NNP — National Numbering Plan

NNP (National Numbering Plan) is used for efficient management of phone numbers and call routing. The system includes the structure and format of phone numbers, as well as the rules for their distribution and routing. Additionally, it keeps track of ranges and lists ported numbers, which are numbers transferred from one network to another.

1. Countries

   • Contains information about the telephone codes and numbers assigned to different countries.
   • Used for managing international calls, determining the rules for number formation, and routing calls to various countries. 

2. Cities

   • Contains information about the phone numbers assigned to different cities within a country.
   • Allows for the organization of local calls and management of routing within cities, which is important for urban telephone networks and mobile operators. 

3. Regions

   • Includes data on the distribution of phone numbers across regions within a country.
   • Ensures correct routing of calls across regions, which is important for network optimization and reducing costs for long-distance calls.  

4. Operators

   • Contains information about the phone numbers assigned to various telecom operators.
   • Allows tracking of number distribution among operators, managing number portability between operators (MNP - Mobile Number Portability), and ensuring correct call routing based on the operator.

Examples of NNP Usage in Virtual PBX

• Call Routing:
  • NNP helps automate the call routing process by determining, based on the phone number, where to direct the call (which city, region, or operator).
• Number Verification:
  • A virtual PBX can use NNP to verify the correctness of the entered number and provide the user with information about its ownership.
• Cost Optimization:
  • Utilizing NNP data can optimize call costs by choosing the most economical routes for connections.