ISO/IEC 23289:2002规定了“QSIG”和“H.323”之间的信令互通，以支持企业电信网络（CN）内的基本服务。 “QSIG”是一种信令协议，在专用综合业务网（PISN）内的专用综合业务网交换机（PINX）之间的Q参考点上运行。ISO/IEC 11579-1中定义了Q参考点。PISN为用户提供电路交换的基本业务和补充业务。QSIG在其他国际标准中有规定，尤其是ISO/IEC 11572（支持基本服务的呼叫控制）。 “H.323”是一组信令协议，用于支持分组网络内的语音或多媒体通信，尤其是使用互联网协议（IP）作为其网络层协议（IP网络）的分组网络。 H.323信令协议在IP网络中的端点之间运行，可以通过一个或多个网守间接运行，也可以直接运行。端点可以是另一个网络的终端或网关。H.323是一个“总括”建议，指的是各种ITU-T建议，尤其是建议H.225.0和H.245（基本通信能力）。 ISO/IEC 23289:2002规定了基本服务的信令互通，这些服务为采用QSIG的PISN和采用H.323的专用IP网络之间的语音、DTMF、传真和调制解调器媒体提供双向传输能力。本国际标准规定了在PISN和IP网络之间建立用户信息（音频）连接的要求，但在IP网络中传输音频以及在IP网络中建立和关闭音频传输的信令协议不在本国际标准的范围内。 补充服务不在本国际标准的范围内。 QSIG和H.323之间的互通允许在PISN用户处发起的呼叫在专用IP网络的用户处终止，或在专用IP网络的用户处发起的呼叫在PISN的用户处终止。 采用QSIG的PISN和采用H.323的公共IP网络之间的互通不在本国际标准的范围内。然而，当与其他相关功能（如数字翻译、安全功能等）一起部署时，本国际标准中规定的功能原则上适用于此类场景。 ISO/IEC 23289:2002适用于任何可以充当采用QSIG的PISN和采用H的专用IP网络之间网关的互通单元。 323.

ISO/IEC 23289:2002 specifies signalling interworking between "QSIG" and "H.323" in support of basic services within a corporate telecommunication network (CN). "QSIG" is a signalling protocol that operates at the Q reference point between Private Integrated services Network eXchange (PINX) within a Private Integrated Services Network (PISN). The Q reference point is defined in ISO/IEC 11579-1. A PISN provides circuit-switched basic services and supplementary services to its users. QSIG is specified in other International Standards, in particular ISO/IEC 11572 (call control in support of basic services). "H.323" is a set of signalling protocols for the support of voice or multimedia communication within a packet network, in particular a packet network that uses the Internet Protocol (IP) as its network layer protocol (IP network). H.323 signalling protocols operate between endpoints in an IP network, either indirectly via one or more gatekeepers, or directly. An endpoint can be a terminal or a gateway to another network. H.323 is an "umbrella" recommendation referring to various ITU-T recommendations, in particular recommendations H.225.0 and H.245 (basic communication capabilities). ISO/IEC 23289:2002 specifies signalling interworking for basic services that provide a bidirectional transfer capability for speech, DTMF, facsimile and modem media between a PISN employing QSIG and a private IP network employing H.323. This International Standard specifies requirements for establishing user information (audio) connections between the PISN and the IP network, but protocols for transmitting audio in the IP network and for signalling in order to establish and close down audio transmission in the IP network are outside the scope of this International Standard. Supplementary services are outside the scope of this International Standard. Interworking between QSIG and H.323 permits a call originating at a user of a PISN to terminate at a user of a private IP network, or a call originating at a user of a private IP network to terminate at a user of a PISN. Interworking between a PISN employing QSIG and a public IP network employing H.323 is outside the scope of this International Standard. However, the functionality specified in this International Standard is in principle applicable to such a scenario when deployed in conjunction with other relevant functionality (e.g., number translation, security functions, etc.). ISO/IEC 23289:2002 is applicable to any interworking unit that can act as a gateway between a PISN employing QSIG and a private IP network employing H.323.