Understanding office PBX and how it works

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Office PBX (office automatic telephone exchange and institutional PBX) is intended for use within the organization. From the automatic telephone system used by the telecommunications operator, in the first place, it differs in the orientation towards a small number of serviced numbers (usually less than one hundred or two hundred), separation of the telephone network into “internal” and “external” ones.

Depending on the type, it can receive digital streams, analog lines or dial-up networks (IP telephony) from telephone operators. Subscriber devices are usually analog phones, digital or IP telephones. The use of the PBX allows you to refuse the connection of each subscriber device (telephone, modem, fax) of the organization to the public telephone network, which would result in the allocation to each subscriber device of a separate line (usually paid monthly), and all “internal” calls would pass through the automatic telephone exchange operator of communication.

PBX equipment like what’s offered by Yealink Dect Cordless Phones is usually installed in the premises of the organization and switches calls between internal subscriber lines. Additionally, a limited number of trunks to the public telephone network are usually available for external incoming and outgoing calls. Organizations located in several buildings can use trunks to connect their own PBXs. The connection lines are usually analog. The latter, in contrast to analog, are able to handle more than one connection and receive calls to several city numbers.

The main difference between a professional PBX and a public telephone exchange is:

– the ability to provide fully accessible traffic switching schemes (communication without locks);
– intelligent call distribution systems for subscribers or operators;
– the huge volume of subscriber services provided (for example, Avaya PBX provides over 800 telephone services);
– it supports for embedded CRM subsystems and advanced SDK systems for embedding telephone subscriber service in automated systems.