Business » Telecommunications » Resources » Numbering (index): 800 Service Management System, The Telephone Exchange Name Project, Number Portability, Area Code Information ...


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09 November, 2009

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http://www.sms800.com/
Information about the central database for US toll free number management.

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http://ourwebhome.com/TENP/TENproject.html
The historical relationship between North American telephone exchange names and numbers.

Number Portability (Popularity:

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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:

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http://www.areacode-info.com/
Detailed information on the history and current developments in North American NPA allocations.

Active Numbers Online (Popularity:

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http://www.active-numbers.com/
OFTEL UK numbering allocations, North American area codes and country codes, with associated tariff information.

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http://www.numberingplans.com/
A collection of all international numbering plans in the world. Some features require a paid subscription.