ISDN-BRI (Basic Rate Interface) has never gained popularity as a telephone access technology in Canada and the US and today remains a niche product. The service was seen as a solution in search of a problem, and the extensive array of options and features were difficult for most customers to understand and utilize. ISDN has long been known by several derogatory acronyms highlighting these issues, such as It Still Does Nothing, Innovations Subscribers Don't Need, and I Still Don't kNow.
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