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Integrated Services Digital Network (ISDN) is a system of digital phone connections, which has been available worldwide for over 20 years. ISDN provides significantly improved performance and reliability than a standard dedicated modem connection and offers speeds that can be greater than some XDSL services.

BusinessPhoneAustralia offer dedicated ISDN connections to provide digital access to the Internet and inter-site connectivity for data and/or voice services. ISDN voice and data are carried by bearer channels (B channels) occupying a bandwidth of 64kbs.Connectivity via dedicated ISDN requires an ISDN service. They also require an ISDN compatible terminating device such as a router, NTU, ISDN MODEM, or ISDN card.

Most recently, broadband Internet has largely displaced ISDN, such as XDSL and Cable Modem services. These services can be faster, less expensive, and easier to set up and maintain than ISDN. Still, ISDN has its place, as backup to dedicated lines, and in locations where broadband service is not available yet.