ITU-T Q 87 1-1993 Stage 2 Description for Additional Information Transfer Supplementary Services Clause 1 - User-to-User Signalling (UUS) - General Recommendations on Telephone Swion F.pdf
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1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 1 TELECOMMUNICATION (03/93)STANDARDIZATION SECTOROF ITU%.%2!,G0G02%#/-%.$!4)/.3G0G0/.G0G04%,%0(/.%37)4#().G0G0!.$G0G03).!,).modified at Helsinki, 1993)1 User-to-User Signalling (UUS)1.1 ScopeThis Recommendation defines the Stage 2 of the Integrated Servic
2、es Digital Network (ISDN) as provided by thetelecommunications operators for the User-to-User Signalling (UUS) supplementary services. Stage 2 identifies thefunctional capabilities and the information flows needed to support the service description. The Stage 2 description alsoidentifies user operat
3、ions not directly associated with a call (see Recommendation I.130 1).This Recommendation is defined according to the methodology specified in Recommendation Q.65 2.This Recommendation does not formally describe the relationship between these supplementary services and the basiccall but, where possi
4、ble this information is included for guidance.In addition this Recommendation does not specify the requirements where the service is provided to the user via aprivate ISDN. This Recommendation does not specify the requirements for the allocation of defined functional entitieswithin a private ISDN; i
5、t does, however, define which functional entities may be allocated to a private ISDN.This Recommendation does not specify the additional requirements where the service is provided to the user via aTelecommunications network that is not an ISDN.The UUS supplementary service allows an ISDN user to sen
6、d/receive a limited amount of information to/from anotherISDN user over the signalling channel in association with a call to the other ISDN user.NOTE These procedures are applicable to user-to-user information (UUI) transfer in association with a circuit-switchedtelecommunication service only. Proce
7、dures to permit UUI transfer in association with other types of calls (e.g. packet bearer service)need to be investigated.The UUS supplementary services are applicable to all telecommunication services.This Recommendation is applicable to the Stage 3 Recommendation for the ISDN UUS supplementary ser
8、vices, asdefined in Recommendation I.130 1.1.2 ReferencesThese references are cited at the appropriate places in the text and the publications are listed hereafter. Dated references,subsequent amendments to, or revisions of any of these publications apply to this Recommendation only whenincorporated
9、 in it by amendment or revision. For undated references the latest edition of the publication referred toapplies.1 CCITT Recommendation Method for the characterization of telecommunication services supported by an ISDNand network capabilities of an ISDN, Rec. I.130, 1988.2 CCITT Recommendation Stage
10、 2 of the method for the characterization of services supported by an ISDN, Rec.Q.65, 1988.3 CCITT Recommendation Integrated Services Digital Network (ISDN); User-to-User Signalling (UUS)supplementary service; Service description, Rec. I.257.1.2 Recommendation Q.87 (03/93)4 CCITT Recommendation Inte
11、grated Services Digital Network (ISDN); Basic call handling for Circuit SwitchedBearer Services; Functional capabilities and information flows, Rec. Q.71, 1972.5 CCITT Recommendation Vocabulary of terms for ISDNs, Rec. I.112, 1988.6 CCITT Recommendation Principles of telecommunication services suppo
12、rted by an ISDN and the means todescribe them, Rec. I.210, 1988.1.3 DefinitionsFor the purpose of this Recommendation, the following definitions apply:Integrated Services Digital Network (ISDN): see 2.3/I.112 definition 308 5.Service: telecommunication service: see 2.2/I.112 definition 201 5.Supplem
13、entary service: see 2.4/I.210 6.1.4 Symbols and abbreviationsFor the purpose of this Recommendation, the following abbreviations are used:CC Call ControlCCA Call Control AgentFE Functional EntityFEA Functional Entity ActionISDN Integrated Services Digital NetworkLE Local Exchangenp Not Providedp Pro
14、videdPNX Private Network Exchangere Requested and Essentialrne Requested but Not EssentialUUS1 User-to-User Signalling Service 1UUS2 User-to-User Signalling Service 2UUS3 User-to-User Signalling Service 3TE Terminal EquipmentUUI User-to-User InformationUUM User-to-User MessageUUS User-to-User Signal
15、ling1.5 DescriptionThe general description of the UUS supplementary service is specified in Recommendation I.257.1 3.1.6 Derivation of the functional model1.6.1 Functional model descriptionThe model for the UUS supplementary service is shown in Figure 1-1.Recommendation Q.87 (03/93) 3FE1 FE2 FE3 FE4
16、 FE5T1135430-91/d01rarbrcdrFIGURE 1-1/Q.87Functional modelFIGURE 1-1/Q.87.D01 = 3.5 CM1.6.2 Description of the functional entitiesThe functional entities required by the UUS supplementary services in addition to those of the basic call as follows:1.6.2.1 FE1FE1 is the functional entity that serves t
17、he user and is responsible for initiating functional requests and interacting withnetwork.1.6.2.2 FE2FE2 is the functional entity within the network that cooperate with their peers to provide the services requested by FE1and FE5.1.6.2.3 FE3FE3 is the functional entity within the network that coopera
18、te with their peers to provide the services requested by FE1and FE5.1.6.2.4 FE4FE4 is the functional entity within the network that cooperate with their peers to provide the services requested by FE1and FE5.1.6.2.5 FE5FE5 is the functional entity that serves the user and is responsible for initiatin
19、g functional requests and interacting withnetwork.1.6.3 Relationship with a basic serviceThe relationship with a basic service is shown in Figure 1-2. The model for basic call handling is defined inRecommendation Q.71 4.Service 1 is carried across the network as part of Basic service. Services 2 and
20、 3 allow additional messages to beaccepted and processed from specific states in the basic service model. These messages do not alter the state but requirean action to take place.1.6.3.1 Description of the call control agent functional entityThe CCA functional entity supports the functionality to:a)
21、 access the service-providing capabilities of the CC entities, using service requests to establish, manipulateand release a single call;b) receive indications relating to the call from the CC entity and relay them to the user;c) maintain call state information as perceived from this functional end-p
22、oint of the service (i.e. a single-ended view of the call).4 Recommendation Q.87 (03/93)FE1 FE2 FE4CCA CC CC CC CCAFE3 FE5T1135440-91d02BasiccallFIGURE 1-2/Q.87Relationship of UUS with a basic servicerar1rbr2r2rcdr1FIGURE 1-2/Q.87.D02 = 4.5 CM1.6.3.2 Description of the call control (CC) functional e
23、ntityThe CC functional entity supports the functionality to:a) establish, manipulate and release a single call (upon request of the CCA entity);b) associate and relate the CCA entities that are involved in a particular call and/or service;c) manage the relationship between the CCA entities involved
24、in a call (i.e. reconcile and maintain theoverall perspective of the call and/or service).1.7 Information flows1.7.1 Information flow diagramsInformation flow diagrams for User-to-User Signalling service call setup, service usage and call release are shown inFigures 1-3 to 1-11. Figure 1-3 shows a s
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