Rationale for the Elimination of NANP Expansion Options by the INC

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

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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

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Eliminated Options
User Impact
Transition Problem
NANP Exhaust Impact
Dialing Problem
Regulatory issue
4 digit NPA with new A digit (N)XXX XXX XXXX
National Destination Code (NDC) NDC (1 Digit) NPA XXX XXXX
4 DIGIT NPA WITH NEW B DIGIT N(X)XX XXX XXXX
Steering Code Proposal SC (2 Digit) NPA XXX XXXX

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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

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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

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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

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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.).

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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).