In basic terms, it refers to technology that allows analog telephone calls to be sent and received over data networks - specifically, wide-area networks (WANs), local-area networks (LANs), and the internet.
N'okwu ndị bụ isi, ọ na-ezo aka na teknụzụ nke na-enye ohere ịnweta oku analog ekwentị iji zipu ma nata n'elu netwọk data-kpọmkwem, netwọk mpaghara (WANs), netwọk mpaghara (LANs), na ịntanetị.