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The correct answer is Integrated Services Digital Network Key Points ISDN, full form Integrated Services Digital Network. It i s a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network. In iSeries ISDN supports to basic rate interface. The Integrated Services Digital Network (ISDN) is a set of communication protocols that enable the simultaneous digital transmission of voice, video, data, and other network services over traditional Public Switched Telephone Network (PSTN) connections. ISDN aims to enable end-to-end digital connectivity to serve a diverse set of services. Integrated Services Digital Network (ISDN) is a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the digitalised circuits of the public switched telephone network. [1] . Key Points ISDN- Integrated Services Digital Network It is a circuit-switched telephone network system that transmits both data and voice over a digital line. It was designed to move outdated landline technology to digital. These digital lines are commonly telephone lines and exchanges established by the government.