PBX is a telephone system within an enterprise that
connects telephone extensions of a company to outside
public telephone network while allowing all users to
share a specific number of external telephone lines.
Initially, Private branch exchanges were using analog
technology but now PBX use digital technology.
VoIP is an industry acronym which stands for (Voice over
Internet Protocol), is an IP telephony term that enables
the users to use the Internet as the transmission medium
for telephone calls .It allows sending voice data in
digital form using IP rather than by traditional circuit
transmissions of the PSTN.
But due to advancement in technology and widening
availability of internet connections VOIP has become a
popular telephone option for homes and companies
now. But in the past PBX was only the main source of
business communication using complex types of
traditional circuit transmissions.
The main advantage of VoIP is cost; it saves money both for the
starting set up and for monthly charges. It does not require large
number of expensive phone lines installation. It simply works
with traditional telephone and have a lesser expensive
installation process requires. It requires only online sign up and
small amount for setup and phone adapters to activate the
service. Calls are almost free, with a low or fixed monthly
charge. While a PBX system consists of a huge number of
electronic equipment and large amount is required to purchase
the equipment and that to on monthly charges. Hence, low cost is
the main reason for companies to adopt VoIP systems.
Mostly PBX offers many of the same advantage as VOIP and usual
land based phone services like call waiting, forwarding, caller ID
but it is little expensive.
PBX is a system that allows you to have several
connected lines using a main land line based phone
service while VoIP takes it through the internet.
With VoIP , you can add telephone contact no.
according to the bandwidth of internet connection. If
the capacity exceeds then call quality suffers. But in
case of PBX, extra amount need to pay to add more
A main disadvantage of a VoIP system is its totally
dependent on the internet. If power cut off or internet
failure occurs, company is left without any phone
service. While PBX telephone lines does not face this
problem because it gets power through the telephone
wire and regularly function even during power cut off.
Hence when the VoIP service is down, many
organizations keep at least one traditional phone so
they can make critical calls.
The voice quality or excellence of VoIP calls totally depends on
the quality of the broadband Internet connection. If you live in an
urban area and have a high-capacity connection with high
bandwidth, your call quality will be alike to that for calls made
with traditional land lines. But if the Internet connection doesn’t
have high-capacity connection or blockage exists anywhere else
on the Internet, call quality weakens.
The main reason VOIP wins when we compare both is the fact
that, with VOIP all of the equipment and maintenance is directly
carried on the VOIP processor. While with PBX systems the
customers need to buy all the electronic equipment necessary for
VOIP is largely the best alternative for personnel use and small
businesses while PBX offers a greater variety of advantages
when it comes to medium or large businesses.
Thus, when you differentiate between VOIP and PBX,
Remember both are valuable services and have their
own advantages and drawbacks, which are evaluated
according to your basic telecommunication needs.
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