Transcription of 固定電話のIP網移⾏後の ... - ntt-east.co.jp
1 IP 2017 4 6 2010 11 PSTN 2015 11 2025 PSTN IP IP IP IP IP IP IP IP IP 2 PSTN Public Switched Telephone Network INS IP (1) INS (2) IP 3 NTT 00XY (3) IP (4) IP IP (5)
2 IP NTT 3 PSTN 2025 IP IP 2025 1 2024 INS IP 42017 2021 2024 IP 2025 IP IP IP IP 3 IP IP INS 2 2022 IP 2017 IP IP 4 IP ( ) IP 2024 2025 2017 2022 IP IP IP IP IP 5 NTT NTT 1997 2016 6,300 7,0002,172 6,0005,0004,0003,0002,0001,000 ( )
3 INS1500 INS 64 10 2016 12 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 66 1997 1998 19992016 6482385317271 225 189 155 126 101 82 68 56 49 43 37 3260726559 51 44 38 31 25 21 17 15 13 12 10 9010020030040050060020002001200220032004 2005200620072008200920102011201220132014 2015 34261813 9 7 6 4 3 3 2 2 2 1 1 1 3 3 3 3 2 2 1 1 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 37 41 NTT NTT 2000 2015 9 2000 2015 93 2000 2015 97 542 93 97 7
