What is the difference between VoIP and PSTN?

VoIP (Voice Over Internet Protocol) transmits real-time voice signals from one IP address to another. Your voice signals are transmitted in digital form over the Wi-Fi or Ethernet through an analog telephone adapter or a softphone. The VoIP calls can be made from one phone to another or from a computer to a phone.

Public Switched Telephone Network (PSTN), on the other hand, uses circuit-switched telephony between two points for the duration of a call. It is the traditional telephone system that carries analog voice data via copper wires. Today, this voice data is digitized but it's carried over the phone network and it's separate from the internet traffic. PSTN is like a combination of telephone networks spread worldwide and this includes not just telephone lines but cellular networks, switching centers, cable systems, and fiber optic cables. These lines h elp telephones to communicate with one another.

Let's have a look at the difference between VoIP and PSTN:

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