The big switch off
The PSTN (Public Switched Telephone Network) is the traditional system that has been used for making phone calls for over a century. It is an analog system that uses copper wires to transmit voice signals between two points.
The PSTN (Public Switched Telephone Network) is the traditional system that has been used for making phone calls for over a century. It is an analog system that uses copper wires to transmit voice signals between two points.