![]() ![]() ![]() ![]() The key feature of ISDN is that it integrates speech and data on the same lines, adding features that were not available in the classic telephone system. Prior to ISDN, the telephone system was viewed as a way to transport voice, with some special services available for data. It was first defined in 1988 in the CCITT red book. Integrated Services Digital Network ( ISDN) is a set of communications standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network. For other uses, see ISDN (disambiguation). ![]()
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