Working of Telephone system

Suppose, Someone is making a phone call to you than how it is reach to you? It is through the PSTN and each central office will make a routing decision based on some routing protocols. It is similar to forwarding in routers on internet. Now, This phone call reaches to your local central office and it routes the call to your PBX using one of trunk line you have. PBX will deliver this call to your local phone network (it is depends on how PBX is configured and which phone call is to deliver to which device or devices in local telephone network).

Telephone Network is a system that allows people to make voice calls to each other across different locations. It connects telephones using a mix of wires, cables, and switches to route calls from one phone to another, whether they are next door or on the other side of the world. Telephone Network uses Circuit Switching. Originally, the entire network was referred to as a plain old telephone system (POTS).

Pre-requisites: Telephone Network

In this article, We will see how telephone system works and some terminologies related to it. Let’s start with some terminologies related to telephone system.