信息技术.系统间的远程通信和信息交换.联合远程通信网.程控交换机组网的全球标准和会话发起协议间的信令互通.基本业务

[中文适用范围]： 该国际标准规定了 QSIG 和会话发起协议 (SIP) 之间的信令互通，以支持企业电信网络 (CN)（也称为企业网络）内的基本服务。 QSIG 是一种在专用综合业务网络 (PISN) 内的专用综合业务网络交换 (PINX) 之间运行的信令协议。 PISN 为其用户提供电路交换基本服务和补充服务。 QSIG 在其他标准中有所规定；特别是[2]（支持基本服务的呼叫控制）、[3]（支持补充服务的通用功能协议）以及一些指定各个补充服务的标准。 注：QSIG 这个名称源自于它用于 Q 参考点的信令。 Q 参考点是两个 PINX 之间的分界点。 SIP 是用于建立、终止和修改多媒体会话的应用层协议。 它通常通过 IP 承载[15]、[16]。 电话呼叫被认为是一种仅交换音频的多媒体会话。 SIP 在[10]中定义。 随着企业网络中对电话的支持从电路交换技术发展到互联网技术，这两种技术将在许多网络中共存一段时间，也许几年。 因此，需要能够建立、修改和终止涉及SIP网络中的参与者和QSIG网络中的参与者的会话。 此类呼叫由在 SIP 和 QSIG 之间执行互通的网关支持。 本国际标准规定了基本服务的 SIP-QSIG 信令互通，这些基本服务为采用 QSIG 的 PISN 和采用 SIP 的企业 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。 互通的其他方面，例如 RTP 和 SDP 的使用，将根据相关媒体的类型而有所不同，并且不属于本国际标准的范围。 支持补充服务的与呼叫相关和与呼叫无关的信令超出了本国际标准的范围，但对某些补充服务（例如呼叫转移、呼叫转移）的支持可能是未来工作的主题。 QSIG 和 SIP 之间的互操作允许源自 PISN 用户的呼叫终止于企业 IP 网络的用户，或者源自企业 IP 网络的用户的呼叫终止于 PISN 用户。 采用 QSIG 的 PISN 与采用 SIP 的公共 IP 网络之间的互通不属于本国际标准的范围。 然而，当与其他相关功能（例如，号码转换、安全功能等）结合部署时，本国际标准中规定的功能原则上适用于这种场景。 本国际标准适用于任何可以充当采用 QSIG 的 PISN 和采用 SIP 的企业 IP 网络之间网关的互通单元。 [外文原描述]： ISO/IEC 17343:2007 specifies signalling interworking between QSIG and the Session Initiation Protocol (SIP) in support of basic services within a corporate telecommunication network (CN) (also known as enterprise network). QSIG is a signalling protocol that operates between Private Integrated services Network eXchanges (PINX) within a Private Integrated Services Network (PISN). A PISN provides circuit-switched basic services and supplementary services to its users. QSIG is specified in other Standards. NOTE The name QSIG was derived from the fact that it is used for signalling at the Q reference point. The Q reference point is a point of demarcation between two PINXs. SIP is an application-layer protocol for establishing, terminating, and modifying multimedia sessions. It is typically carried over IP. Telephone calls are considered a type of multimedia session where just audio is exchanged. As the support of telephony within corporate networks evolves from circuit-switched technology to Internet technology, the two technologies will coexist in many networks for a period, perhaps several years. Therefore, there is a need to be able to establish, modify, and terminate sessions involving a participant in the SIP network and a participant in the QSIG network. Such calls are supported by gateways that perform interworking between SIP and QSIG. ISO/IEC 17343:2007 specifies SIP-QSIG signalling interworking for basic services that provide a bi-directional transfer capability for speech, DTMF, facsimile, and modem media between a PISN employing QSIG and a corporate IP network employing SIP. Other aspects of interworking, e.g., the use of RTP and SDP, will differ according to the type of media concerned and are outside the scope of ISO/IEC 17343:2007. Call-related and call-independent signalling in support of supplementary services is outside the scope of ISO/IEC 17343:2007, but support for certain supplementary services (e.g., call transfer, call diversion) could be the subject of future work. Interworking between QSIG and SIP permits a call originating at a user of a PISN to terminate at a user of a corporate IP network, or a call originating at a user of a corporate IP network to terminate at a user of a PISN. Interworking between a PISN employing QSIG and a public IP network employing SIP is outside the scope of ISO/IEC 17343:2007. However, the functionality specified in ISO/IEC 17343:2007 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 17343:2007 is applicable to any interworking unit that can act as a gateway between a PISN employing QSIG and a corporate IP network employing SIP.