The State of Fixed-Line Telephone Services Going Forward November 6, 2015
Nippon Telegraph and Telephone Corporation
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  Migration to IP Networks
  Considerations to maintain fixed-line telephone services
  [Appendix] Migration of PSTN-Specific Functions to IP Networks
  Reference 1. Migration from PSTN to IP Networks
  Reference 2. The Changing Environment of Voice Communications
  Disclaimer
  The State of Fixed-Line Telephone Services Going Forward

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