This Recommendation specifies the formats and codes of the ISDN user part messages and parameters required to support basic bearerservices and supplementary services.
本建议规定ISDN用户部分支持基本的承载业务和补充业务要求的消息和参数的格式和编码。
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Recommendation I. 210 describes the principles for defining telecommunication services supported by an ISDN including the concept of bearerservices, teleservices and supplementary services.