+PSTN, the Public Switched Telephone Network, is the foundational global system for [Voice Communication](/wiki/Voice_Communication). It connects telephones through an intricate network, built upon [Circuit Switching](/wiki/Circuit_Switching) technology.
+## See also
+- [Telephone](/wiki/Telephone)
+- [VoIP](/wiki/VoIP)
+- [Telephony](/wiki/Telephony)
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