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  1. International Numbering Plans is specialised in world-wide (tele)communications related numbering plans, and offers a range of on-line services for a variety of market segments in the global telecommunications sector. Most on-line services are free of charge for personal or limited use. For professional and business use various subscriptions ...

  2. Telephone numbering plan. A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. [1] Telephone numbers are the addresses of participants in a telephone network, reachable by a system of destination code routing.

  3. Depending on the nation or region, it may also be referred to as a numbering plan area, subscriber trunk dialling code, national destination code or routing code. country code A country code is used to reach the particular telephone system for each nation or special service. World Zone The World Zone is the first digit of a country code. This ...

  4. Number portability is very important in the international public telecommunication numbering plan. It works in the following way: The caller sets up the call by dialling the end user’s number, which in this case is a ported number. The end user’s number is enough to initiate the routing process.

  5. The major successful example of an integrated numbering plan is the North American Numbering Plan. The United States of America, Canada, and several Caribbean countries have a uniform integrated numbering plan behind the single -digit country code +1. This con stitutes the only major world region

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