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How PBX Works

How PBX Works

 

The Functions of a PBX

A PBX (Private Branch Exchange) is a switch station for telephone systems. It consists mainly of several branches of telephone systems and it switches connections to and from them, thereby linking phone lines.

Companies use a PBX for connecting all their internal phones to an external line. This way, they can lease only one line and have many people using it, with each one having a phone at the desk with different number. The number is not in the same format as a phone number though, as it depends on the internal numbering. Inside a PBX, you only need to dial three-digit or four-digit numbers to make a call to another phone in the network. We often refer to this number as an extension. A person calling from the outside might ask for an extension to be directed to the person she is targeting.

The picture below illustrates how a PBX works.



 

The main technical roles of a PBX are:

         -To switch between telephone users thereby creating connections

         -To make sure the connection remains in place properly by keeping its resources

         -To properly end the connection when a user hangs up

         -To record the quantities, statistics and metering related to the calls

Practically, the functions of a PBX are the following:

         -Provide one single number that external callers can use to access all persons in a company.

         -Distribute calls to employees in a answering team in an even way; using the Automatic Call Distribution (ACD) feature.

         -Automate call answering, but offering a menu of options from which a user can select to be directed to a specific extension
      or department.

         -Allow the use of customized business greetings while answering calls.

         -Provide system call management features.

         -Place external callers on hold while waiting for a requested person to answer, and playing music or customized commercial
       messages for the caller waiting.

         -Record voice messages for any extension from an external caller.

          -Transfer calls between internal extensions

 
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