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2013 发表于 2013-3-23 23:41:04

ISO/IEC 20113-2004 Information technology — Telecommunications and information

ISO/IEC 20113-2004 Information technology — Telecommunications and information exchange between systems — Private
Integrated Services Network — Specification, functional model and information flows — Make call request supplementary service


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21319817 发表于 2013-8-30 10:40:43

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