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What does ISDNUP Stand For in Technology, IT etc. ?
For ISDNUP we have found 3 definitions.
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What does ISDNUP mean? We know 3 definitions for ISDNUP abbreviation or acronym in 1 categories. Possible ISDNUP meaning as an acronym, abbreviation, shorthand or slang term vary from category to category. Please look for them carefully.