ISDN stands for

Indian Standard Data Network

Independent Software Data Network

Indian Standard Digital Network

Integrated Services Digital Network

ISDN stands for Integrated Services Digital Network.
It’s a set of communication standards that uses digital transmission to make phone calls, video calls, transmit data and other network services over the circuits of the traditional PSTN (Public Switched Telephone Network).
ISDN is a telecommunications technology that enables the transmission of digital data over standard phone lines.

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