Apa? teknologi panggilan telefon melalui network spt internet. VOIP tukarkan signal suara analog ke dlm digital data packets dan supports real-time, two-way transmission of conversations guna Internet Protocol (IP).
PSTN? Public Switched Telephone Network, didesign utk support komunikasi suara circuit-switched. Sebahagian dari PSTN juga diguna utk VoIP dan lain-lain teknologi network berasaskan Internet.
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