PSTN was originally used for traditional phones, but with fiber optics replacing copper wires, it is also used for internet telephony calls. Check out the difference between VoIP and PSTN systems.
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What is the difference between VoIP and PSTN

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PSTN was originally used for traditional phones, but with fiber optics replacing copper wires, it is also used for internet telephony calls. Check out the difference between VoIP and PSTN systems.

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