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Rationale for the Elimination of NANP Expansion Options by the INC

Rationale for the Elimination of NANP Expansion Options by the INC. September 24, 2002 Norman Epstein Verizon. INC Evaluation/Selection Process. • Identify best candidate expansion plans • Uniform Process – all plans treated equally • Required to meet Assumptions and Constraints

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Rationale for the Elimination of NANP Expansion Options by the INC

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  1. Rationale for the Elimination of NANP Expansion Options by the INC September 24, 2002Norman EpsteinVerizon

  2. INC Evaluation/Selection Process • Identify best candidate expansion plans • Uniform Process – all plans treated equally • Required to meet Assumptions and Constraints • Objective and Subjective evaluation per Assessment Criteria • Must be implementable e.g. dialing plan, transition plan, etc.

  3. Elimination of NANP Expansion Options 2A, 3A, 4A, and the Steering Code Proposal • OPTION 2A - 4 DIGIT NPA WITH NEW A DIGIT • (N)XXX + XXX + XXXX • OPTION 3A - NATIONAL DESTINATION CODE (NDC) • NDC (1 Digit) + NPA + XXX+ XXXX • OPTION 4A - 4 DIGIT NPA WITH NEW “B” DIGIT • N(X)XX + XXX + XXXX • Steering Code Proposal • SC (2 Digit) + NPA + XXX+ XXXX

  4. Eliminated Options User Impact Transition Problem NANP Exhaust Impact Dialing Problem Regulatory issue

  5. Rationale for Elimination of Option 2A • OPTION 2A - 4 DIGIT NPA WITH NEW A DIGIT • (N)XXX + XXX + XXXX • Rationale: • Transition Problem • 0+ Dialing is not supported • Dialing Problem • Reintroduction of 1+ prefix dialing • User Impact • Confuses relationship with existing NPAs. New NPAs less similar to existing than in other options

  6. Rationale for Elimination of Option 2A • 0 + Dialing Problem • For a credit card call during the permissive period: •   One can dial either: •   0 + (2) NPA - NXX – XXXX (Expanded format) or • 0 + NPA – NXX – XXXX (Existing format) • (Receives a prompt) + Credit card number • example: if original number was 202 345 9876 • Then during permissive time frame you can dial • 0 + (2) 202 345 9876 • or 0 + 202 345 9876 • A switch may think the first number is 0 220 234 5987 • There is no way to differentiate the old from the new

  7. Rationale for Elimination of Option 3A • OPTION 3A - NATIONAL DESTINATION CODE (NDC) • NDC (1 Digit) + NPA + XXX+ XXXX • Rationale: • Transition Problem • 0+ Dialing is not supported • Dialing Problem • Requires a prefix in transition and also on an ongoing basis for inter NDC dialing • Eliminates uniform dialing throughout the NANP • User Impact • No simple rule for transforming an old number to a new number; requires users to learn new geographical segmentation

  8. Rationale for Elimination of Option 4A • OPTION 4A - 4 DIGIT NPA WITH NEW “B” DIGIT • N(X)XX + XXX + XXXX • Rationale: • User Impact • Requires users to insert a digit in the middle of the area code • Regulatory Issue • Fails to address Canadian request for identification of unique geographic resources • NANP Exhaust Impact • Does not allow release of 80 N9X NPAs for immediate assignment since they are used for transition purposes

  9. Rationale for Elimination of Steering Code Proposal • Steering Code Proposal • SC (2 Digit) + NPA + XXX+ XXXX • Rationale: • Transition Problem - 0+ Dialing is not supported • Dialing Problems • Requires a prefix in transition and also on an ongoing basis for inter SC dialing • Eliminates uniform dialing throughout the NANP • User Impact • No simple rule for transforming an old number to a new number • Requires users to learn new geographic segmentation post implementation • Code conflicts - conflict between SC's in the 00 to 11 range and the existing NANP prefixes (e.g., 00, 01, 101XXXX, etc.).

  10. Additional Plans that were Eliminated • Approximately 20 additional proposals were considered. The following 4 examples represent other unique concepts submitted by the public: • Postalized Structure (ZIP Codes) - Two proposals were received recommending the use of U.S. postal zip codes as five-digit NPAs. • K Digit (eleventh digit) Service Identifier - This proposal was offered to resolve the problems associated with the increase in the number of NPA splits. A single NANP number which uses an eleventh digit to differentiate between services and/or applications e.g., home, office, fax, cellular, etc. • Non-Disruptive Plan for NANP Expansion - This proposed NANP Expansion Option uses five-digit NPA codes which, ultimately replace the existing three-digit NPAs. The two new digits are added after the existing NPA (i.e., NXX +XX).

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