PBX Full Form | Full Form of PBX




PBX Full Form - Private Branch Exchange

 Private Branch Exchange

Private Branch Exchange

  • PBX stands for Private Branch Exchange.
  • It refers to a telephone switching system of an enterprise. It's used to switch calls between VoIP (voice over Internet Protocol or IP ) users on local lines to facilitate internal communication of a business.
  • Its main function is to permit in-house calling between extensions and to permit routing for outdoor calls. For example, when an employee makes a call to a different employee on a same network, the call is routed through the PBX without requiring an outdoor line.
  • He also can make a call outside the company network through an equivalent exchange.
  • PBX allows companies save costs and increases its efficiency, e.g. If a company doesn’t use a PBX, it'd got to install 500 separate lines if it's 500 employees.
  • PBX is owned and managed by the company; The phone exchange doesn't control it.
  • Earlier, PBX was based on analogue technology, but today, it uses digital technology.
 Public Switched Telephone Network

Public Switched Telephone Network

Parts of a PBX

  • PBX mainly comprises lines and stations. The lines are connections to the PSTN and Stations are endpoints like fax machines, desk phones, MasterCard terminals, etc. The essential parts of a PBX are as follows:
    • Exchange : It's an oversized switching station that connects and route calls internally or externally. It's the main a part of the PBX system.
    • Gateway : It connects the interior network to the surface world. It routes calls from the exchange unit to the local Public Switched Telephone Network (PTSN) lines. For example, when someone dials an outdoor line, the gateway connects the interior extension to the surface line to finish the decision.
    • Handsets : The handsets used with PBX systems are given various special functions. They permit users to dial inside extensions, hook up with outside calls, and use intercom and other features provided within the given system.

Features of PBX

  • The equipment needed depends on the complexity and use of the PBX -- as an example, the kinds of phones used at a specific site. In general:
    • Network of lines within the PBX
    • Unified communications (UC) router -- wireless and wired
    • VoIP gateway
    • IP PBX
    • Internet router
    • Cables, cabinets, uninterruptible power supply ( UPS )
    • Telephony application server.
  • A PBX call centre handles inbound and outbound calls and incorporates features to enable the automated handling of inbound calls.
  • These features include Interactive Voice Response (IVR); call monitoring to assist assess employee productivity and supply training; conferencing capabilities; phone features that help agents answer and make calls from their desktops; integration to customer relationship management (CRM) systems that help capture logistics and convey up customer information to agents; and predictive dialer systems.
  • In some situations, alternatives to a PBX include a headquarters exchange (Centrex) service during which a pool of lines are rented at the phone company's headquarters , key telephone systems and, for little enterprises, primary rate Integrated Services Digital Network (ISDN).


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