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![PSTN (Public Switch Network) retrieved from [3] | Download Scientific Diagram](https://www.researchgate.net/publication/337590520/figure/fig1/AS:830048428908545@1574910375667/PSTN-Public-Switch-Network-retrieved-from-3.png "PSTN (Public Switch Network) retrieved from [3] | Download Scientific Diagram")
PSTN (Public Switch Network) retrieved from [3] | Download Scientific Diagram
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