1、INTERNATIONAL TELECOMMUNICATION UNIONCCITT Q.81THE INTERNATIONALTELEGRAPH AND TELEPHONECONSULTATIVE COMMITTEEFUNCTIONS AND INFORMATION FLOWSFOR SERVICES IN THE ISDNSTAGE 2 DESCRIPTIONFOR NUMBER IDENTIFICATIONSUPPLEMENTARY SERVICESSECTION 3 CALLING LINE IDENTIFICATION PRESENTATION (CLIP)SECTION 3 AND
2、 CALLING LINE IDENTIFICATION RESTRICTION (CLIR)SECTION 5 CONNECTED LINE IDENTIFICATION, PRESENTATIONSECTION 5 AND RESTRICTION (COLP AND COLR)Modifications toRecommendation Q.81Geneva, 1991FOREWORDThe CCITT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the
3、International Telecommunication Union (ITU). CCITT is responsible for studying technical, operating and tariffquestions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwidebasis.The Plenary Assembly of CCITT which meets every four years, establishes the
4、topics for study and approvesRecommendations prepared by its Study Groups. The approval of Recommendations by the members of CCITT betweenPlenary Assemblies is covered by the procedure laid down in CCITT Resolution No. 2 (Melbourne, 1988).Recommendation Q.81, 3 and 5 was prepared by Study Group XI a
5、nd was approved under the Resolu-tion No. 2 procedure on the 10th of September 1991._CCITT NOTEIn this Recommendation, the expression “Administration” is used for conciseness to indicate both atelecommunication Administration and a recognized private operating agency. ITU 1991All rights reserved. No
6、 part of this publication may be reproduced or utilized in any form or by any means, electronic ormechanical, including photocopying and microfilm, without permission in writing from the ITU.Recommendation Q.81 1Recommendation Q.81Recommendation Q.81STAGE 2 DESCRIPTION FOR NUMBER IDENTIFICATIONSUPPL
7、EMENTARY SERVICES(revised 1991)3 Calling Line Identification Presentation (CLIP) and Calling Line Identification Restriction (CLIR)3.1 ScopeThis Recommendation defines the stage 2 of the integrated services digital network (ISDN) as provided by thetelecommunications operators for the Calling Line Id
8、entification Presentation (CLIP) and Calling Line IdentificationRestriction (CLIR) supplementary services. Stage 2 identifies the functional capabilities and the information flowsneeded to support the service description. The stage 2 description also identifies user operations not directly associate
9、dwith 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 andthe basic call but, where possible, this information is inc
10、luded for guidance.In addition, this Recommendation does not specify the requirements where the service is provided to the uservia a private ISDN. This Recommendation does not specify the requirements for the allocation of defined functionalentities within a private ISDN; it does however define whic
11、h functional entities may be allocated to a private ISDN.This Recommendation does not specify the additional requirements where the service is provided to the uservia a telecommunications network that is not an ISDN.The CLIP supplementary service provides the called party with the possibility to rec
12、eive identification of thecalling party.The CLIR supplementary service enables the calling party to prevent presentation of its ISDN number to thecalled party.The CLIP and CLIR supplementary services are applicable to all telecommunication services.This Recommendation is applicable to the stage 3 Re
13、commendations for the ISDN CLIP and CLIRsupplementary services, as defined in Recommendation I.130 1.3.2 ReferencesThese references are cited at the appropriate places in the text and the publications are listed hereafter. Datedreferences, subsequent amendments to, or revisions of any of these publi
14、cations apply to this Recommendation onlywhen incorporated in it by amendment or revision. For undated references, the latest edition of the publication referredto applies.1 CCITT Rec. I.130 (1988) Method for the characterization of telecommunication services supported by anISDN and network capabili
15、ties of an ISDN.2 CCITT Rec. Q.65 (1988) Stage 2 of the method for the characterization of services supported by an ISDN.3 CCITT Rec. I.251.3 Calling Line Identification Presentation (CLIP).2 Recommendation Q.814 CCITT Rec. I.251.4 Calling Line Identification Restriction (CLIR).5 CCITT Rec. Q.71 ISD
16、N 64 kbit/s circuit mode switched bearer services.6 CCITT Rec. I.112 (1988) Vocabulary of terms for ISDNs.7 CCITT Rec. I.210 (1988) Principles of telecommunication services supported by an ISDN and the means todescribe them.8 CCITT Rec. E.164 (1991) Numbering plan for the ISDN era.9 CCITT Rec. I.330
17、 (1988) ISDN numbering and addressing principles.3.3 DefinitionsFor the purposes of this Recommendation, the following definitions apply:integrated services digital network (ISDN)See definition 308 of 2.3 of Recommendation I.112 6.service: telecommunication serviceSee definition 201 of 2.2 of Recomm
18、endation I.112 6.supplementary serviceSee 2.4 of Recommendation I.210 7.ISDN numberA number conforming to the numbering plan and structure specified in Recommendation E.164 8.PNP numberA number conforming to the numbering plan and structure in a private network.sub-addressSee 5.4 of Recommendation I
19、.330 9.calling line identityThe address (the ISDN number, and if supplied the sub-address) of the calling line, and the screeningindicator. If these are not available the reason is indicated, via the presentation indicator.presentation indicator (PI)The PI provides instructions on whether or not the
20、 provided calling line identity is allowed to be presented, orindicates that the number is not available.screening indicator (SI)The SI provides information on the source and the quality of the provided information.Recommendation Q.81 33.4 Symbols and abbreviationsCLIP Calling Line Identification Pr
21、esentationCLIR Calling Line Identification RestrictionPI Presentation IndicatorSI Screening indicatorISDN Integrated services digital networkTE Terminal equipmentPNX Private network exchangeLE Local exchangeINT TR International transit exchangeFEA Functional entity actionSDL Specification and descri
22、ption languagePNP Private Numbering Plan3.5 DescriptionThe relationship between the CLIP and CLIR supplementary services is described in 3.6.6 ofRecommendation I.251.3 3 and in Recommendation I.251.4 4.The provisions for overriding the CLIP supplementary service are described in 3.3.4.2 and 3.6.6 of
23、Recommendation I.251.3 3 and in Recommendation I.251.4 4.3.6 Derivation of a functional model3.6.1 Functional model descriptionThe model for the CLIP and CLIR supplementary services is shown in Figure 3-1/Q.81.T1126230-90FE1 FE2 FE3 FE4 FE5rrr rabdFIGURE 3-1/Q.81Functional modelc4 Recommendation Q.8
24、13.6.2 Description of the functional entitiesThe functional entities required by the CLIP and CLIR supplementary services above those of the basic callare as follows:FE1:caller provided information and CLIR requesting entity;FE2:service information checking entity;FE3:handling of calling line identi
25、ty at international gateway;FE4:service providing entity;FE5:service requesting entity.3.6.3 Relationship with a basic serviceThe relationship with a basic service is shown in Figure 3-2/Q.81. The model for basic call handling is definedin Recommendation Q.71.3.7 Information flows3.7.1 Information f
26、low diagramsFigure 3-3/Q.81 shows the information flow diagrams for the CLIP and the CLIR supplementary services.3.7.2 Definition of individual information flowsWithin the definitions below, the PI can take one of the following three rules:a) presentation allowed;b) presentation restricted; orc) num
27、ber not available.Within the definitions below, the SI can take one of the following three rules:a) user provided, verified and passed;b) network provided; orc) user provided, not screened.Recommendation Q.81 5T1126241-91FE1 FE2 FE3 FE4 FE5rr r rab c dCCA CC CC CC CCArr r r232FIGURE 3-2/Q.811Example
28、 of a mapping of the functional modelon a model for the basic call910211 221911915916917918920921922923924925926927221 231930931932933934231 241940941942943944241 251950951952T1126250-90FE1 FE2 FE3 FE4 FE5rrrrabcdFIGURE 3-3/Q.81SETUPreq. ind.INFORM 1req. ind.SETUPreq. ind.SETUPreq. ind.INFORM 2req.
29、ind.INFORM 3req. ind.SETUPreq. ind.INFORM 4req. ind.INFORM 4ind.Information flows6 Recommendation Q.813.7.2.1 Relationship ra3.7.2.1.1 Contents of INFORM 1The contents of the INFORM 1 are shown in Table 3-1/Q.81.The contents for SETUP are as specified for basic call (see Recommendation Q.71 5).TABLE
30、 3-1/Q.81INFORM 1 contentsMand. MandatoryOpt. OptionalNote 1 Included if FE1 provides information.Note 2 When a special arrangement exists only national or international number is allowed.Note 3 May be omitted even if number information is provided.Note 4 This information flow is mandatory only in t
31、he case that the CLIR supplementary servicetemporary mode applies and FE1 wants to override the default PI stored in FE2.Note 5 In the case of the supplementary service Private Numbering Plan (PNP), other types ofnumber may be required and will be specified in the PNP-Recommendation.Parameter Allowe
32、d value Req. ind.Number information Numbering plan identification Type of number Number digits Sub-addressPresentation indicatorISDN numberPrivate Numbering PlanPartial numberSubscriber numberNational numberInternational number(Note 2)(Note 5)Presentation allowedPresentation restrictedOpt. (Note 1)M
33、and.Mand.Mand.Opt. (Note 3)Opt. (Note 4)Recommendation Q.81 73.7.2.2 Relationship rb3.7.2.2.1 Contents of INFORM 2The contents of the INFORM 2 are shown in Table 3-2/Q.81. The contents for SETUP are as specified forbasic call (see Recommendation Q.71 5).TABLE 3-2/Q.81INFORM 2 contentsMand. Mandatory
34、Opt. OptionalNote 1 This information flow is included only in the case that FE1 provides the information.Note 2 In the case of the supplementary service Private Numbering Plan (PNP), other types ofnumber may be required and will be specified in the PNP-Recommendation.Parameter Allowed value Req. ind
35、.Number information Numbering plan identification Type of number Number digits Sub-addressISDN numberPrivate Numbering PlanNational numberInternational number(Note 2)Mand.Mand.Mand.Mand.Opt. (Note 1)Presentation indicator (PI) Presentation allowedPresentation restrictedMand.Screening indicator (SI)
36、Network provided numberUser provided number,verified and passed.User provided number,not screenedMand.8 Recommendation Q.813.7.2.3 Relationship rc3.7.2.3.1 Contents of INFORM 3The contents of the INFORM 3 are shown in Table 3-3/Q.81. The contents for SETUP are as specified forbasic call.TABLE 3-3/Q.
37、81INFORM 3 contentsMand. MandatoryOpt. OptionalNote 1 This information flow is included only in the case that FE1 provides the information.Note 2 No number information is provided in the case that the CLIR supplementary service appliesand no bilateral agreement exists between the networks for the ha
38、ndling of restricted information.Note 3 In the case of the supplementary service Private Numbering Plan (PNP), other types ofnumber may be required and will be specified in the PNP-Recommendation.Parameter Allowed value Req. ind.Number information Numbering plan identification Type of number Number
39、digits Sub-addressISDN numberPrivate Numbering PlanNational numberInternational number(Note 3)Mand.Mand.Mand.Mand.Opt. (Note 1)Presentation indicator (PI) Presentation allowedPresentation restrictedNumber not availableMand.(Note 2)Screening indicator (SI) Network provided numberUser provided number,
40、verified and passed.User provided number,not screenedMand.Recommendation Q.81 93.7.2.4 Relationship rd3.7.2.4.1 Contents of INFORM 4The contents of the INFORM 4 are shown in Table 3-4/Q.81. The contents for SETUP are as specified forbasic call.TABLE 3-4/Q.81INFORM 4 contentsMand. MandatoryOpt. Optio
41、nalNote 1 This information flow is included only in the case that FE1 provides the information.Note 2 No number information is provided in the case that the CLIR supplementary service applies.Note 3 In the case of the supplementary service Private Numbering Plan (PNP), other types ofnumber may be re
42、quired and will be specified in the PNP-Recommendation.Parameter Allowed value Req. ind.Number information Numbering plan identification Type of number Number digits Sub-addressISDN numberPrivate Numbering PlanNational numberInternational number(Note 3)Mand.Mand.Mand.Mand.Opt. (Note 1)Presentation i
43、ndicator (PI) Presentation allowedPresentation restrictedNumber not availableMand.(Note 2)Screening indicator (SI) Network provided numberUser provided number,verified and passed.User provided number,not screenedMand.10 Recommendation Q.813.8 SDL diagrams for functional entities915916917918915910911
44、T1126261-91910FE2FIGURE 3-4/Q.81Specialarrangement?See Note 1Provide a completenational orinternationalISDN number?CLIRinvoked?Include presentationindicatorSee Note 4See Note 2See Note 3INFORM 1req. ind.YesNoNoYesNote 1 Provide a -partial, or -subscriber, or -national, or -international number accor
45、ding to originating users request.Note 3 In the case of the supplementary service Private Numbering Plan (PNP), other types of number may be required and will be specified in the PNP-Recommendation.Note 4 This information is applicable to CLIR temporary mode.Note 2 Set type of numbers national or in
46、ternational number and set numbering plan identification ISDN number or Private Numbering Plan.CLIP and CLIR FE1Recommendation Q.81 11CLI1CLI2T1129460-91CLIP/CLIR1FIGURE 3-5/Q.81NoteNoteNote CLI1 and CLI2 break the basic call transition:Basic call hooks for FE1 during FEA211 (see Figure 2-13 (sheet
47、1 of 5) of Recommendation Q.71 5), immediately following the task “Process service request connect”. CLI2 reconnects at the same point; after sending SETUP req. ind. (see Figure 2-14 (sheet 2 of 7) of Recommendation Q.71 5). CLI2 reconnects at the same point; or during FEA221 (see Figure 2-14 (sheet
48、 1 of 7) of Recommendation Q.71 5), immediately following the “Yes” branch of the decision “Successful?”. CLI2 reconnects at the same point.12 Recommendation Q.81920920920922925926921924 92412 2T1126271-91FE1921INFORM 1req. ind.Callingid. suppl. bythe user?YesNoYesNoSpecialarrangement?Not OKOKVerifi
49、cationof calling lineidentityCalling number =default numberSET SI =user providedverified and passedSET SI =user providednot screenedSET SI =network providedNoteNote Complete partial number or subscriber number to a national number. Put the number into the format used in the current ISDN. Set type of number and numbering plan identificator.CLIP and CLIR FE2FIGURE 3-6/Q.81 (sheet 1 of 2)Recommendation Q.81
