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Related to numbering: Numbering machine
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That's because the numbering system is a relic of simpler times.
Since the adoption of NRO FCC Order 00-104 in March 2000, carriers that operate in the North American Numbering Plan (NANP) have been faced with several mandated requirements, commonly referred to as "Number Pooling".
Telcordia Technologies, known in the industry for its numbering administration expertise, has participated in the development of industry guidelines for thousands-block number pooling administration and implementation of telecommunications initiatives.
This shortage would cause frequent area code changes and ultimately lead to a premature exhaust of the North American Numbering Plan (NANP).