1、INTERNATIONAL TELECOMMUNICATION UNION CCITT 1.251.4 (rev.1) THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE INTEGRATED SERVICES DIGITAL NETWORK (ISDN) GENERAL STRUCTURE AND SERVICE CAPABILITIES CALLING LINE IDENTIFICATION R ESTR I CTI O N Recommendation 1.251.4 (rev.1) Geneva, 1992
2、CCITT RECMNaI.251. 4*K(REV*1) 92 = 4862593 0573840 4TO W INTERNATIONAL TELECOMMUNICATION UNION CCITT 1.251.4 (rev.1) THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE INTEGRATED SERVICES DIGITAL NETWORK (ISDN) GENERAL STRUCTURE AND SERVICE CAPABILITIES CALLING LINE IDENTIFICATION REST
3、RICTION Recommendation 1.251 -4 (rev.1) I Geneva, 1992 - -_- - -_ CCITT RECflN*I.251- 4*i(REV*3) 92 W 4862593 0573843 337 FOREWORD The CC (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the International Telecommunication Union 0. CCI? is responsible for st
4、udying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The Plenary Assembly of CC which meets every four years, establishes the topics for study and approves Recommendations prepared by its Study Grou
5、ps. The approval of Recommendations by the members of CCI?iT between Plenary Assemblies is covered by the procedure laid down in CC Resolution No. 2 (Melbourne, 1988). Recommendation 1.251.4 was prepared by Study Group I and was approved under the Resolution No. 2 procedure on the 4th of August 1992
6、. CCIT NOTE In this Recommendation, the expression ?Adminitratiod is used for conciseness to indicate both a telecommunication Administration and a recognized private operating agency. O ITU 1992 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any mea
7、ns, electronic or mechanical, including photocopying and microfilm, without permission in writing from the RU. CCITT RECflN*I.251. 4*(REV*1) 92 = 4862591 0573842 273 Recommendation 1.251.4 Subscription option CALLING LINE IDENTWICATION RESTRICTION values (revised 1992) Default (only for temporary mo
8、de) 1 Definition Presentation restricted Presentation not restricted Calling Line Identification Restriction is a supplementary service offered to the calling party to restrict presentation of the cailing partys ISDN-number and sub-address to the called party. 2 Description 2.1 General description W
9、hen Caiiing Line Identification Restriction (CLIR) is applicable and activated, the originating node provides the destination node with a notification that the calling partys ISDN number and any sub-address information are not allowed to be presented to the called party. In this case no calling part
10、y number is included in the call offering to the called partys installation. Note - When CLIR is subscribed to, some network providers may not wish to send the originating identity of the calling customer to other network providers. 2.2 Specific terminology None identified. 2.3 Qualifications on the
11、 applicability to telecommunication services None identified, Le. this supplementary service is applicable to all telecommunication services. 3 Procedures 3.1 Provisiodwithdrawal CLIR can be provided on a subscription basis or be generally available. As a network provider option, CLlR can be offered
12、 with several subscription options. The options apply separately to each ISDN number. Subscription options are summarized below: CLIR mode Permanent (active for ali calls) Temporary (specified by user per can) Recommendation 1251.4 1 It is a network provider option to specify either or both of the a
13、bove options for all subscribers, for instance, in an exchange or network. 3.2 Nomal procedures 3.2.1 Activatoddeactivatiodregistration If subscribed to in the permanent mode, CLIR is always activated. If subscribed to on a temporary basis, CLIR is activated upon explicit request for the service, or
14、 on default, on a particular call and is deactivated after that call. 3.2.2 Invocation and operation If the called party subscribes to Calling Line Identification Presentation and the calling party has CLJR activated, the called party shall receive an indication that the presentation of the calling
15、party number is restricted. 3.3 Exceptional procedures 3.3.1 Activatioddeactivatiodregistration No exceptional procedures identified. 3.3.2 Invocation and operation No exceptional procedures identified. 3.4 Alternative procedures 3.4.1 A ctivatioddeactivatiodregistration No alternative procedures id
16、entified. 3.4.2 Invocation and operation Certain countries may define categories of subscribers that have the ability to override the presentation The ability to have such override category is a national matter. When a call originates in one ISDN and terminates in another ISDN and CLIR is applied, t
17、he rules and regulations of the destination network (the host network) should apply. For example, if the override category is not applicable in the originating network but it is in the destination network, a call with CLIR applied can still be overridden in the destination network, whenever informat
18、ion on the calling lhe is available for this network. restriction and have the calling partys ISDN number and any sub-address presented (e.g. the police). 4 Network capabilities for charging expected to contain that information. This Recommendation does not cover charging principles. Future Recommen
19、dations in the D-Series are It shall be possible to charge the subscriber accurately for the service. 5 Interworking requirements On calls to or via non-ISDNs, it cannot be assured that a CLIR indication can be canied to the destination network, As a national option, the originating network shall ha
20、ve the possibility to restrict any information identifying the calhg party fiom being forwarded to the destination network when CLIR is applicable. If a network receives a caiiing party ISDN number without any indication of presentation allowed or restricted, the destination network (the host networ
21、k) will act according to its rules and regulations. 2 Recommendation 1,251.4 6 Interaction with other supplementary services 6.1 Call Waiting No impact, Le. neither supplementary service affects the operation of the other supplementary service. Assume that a call from a user at C, who has subscribed
22、 to the CLIR service, invokes Call Waiting at a user(s) at B. The user(s) at B would receive a call waiting indication but would not receive the cailing user at C when the cali waiting indication is given. 6.2 Call Transfer Assume that a user A has an established call with user B and wishes to trans
23、fer this call with user B to user C. If user A has subscribed to CLIR, then user C shall not receive a calling number when user A invokes any call transfer procedure. If-user B has subscribed to CLIR, then user C shall not receive a calling number during the transfer of user B to user C. 6.3 Connect
24、ed Line Identification Presentation No impact, i.e. neither supplementary service affects the operation of the other supplementary service. 6.4 Connected Line Identcation Restriction No impact, Le. neither supplementary service affects the operation of the other supplementary service. 6.5 Calling Li
25、ne Identijkation Presentation The calling line identifications will not be presented if the calling user has an arrangement to inhibit the presentation of his number to the called party. The only occasion when a user subscribing to CLIP can take precedence over CLIR is when the user is in an overrid
26、e category. This is a national option. 6.6 6.7 6.8 6.9 Calling Line Identification Restriction Not applicable. Closed User Group No impact, Le. neither supplementary service affects the operation of the other supplementary service. Conference Call No impact, Le. neither supplementary service affects
27、 the operation of the other supplementary service. Direct-Dialling-In No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Recommendation 1.251.4 3 _ _- I CCITT RECMN*I*25L- 4*(REV*L) 92 W 48b259L 0573845 T82 6.10 Call diversion services 6.10.1 Call
28、 Forwarding Busy Calling user: when CL,IR is applicable and activated, the calling line identification will not be presented to the forward&-to user unless the forwarded-to user is in the override category. The latter is a national option. 6.10.2 Call Forwarding No Reply Calling user: when CLIR is a
29、pplicable and activated, the calling line identification WU not be presented to the forwarded-to user unless the forwarded-to user is in the override category. The latter is a national option. 6.10.3 Call Forwarding Unconditional Culling user: when CLIR is applicable and activated, the calhg line id
30、entification whi not be presented to the forwarded-to user unless the forwarded-to user is in the override category. The latter is a national option. 6.10.4 Call Deflection Calling user: when CLR is applicable and activate& the calling line identification will not be presented to the deflected-to-us
31、er unless the deflected-to-user is in the override category. The latter is a national option. 6.11 6.12 6.13 6.14 6.15 6.16 6.17 4 Line Hunting No impact, Le. neither supplementary service affects the operation of the other supplementary service. Three-Party Service No impact, i.e. neither supplemen
32、tary service affects the operation of the other supplementary service. User-to- User Signalling No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Multiple Subscriber Number No impact, Le, neither supplementary service affects the operation of the
33、 other supplementary service. Call Hold No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Advice of Charge No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Multi-level Precedence and Preempti
34、on No impact, Le. neither supplementary service affects the operation of the other supplementary service. Recommendation 1.251.4 6.18 6.19 6.20 6.21 6.22 7 CCITT RECMN*I.251. 4*(REV*1) 92 48b2591 0573846 919 Priority No impact, i.e. neither supplementary service affects the operation of the other su
35、pplementary service. Malicious Call Identpcation No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Outgoing Call Barring No impact, Le. neither supplementary service affects the operation of the other supplementary service. Reverse Charging No im
36、pact, i.e. neither supplementary service affects the operation of the other supplementary service. Sub-addressing No impact, i.e. neither supplementary service affects the operation of the other supplementafy service. Dynamic description The dynamic description for this service is shown in Figure lB.251.3. Recommendation 1.251.4 5
