What does SDNB stand for?

What does SDNB mean? This page is about the various possible meanings of the acronym, abbreviation, shorthand or slang term: SDNB.

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Secondary DN Call Blocking

Computing » Telecom

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"SDNB." Abbreviations.com. STANDS4 LLC, 2016. Web. 4 Dec. 2016. <http://www.abbreviations.com/SDNB>.