Understanding How PBX Telephone System Works

PBX stands for Private Branch Exchange. PBX telephone systems have been around for many years and they are the most popular system for large businesses and corporations. This system uses a private telephone switches which provides the people inside the facility with a cheap and convenient way to communicate. These systems are also able to access external telephone lines, so normal calls can be made as well.

Incoming PBX Calls from Traditional Telephone Systems

The PBX systems can accept calls from public telephone networks. The system uses a private switching system which routes the call to the private network and to a private number.

Outgoing PBX Calls from Traditional Telephone Systems

The internal telephones used on the PBX network enter a code (9 in most cases) in order to gain access to the outside line. When the private line is connected to the outside telephone network, the caller just has to dial the number.

PBX Calls through private telephones

Connecting private telephones on the private PBX system isn’t much different from connecting private lines which use a public switched network. The only difference is that these calls go through internal, private telephone lines.

 PBX Technology

Traditional PBX systems are actually an improvement of an old technology – the operators which used plug boards. The PBX system is automated and the calls are automatically switches between circuits. Old-time operators had to manually switch each call with a patch cable. The modern PBX system uses a small switch to reroute the analog signal. At first, PBX systems used an analog technology which greatly reduced the number of supported telephone lines. Nowadays, these switches are replaced with digital ones and PBX systems can simultaneously connect to more internal and external telephone lines.


The future of the PBX systems seems to be hidden in the VoIP networks. The IP-PBX systems take advantage of this modern technology and they are capable of rerouting phone conversations to the right handset via the Internet and digital technology. IP-PBX systems are much cheaper than ordinary PBXs and they are easier to configure, so it is certain that they are the future of PBX systems. telephones. This system also supports software-based telephones which allow users to use a computer as a virtual telephone. One of the biggest advantages of the IP-PBX is the capability to perform international calls over the Internet, therefore greatly reducing long-distance charges.

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