1. Wireless Number Portability Subcommittee Wireless Pooling Alternative Evaluation July 20, 1999

2. NANC Action Item DESCRIPTION Without Phase 2 LNP, wireless service providers could donate and receive 1000 blocks from a number pool, given certain requirements.

3. Real Issue CONCLUSION The alternative would not be a viable method for wireless participation in Thousand Block Pooling prior to Phase 2 LNP Implementation of this alternative could jeopardize compliance with the Phase 2 wireless LNP implementation deadline of November 24, 2002

4. Requirements and Impacts IMPACTS Eliminates default routing and triggerless methods for Phase 1 LNP Results in additional Code Holder and Default Routing responsibilities Requires modifications to wireless telephone number administration systems and procedures NPA NXX and database services are at risk, pending testing and debugging Requires modifications to the INC Thousand Block Pooling Administration Guidelines Requires modifications to Thousand Block Pooling administrator responsibilities

5. Barriers to Pooling Today LNP Functional Requirements TIA Phase 1 standard IS 756-0 –On originating calls, MSC triggers a query to obtain the LRN for correct routing TIA Phase 2 standard IS 756A –On terminating calls, the MSC must be able to accept and process the IAM of a dipped call, the CdPN=LRN (not the MDN)

6. Wireless Number Pooling Timeline 2Q3Q4Q1Q2Q3Q4Q1Q2Q3Q4Q 1999 200020012002 NPAC Changes Internal Requirements LNP Implementation 11/24/2002 4Q Testing NPAC Turn-up Intercarrier Roll Out Functional Specifications System Development Testing 1Q2Q3Q Regression Testing Wireless Holiday Season LNP Phase 1 and Phase 2 Software