SIST ES 201 481 V1.1.1:2005

• Abstract:

  To identify and investigate if there are additional requirements to ISDN services, as a result of user requirements on DDI ranges.

• Status: Published
• Publication Date: 31-Dec-2004
• ICS: 33.080 - Integrated Services Digital Network (ISDN)
• Technical Committee: SPN - Services and Protocols for Networks
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-2005
• Due Date: 01-Jan-2005
• Completion Date: 01-Jan-2005
• Ref Project: ETSI ES 201 481 V1.1.1 (1999-12) - Integrated Services Digital Network (ISDN); ISDN service enhancements based on DDI ranges for call diversion supplementary services

SIST ES 201 481 V1.1.1:2005 is a Slovenian standard published by SIST that reproduces ETSI ES 201 481 V1.1.1. It covers Integrated Services Digital Network (ISDN) service enhancements based on Direct Dialling In (DDI) ranges, focusing on call diversion supplementary services for private and public network interworking.

What does SIST ES 201 481 V1.1.1:2005 specify?

SIST ES 201 481 V1.1.1:2005 specifies how DDI ranges can be used to control call diversion supplementary services for part of a hunt group instead of for the whole access. It applies to circuit-switched telecommunication services and is structured into scope, references, definitions and abbreviations, user requirements, description, and intercommunication considerations.

Clause 4 states the user need: activation, deactivation, and interrogation should be possible on a DDI range basis. Clause 5 describes how DDI ranges are provisioned and identified. Clause 6 explains how DDI ranges interact with the call diversion supplementary services.

What are the key requirements of SIST ES 201 481 V1.1.1:2005?

SIST ES 201 481 V1.1.1:2005 gives the rules for defining, provisioning, and using DDI ranges so that supplementary services can be managed per range. In practice, this lets a network treat different number blocks in the same access differently, which is useful for private networks with several nodes or for failover routing.

DDI ranges are an alternative to whole-access control

Clause 1 and clause 4 define the main idea: supplementary services can be assigned to a DDI range instead of to all numbers on the access. For operators and users, that means service control can follow the numbering structure of a private network.

Provisioning is a service provider option

Clause 5 states that DDI ranges are provided or withdrawn only by prior arrangement with the service provider. The same clause says that using DDI ranges requires the DDI supplementary service on a hunt group. This matters because the feature is not automatic - it has to be ordered and configured.

Each range is identified by its first DDI number

Clause 5 uses the first DDI number of a range as the DDI range identifier. That identifier is used for activation, deactivation, and interrogation procedures. In practice, administrators need a stable numbering plan because the identifier is the handle used to manage the range.

Ranges must be clearly separated

Clause 5 says a DDI range is a coherent block of sequential DDI numbers, although non-sequential sets can be offered as a service provider option. It also says overlapping ranges are not allowed, different-sized ranges with the same identifier are not allowed, and multiple allocation of identifiers per hunt group number shall not apply. This avoids ambiguity when a call or service request is mapped to a range.

Gaps are allowed and the whole hunt group need not be covered

Clause 5 allows gaps between ranges, so a hunt group can have separated number blocks under different treatment. It also gives a network provider option for the maximum number of DDI ranges per hunt group, from 1 to 15, with the operator choosing the actual maximum. That gives flexibility, but it also means provisioning rules must be kept consistent.

The service interactions are defined for CFU, CFB, CFNR, CD, and SCF

Clause 6.1 says the DDI range logic applies to the call diversion supplementary services. For Call Forwarding Unconditional (CFU), Call Forwarding Busy (CFB), Call Forwarding No Reply (CFNR), and Selective Call Forwarding (SCF), a range-based activation replaces any previous whole-access activation. For Call Deflection (CD), the service can be provided either on a DDI range basis or on the whole access. In practice, this defines how a serving user can switch from broad forwarding to targeted forwarding by number block.

The document is a basis for revising interaction rules

Clause 1 says the document is intended as a basis for revising the interaction sections of the DDI supplementary service and the call diversion supplementary services. That means it is not just descriptive - it sets the service model that later interaction rules should follow.

What terms does SIST ES 201 481 V1.1.1:2005 define?

• DDI range - a summarized group of sequential DDI numbers, used as a subscription option to control supplementary services for part of an access.
• DDI range identifier - the first DDI number of a range, used to identify the range for activation, deactivation, and interrogation.
• DDI - Direct Dialling In, the numbering method used to address individual numbers within a hunt group.
• supplementary service - an additional network service, such as call forwarding or call deflection, that works with the base ISDN service.
• ISDN number - a number that follows the E.164 numbering plan and structure.
• access - the general term used for basic access and primary rate access.

Who uses SIST ES 201 481 V1.1.1:2005?

SIST ES 201 481 V1.1.1:2005 is used by ISDN service providers, network operators, and private network providers that manage hunt groups and call diversion behavior. It is also relevant to engineers and planners who configure DDI numbering, service profiles, and interworking between private ISDN and public ISDN at the T reference point.

In practice, it helps when designing number ranges, assigning forwarding rules to specific blocks, or defining how a customer site should reroute calls if part of a private network fails.

Which standards are used with SIST ES 201 481 V1.1.1:2005?

Clause 2 cites these references, which provide the numbering, terminology, and related service descriptions used by this standard:

• ITU-T Recommendation I.112 - ISDN vocabulary and the definitions of basic access and primary rate access.
• ITU-T Recommendation I.210 - general principles for telecommunication services supported by ISDN.
• ITU-T Recommendation E.164 - the international public telecommunication numbering plan used for ISDN numbers.
• ETSI ETS 300 062 - the DDI supplementary service description.
• ETSI ETS 300 199 - the Call Forwarding Busy (CFB) supplementary service description.
• ETSI EN 301 133 - the Selective Call Forwarding (SCF) supplementary service descriptions for unconditional, busy, and no reply cases.

The intercommunication clause also points back to the DDI and call diversion service descriptions, so these references are part of how the document is meant to be read.

What does the SIST ES 201 481 V1.1.1:2005 document contain?

The document contains a short service model rather than a test method or compliance procedure. Clause 5 includes a figure that illustrates access configuration with DDI ranges, showing how different range identifiers relate to service profiles and whole-access control.

Clause 6 breaks the behavior down by supplementary service - CFU, CFB, CFNR, CD, and SCF - so implementers can see how range-based activation changes earlier whole-access activation. The bibliography lists related ISDN service descriptions for trunk hunting, call forwarding, call deflection, and public/private ISDN interworking, which helps readers place this standard in the wider ISDN service set.

SLOVENSKI STANDARD
01-januar-2005
Digitalno omrežje z integriranimi storitvami (ISDN) – Izboljšanje storitve ISDN na
podlagi dosegov DDI za dopolnilne storitve izsmeritve klica
Integrated Services Digital Network (ISDN); ISDN service enhancements based on DDI
ranges for call diversion supplementary services
Ta slovenski standard je istoveten z: ES 201 481 Version 1.1.1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

ETSI ES 201 481 V1.1.1 (2000-03)
ETSI Standard
Integrated Services Digital Network (ISDN);
ISDN service enhancements based on DDI ranges
for the call diversion supplementary services

2 ETSI ES 201 481 V1.1.1 (2000-03)
Reference
DES/SPAN-020075
Keywords
DDI, ISDN, supplementary service
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ETSI
3 ETSI ES 201 481 V1.1.1 (2000-03)
Contents
Intellectual Property Rights.4
Foreword .4
Introduction .4
1 Scope.5
2 References.5
3 Definitions and abbreviations .6
3.1 Definitions.6
3.2 Abbreviations .6
4 User requirements .6
5 Description .6
6 Intercommunication considerations .8
6.1 Effect of DDI ranges on the DDI supplementary service and the interactions with the call diversion
supplementary services.8
6.1.1 Call Forwarding Unconditional (CFU) .8
6.1.2 Call Forwarding Busy (CFB).8
6.1.3 Call Forwarding No Reply (CFNR).8
6.1.4 Call Deflection (CD).8
6.1.5 Selective Call Forwarding (SCF).8
Bibliography.9
History.10
ETSI
4 ETSI ES 201 481 V1.1.1 (2000-03)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect
of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server
(http://www.etsi.org/ipr).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in SR 000 314 (or the updates on the ETSI Web server)
which are, or may be, or may become, essential to the present document.
Foreword
This ETSI Standard (ES) has been produced by ETSI Technical Committee Services and Protocols for Advanced
Networks (SPAN).
Introduction
The present document describes the structure and the functions of DDI ranges and the effects on the DDI supplementary
service and the call diversion supplementary services.
ETSI
5 ETSI ES 201 481 V1.1.1 (2000-03)
1 Scope
The present document defines the possibility to assign call diversion supplementary services to a DDI range as an
alternative to assigning supplementary services to the whole hunt group.
The purpose of the introduction of DDI ranges is to fulfil the user requirements concerning the DDI supplementary
service and the interactions with the call diversion supplementary services.
The present document shall be considered as a base for the revision of the interaction sections of the DDI supplementary
service and the call diversion supplementary services.
The ISDN Service enhancements based on DDI ranges for the call diversion supplementary services are applicable to all
circuit-switched telecommunication services.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies.
• A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same
number.
[1] ITU-T Recommendation I.112 (1993): "Vocabulary of terms for
...