What does ISTD mean in Telecom?

This page is about the meanings of the acronym/abbreviation/shorthand ISTD in the Computing field in general and in the Telecom terminology in particular.

International Subscriber Trunk Dialing

Computing » Telecom

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"ISTD." Abbreviations.com. STANDS4 LLC, 2015. Web. 21 Apr. 2015. <http://www.abbreviations.com/term/30566>.