This Recommendation specifies the formats and codes of the ISDN user part messages and parameters required to support basic bearer services 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。
Recommendation I. 210 describes the principles for defining telecommunication services supported by an ISDN including the concept of bearer services, teleservices and supplementary services.
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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