本ETS给出了第3层无线电接口补充业务规范的一般方面。GSM 04.8x和04.9x系列规定了在无线电接口（参考点Um，定义见inGSM 04.02）处用于补充业务的正常操作、注册、擦除、激活、停用、调用和询问的程序。补充业务的提供和撤销是移动用户和服务提供商之间的管理事项，不会在无线电接口上发出信号。GSM 04.08和GSM 04.80规定了补充业务的格式和编码。GSM 02.04、GSM 02.8x和02.9x系列中给出了补充业务的定义和说明。GSM 03中描述了补充业务的技术实现。 11和GSM 03.8x和03.9x系列。第3层无线电接口的呼叫控制、移动性管理和无线电资源管理程序在GSM 04.07和GSM 04.08中定义。

In this ETS the general aspects of the specification of supplementary services at the layer 3 radio interface are given. GSM 04.8x and 04.9x-series specify the procedures used at the radio interface (reference point Um as defined inGSM 04.02) for normal operation, registration, erasure, activation, deactivation, invocation and interrogation of supplementary services. Provision and withdrawal of supplementary services is an administrative matter between the mobile subscriber and the service provider and cause no signalling on the radio interface. GSM 04.08 and GSM 04.80 specifies the formats and coding for the supplementary services. Definitions and descriptions of supplementary services are given in GSM 02.04 and GSM 02.8x and 02.9x-series. Technical realization of supplementary services is described in GSM 03.11 and GSM 03.8x and 03.9x-series. The procedures for Call Control, Mobility Management and Radio Resource management at the layer 3 radio interface are defined in GSM 04.07 and GSM 04.08.