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1 -Public Switched Telephone Network | Download Scientific Diagram
What is the Public Switched Telephone Network (PSTN)?
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.jpg?width=649&name=What%20is%20VoIP%20(circuit-switching-vs-packet-switching-fig1).jpg "What Is the Public Switched Telephone Network (PSTN)?")
What Is the Public Switched Telephone Network (PSTN)?
![Public Switched Telephone Network Infrastructure [4] | Download Scientific Diagram](https://www.researchgate.net/publication/301408231/figure/fig1/AS:456441694822400@1485835588404/Public-Switched-Telephone-Network-Infrastructure-4.png "Public Switched Telephone Network Infrastructure [4] | Download Scientific Diagram")
Public Switched Telephone Network Infrastructure [4] | Download Scientific Diagram
A Typical Public Switching Telephone Network System | Download Scientific Diagram
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