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NANPA North American Numbering Plan Administration
Area Code Info including Canada and Non US
International Country Codes
Erlang traffic calculators for dimensioning telecommunications trunk groups and analysing the staffing requirments of a call center
This site contains local calling, area code, and prefix information for Canada, the United States of America, and other countries which are part of the North American Numbering Plan.
AT&T corporate site which relates the origin and history of the company
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Useful Links
Services
Contact Information
Personal tales from people in the telecom business
Transfer at a gigabit speed info and technical issues
information on NPA NXX assignments
Telecom Routing
Useful Telecom Links
Below are links that you might find useful and informative

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AreaCode-Info.Com - Regional Area Code Information with (Non-US)
NANPA North American Numbering Plan Administration
International Dialing Codes
Westbay Online traffic calculators
The history and origins of AT&T
Local Calling Guide
Tip and Ring web site
npanxx.net