The history of the traditional PSTN
The traditional PSTN (Public Switched Telephone Network) has been continuously improving since its inception by Alexander Bell. There are good reasons why PSTN exists in its present condition.
What is Ring-Down
Initially, Bell developed a ring-down circuit, which means no dialing of numbers. Instead, a physical wire connected devices via two phone lines. Just grab the phone and the other person at the other end directly andthere was no ring at all.
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