September 24, 2002 Norman Epstein Verizon Rationale for the Elimination of NANP Expansion Options by the INC

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.

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

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

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 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 Then during permissive time frame you can dial 0 + (2) or A switch may think the first number is There is no way to differentiate the old from the new Rationale for Elimination of Option 2A

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 Rationale for Elimination of Option 3A

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 Rationale for Elimination of Option 4A

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.). Rationale for Elimination of Steering Code Proposal

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). Additional Plans that were Eliminated