本文件定义了支持语音加数据（V+D）的地面集群无线电（TETRA）系统。它规定了:一般设计方面（例如参考点、编号和地址或协议架构）；系统承载和移动性管理服务，以及相应的空中接口协议；TETRA网络之间的互通；TETRA网络通过网关与其他网络互通；移动台上的外围设备接口；线路站（LS）与TETRA网络的接口；适用于TETRA网络和TETRA终端设备的安全协议和机制；适用于基本TETRA远程或承载业务的补充业务。 TETRA V+D互通-基本操作部分定义了TETRA网络之间在网络上的互通 相应接口:系统间接口（ISI）。它包括以下子部分:ISI通用设计；附加网络功能——ISI个人通话（ANF-ISIC）；附加网络功能——ISI群组呼叫（ANF-ISIGC）；附加网络功能——ISI短数据服务（ANF-ISISDS）；附加网络功能——ISI移动性管理（ANF-ISIMM）；ISI上用户信息的8kbit/s编码。本文件为ANF-ISIC子部分。

The present document defines the Terrestrial Trunked Radio (TETRA) system supporting Voice plus Data (V+D). It specifies:general design aspects (e.g. reference points, numbering and addressing, or protocol architecture);the system bearer and mobility management services, and the corresponding air interface protocols;the interworking between TETRA networks;the interworking of TETRA networks with other networks, via gateways;the peripheral equipment interface on the mobile station;the Line Station (LS) interface with TETRA networks;the security protocols and mechanisms applicable to TETRA networks and to TETRA terminal equipment;the supplementary services applicable to the basic TETRA tele- or bearer services.The TETRA V+D interworking - basic operation part defines the interworking between TETRA networks over the corresponding interface: the Inter-System Interface (ISI). It comprises the following subparts:ISI general design;Additional Network Feature - ISI Individual Call (ANF-ISIIC);Additional Network Feature - ISI Group Call (ANF-ISIGC);Additional Network Feature - ISI Short Data service (ANF-ISISDS);Additional Network Feature - ISI Mobility Management (ANF-ISIMM);8 kbit/s encoding of user information at the ISI.The present document is the ANF-ISIIC sub-part.