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Category: Business » Telecommunications » Resources » Numbering

	Numbering	Records 1-3 of 3
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	800 Service Management System (Popularity: ) http://www.sms800.com/ Information about the central database for US toll free number management.
	Number Portability (Popularity: ) http://www.ported.com/ Collates information on the regional initiatives in place to develop number portability and number pooling in the US.
	Area Code Information (Popularity: ) http://www.areacode-info.com/ Detailed information on the history and current developments in North American NPA allocations.