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    • What is PSTN? Definition from SearchNetworking

      SearchSecurity.com· 4 days ago

      The public switched telephone network, or PSTN, is the world's collection of interconnected voice-oriented public telephone networks. PSTN is the traditional circuit-switched telephone network ...

    • What the heck is VoIP? An expert explains.

      What the heck is VoIP? An expert explains.

      Mashable via AOL· 1 year ago

      If you've never heard of VoIP, don't panic. It is generally used to refer to a method of transmitting voice and multimedia communication via data packet...