What is a PBX?

What is a PBX?
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A PBX (Private Branch Exchange) is a private telephony switch, allowing the owner (which may be an organization or any kind) to act like a mini-service-provider for its users, while, normally providing many additional features, such as call transfer, call-waiting, IVR (Interactive Voice Response), queues, reports and more. As the organization is the owner of the PBX, it is not being charged for internal calls (calls between extensions that are both registered on the PBX), though, based on the type of service, it may charge for such calls (such as in the case of a business center providing telephony services to the tenant-businesses).
The phone handsets in any business or other organization are almost never connected directly to the PSTN (Public Switched Telephony Network), but rather to the local PBX which provides it with dial-tone and all its features.
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What is the Difference Between PBX and IP PBX?
The ìIPî in ìIP PBXî stands for Internet Protocol, meaning that IP PBX is a type of PBX that can use computer networks for sending and receiving voice. This usage of computer networks for voice is also known as Voice over Internet Protocol, or VoIP.
In the past, phone handsets and lines were either analog or digital, but in recent years all telephony implementations use IP phones (VoIP-based phones) besides very specific use cases where analog or digital phones are still required. One such example may be with existing analog infrastructure, such as with a hotel looking to renew its phone system, but does not want to go into the investment of rewiring the rooms to support IP phones.
An example IP PBX system with IP Phones
As for analog and digital trunks (lines), the use of those is still more common in some cases, for various reasons, such as infrastructure and regulation.
Working over internet protocol allows the IP PBX to utilize computer networks, including the internet, to make calls. This opens options such as having remote extensions (IP phones that are not physically on the same network as the IP PBX) and ìsoftphonesî ñ software-only IP phones that may run as an application on a mobile device, laptop or desktop computers. Such softphones will benefit from all the IP PBX features, while not requiring any dedicated hardware.

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