Telephone Numbering Plan

A telephone numbering plan is a type of numbering scheme used in telecommunications to allocate telephone numbers to subscribers and to route telephone calls in a telephone network. A closed numbering plan, such as found in North America, imposes a fixed total length to numbers. An open numbering plan features variance in the length of telephone numbers.

A dial plan establishes the expected number and pattern of digits for a telephone number. This includes country codes, access codes, area codes and all combinations of digits dialed. For instance, the North American public switched telephone network (PSTN) uses a 10-digit dial plan that includes a 3-digit area code and a 7-digit telephone number. Most PBXs support variable-length dial plans that use 3 to 11 digits. Dial plans must comply with the telephone networks to which they connect.

Read more about Telephone Numbering Plan:  History, Structure, Standards, Satellite Phone Numbering Plans, Special Services, Numbering Plans By Global Regions, Dial Plan Syntax, Numbering Plan Indicator

Famous quotes containing the words telephone, numbering and/or plan:

    Women who marry early are often overly enamored of the kind of man who looks great in wedding pictures and passes the maid of honor his telephone number.
    Anna Quindlen (b. 1952)

    The task he undertakes
    Is numbering sands and drinking oceans dry.
    William Shakespeare (1564–1616)

    Make a plan and you will find she has something else in mind;
    Alan Jay Lerner (1918–1986)