标准摘要
[中文适用范围]： 本国际标准规定了使用 H.323 分组网络的功能，以互连构成专用综合业务网络 (PISN) 一部分的两个专用综合业务网络交换机 (PINX)。 通过在 H.323 呼叫信令信道上承载 PINX 间信令协议、利用 H.323 的协议隧道功能以及通过 H.323 建立的逻辑信道承载 PINX 间用户信息（例如语音）来实现互连。 323.每个逻辑通道通常代表通过实时传输协议（RTP）传送的单向媒体流。 PINX 间信令协议假定为 QSIG，如 ISO/IEC 11572、ISO/IEC 11582 和其他标准中所指定。 该国际标准提供了按需类型的互连，其中在每个 PISN 呼叫开始时建立单独的 H.323 呼叫，并在该呼叫结束时清除。 半永久场景被描述为附加选项，其中具有无限生命周期的单个 H.323 呼叫代表许多 PISN 呼叫携带 QSIG。 在本国际标准涵盖的场景中，参与呼叫的 PINX 不一定知道提供互连的 H.323 网络，可用的功能是 QSIG 网络的功能。 这与 QSIG 和 H.323 之间的真正互通（即 QSIG-H.323-QSIG）用于连接两个 PISN 或同一 PISN 的两个部分的场景不同。 在后一种情况下，所有网络以平等的条件参与呼叫，并且功能仅限于所有网络中可用且网关支持的功能。 后一种情况超出了本国际标准的范围。 该国际标准适用于可以使用 QSIG 作为 PINX 间信令协议互连形成 PISN 的 PINX。 [外文原描述]： ISO/IEC 23290:2004 specifies functions for using an H.323 packet network in order to interconnect two Private Integrated services Network eXchanges (PINXs) forming part of a Private Integrated Services Network (PISN). Interconnection is achieved by carrying the inter-PINX signalling protocol over the H.323 call signalling channel, making use of the protocol tunnelling facilities of H.323, and inter-PINX user information (e.g. voice) over logical channels established through H.323. Each logical channel usually represents a unidirectional media stream conveyed by means of the Real-time Transport Protocol (RTP). The inter-PINX signalling protocol is assumed to be QSIG, as specified in ISO/IEC 11572, ISO/IEC 11582 and other International Standards. ISO/IEC 23290:2004 provides for an on-demand type of interconnection, where a separate H.323 call is established at the start of each PISN call and cleared down at the end of that call. A semi-permanent scenario where a single H.323 call with an indefinite lifetime carries QSIG on behalf of many PISN calls is described as an additional option. In the scenarios covered in ISO/IEC 23290:2004, the PINXs participating in a call are not necessarily aware of the H.323 network providing the interconnection, and the features available are those of the QSIG network. This is different from a scenario where true interworking between QSIG and H.323 (i.e. QSIG-H.323-QSIG) is used to connect two PISNs or two parts of the same PISN. In this latter case, all networks participate in a call on equal terms, and features are limited to those available in all networks and supported by the gateways. This latter scenario is outside the scope of this document. ISO/IEC 23290:2004 is applicable to PINXs that can be interconnected to form a PISN using QSIG as the inter-PINX signalling protocol.
英文名称Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network (PISN) - Mapping functions for the tunnelling of QSIG through H.323 networks