1、CCITT RECMN*I.253. 2*(REV*3) 92 W 4862591 0573839 990 W INTERNATIONAL TELECOMMUNICATION UNION CCITT 1.251.2 (rv.1) THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE INTEGRATED SERVICES DIGITAL NETWORK (ISDN) GENERAL STRUCTURE AND SERVICE CAPABILITIES MULTIPLE SUBSCRIBER NUMBER Recomme
2、ndation 1.251.2 (rev.1) Geneva, 1992 * CCITT RECVN*I.251. 2*(REV*l) 92 W 4862591 0573820 602 INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE 1.251.2 (rev.1) INTEGRATED SERVICES DIGITAL NETWORK (ISDN) GENERAL STRUCTURE AND SERVICE CAPABILIT
3、IES MULTIPLE SUBSCRIBER NUMBER Recommendation 1.251.2 (rev.1) Geneva, 1992 FOREWORD The CCT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the International Telecommunication Union (IT). CCIIT is responsible for studying technical, operating and tariff que
4、stions 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. The approval of Recommendations by
5、the members of CCI“ between Plenary Assemblies is covered by the procedure laid down in CCT Resolution No. 2 (Melbourne, 1988). Recommendation 1.251.2 was prepared by Study Group I and was approved under the Resolution No. 2 procedure on the 4th of August 1992. CCJT NOTE In this Recommendation, the
6、expression “Administration“ is used for conciseness to indicate both a telecommunication Administration and a recognized private operating agency. O IT 1992 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including
7、 photocopying and microfilm, without permission in writing from the ITU. CCITT RECMN*I.251. 2*(REV*1) 92 = 4862591 0573822 485 Recommendation 1.251.2 MULTIPLE SUBSCRIBER NUMBER (revised 1992) 1 Definition Multiple Subscriber Number provides the possibility for assigning multiple integrated services
8、digital network numbers to a single interface. For example, this service: 1) allows dialling from a line connected to a public network directly to terminals connected to a basic access which has subscribed to Multiple Subscriber Number (e.g. in a passive bus configuration); enables the network to de
9、termine which ISDN number is applicable on originating calls (e.g. for charging purposes, for notification to the called party and appiication for supplementary services). 2) It is considered: - that some Administrations may not have knowledge or control over what is connected to the basic access, e
10、.g. an network termination 2 (NT2) or passive bus; that Administration have differing numbering methods; - - that common international terminal specifications are desired. 2 Description 2.1 General description The Multiple Subscriber Number (MSN) supplementary service provides the possibility for as
11、signing multiple numbers (not necessarily consecutive) to a single public or private interface. This enables the selection of one or multiple distinct terminals attached to the same interface. The service provider shall fix the length of the numbers to be transmitted to the users installation. They
12、may comprise the least significant digit up to the full integrated services digital network (ISDN) number (see Recommendation E.164). The digit(s) significant for terminal differentiation shall be an integral part of the ISDN numbering scheme. Note I - Within a private ISDN, multiple subscriber numb
13、er digits may be different from the digits of the public ISDN number. This additional possibility, if provided, has no impact on the public ISDN. Note 2 - More than one multiple subscriber number may be assigned to one terminal. Note 3 - The actual method of relating the ISDN number to a particular
14、terminai is a matter of national implementation. 2.2 Specific terminology None. 2.3 QualiJications on the applicability to telecommunication services No restriction to either circuit or packet mode. Recommendation 1.251.2 1 3 Procedures 3.1 Provision/withrawal The service shall be provided after pre
15、-arrangement with the service provider. The service provider shall allocate a set of ISDN numbers (not necessarily consecutive). At the option of the service provider, one of these numbers may be designated by the MSN subscriber as the default number for the interface. At the option of the service p
16、rovider, the user may specify a mapping arrangement between ISDN number and MSN digit(s). 3.2 Normal procedures 3.2.1 Activatioddeactivatiodregistration Activation through subscription. 3.2.2 Invocation and operation The destination number sent by the calling user will be analyzed in the network. If
17、 the called user subscribes i) identicai to that last digit(s) of the ISDN number; or ii) generated by the network on the basis of a mapping process between ISDN number(s) and MSN digit(s). Terminais compatible to the MSN service will react on a call as follows: - to this Supplementary service, the
18、network sends the available part of the ISDN number or at least the relating digit(s): if MSN digit(s) equal to their own preadjusted identity is (are) presented, they react to it in a predetermined way; if there is a Set-up message without MSN digit(s), the terminal will interpret it as a normal ca
19、ll. (This may happen if a terminai with MSN capabilities is used on an interface where MSN is not subscribed for.) - In outgoing calls a terminal compatible to the MSN supplementary service can insert its multiple subscriber number in the originating address information of the ca request (see also t
20、he Cailing Line Identification Presentation supplementary service). It is possible to allocate one ISDN number to one or more terminals. Similarly, one terminal may ailow the assignment of one or more than one number. Further, as an administrative option, a specific digit or sequence of digits may b
21、e allocated to enable all terminals in a point-to-multipoint configuration to react in the same way as they would if the supplementary service MSN were not subscribed to. 3.3 Exceptional procedures 3.3.1 Activatioddeactivatiodregistration Not applicable. 3.3.2 Invocation and operation Terminals not
22、compatible with the MSN supplementary service and receiving a call request containing multiple subscriber number digit( shall interpret it as a basic call. 3.4 Alternative procedures 3.4.1 Activatioddeactivatiodregistration None identified. 2 Recommendation 1.251.2 CCITT RECNN*I.25Lm 2*i(REV*L) 92 4
23、862593 0573824 258 3.4.2 Invocation and operation None identified. 4 Network capabilities for charging This Recommendation does not cover charging principles. Futures Recommendations in the D-Series are expected to contain that information. It shall be possible to charge the subscriber accurately fo
24、r the service. 5 Interworking requirements None identified. 6 Interaction with other supplementary services in case of interaction with other supplementary services, these services could be applicable to the individual MSN rather than to the subscriber access. 6.1 6.2 6.3 6.4 6.5 Call Waiting No imp
25、act, i.e. neither supplementary service affects the operation of the other supplementary service. Call Transfer No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Connected Line Identification Presentation No impact, Le. neither supplementary serv
26、ice affects the operation of the other supplementary service. Connected Line Identification Restriction No impact, Le. neither supplementary service affects the operation of the other supplementary service. Calling Line IdentiJcation Presentation If MSN is subscribed to by the calling party, then th
27、is party may provide the appropriate calling party MSN digits or the full ISDN number on outgoing calls. If no mangement 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,
28、 or if no calling number information is provided by the user, then the network should apply the default ISDN number of the calling partys access. At the called partys interface, there is no impact, i.e. neither supplementary service affects the operation of the other supplementary service. 6.6 Calli
29、ng Line Identification Restriction No impact, Le. neither supplementary service affects the operation of the other supplementary service. Recommendation 1.251.2 3 -.CCITT RECMN*I.251- 2*(REV*1) 92 48b2591 O573825 194 I 6.1 Closed User Group Different closed user groups can be assigned to each multip
30、le subscriber number. The network cannot guarantee that a given closed user group matches beyond the access towards the user. As the closed user group assignment to the multiple subscriber numbers is the full responsibility of the user, this may lead to restricted applicability of a combination of t
31、he closed user group and MSN supplementary services. 6.8 Conference Calling No impact, Le. neither supplementary service affects the operation of the other supplementary service. 6.9 Direct-Dialling-In No impact, i.e. neither supplementary service affects the operation of the other supplementary ser
32、vice. Note I - In some networks, subscription to the Direct-Didling-In (DDI) and the multiple subscriber number supplementary service is mutually exclusive. Note 2 - The DDI digits can be used by the private ISDN in the context of the private ISDNs Multiple Subscriber Number supplementary service. 6
33、.10 6.10.1 6.10.2 6.10.3 6.10.4 6.11 6.12 4 Call diversion services Call Forwarding Busy No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Call Forwarding No Reply No impact, i.e. neither supplementary service affects the operation of the other s
34、upplementary service. Call Forwarding Unconditional No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Call Defection No impact, Le. neither supplementary service affects the operation of the other supplementary service. Line Hunting For further s
35、tudy. Three-Party Service No impact, i.e. neither supplementary service affects the operation of the other supplementary service. Recommendation 1.251.2 6.13 6.14 6.15 6.16 6.17 6.18 6.19 CCITT RECMN*I.253. 2*I(REV*3) 92 M 4862593 0573826 O20 W I 6.20 User-to- User Signalling No impact, i.e. neither
36、 supplementary service affects the operation of the other supplementary service. Multiple Subscriber Number Not applicable. 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
37、 affects the operation of the other supplementary service. Multi-Level Precedence and Preemption No impact, Le. neither supplementary service affects the operation of the other supplementary service. Priority No impact, i.e. neither supplementary service affects the operation of the other supplement
38、ary service. Malicious Call Identification If MSN is provided to the served user of Malicious Call Identification (MCID), then MCID shall be provided either globally for the whole access or on a per MSN number basis, according to access arrangements. 6.21 6.22 7 Outgoing Call Barring No impact, i.e.
39、 neither supplementary service afects the operation of the other supplementary service. Reverse Charging No impact, 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 supplementary service. Dynamic description The dynamic description is as for the basic services. Recommendation 1.251.2 5
