A
telephone number is a
sequence of
decimal digits that uniquely indicates the network termination point. The number contains the information necessary to identify the intended endpoint for the
telephone call. Telephone numbers are often assigned to lines that have other devices connected such as
faxes,
modems,
subscribers and network services. Each such endpoint must have a unique number within the
public switched telephone network. Most countries use fixed length numbers (for normal lines at least) and therefore the number of endpoints determine the necessary length of the telephone number. It is also possible for each subscriber to have a set of shorter numbers for the endpoints most often used. These "shorthand" or "speed calling" numbers are automatically translated to unique telephone numbers before the call can be connected. Some special services have their own short numbers (e.g.
9-1-1,
4-1-1,
9-9-9 and
1-1-2). Many systems also allow calls within a local area to be made without dialing the local
area code.
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