When PBXs were originally developed, wireline phone calls were the only type of electronic communication available. Outside connectivity is now available over the Internet in the form of SIP trunks or other VoIP services. Basic analog and proprietary digital phones are giving way to standards-based IP phones. Adjunct technologies like automated attendant, voice messaging, call queuing and multi-party conferencing have become standard features. Today, a business phone system is much more than just a simple switch. Adjunct systems were added for voice messaging, call queuing and other value added services. Additional features were added to automatically route incoming calls, to allow active calls to be transferred between stations and to permit or deny calls based on various rules. Over time, operators were replaced by electromechanical and later electronic systems for managing access to lines. Frequently these early systems were simply called “switchboards”.
When someone inside needed to make a call, the operator connected them with an available line. When a call came it was answered by an operator who then connected it with the appropriate person or department. Rather than having a separate phone line for each phone, a business could share a small pool of lines across a much larger pool of stations. The original mission of the PBX was to provide shared access to limited resources. Stations are simply telephones or other endpoint devices like fax machines, modems and credit card terminals. The lines, sometimes called trunks, are connections to the global public switched telephony network (PSTN) by way of a telephone company. The initials PBX stand for Private Branch Exchange, a very old fashioned term for a system that has evolved significantly over the past century.Ī traditional PBX is made up of two key elements: lines and stations. IP PBX systems handle internal traffic between stations and act as the gatekeeper to the outside world. A higher level of availability can be achieved, when calls are automatically transferred to the location that is open or available.Also known as a PBX, Unified Communications System or business phone system, a PBX acts as the central switching system for phone calls within a business. The connection makes call queues possible that can automatically forward a call, depending on location, time or language.
This is not just a further reduction of cost, the caller also appears to be local which can have a positive influence on the conversation. The function of “Remote Breakout” allows a caller from one location to use the connection to another PBX to call into that local landline. If a colleague is unavailable, the BLF will signal his absence. Interconnection of phone systems does not just connect hard- and software, it connects people: staff moves closer together which in turn ensures a smooth flow of communication. Phone calls via Internet make it possible for employees to exchange calls easily without adding cost to the company’s phone bill.
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Firstly, interconnecting phone systems will safe significant costs, as internal phone calls are completely free – even if the locations are on different continents.
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