1、INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU 1.251.5 (02/95) INTEGRATED SERVICES DIGITAL NETWORK (ISDN) SERVICE CAPABILITIES CONNECTED LINE IDENTIFICATION PRESENTATION (COLP) ITU-T Recommendation 1.251.5 (Previously “CCIlT Recommendation”) FOREWORD The
2、ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (ITU). The IT-T is responsible for studying technical, operating and tariff questions and issuing Recommen- dations on them with a view to standardizing telecommunications on a worldwid
3、e basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produceRecornmendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by th
4、e procedure laid down in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). ITU-T Recommendation 1.251.5 was revised by IT-T Study Group 1 (1993-1996) and was approved under the WTSC Resolution No. 1 procedure on the 21st of February 1995. NOTE In this Recommendation, the expression “Administration
5、” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. O ITU 1995 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, with
6、out permission in writing from the ITU. ITU-T RECMN*I*253 . 5 95 4862593 Ob00375 123 1 2 3 4 5 6 7 CONTENTS Definition Description . 2.1 General description . 2.2 Specific terminology . 2.3 Qualifications on the applicability to telecommunication services . Procedures 3.1 Provisiodwithdrawal . 3.2 N
7、ormal procedures 3.3 Exceptional procedures . 3.4 Alternative procedures Network capabilities for charging Interworking considerations . 5.1 Interworking with non-ISDN networks 5.2 Interworking with private ISDN . Interaction with other supplementary services . 6.1 Advice of charge services (AOC) .
8、6.2 Call Hold (HOLD) 6.3 Call transfer services (ECT. NCT) . 6.4 Call Waiting (CW) 6.5 Closed User Group (CUG) . 6.6 Completion of calls services 6.7 Conference services 6.8 Diversion services . 6.9 Direct-Dialling-In DI) 6.10 In-Call Modification (IM) . 6.1 1 ISDN Freephone (IFS) 6.12 Line Hunting
9、(LH) Malicious Call Identification (MCID) Multi-level Precedence and Preemption OMLPP) . 6.13 6.14 6.15 Multiple Subscriber Number (MSN) 6.16 Name identification services . 6.17 Number identification services . 6.18 Outgoing Call Barring (OCB) . 6.19 Reverse Charging (REV) 6.20 Sub-addressing (SUB)
10、6.21 Terminal Portability (TP) 6.22 User-to-User Signalling (UUS) Dynamic description Page 1 1 1 1 1 1 1 1 2 2 3 3 3 3 3 3 3 3 4 4 4 4 4 5 5 5 5 5 6 6 6 6 6 6 6 6 6 6 Recommendation 1.251.5 (02/95) 1 SUMMARY Connected Line Identification Presentation (COLP) is a supplementary service offered to the
11、calling party which provides the connected partys ISDN number possibly with sub-address information to the calling party. ii Recommendation 1.251.5 (02/95) Recommendation 1.251.5 CONNECTED LINE IDENTIFICATION PRESENTATION (COLP) (revised in 1994) 1 Defini tion Connected Line Identification Presentat
12、ion (COLP) is a supplementary service offered to the calling party which provides the connected partys ISDN number possibly with sub-address information to the calling party. 2 Description 2.1 General description - When COLP is applicable and invoked, the network provides the calling party with the
13、number of the connected party when the connected party answers the incoming call. The connected party number may be accompanied by a sub-address. call is for further study. NOTE - The possibility of enhancing this service to provide the called party number before the called party answers the 2.2 Spe
14、cific 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 subscriptions to the relevant supplementary service (DDI or MSN). 2.3 T
15、his supplementary service is applicable to all telecommunication services. Qualifications on the applicability to telecommunication services 3 Procedures 3.1 Provisionlwithdrawal The COLP supplementary service may be provided on a subscription basis or be generally available. COLP may be withdrawn a
16、t the request of the subscribers or by the network provider for administrative reasons. 3.2 Normal procedures 3.2.1 Activatioddeactivatiodregistration COLP is activated on provision and deactivated on withdrawal. No information needs to be registered with the network for this supplementary service.
17、3.2.2 Invocation and operation The network shall automatically invoke the COLP supplementary service on each outgoing call made by the calling user. Recommendation 1.251.5 (02/95) 1 ITU-T RECMN*I.253- 5 75 = 4862593 Ob00178 932 The number presented shall unambiguously identify the access of the conn
18、ected party. The number presented is either: i) completely provided by the network; ii) completely provided by the connected party; or iii) partially provided by the connected party as a partial number, and the rest provided by the network (e.g. the access number is provided by the network and the a
19、dditional digits to make the number complete by the connected party). Where either the complete connected number, or part of the connected number is initially provided by the connected party, the network may check its validity unless a special connection arrangement exists between the customer and t
20、he public network (see below). If this check is successful, then this number shall be marked as ?user provided, verified and passed? and it will be used by the network. If the connected party does not provide any number, the public ISDN shall enter a default number marked as ?network provided?. Spec
21、ial connection arrangement Where the public network operator has confidence that the correct information will be provided by the connected customer, a special connection arrangement between the customer an the, public network (e.g. for calls which are forwarded within a private network) can be offer
22、ed. Note that the details of such a special connection arrangement are beyond the scope of this Recommendation. When this special arrangement applies, a full national ISDN or international number will be passed to the public network as the connected party identity. No screening will be required, and
23、 the number shall be marked as ?user provided, not screened?. The public network 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 If the network check on
24、 the connected party provided number is unsuccessful, the network default number will be used instead and it shall be marked as ?network provided?. There are two cases where the connected party number is not presented to the calling party: i) ii) when the connected party has an arrangement whereby p
25、resentation of his number is not allowed (see definition of Connected Line Identification Restriction); or when the connected party number is not available e.g. due to interworking with the analogue telephone network (PSTN). In such cases the calling party shall be given a number unavailable indicat
26、ion. In case i), the user will be given an indication that the presentation of the connected party number is restricted. In case ii), the user will be given an indication that interworking has occurred. 3.4 Alternative procedures 3.4.1 Activatioddeactivatiodregistration None identified. 3.4.2 Invoca
27、tion and operation Problems may occur when the connected party does not belong to the same network as the calling party and in the connected party?s network the override category does not exist, while in the calling party?s network, it does exist. A problem occurs when a connected party who restrict
28、s presentation and assumes that his number is never presented, receives a call from a calling party who is in the override category. 2 Recommendation 1.251.5 (02/95) The cases where the override category is applied is a national matter. Depending on bilateral agreement about the application of the o
29、verride category in country A, and the presentation not allowed arrangement of the connected party in country B, country B may or may not deliver the connected line identification to country A. Agreements are also needed with any transit network. 4 Network capabilities for charging This Recommendati
30、on does 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 considerations NOTE - In interworking situations when information is passed to other networ
31、ks which do not support the requirements of this Recommendation, COLP information (e.g. when a special arrangement exists where “user provided, not screened” applies) could be discarded. - 5.1 Interworking with non-ISDN networks On calls destined to some non-ISDN networks, the connected number may b
32、e delivered to the originating ISDN without the ability to indicate whether presentation is allowed or not. How the ISDN should behave in this case is for further study. On calls destined to some non-ISDN networks, no connected party number may be available to the ISDN and therefore the connected pa
33、rty number cannot be given to the calling party who has COLP. In this situation a “number unavailable indication” is given to the calling party. 5.2 Interworking with private ISDN For a call which enters the private ISDN, the private ISDN shall perform its own screening function on the connected use
34、r provided information, after which the resulting number shall be given to the public ISDN in the form of an E.164 national or international ISDN number. This number shall be screened by the public ISDN unless a special arrangement has been made. (See 3.2.2.) If the private ISDN does not provide any
35、 number, or if the screening performed by the public ISDN is unsuccessful, the public ISDN shall enter a default number which shall be marked as “network provided”. Where the connected user is attached to a public ISDN and the calling user is attached to a private ISDN, the public ISDN shall forward
36、 the appropriate connected party ISDN number to the private ISDN. 6 Interaction with other supplementary services 6.1 Advice of charge services (AOC) No impact, Le. neither supplementary service affects the operation of the other supplementary service. 6.2 Call Hold (HOLD) No impact, Le. neither sup
37、plementary service affects the operation of the other supplementary service. 6.3 Call transfer services (ECT, NCT) Assume the situation where a user A has an established call with a user B and wishes to transfer this call with user B to a user C. Recommendation 1.251.5 (OY95) 3 Except in the case wh
38、ere user C prohibits the presentation of his number, user Cs number shall be presented: - To user B upon successful completion of the transfer to user C (independent of the type of transfer procedure invoked by user A) provided that user B has subscribed to COLP. To user A when user A is using norma
39、l or explicit transfer procedures and has subscribed to COLP. The connected partys number will not be presented to user A if user A invokes the single step Call Transfer procedure. NOTE - The connected number presentation may not be possible if interworking with a non-ISDN network is invoked in - th
40、e call transfer. 6.4 Cai1 Waiting (CW) No impact, i.e. neither supplementary service affects the operation of the other supplementary service. 6.5 Closed User Group (CUG) No impact, Le. neither supplementary service affects the operation of the other supplementary service. 6.6 Completion of calls se
41、rvices - 6.6.1 No impact, Le. neither supplementary service affects the operation of the other supplementary service. Completion of Calls on No Reply (CCNR) 6.6.2 No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Completion of Calls to Busy Subsc
42、ribers (CCBS) 6.7 Conference services 6.7.1 Conference Calling (CONF) A conference controller who has also subscribed to COLP should be presented with the connected partys number when that party is either part of the initial activation of the conference or is added as a new conferee to an existing c
43、onference. Conferees in an existing conference who have subscribed to COLP will not receive a new partys number whenever a conference controller adds a new party to the conference. 6.7.2 Three-Party Service (SPTY) No impact Le. neither supplementary service affects the operation of the other supplem
44、entary service. 6.8 Diversion services 6.8.1 Call Deflection (CD) Calling user notification of the diverted-to number is part of the diversion service and should not be considered to require an invocation of COLP by the calling user. If the served (diverting) user selects the option that the calling
45、 user is not notified of call deflection, then the calling user will receive no deflection notification. In addition, the calling user will not receive the connected users identity when the call is answered, unless the calling user has override capability. If the served (diverting) user selects the
46、option that the calling user is notified, but without the deflected-to number, then the calling user will not receive the connected users identity when the call is answered, unless the calling user has override capability. 6.8.2 Call Forwarding Busy (CFB) Calling user notification of the diverted-to
47、 number is part of the diversion service and should not be considered to require an invocation of COLP by the calling user. 4 Recommendation 1.251.5 (02/95) If the served (diverting) user selects the option that the calling user is not notified of call forwarding, then the calling user will receive
48、no forwarding notification. In addition, the calling user will not receive the connected users identity when the call is answered, unless the calling user has override capability. If the served (diverting) user selects the option that the calling user is notified, but without the forwarded-to-user n
49、umber, then the calling user will not receive the connected users identity when the call is answered, unless the calling user has ovemde capability. 6.8.3 Calling user notification of the diverted-to number is part of the diversion service and should not be considered to require an invocation of COLP by the calling user. If the served (diverting) user selects the option that the calling user is not notified of call forwarding, then the calling user will receive no forwarding notification. In addition, the calling user will not receive the connected users identity when the
