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![VoIP network connected to PSTN (diagram adapted from: [8]) | Download Scientific Diagram](https://www.researchgate.net/publication/237114192/figure/fig1/AS:299289126424576@1448367496373/VoIP-network-connected-to-PSTN-diagram-adapted-from-8.png "VoIP network connected to PSTN (diagram adapted from: [8]) | Download Scientific Diagram")