The company (PBX) would then check which desktop phone the called number was assigned to, and make that phone ring. When the phone company received an incoming call to a company, it would first signal to the company on-premise switch (PBX) which phone number the incoming call was for – before starting to ring. It also negated the need for outside callers to first be connected to an operator at the company, or to an auto attendant, before being connected onwards to the person they wanted to call.Ī company with 150 employees – all with their dedicated desktop phone and phone number – could thereby share 30 incoming phone lines/channels. The phone lines could instead be used as a shared resource for all incoming and outgoing calls from the office. This negated the need for the company to buy an expensive phone line for each employee. Instead of having a dedicated phone line from the phone company for each phone number, the company would instead just buy as many phone lines as they needed for the max amount of concurrent calls. The company telephone switch (PBX) was connected to the outside world and the classical phone network (PSTN) via digital or analogue phone lines. In later versions, the PBX would instead use the regular computer network (LAN) to connect calls to the desktop phones. Each phone was wired with copper cables to a central on-premise phone switch (also known as a PBX or “Private Branch Exchange”). In the old classical work set-up, office workers had their own physical desktop phone.Įach phone had an internal phone number (extension number) enabling internal calls between employees at the same office. We will also go through how you can get a DID number that is free forever. In this article we will explain the old and current definition of DID numbers. Today, “DID numbers” has become a term that refers to any phone numbers that can be purchased online. The term was originally used to describe how phone numbers could be used to connect calls to your personal desktop phone via an on-premise company phone switch (PBX). DID (Direct Inward Dialing) numbers are regular phone numbers.
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