DOD Hear it!

DOD definition - telecom
A PBX feature that allows a station user to dial an outside number without the assistance of an operator.The user generally first dials an access code, which by convention is the number 9 (nine) in North America, and 0 (zero) in most of the rest of the world.

Webster's New World Telecom Dictionary Copyright © 2008 by Wiley Publishing, Inc., Indianapolis, Indiana.
Used by arrangement with John Wiley & Sons, Inc.

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