ITU-T Rec. I.251.2 (08/92) Multiple Subscriber Number

ITU-T Rec. I.251.2 (08/92) Multiple Subscriber Number
INTERNATIONAL TELECOMMUNICATION UNION
CCITT
I.251.2 (rev.1)
THE INTERNATIONAL
TELEGRAPH AND TELEPHONE
CONSULTATIVE COMMITTEE
INTEGRATED SERVICES DIGITAL
NETWORK (ISDN)
GENERAL STRUCTURE AND SERVICE
CAPABILITIES
MULTIPLE SUBSCRIBER NUMBER
Recommendation I.251.2 (rev.1)
Geneva, 1992
FOREWORD
The CCITT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the
International Telecommunication Union (ITU). CCITT is responsible for studying technical, operating and tariff
questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide
basis.
The Plenary Assembly of CCITT which meets every four years, establishes the topics for study and approves
Recommendations prepared by its Study Groups. The approval of Recommendations by the members of CCITT between
Plenary Assemblies is covered by the procedure laid down in CCITT Resolution No. 2 (Melbourne, 1988).
Recommendation I.251.2 was prepared by Study Group I and was approved under the Resolution No. 2
procedure on the 4th of August 1992.
___________________
CCITT NOTE
In this Recommendation, the expression “Administration” is used for conciseness to indicate both a
telecommunication Administration and a recognized private operating agency.
 ITU 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 photocopying and microfilm, without permission in writing from the ITU.
Recommendation I.251.2
Recommendation I.251.2
MULTIPLE SUBSCRIBER NUMBER
(revised 1992)
1
Definition
Multiple Subscriber Number provides the possibility for assigning multiple integrated services 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);
2)
enables the network to determine which ISDN number is applicable on originating calls (e.g. for charging
purposes, for notification to the called party and application for supplementary services).
It is considered:
–
that some Administrations may not have knowledge or control over what is connected to the basic access,
e.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 assigning 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 user’s installation. They 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 1 – Within a private ISDN, multiple subscriber number 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 terminal is a matter of national
implementation.
2.2
Specific terminology
None.
2.3
Qualifications on the applicability to telecommunication services
No restriction to either circuit or packet mode.
Recommendation I.251.2
1
3
Procedures
3.1
Provision/withdrawal
The service shall be provided after pre-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 provider, the user may specify a mapping arrangement between ISDN number and
MSN digit(s).
3.2
Normal procedures
3.2.1
Activation/deactivation/registration
Activation through subscription.
3.2.2
Invocation and operation
The destination number sent by the calling user will be analyzed in the network. If the called user subscribes to
this supplementary service, the network sends the available part of the ISDN number or at least the relating digit(s):
i)
identical 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).
Terminals compatible to the MSN service will react on a call as follows:
–
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 call. (This may
happen if a terminal 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 call request (see also the Calling Line Identification Presentation
supplementary service).
It is possible to allocate one ISDN number to one or more terminals. Similarly, one terminal may allow the
assignment of one or more than one number. Further, as an administrative option, a specific digit or sequence of digits
may be 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
Activation/deactivation/registration
Not applicable.
3.3.2
Invocation and operation
Terminals not compatible with the MSN supplementary service and receiving a call request containing
multiple subscriber number digit(s) shall interpret it as a basic call.
3.4
Alternative procedures
3.4.1
Activation/deactivation/registration
None identified.
2
Recommendation I.251.2
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 for 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
Call Waiting
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.2
Call Transfer
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.3
Connected Line Identification Presentation
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.4
Connected Line Identification Restriction
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.5
Calling Line Identification Presentation
If MSN is subscribed to by the calling party, then this party 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 information is provided by the user, then the network should apply the default ISDN
number of the calling party’s access.
At the called party’s interface, there is no impact, i.e. neither supplementary service affects the operation of the
other supplementary service.
6.6
Calling Line Identification Restriction
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
Recommendation I.251.2
3
6.7
Closed User Group
Different closed user groups can be assigned to each multiple 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 the closed user group and MSN supplementary services.
6.8
Conference Calling
No impact, i.e. 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 service.
Note 1 – In some networks, subscription to the Direct-Dialling-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.
6.10
Call diversion services
6.10.1
Call Forwarding Busy
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.10.2
Call Forwarding No Reply
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.10.3
Call Forwarding Unconditional
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.10.4
Call Deflection
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.11
Line Hunting
For further study.
6.12
Three-Party Service
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
4
Recommendation I.251.2
6.13
User-to-User Signalling
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.14
Multiple Subscriber Number
Not applicable.
6.15
Call Hold
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.16
Advice of Charge
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.17
Multi-Level Precedence and Preemption
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.18
Priority
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.19
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.
6.20
Outgoing Call Barring
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.21
Reverse Charging
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
6.22
Sub-addressing
No impact, i.e. neither supplementary service affects the operation of the other supplementary service.
7
Dynamic description
The dynamic description is as for the basic services.
Recommendation I.251.2
5
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