What is a national numbering plan?

Within a national numbering plan, a complete destination telephone number is typically composed of an area code and a subscriber telephone number.

How are numbers assigned?

Each telephone is assigned a seven-digit telephone number unique only within its respective numbering plan area. The telephone number consists of a three-digit central office code and a four-digit station number.

How are phone numbers generated?

The first three digits are the area code, which refers to a broad geographic region. The next three digits denote the prefix, which typically corresponds to a smaller area within the area code’s region. With four remaining digits every local exchange has 10,000 possible unique numbers (from 0000 to 9999).

What is numbering plan in telecommunication?

National Numbering Plan (NNP): a plan that specifies the format and structure of the numbers used in identifying devices or subscribers connected to a network, which in turn can also be used for routing and call charging.

What does +1 mean for phone numbers?

+1 means the country code for the USA, Canada, some Caribbean nations and US colonies in the Pacific. The plus key symbolises that the international calling code be used should a caller be from another country.

Can phone numbers start with 1?

Perhaps more important, most cellphone carriers do not require the “1,” and some carriers even reject a call that begins with “1.” So it’s better for readers to just use plain old numbers, and omit the “1.” If someone needs it, the phone company will say so.

What does 44 mean in a phone number?

+44 is the international dialing code for the United Kingdom. Using +44 at the start of a British number allows you to call this number from outside of the UK.

How do I browse through the numbering plans?

Simply click on the numbering plan of your choice to freely browse through it. If you are not logged in, the amount of pages you are allowed to view may be limited.

What is a PSTN numbering plan?

A public, or PSTN, numbering plan is defined for a single country or group of countries. Government agencies or service providers typically administer PSTN numbering plans, subject to governmental oversight.

What is a telephone number?

Each telephone number is an address assigned to an endpoint in a network through which a designated subscriber can be reached. Depending on the local telephony requirements and network, a numbering plan can follow a number of strategies.

What is the difference between an open and a closed numbering plan?

An open numbering plan can assign various numbers of digits, while a closed numbering plan has a set number of digits. Numbering plans, in many cases, most significantly depend on the geographical zone of the subscriber: a fixed number of area codes is allotted depending on the state, city or region.