本国际标准规定了基本标准的组合，以及适当选项和标准的选择 参数值，用于指定如何使用QSIG/PSS1在 专用综合业务网络交换机（PINX）和互连网络（ICN）之间的C参考点 允许来自不同供应商和不同公共或私人服务提供商的设备之间的互操作性。 附注1- 本国际标准意义上的PINX指直接连接到ICN的PINX。 本国际标准适用于连接的PINX和互连网络（ICN）。 本国际标准确定了特定功能、程序和服务的必要或可选使用 如果提供: -拟采用传输系统接口的物理和电气特性（物理层）； -数据链路层程序； -网络层程序；和 -补充服务和其他网络功能，以满足特定的公司网络用户需求。 本国际标准规定了对连接的PINX和互连网络（ICN）实施的要求 为了实现作为企业电信网络（CNs）的PISNs中设备之间的互操作性。 注2:本国际标准的实施并不妨碍制造商提供其他互连方式。 信息技术 也不排除VPN服务提供商在PINX和其他网络（如PSTN或ISDN）之间提供基本呼叫通信。 ISO/IEC TR 14475规定了PINX和参考点C和 T驻留在单个接口或单独的接口上。本国际标准的范围仅限于C参考 将方面指向一个单独的界面。 本国际标准的当前版本无意为ICN规定任何网关或终端PINX要求 界面的另一面。因此，它通常使用术语“虚拟传输PINX”，而不是互连网络（ICN）。

This International Standard specifies the combination of base standards, together with the selection of appropriate options and parameter values, necessary to specify how QSIG / PSS1 can be used to provide digital signalling capabilities at interfaces at the C reference point between a Private Integrated services Network eXchange (PINX) and an Interconnecting Network (ICN) to permit interoperability between equipment from different vendors and different public or private service providers. NOTE 1 - PINX in the sense of this International Standard is used in the meaning of a PINX directly attached to the ICN. This International Standard is applicable to attached PINXs and Interconnecting Networks (ICN). This International Standard identifies the necessary or optional employment of particular functions, procedures and services when provided: - physical and electrical characteristics (physical layer) of the interfaces to the transmission systems to be employed; - data link layer procedures; - network layer procedures; and - supplementary services and additional network features to meet specific corporate network user requirements. This International Standard states requirements upon attached PINXs and Interconnecting Network (ICN) implementations in order to achieve interoperability between equipment in PISNs serving as Corporate telecommunication Networks (CNs). NOTE 2 - Implementation of this International Standard does not preclude a manufacturer from offering other means of interconnection. It also does not preclude a VPN service provider to offer basic call communications between a PINX and other networks like PSTN or ISDN. ISO/IEC TR 14475 specifies various access arrangements between a PINX and a public network where reference points C and T reside either at a single or at separate interfaces. The scope of this International Standard is limited to cover the C reference point aspects at a separate interface. The current version of this International Standard does not intend to specify any gateway or end PINX requirements for the ICN side of the interface. Therefore it typically uses the term "virtual transit PINX" instead of Interconnecting Network (ICN).