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Chinese National Standards
中華民國國家標準
- Taiwan 台灣 -
　

"busy, " CNS Standards List

X-Information & Communication
CNS 13883    2018 Edition
Integrated services digital network call forwarding busy, call forwarding no reply and call forwarding unconditional supplementary service
整體服務數位網路–忙線時、未應答及無條件指定轉接增添服務

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