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== PSTN ==
The '''Public Switched Telephone Network''' is the global network of national, regional, and/or local [[telephony]] operators.

Originally a network of landline telephone systems, the '''PSTN''' is now largely digital and includes both wired and wireless (cellular, satellite) systems. Many of the networks have, or are progressively, migrating to [[InternetProtocol|Internet Protocol]].

=== See also ===

* [[https://en.wikipedia.org/wiki/Public_switched_telephone_network|English Wikipedia article]]