标准编号：ISO/IEC 17343:2007
中文名称：信息技术 系统间远程通信和信息交换 企业远程通信网络 QSIG与SIP间的信令互通 基本业务
英文名称：Information technology — Telecommunications and information exchange between systems — Corporate telecommunication networks — Signalling interworking between QSIG and SIP — Basic services
发布日期：2007-11
标准范围
This International Standard specifies signalling interworking between QSIG and the Session Initiation Protocol(SIP) in support of basic services within a corporate telecommunication network (CN) (also known asenterprise 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 andsupplementary services to its users. QSIG is specified in other Standards; in particular [2] (call control insupport of basic services), [3] (generic functional protocol for the support of supplementary services), and anumber of standards specifying individual supplementary services.NOTE The name QSIG was derived from the fact that it is used for signalling at the Q reference point. The Qreference point is a point of demarcation between two PINXs.SIP is an application-layer protocol for establishing, terminating, and modifying multimedia sessions. It istypically carried over IP [15], [16]. Telephone calls are considered a type of multimedia session where justaudio is exchanged. SIP is defined in [10].As the support of telephony within corporate networks evolves from circuit-switched technology to Internettechnology, 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 SIPnetwork and a participant in the QSIG network. Such calls are supported by gateways that performinterworking between SIP and QSIG.This International Standard specifies SIP-QSIG signalling interworking for basic services that provide a bidirectionaltransfer capability for speech, DTMF, facsimile, and modem media between a PISN employingQSIG and a corporate IP network employing SIP. Other aspects of interworking, e.g., the use of RTP andSDP, will differ according to the type of media concerned and are outside the scope of this InternationalStandard.Call-related and call-independent signalling in support of supplementary services is outside the scope of thisInternational Standard, but support for certain supplementary services (e.g., call transfer, call diversion) couldbe 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 acorporate 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 ofthis International Standard. However, the functionality specified in this International Standard is in principleapplicable to such a scenario when deployed in conjunction with other relevant functionality (e.g., numbertranslation, security functions, etc.).This International Standard is applicable to any interworking unit that can act as a gateway between a PISNemploying QSIG and a corporate IP network employing SIP.
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