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| Internet, Public Switched Telephone Network

...l]] (VoIP) service as a replacement for traditional wired access to the [[Public Switched Telephone Network]] (PSTN), there is no longer a local service provider specifically for tele

...ransmission of [[Signal (information theory)|electric signals]] over the [[Public Switched Telephone Network]] (PSTN) which allows almost any phone user to communicate with almost any The [[Public Switched Telephone Network]] (PSTN) has gradually evolved towards digital telephony which has improved

...ivities to the regulated business of the national telephone system (the [[Public Switched Telephone Network]] or PSTN). <ref name="How AT&T Works">{{cite web| url=http://electronics.h

...hnologies, such as the evolution of interconnection and switching in the [[Public Switched Telephone Network]] (Strowger-to-SS7-to-SIP proxy) and [[Internet]].