Public Switched Telephone Network (PSTN) - SS1 ICT Lesson Note

The Public Switched Telephone Network (PSTN) is the traditional global network used for voice communication through landline telephones. It's a circuit-switched network that has been in use for decades. In a circuit-switched network like PSTN, a dedicated communication path, or circuit, is established between two parties for the duration of their conversation. This ensures a consistent and dedicated connection throughout the call. PSTN supports analog voice signals, and it's the foundation of early telephony.

Source:(ringcentral.com)

However, with the advent of digital communication technologies and the internet, the PSTN has seen a decline in use, and many regions are transitioning towards Voice over Internet Protocol (VoIP) for voice communication.