SIST ETS 300 062 E1:2003

• Abstract:

  T/NA1(89)19

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.080 - Integrated Services Digital Network (ISDN)
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI ETS 300 062 ed.1 (1991-10) - Integrated Services Digital Network (ISDN); Direct Dialling In (DDI) supplementary service; Service Description

Overview

SIST ETS 300 062 E1:2003 defines the service description for the Direct Dialling In (DDI) supplementary service within the Integrated Services Digital Network (ISDN). Developed by the Slovenian Institute for Standardization (SIST), this standard aligns with the European Telecommunications Standards Institute (ETSI) ETS 300 062, providing a comprehensive framework for the implementation and interworking of DDI across public and private ISDNs. DDI allows users on public ISDNs to reach users on private ISDNs directly through a public ISDN numbering plan, facilitating seamless connectivity in enterprise environments.

Key Topics

• Direct Dialling In (DDI) Service: DDI enables the direct routing of calls from a public ISDN to subscribers within a private ISDN, using specific ISDN numbers issued by the service provider.
• Scope of Applicability: The standard details usage in both basic access and primary rate access modes of ISDN, ensuring that organizations with different infrastructure levels can utilize DDI.
• Interworking Requirements: Emphasizes interoperability between private and public ISDNs. The standard describes base functionality for scenarios where users are served via private ISDN systems but receive calls from the public network.
• Numbering: DDI utilizes the ISDN numbering plan as specified by CCITT Recommendation E.164, ensuring compatibility and uniformity in international and national telecommunications.
• Service Provision and Withdrawal: DDI service is enabled or removed by prior arrangement with the provider, which is responsible for assigning the relevant ISDN numbers.
• Interaction with Other Supplementary Services: The DDI service is designed to operate alongside other supplementary ISDN services such as call waiting, call hold, call transfer, number identification, and user-user signalling, ensuring broad compatibility.

Applications

The DDI supplementary service is particularly valuable for businesses and organizations that maintain private ISDNs, such as:

• Corporate Telephony Systems: Enables direct public network access for employees without the need for an operator or switchboard intervention.
• Flexible Numbering for Large Organizations: Provides each user or department behind a corporate ISDN with a unique public-facing number while simplifying call management.
• Integration of Public and Private Networks: Enhances the efficiency of communication between external callers and private ISDN subscribers, important for customer service centers and enterprises with distributed office locations.
• Scalable Communication Infrastructure: Supports business growth by allowing the easy expansion of internal telephone systems without major changes to external connectivity or numbering.

DDI’s implementation allows businesses to streamline public-to-private call routing, improving both accessibility and customer experience.

Related Standards

For comprehensive ISDN DDI implementation, the following closely related standards are typically referenced:

• ETS 300 062 (Edition 1): European reference for service description.
• ETS 300 063: Defines the functional capabilities and information flows required to support DDI (Stage 2).
• ETS 300 064: Details the signalling protocols and switching functions necessary for DDI service implementation (Stage 3).
• CCITT Recommendation I.130: Outlines the methodology for the characterization of telecommunication services supported by ISDN.
• CCITT Recommendation E.164: Provides the universal numbering plan for ISDN, ensuring interoperability across networks.
• CCITT Recommendations I.112, I.210, Q.9: Glossaries and principles for ISDN terminology and service description.

Conclusion

SIST ETS 300 062 E1:2003 is an essential standard for organizations leveraging ISDN technology, detailing the Direct Dialling In (DDI) supplementary service that underpins efficient, direct communication between public networks and private ISDN infrastructures. Adhering to this standard ensures robust compatibility, scalability, and seamless integration of supplementary services within modern telecom environments.

Keywords: ISDN, Direct Dialling In, DDI, supplementary service, public ISDN, private ISDN, telecommunications, numbering plan, standards, interoperability, corporate telephony.

SLOVENSKI STANDARD
01-december-2003
Digitalno omrežje z integriranimi storitvami (ISDN) – Dopolnilna storitev:
neposredno izbiranje (DDI) – Opis storitve
Integrated Services Digital Network (ISDN); Direct Dialling In (DDI) supplementary
service; Service Description
Ta slovenski standard je istoveten z: ETS 300 062 Edition 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.

EUROPEAN ETS 300 062
TELECOMMUNICATION October 1991
STANDARD
Source: ETSI TC-NA Reference: T/NA1(89)19
ICS: 33.080
ISDN, supplementary service
Key words:
Integrated Services Digital Network (ISDN);
Direct Dialling In (DDI) supplementary service
Service Description
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - [e-mail]
X.400: Internet:
Tel.: [phone] - Fax: [phone]
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1991. All rights reserved.
New presentation - see History box

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ETS 300 062: October 1991
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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ETS 300 062: October 1991
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions.8
4 Symbols and abbreviations .8
5 Description .8
6 Procedures.8
6.1 Provision and withdrawal .8
6.2 Normal procedures .8
6.2.1 Activation, deactivation and registration.8
6.2.2 Erasure.9
6.2.3 Invocation and operation .9
6.2.4 Interrogation .9
6.3 Exceptional procedures .9
6.3.1 Activation, deactivation and registration.9
6.3.2 Erasure.9
6.3.3 Invocation and operation .9
6.3.4 Interrogation .9
7 Intercommunication considerations.9
7.1 Interworking with non-ISDNs .9
7.2 Interworking with private ISDNs.9
8 Interaction with other supplementary services .10
8.1 Advice of charge services.10
8.1.1 Charging information at call set-up time.10
8.1.2 Charging information during the call.10
8.1.3 Charging information at the end of the call.10
8.2 Call waiting.10
8.3 Call hold .10
8.4 Call transfer services .10
8.4.1 Explicit call transfer .10
8.4.2 Single step call transfer.10
8.5 Number identification services.10
8.5.1 Calling line identification presentation .10
8.5.2 Calling line identification restriction .11
8.5.3 Connected line identification presentation.11
8.5.4 Connected line identification restriction.11
8.6 Closed user group.11
8.7 Completion of calls to busy subscriber .11
8.8 Conference services .11
8.8.1 Conference call, add-on .11
8.8.2 Meet me conference .11
8.9 Direct dialling in.11
8.10 Diversion services.11
8.10.1 Call forwarding unconditional .11
8.10.2 Call forwarding busy.11
8.10.3 Call forwarding no reply.12
8.10.4 Call deflection.12
8.11 Freephone.12

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ETS 300 062: October 1991
8.12 Malicious call identification. 12
8.13 Multiple subscriber number . 12
8.14 Subaddressing . 12
8.15 Terminal portability. 12
8.16 Three party. 12
8.17 User-user signalling. 12
History. 13

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ETS 300 062: October 1991
Foreword
This European Telecommunication Standard (ETS) has been produced by the Network Aspects (NA)
Technical Committee of the European Telecommunications Standards Institute (ETSI).
In accordance with CCITT Recommendation I.130 [1], the following three level structure is used to
describe the supplementary telecommunications services as provided by European public
telecommunications operators under the pan-European Integrated Services Digital Network (ISDN):
- Stage 1: is an overall service description, from the user's standpoint;
- Stage 2: identifies the functional capabilities and information flows needed to support the service
described in stage 1; and
- Stage 3: defines the signalling system protocols and switching functions needed to implement the
service described in stage 1.
This ETS details the stage 1 aspects (overall service description) for the Direct Dialling In (DDI)
supplementary service. The stage 2 and stage 3 aspects are detailed in ETS 300 063 (1991) and ETS
300 064 (1991), respectively.
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ETS 300 062: October 1991
Blank page
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ETS 300 062: October 1991
1 Scope
This standard defines the stage one of the Direct Dialling In (DDI) supplementary service for the pan-
European Integrated Services Digital Network (ISDN) as provided by European public telecommunications
operators. Stage one is an overall service description from the user's point of view (see CCITT
Recommendation I.130 [1]), but does not deal with the details of the human interface itself.
This standard defines the interworking requirements of private ISDNs with the public ISDN.
In addition this standard specifies the base functionality where the service is provided to the user via a
private ISDN.
This standard does not specify the additional requirements where the service is provided to the user via a
telecommunications network that is not an ISDN but does include interworking requirements of other
networks with the public ISDN.
Interactions with supplementary services not listed in Clause 8 are outside the scope of this standard.
Charging principles are outside the scope of this standard.
The DDI supplementary service enables a user to call directly via a public ISDN a user on a private ISDN
by using the public ISDN numbering plan.
The DDI supplementary service is applicable to all telecommunication services.
This standard is applicable to the stage two and stage three standards for th
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