Recommendation I.210 describes the principles for defining telecommunication services supported by an ISDN including the concept of bearer services, teleservices and supplementary services.
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释义
建议I.;210描述了规定各种电信业务的原则,这些电信业务是由包含承载业务、用户终端业务和补充业务概念的ISDN所支持的。
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