1、CCITT RECMN*I-253. 3*i(REV*iL) 92 D 4862593 0573827 Tb7 = INTERNATIONAL TELECOMMUNICATION UNION CCITT 1.251.3 (rev.1) THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE INTEGRATED SERVICES DIGITAL NETWORK (ISDN) GENERAL STRUCTURE AND SERVICE CAPABILITIES CALLING LINE IDENTIFICATION PRE
2、SENTATION Recommendation 1.251.3 (rev.1) Geneva, 1992 CCITT RECMN*Im25L. 3*:(REV%L) 92 W 486259L 0573828 9T3 W INTERNATIONAL TELECOMMUNICATION UNION CCITT 1.251 m3 (rv.1) THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE INTEGRATED SERVICES DIGITAL NETWORK (ISDN) GENERAL STRUCTURE AND
3、 SERVICE CAPABILITIES CALLING LINE IDENTIFICATION PRESENTATION Recommendation 1.251.3 (rev.1) Geneva, 1992 FOREWORD The CCIT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the International Telecommunication Union (ITU). CCITT is responsible for studying t
4、echnical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The Plenary Assembly of CCIIT which meets every four years, establishes the topics for study and approves Recommendations prepared by its Study Groups. T
5、he approval of Recommendations by the members of CCIT between Plenary Assemblies is covered by the procedure laid down in CCm Resolution No. 2 (Melbourne, 1988). Recommendation 1.251.3 was prepared by Study Group I and was approved under the Resolution No. 2 procedure on the 4th of August 1992. CCIT
6、 NOTE In this Recommendation, the expression “Administration” 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 means,
7、electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. CCITT RECNN*I.253. 3*(REV*3) 92 W 4862593 0573830 553 m Recommendation 1.251.3 CALLING LINE IDENTIFICATION PRESENTATION (revised 1992) 1 Defini tion Calling Line Identification Presentation is
8、 a supplementary service offered to the called party which provides the calling partys ISDN-number, possibly with sub-address information, to the called party. 2 Description 2.1 General description When Calling Line Identification Presentation (CLIP) is applicable and activated, the network provides
9、 the called party with the number of the calling party at call Set-up on all incoming calls. The calling party number may be accompanied by a sub-address. The network should be capable of transmitting at least 15 digits maximum length of an integrated services digital network (ISDN) number. In addit
10、ion, if provided by the calling party, the network should be capable of transmitting a sub-address. The network to which the calling party belongs should attempt to ensure that enough digits are transmitted to enable the called party to return the call, based on the calling number presented. 2.2 Spe
11、c terminology Partial number: a part of an ISDN number which is relevant to a selection process between addressable entities beyond the network boundary. The partial number digits and the partial number length are subject to subscription to the relevant supplementary services Direct-Dialling-In DI)
12、or Multiple Subscriber Number (MSN). 2.3 Qualcations on the applicability to telecommunication services This supplementary service is applicable to all telecommunication services. It is to be noted that in the telematic services an exchange of terminal identification (ID) occurs at a higher layer su
13、bsequent to a successful call establishment. For telematic services this supplementary service shall consist only of the access number of the calling party and this shall be provided by the network. For other non-voice services this supplementary service is for further study, The presentation of the
14、 calling partys ISDN-number by telematic terminals and by other non-voice terminals is for further study. Recommendation 1.251.3 1 _ -_ - CCITT RECMN*I.253. 3*i(REV*3) 92 W 48b2591 0573833 498 M 3 Procedures 3.1 Provisiodwithdrawal CLIP may be provided on a subscription basis or be generally availab
15、le. CLIP may be withdrawn at the request of the subscriber or by the network provider for adminisirative reasons. 3.2 Normal procedures 3.2.1 A ctivatioddeactivatiodregistration network for this supplementary service. CLIP is activated on provision and deactivated on withdrawal. No information needs
16、 to be registered with the 3.2.2 Invocation and operation The number presented shall unambiguously identify the access of the calling party. The number presented is i) completely provided by the network; ii) completely provided by the calling party; or Ui) partially provided by the cailing party, in
17、 the form of a partial number, with the rest provided by the network (e.g. the access number is provided by the network and the additional digits to make the number complete by the calling party). either: Some networks may provide additional information (see Annex A). Where either the complete calli
18、ng number, or part of the calling number is initially provided by the calling party, the network may check its validity, unless a special connection arrangement exists between the customer and the public network (see 0 3.2.2.1). If this check is successful, then this number is used by the network. F
19、or complete calling number, this validity check may determine whether the number is allocated to the access; for partially provided numbers this check may, for example, determine whether the digits are within the allocated range. 3.2.2.1 Special connection arrangement Where the public network operat
20、or has confidence that the correct information will be provided by the calling customer, a special connection arrangement between the customer and the public network e.g. for calls which originate from another private automatic branch exchange (PABX) in a private network can be offered. Note that th
21、e details of such a special connection arrangement are beyond the scope of this Recommendation. When this special arrangement applies, a full national or international ISDN number will be passed to the public network as the calling party identity. No screening will be required, and the public networ
22、k will add country codes as required when crossing international boundaries, etc. 3.3 Exceptional procedures 3.3.1 Activatioddeactivatiodregistration None identified. 3.3.2 Invocation and operation number as the number of the calling party. If the network check on a calling party provided number is
23、unsuccessful, the network will use the default There are two cases where the calling party number is not presented to the called party: i) when the calling party has an arrangement (see definition of Calling Line Identification Restriction) whereby presentation of his number is not allowed; and ii)
24、when the calling party number is not available, e.g. due to interworking with the analogue public switched telephone network (PSTN). 2 Recommendation 1251.3 CCITT RECNNaI.251. 3*:(REV*1) 72 = Y862571 0573832 324 = In such cases no number is presented to the called party, but he shall receive an indi
25、cation that the number of the calling party is unavailable. In case i), the user wiii be given an indication that the presentation of number is restricted. In case U), the user will be given an indication that the number is not available, for example because of interworking. 3.4 Alternative procedur
26、es 3.4.1 Activatioddeactivatiodregistration None identified. 3.4.2 Invocation and operation In some cases where a calling party has an arrangement such that presentation of his number is not allowed, there may be certain categories of called party that have the ability to override this restriction a
27、nd have the calling number presented. This function is a national option. Problems may occur when the calling party does not belong to the same network as the called party and in the ding partys network the override category does not exist, while in the called partys network it does. A problem occur
28、s when a calling party who restricts presentation and assumes that his number is never presented, makes a call to a called party who is in the override category. The cases where the override category is applied is a national matter. Depending on bilateral agreement about the application of the overr
29、ide category in country B, and the “presentation not allowed” arrangement of the calkg party in country A, country A may or may not deliver the calling line identification to country B. Agreements are also needed with any transit network. 4 Network capabiiities for charging This Recommendation does
30、not cover charging principles. Future Recommendations in the D-Series are expected to contain that information. It shall be possible to charge the subscriber accurately for the service. 5 Interworking requirements On calls incoming from some non-ISDN networks, the calling number may be delivered to
31、the destination ISDN without the ability to indicate whether presentation is allowed or not. How the ISDN should behave in this case is for further study. From some other non-ISDN networks, no calling party number may be available to the ISDN and therefore, the calling party number cannot be given t
32、o the called party who has been provided with CLIP. In this situation, a “number unavailable” indication, is given to the called party. If a “number unavailable” indication is given to the called party, the called party will be clearly informed that the calling party number is not available as a res
33、ult of network interworking. As a national option, the originating network shall have the possibility to restrict any information identifying the calling party from being forwarded to another network. If a destination network receives a calling party ISDN number without any indication of presentatio
34、n allowed or restricted, the destination network (host network) will act according to its own rules and regulations. Recommendation 1.251.3 3 6 Interaction with other supplementary services 6.1 Call Waiting No impact, i.e. neither supplementary service affects the operation of the other supplementar
35、y service. If the called user(s) at B is (are) given a cail waiting indication, and has (have) subscribed to the CLIP service, then the calling line identification shall be presented to the users at B at the time the call waiting indication is given. 6.2 6,3 6.4 6.5 6.6 Call Tramfer No impact, i.e.
36、neither supplementary service shall affect the operation of the other supplementary service. Connected Line Identification Presentation No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Connected Line Identification Restriction No impact, i.e. ne
37、ither supplementary service affects the operation of the other supplementary service. Calling Line Identification Presentation Not applicable. Calling Line Zdentflcation Restriction The calling line identification will not be presented if the calling user has an arrangement to inhibit the presentati
38、on of his number to the called party. The only occasion when a user subscribing to CLIP can take precedence over Calling Line Idenuication Restriction (CLIR) is when the user has an override category. This is a national option. 6.7 Closed User Group No impact, i.e. neither supplementary service affe
39、cts the operation of the other supplementary service. 6.8 Conference Calling Any party that has subscribed to CLIP will receive the calling line identification of a conference controller when: - - the party is to be included as a “new party” during the invocation of a conference call; or the party i
40、s being added to an existing conference call. 6.9 Direct-Dialling-In No impact at the calling partys user-network interface, except that the network may be supplied with a i) at that interface, in which case a partial or full calling party number may be supplied and may be subject to screening by th
41、e network; or ii) (subject to the existence of a special arrangement for not screening) at that interface or at another interface to which the same customers equipment (e.g. a private network) is attached, in which case a full (national or international) number may be supplied. cailing party number
42、as a result of DDI applying either: 4 Recommendation 1.251.3 CCITT RECMN*I.251. 3*:(REV*1) 72 W 4862571 0573834 IT7 At the called partys interface there is no impact, i.e. neither supplementary service afTects the operation of the other supplementary service. 6.10 Call diversion services If an incom
43、ing call to the party to which CLIP has been provided has already been forwarded, then the calling partys number should be the number of the original calling party. 6.10.1 Call Forwarding Busy Called user: if subscribed to, the called user can receive the calling line identification of all calls whi
44、ch have been forwarded. Forwarded-to users, who have subscribed to CLIP, may receive the calling users number if the calling user has not subscribedinvoked CLIR. 6.10.2 Call Forwarding No Reply Called user: if subscribed to, the called user can receive the calling line identification of all calls wh
45、ich have been forwarded. Forwarded-to users, who have subscribed to CLIP may receive the calling users number if the calling user has not subscribed/invoked CLIR. 6.10.3 Call Forwarding Unconditional Called user: if subscribed to, the called user can receive the calling line identification of all ca
46、lls which have been forwarded. Forwarded-to users, who have subscribed to CLIP may receive the calling users number if the calling user has not subscribedinvoked CLR. 6.10.4 Call Deflection Same as Call Forwarding Unconditional (see Q 6.10.3). 6.1 1 Line Hunting No impact, i.e. neither supplementary
47、 service affects the operation of the other supplementary service. The Line Hunting service occurs before CLIP. The Line Hunting service would first provide a selection of an interface for presentation of a call. Once the service selects an interface, normal call processing would occur including the
48、 presentation of the calling partys number to a selected interface who has subscribed to CLIP. 6.12 Three-Party Service No impact, Le. neither supplementary service affects the operation of the other supplementary service. 6.13 User-to-User Signalling No impact, i.e. neither supplementary service af
49、fects the operation of the other supplementary service. Recommendation 1.251.3 5 - - - - - CCITT RECNN*I.25Lm 3*:(REV*L) 92 = YBb259L 0573835 033 9 6.14 Multiple Subscriber Number If MSN is subscribed to by the calling patty, then this patty may provide the appropriate calling party MSN digits, or the full ISDN number on outgoing calls. If no arrangement has been made with the calling subscriber, the network shall check the user provided calling party number information for validity on the corresponding access. If the check fails, or if no calling number infor
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