1、INTERNATIONAL TELECOMMUN ICATION UNION ITU=T TELECOMMUN ICATION STANDARDIZATION SECTOR OF ITU 1.251.6 INTEGRATED SERVICES DIGITAL NETWORK (ISDN) SERVICE CAPABILITIES (02/95) CONNECTED LINE IDENTIFICATION RESTRICTION (COLR) ITU-T Recommendation 1.251 -6 (Previously “CCITT Recommendation”) ITU-T RECMN
2、*I-251. b 75 = 48b2591 Ob00185 O72 FOREWORD The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (ITU). The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommen- dations on them with a view
3、to standardizing telecommunications on a worldwide 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, produce Recommendations on these topics. The approval of Recommendat
4、ions by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). ITU-T Recommendation 1.251.6 was revised by ITU-T Study Group 1 (1993-1996) and was approved under the WTSC Resolution No. 1 procedure on the 21st February 1995. NOTE In this
5、 Recommendation, the expression “Administration” 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 mechani
6、cal, including photocopying and microfilm, without permission in writing from the ITU. CONTENTS 1 Definition . 2 Description . 2.1 General description . 2.2 Specific terminology . 2.3 Qualification on the applicability to telecommunication services 3 Procedures 3.1 Provisiorwithdrawal 3.2 Normal pro
7、cedures 3.3 Exceptional procedures . 3.4 Alternative procedures . 4 Network capabilities for charging 5 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 (AOC) 6.2 Call Hold
8、(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) 6.11 ISDN Freephone (IFS) 6.12 Line Hunting (LH) 6.13 Malic
9、ious Call Identification (MCID) 6.14 Multi-level Precedence and Preemption (MLPP) . 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) 6.21 Terminal
10、 Portability (TI?) 6.22 User-to-User Signalling (UUS) 7 Dynamic description 6 Recommendation 1.251.6 (02/95) Page 1 1 1 1 1 1 1 2 2 2 2 2 3 3 3 3 3 3 3 3 3 4 4 5 5 5 5 5 5 5 5 5 6 6 6 6 6 6 1 SUMMARY Connected Line Identification Restriction (COLR) is a supplementary service offered to the connected
11、 party to restrict presentation of the connected partys ISDN number and sub-address information to the calling party. 11 Recommendation 1.251.6 (02/95) Recommendation 1.251.6 Subscription option COLR mode CONNECTED LINE IDENTIFICATION RESTRICTION (COLR) (revised in 1994) Values - Permanent (presenta
12、tion restricted for ail calls) 1 Definition Default (only for temporary mode) Connected Line Identification Restriction (COLR) is a supplementary service offered to the connected party to restrict presentation of the connected partys ISDN number and sub-address information to the calling party. - Te
13、mporary (specified by user per call) - Presentation restricted - Presentation not restricted 2 Description 2.1 General description When COLR is applicable and invoked, the destination node provides the oiiginating node with a notification that the connected partys ISDN number and any sub-address inf
14、ormation is not allowed to be presented to the calling party. In this case no connected party number is included in the call connected information to the calling party. NOTE - When COLR is subscribed to, some network providers may not wish to send the identity of the connected customer to other netw
15、ork providers. .- 2.2 Specific terminology None identified. 2.3 Qualification on the applicability to telecommunication services None identified, Le. this supplementary service is applicable to all telecommunication services. Certain countries may define categories of subscribers that have the abili
16、ty to override the presentation restriction and have the connected partys ISDN number and any sub-address presented (e.g. the police). The ability to have such an override option is a national matter. 3 Procedures 3.1 Provisiodwithdrawal COLR can be provided on a subscription basis or be generally a
17、vailable. As a network provider option, COLR can be offered with the following subscription option. NOTE - If COLR permanent mode is provided generally, all connected numbers will be restricted for presentation. Recommendation 1.251.6 (02/95) 1 3.2 Normal procedures 3.2.1 Activatioddeactivatiodregis
18、tration The COLR supplementary service shall be activated on provision and deactivated on withdrawal. This supplementary service requires no registration. 3.2.2 Invocation and operation If the called party has subscribed to the COLR supplementary service in the permanent mode, then the network shall
19、 automatically invoke the COLR supplementary service for each incoming call. If the called party has subscribed to the COLR supplementary service in the temporary mode with default value “presentation restricted”, then the network shall automatically invoke the COLR Supplementary service for each in
20、coming call unless the default value is overridden by subscriber request at the time of answer. If the called party has subscribed to the COLR supplementary service in the temporary mode with default value “presentation not restricted”, then the network shall only invoke the COLR supplementary servi
21、ce if requested by the subscriber on answer. If the calling party subscribes to Connected Line Identification Presentation and the connected party had COLR activated, the calling party shall receive an indication that the presentation of the connected party number is restricted. - 3.3 Exceptional pr
22、ocedures 3.3.1 Activatioddeactivatiodregistration No exceptional procedures identified. 3.3.2 Invocation and operation No exceptional procedures identified. 3.4 Alternative procedures No alternative procedures identified. 4 Network capabilities for charging This Recommendation does not cover chargin
23、g 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 When a call originates in one ISDN and terminates in another ISDN and COLR is applied, the rules and
24、regulations of the destination network (the host network) should apply. For calls between public ISDNs, when the COLR supplementary service is invoked, the destination network shall provide the originating network with a notification that the ISDN number of the connected party and the sub-address in
25、formation (if any) is not allowed to be presented to the calling party. NOTES 1 When the COLR supplementary service is invoked, some network providers may not send the connected line identity It is assumed that a network able to carry a connected line identity is also able to carry the connected lin
26、e restriction to other network providers. indication. 2 2 Recommendation 1.251.6 (02/95) ITU-T RECMN*I=25L- b 95 4862591 ObOOLO 43T m 5.1 Interworking with non-ISDN networks On calls to or via non-ISDNs, it cannot be assured that a COLR indication can be carried to the originating network. As a netw
27、ork option the destination network shall have the possibility to restrict any information identifying the connected party from being returned to the originating network when COLR is applicable. If a network receives a connected party ISDN number without any indication of presentation allowed or rest
28、ricted, the originating network (the host network) will act according to its rules and regulations. 5.2 Interworking with private ISDN On calls from the private ISDN to the public ISDN, the public ISDN can restrict any information identifying the connected party from being sent to the private ISDN w
29、hen the COLR supplementary service has been invoked. On calls from the public ISDN, the private ISDN can indicate that the COLR supplementary service has been invoked. 6 Interaction with other supplementary services 6.1 Advice of Charge (AOC) No impact, i.e. neither supplementary service affects the
30、 operation of the other supplementary service. 6.2 Call Hold (HOLD) No impact, i.e. neither supplementary service affects the operation of the other supplementary service. 6.3 Call transfer services (ECT, NCT) Assume that user A has an established call with user B and wishes to transfer this call wi
31、th user B to a user C. If user C has subscribed to COLR, then neither user A nor user B shall receive the connected number when user A invokes any call transfer procedure. 6.4 Call Waiting (CW) No impact, Le. neither supplementary service affects the operation of the other supplementary service. Ass
32、ume that a call from a user C, invokes call waiting at user B, who has subscribed to the COLR service. User B would receive a call waiting indication but would not have his number returned when the call waiting indication is given. 6.5 Closed User Group (CUG) No impact, i.e. neither supplementary se
33、rvice affects the operation of the other supplementary service. 6.6 Completion of calls services 6.6.1 No impact, i.e. neither supplementary service affects the operation of the other supplementary service. 6.6.2 No impact, i.e. neither supplementary service affects the operation of the other supple
34、mentary service. Completion of Calls on No Reply (CCNR) Completion of Calls to Busy Subscribers (CCBS) Recommendation 1.251.6 (02/95) 3 ITU-T RECMN*I*25L. b 95 4862573 ObOO19L 376 6.7 Conference services 6.7.1 Conference Calling (CONF) No impact, i.e. neither supplementary service affects the operat
35、ion of the other supplementary service. 6.7.2 Three-Party Service (3PTY) No impact, i.e. neither supplementary service affects the operation of the other supplementary service. 6.8 Diversion services 6.8.1 Call Deflection (CD) If a deflected-to user subscribes to COLR “permanent mode”, then the defl
36、ected-to users number shall not be provided with the notification that the call has been deflected. If a deflected-to user subscribes to COLR “temporary mode”, the prvision of the deflected-to users number to the calling user shall not be allowed during the alerting conditions of the call. The defle
37、cted-to users connected number may still be provided on answer, based on COLR temporary mode operation. In each of the above situations, a calling user that subscribes to COLP and having override capability shall not be able to receive the deflected-to user number as part of the diverting notificati
38、on information, but can invoke COLP in order to receive the connected line identity when the call is answered. 6.8.2 Cd Forwarding Busy (CFB) If a forwarded-to user subscribes to COLR “permanent mode”, then the forwarded-to users number shall not be provided with the notification that the call has b
39、een forwarded. If the forwarded-to user subscribes to COLR “temporary mode”, the provision of the forwarded-to-users number to the calling user shall not be allowed during the alerting condition of the call. The forwarded-to-users connected number may still be provided on answer based on COLR tempor
40、ary mode operation. In each of the above situations, a calling user that subscribes to COLP and having ovemde capability shall not be able to receive the forwarded-to user number as part of the diverting notification information, but can invoke COLP in order to receive the connected line identity wh
41、en the call is answered. 6.8.3 Call Forwarding No Reply (CFNR) If a forwarded-to user subscribes to COLR “permanent mode”, then the forwarded-to users number shall not be provided with the notification that the call has been forwarded. If the forwarded-to user subscribes to COLR “temporary mode”, th
42、e provision of the forwarded-to-users number to the calling user shall not be allowed during the alerting condition of the call. The forwarded-to-users connected number may still be provided on answer based on COLR temporary mode operation. In each of the above situations, a calling user that subscr
43、ibes to COLP and having override capability shall not be able to receive the forwarded-to user number as part of the diverting notification information, but can invoke COLP in order to receive the connected line identity when the call is answered. 6.8.4 Call Forwarding Unconditional (CFU) If a forwa
44、rded-to user subscriber to COLR “permanent mode”, then the forwarded-to users number shall not be provided with the notification that the call has been forwarded. If the forwarded-to user subscribes to COLR “temporary mode”, the provision of the forwarded-to-users number to the calling user shall no
45、t be allowed during the alerting condition of the call. The forwarded-to-users connected number may still be provided on answer based on COLR temporary mode operation. 4 Recommendation 1.251.6 (Oms) ITU-T RECMN*I*25L. b 95 4862593 Ob00192 202 In each of the above situations, a calling user that subs
46、cribes to COLP and having ovemde capability shall not be able to receive the forwarded-to user number as part of the diverting notification information, but can invoke COLP in order to receive the connected line identity when the call is answered. 6.9 Direct-Dialling-In (DDI) No impact, i.e. neither
47、 supplementary service affects the operation of the other supplementary service. 6.10 In-call Modification (IM) The connected user?s identity of the second terminal shall not be presented to the calling user after the incall modification has occurred. 6.11 ISDN Freephone (IFS) No impact, i.e. neithe
48、r supplementary service affects the operation of the other supplementary service. 6.12 Line Hunting (LH) - If the connected user supplies a number, then the COLR supplementary service subscribed to the number that is sent to the calling user shall apply. If a direct dialling-in number is sent, the C
49、OLR supplementary service subscribed to that hunt group number shall apply. If the connected user does not supply any number, then the COLR supplementary service subscribed to that hunt group number applies. 6.13 Malicious Call Identification (MCID) No impact, i.e. neither supplementary service affects the operation of the other supplementary service. 6.14 No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Multi-level Precedence and Preemption (MLPP) 6.15 Multiple Subscriber Number (MSN) No impact, i.e. neither supplemen
