Transcription of 固定電話のIP網移⾏後の ... - ntt-east.co.jp
{{id}} {{{paragraph}}}
Example: air traffic controller
固定電話のIP網移⾏後の ... - ntt-east.co.jp
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) IP NTT 3 PSTN 2025 IP IP 2025 1 2024 INS IP 42017 2021 2024 IP 2025 IP IP
【参考】ntt東⻄の固定電話回線数の推移 ntt東⻄の固定電話は、ピーク時の1997年から2016年で 6割以上の減少。
Loading..
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document: