How Does the Telephone System Work?
American Numbering Plan,
Routing Calls through the Network,
at AT&T Labs
of communication and networking terms,
from Lucent Technologies
Bell Canada's Guide to
How Telephones Work
from How Stuff Works
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Phone cord from
Ringing phone from
Last updated March 1, 1999.
Copyright George Watson, Univ. of Delaware, 1996.