Knowledge: numbering
See Also:
- business → telecommunications → regulation
- reference → directories → address and phone numbers → area codes
Links
- 800 Service Management System
http://www.sms800.com/ - Information about the central database for US toll free number management.
- The Telephone Exchange Name Project
http://ourwebhome.com/TENP/TENproject.html - The historical relationship between North American telephone exchange names and numbers.
- Number Portability
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
http://www.areacode-info.com/ - Detailed information on the history and current developments in North American NPA allocations.
- International Numbering Plans
http://www.numberingplans.com/ - A collection of all international numbering plans in the world. Some features require a paid subscription.
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