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1 -Public Switched Telephone Network | Download Scientific Diagram
![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
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Overall architectural overview of the system. PSTN, public switched... | Download Scientific Diagram
