigarette lighter a/c converter,
a wireless card, and an old “princess” phone in my truck parked outside
of hotspots all the time. That’s huge. You can have your office in
whatever hotel or airport or Starbucks you happen to be in at the moment.
Having covered most of the benefits of VOIP, let’s examine some of
the drawbacks. The major one is spotty 911 service availability. As
the device is portable, any call to 911 will result in emergency
crews being sent to the device’s address of record, which is set up
when you activate the VOIP device and service. Obviously this doesn’t
do you much good if you are in a hotel in Montana but live in Ohio.
One way around this is to change your address with your provider when
you travel, and then change it back when you return home. Of course,
this only works with domestic addresses, and you must remember to do it.
A better way is to ignore the issue entirely, and keep a very basic,
cheap, no frills service plan with your local phone provider. This will
still be cheaper by far than a full blown plan. Also, you avoid the other
main issue with VOIP- Power Outages. If power goes out, or you lose your
Internet Connection, you lose your phone service. Of course, you run
that risk with today’s cordless phones too, so it’s always a good idea
to have an old hardwired phone around the house, or at least a cell
phone available.
By: Glenn Grundberg
