信息技术.系统间远程通信和信息交换.企业电信网.QSIG和SIP间信令互通.呼叫转移

[中文适用范围]： 本国际标准规定了企业电信网络 (CN)（也称为企业网络）内会话发起协议 (SIP) 和“QSIG”之间的呼叫转移互通。“QSIG”是一种信令协议，在专用综合业务网络 (PISN) 内的专用综合业务网络交换机 (PINX) 之间运行。PISN 为其用户提供电路交换基本服务和补充服务。QSIG 在标准中进行了规定，特别是 [1]（支持基本服务的呼叫控制）、[2]（支持补充服务的通用功能协议）和一些规定了单个补充服务的标准。转移服务在 [3]、[6] 中进行了规定，支持这些服务的 QSIG 信令协议在 [4]、[7] 中进行了规定。特别是，该信令协议向涉及的用户发送有关呼叫转移的信息。注意：QSIG 这个名称源于它用于在 Q 参考点发送信令。Q 参考点是两个 PINX 之间的分界点。 SIP 是一种应用层协议，用于建立、终止和修改多媒体会话。它通常通过 IP 进行传输。电话呼叫被视为一种仅交换音频的多媒体会话。SIP 的定义见 [10]。随着企业网络内的电话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、终止和传输涉及 SIP 网络参与者和 QSIG 网络参与者的会话。此类呼叫由在 SIP 和 QSIG 之间执行互通的网关支持。本规范规定了使用 QSIG 的 PISN 和使用 SIP 的企业 IP 网络之间的传输服务的 SIP-QSIG 信令互通。 [外文原描述]： ISO/IEC 23916:2005 specifies call transfer interworking between the Session Initiation Protocol (SIP) and "QSIG" within corporate telecommunication networks (CN), also known as enterprise networks. "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. SIP is an application layer protocol for establishing, terminating and modifying multimedia sessions. It is typically carried over IP. Telephone calls are considered as 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 co-exist in many networks for a period, perhaps several years. Therefore, there is a need to be able to establish, modify, terminate and transfer sessions involving participants in the SIP network and participants in the QSIG network. Such calls are supported by gateways that perform interworking between SIP and QSIG. ISO/IEC 23916:2005 specifies SIP-QSIG signalling interworking for transfer services between a PISN employing QSIG and a corporate IP network employing SIP.