ISO/IEC 15991:2003 信息技术 系统间的无线电通信和信息交换 专用集成服务网络 规范,功能模块和信息流 呼叫优先中断和呼叫优先中断保护辅助设备.

标准编号：ISO/IEC 15991:2003

中文名称：信息技术 系统间的无线电通信和信息交换 专用集成服务网络 规范,功能模块和信息流 呼叫优先中断和呼叫优先中断保护辅助设备.

英文名称：Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Specification, functional model and information flows — Call Priority Inter

发布日期：2003-04

标准范围

ISO/IEC 15991:2003规定了补充业务呼叫优先中断（SS-CPI）和呼叫优先中断保护（SS-CPIP），适用于专用综合业务网络（PISN）支持的各种基本业务。ISO/IEC 11574中规定了基本服务。注:此版本的ISO/IEC 15991不适用于电路模式多速率承载服务。SS-CPI是一种补充服务，它允许在没有用户信息信道可用的情况下成功地进行优先呼叫的呼叫请求。这是通过强制释放已建立的较低优先级的呼叫来实现的。SS-CPIP是一种补充服务，允许保护呼叫免受其他优先级呼叫的中断。SS-CPI和SS-CPIP是分开描述的，因为SS-CPIP和SS-CPIPCPI是主叫用户使用的服务，SS-CPIP是主叫用户或被叫用户使用的服务。根据ETS 300 387中描述的方法，分三个阶段产生补充服务规范。ISO/IEC 15991:2003包含SS-CPI的阶段1和阶段2规范。第1阶段规范（第6条）规定了一般特性原则和能力。第2阶段规范（条款7）标识了补充服务中涉及的功能实体以及它们之间的信息流。

ISO/IEC 15991:2003 specifies the Supplementary Services Call Priority Interruption (SS-CPI) and Call Priority Interruption Protection (SS-CPIP), which are applicable to various basic services supported by Private Integrated Services Networks (PISN). Basic services are specified in ISO/IEC 11574.

NOTE This edition of ISO/IEC 15991 does not apply to the circuit-mode Multiple Rate Bearer Service.

SS-CPI is a supplementary service that allows a call request for a priority call to proceed successfully in the case that there is no user information channel available. This is accomplished by force releasing an established call of lower priority.

SS-CPIP is a supplementary service that allows for the protection of calls against interruption from other, priority, calls.

SS-CPI and SS-CPIP are described separately because SS-CPI is a service used by a calling user, and SS-CPIP is a service used by either a calling user or a called user.

Supplementary service specifications are produced in three stages, according to the method described in ETS 300 387. ISO/IEC 15991:2003 contains the stage 1 and stage 2 specifications of SS-CPI. The stage 1 specification (clause 6) specifies the general feature principles and capabilities. The stage 2 specification (clause 7) identifies the Functional Entities involved in the supplementary service and the information flows between them.

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