本ETS描述了如何从技术角度实现GSM系统中补充业务的一般方面。有关特定补充业务的技术实现说明，请参见GSM 03.8x和03.9x系列技术规范。所有补充业务可能需要在无线电路径上发送信号。GSM 04.8x和04.9x系列技术规范中定义了使用的信令程序和消息。对于一些补充业务，需要在归属位置寄存器（HLR）、访客位置寄存器（VLR）和移动服务交换中心（MSC）之间传输信息。技术规范GSM 09.02中定义了此类信息传输的信令程序。GSM 02中给出了补充业务的定义和说明。 8x和02.9x系列技术规格。技术规范GSM 02.04中给出了定义。注:关于补充业务技术实现的技术规范没有区分订户、用户和客户，因为这三者都没有完全涵盖文本需求。通常使用“订户”一词，即使此人没有订阅。

This ETS describes the general aspects on how supplementary services in the GSM system are realized from a technical point of view. Description of technical realization for specific supplementary services can be found in GSM 03.8x and 03.9x-series technical specifications. All supplementary services may require signalling on the radio path. Signalling procedures and messages used are defined in the GSM 04.8x and 04.9x-series of technical specifications. For some supplementary services information needs to be transferred between the home location register (HLR), the visitor location register (VLR) and the mobile services switching centre (MSC). Signalling procedures for such information transfer are defined in technical specification GSM 09.02. Definitions and descriptions of supplementary services are given in the GSM 02.8x and 02.9x-series of technical specifications. Definitions are given in technical specification GSM 02.04. NOTE: The technical specifications on the technical realization of supplementary services do not distinguish between subscriber, user and customer, since all three do not fully cover the textual needs. Generally the term subscriber is used, even if this person is not having the subscription.