SIST ETS 300 661-1:1999

• Abstract:

  B-ISDN UNI layer 3 signalling protocol for supplementary services, B-I SDN CS1

• Status: Published
• Publication Date: 30-Apr-1999
• ICS: 33.080 - Integrated Services Digital Network (ISDN)
• Technical Committee: SPS - Signalling protocols and switching
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-May-1999
• Due Date: 01-May-1999
• Completion Date: 01-May-1999
• Ref Project: ETSI ETS 300 661-1 ed.1 (1997-07) - Broadband Integrated Services Digital Network (B-ISDN); Digital Subscriber Signalling System No. two (DSS2) protocol; Direct Dialling In (DDI) supplementary service; Part 1: Protocol specification [ITU-T Recommendation Q.2951, clause 1 (1995), modified]

SIST ETS 300 661-1:1999 is a SIST standard based on ETSI’s ETS 300 661-1, published for Broadband Integrated Services Digital Network (B-ISDN) signalling. It specifies the stage 3 Digital Subscriber Signalling System No. two (DSS2) protocol for the Direct Dialling In (DDI) supplementary service, so implementers know the signalling and switching behaviour needed at the access interface. It is aimed at public and private B-ISDN equipment that supports DDI.

What does SIST ETS 300 661-1:1999 specify?

SIST ETS 300 661-1:1999 covers the stage 3 protocol for the DDI supplementary service in pan-European B-ISDN. It applies at the TB reference point, or the coincident SB and TB reference point, and it also covers the case where the service is provided to the user via a private B-ISDN.

The standard is organized as clause 1 with subclauses on scope, references, definitions, service rules, number transfer, coding in the Called party number information element, and supplementary service interactions. The foreword also places this part in a six-part series, and Appendix I is informative.

What are the key requirements of SIST ETS 300 661-1:1999?

• Clause 1.1 defines DDI as a stage 3 service description. In practice, this means the document focuses on the protocol and switching functions needed to make the service work, not on the user-facing service description.

• Clause 1.1 limits the scope to B-ISDN access at the TB reference point, including access to a private B-ISDN. This matters because implementers only need to design the signalling for that access case.

• Clause 1.5 says DDI is based on the ISDN number and does not use subaddressing. The DDI number is transferred en-bloc or by overlap receiving from the public network to the private network, which must then establish the call automatically without operator assistance.

• Clause 1.6.1 says the service is provided after prior arrangement and may be withdrawn by the subscriber or for administrative reasons. It also allows partial numbers as a public network option, which may require bilateral agreement on how numbering is interpreted in the private network.

• Clause 1.6.4 requires the private network supporting emulated N-ISDN services to support overlap receiving as well as en-bloc receiving. In practice, this prevents a private network from relying on only one incoming digit-collection method.

• Clause 1.10.1.1 specifies that the DDI number is carried in the number digits field of the Called party number information element. For partial numbers, the numbering plan identification is ISDN numbering plan and the type of number is unknown; for full numbers, the type of number can be national number, international number, or subscriber number.

• Clause 1.12 ties interaction with other supplementary services to ETS 300 669-1. That gives implementers a separate reference for handling service combinations and conflicts.

What terms does SIST ETS 300 661-1:1999 define?

• Broadband Integrated Services Digital Network (B-ISDN) - the broadband part of ISDN.
• Digital Subscriber Signalling System No. two (DSS2) - the signalling system used for the access protocol.
• DDI number - the ISDN number, or part of it, that is delivered to the private B-ISDN and is significant there.
• Partial number - the latter part of an ISDN number that still qualifies as a DDI number.
• Public network - the DSS2 protocol entity on the network side of the TB reference point.
• Private network - the DSS2 protocol entity on the user side of the TB reference point.
• En-bloc receiving - number delivery in a single message.
• Overlap receiving - number delivery digit by digit or in several messages as digits become available.

Who uses SIST ETS 300 661-1:1999?

B-ISDN network engineers, switch vendors, terminal equipment suppliers, and interoperability test teams use this standard. They use it to implement DDI call setup, code and decode the called number, and verify behaviour between public and private networks.

What changed in SIST ETS 300 661-1:1999 from the previous edition?

SIST ETS 300 661-1:1999 is an ETSI-approved modification of ITU-T Recommendation Q.2951, clause 1 (1995). The modifications shown in the text include:

• a rewritten scope for stage 3 DDI in B-ISDN,
• updated normative references,
• revised and added definitions,
• new rules on number use, service provision, and partial numbers,
• clearer requirements for en-bloc and overlap receiving,
• specific Called party number coding rules,
• and replacement of the interaction clause by a reference to ETS 300 669-1.

Which standards are used with SIST ETS 300 661-1:1999?

Reference	What it contributes
ETS 300 443-1	Basic call and bearer control procedures, including Called party number handling
ETS 300 669-1	Supplementary service interactions
ITU-T Recommendation I.112	General ISDN vocabulary
ITU-T Recommendation I.210	Principles of telecommunication services and supplementary services
ETS 300 661-2 to ETS 300 661-6	PICS, TSS&TP, ATS, and partial PIXIT material for user and network conformance work

What does the SIST ETS 300 661-1:1999 document contain?

SIST ETS 300 661-1:1999 contains protocol rules for the DDI supplementary service, including number delivery, call setup behaviour, and coding of the Called party number information element. It also includes the service interaction reference to ETS 300 669-1 and marks Appendix I as informative. The foreword points readers to the later parts of the series for conformance and test specifications.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Broadband Integrated Services Digital Network (B-ISDN); Digital Subscriber Signalling System No. two (DSS2) protocol; Direct Dialling In (DDI) supplementary service; Part 1: Protocol specification [ITU-T Recommendation Q.2951, clause 1 (1995), modified]33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:ETS 300 661-1 E13SIST ETS 300 661-1:199en01-DSULO-1993SIST ETS 300 661-1:199SLOVENSKI
STANDARD
FINAL DRAFTEUROPEANprETS 300 661-1TELECOMMUNICATIONFebruary 1997STANDARDSource: ETSI TC-SPSReference: DE/SPS-05071-1ICS:33.020Key words:B-ISDN, DSS2, supplementary service, DDIBroadband Integrated Services Digital Network (B-ISDN);Digital Subscriber Signalling System No. two (DSS2) protocol;Direct Dialling In (DDI) supplementary service;Part 1: Protocol specification[ITU-T Recommendation Q.2951, clause 1 (1995), modified]ETSIEuropean Telecommunications Standards InstituteETSI SecretariatPostal address: F-06921 Sophia Antipolis CEDEX - FRANCEOffice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCEX.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail].: [phone] - Fax: [phone]Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and theforegoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1997. All rights reserved.SIST ETS 300 661-1:1999

Page 2Final draft prETS 300 661-1: February 1997ForewordThis final draft European Telecommunication Standard (ETS) has been produced by the SignallingProtocols and Switching (SPS) Technical Committee of the European Telecommunications StandardsInstitute (ETSI), and is now submitted for the Voting phase of the ETSI standards approval procedure.This ETS is part 1 of a multi-part standard covering the Digital Subscriber Signalling System No. two(DSS2) protocol specification for the Broadband Integrated Services Digital Network (B-ISDN) DirectDialling In (DDI) supplementary service, as described below:Part 1:"Protocol specification";Part 2:"Protocol Implementation Conformance Statement (PICS) proforma specification";Part 3:"Test Suite Structure and Test Purposes (TSS&TP) specification for the user";Part 4:"Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing(PIXIT) proforma specification for the user";Part 5:"TSS&TP specification for the network";Part 6:"ATS and partial PIXIT proforma specification for the network".In accordance with CCITT Recommendation I.130, the following three level structure is used to describethe supplementary telecommunication services as provided by European public telecommunicationsoperators under the pan-European B-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 servicedescribed in stage 1; and-Stage 3: defines the signalling system protocols and switching functions needed to implement theservice described in stage 1.This ETS details the stage 3 aspects (signalling system protocols and switching functions) needed tosupport the DDI supplementary service. The stage 1 and stage 2 aspects of the equivalent N-ISDNsupplementary services are detailed in ETS 300 062 and ETS 300 063, respectively, and have beenassumed as appropriate to be the foundation for the equivalent B-ISDN supplementary servicespecifications.Proposed transposition datesDate of latest announcement of this ETS (doa):3 months after ETSI publicationDate of latest publication of new National Standardor endorsement of this ETS (dop/e):6 months after doaDate of withdrawal of any conflicting National Standard (dow):6 months after doaEndorsement noticeThe text of ITU-T Recommendation Q.2951, clause 1 (1995) was approved
by ETSI as an ETS withagreed modifications as given below.NOTE:New or modified text is indicated using sidebars. In addition, underlining and/or strike-out are used to highlight detailed modifications where necessary.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.SIST ETS 300 661-1:1999

Page 3Final draft prETS 300 661-1: February 1997subclause 1.1Replace subclause 1.1 by:1.1ScopeThis first part of ETS 300 661 specifies the stage three of the Direct Dialling In (DDI) supplementaryservice for the pan-European Broadband Integrated Services Digital Network (B-ISDN) as provided byEuropean public telecommunications operators at the TB reference point or coincident SB and TBreference point (as defined in ITU-T Recommendation I.413 [1]) by means of the Digital SubscriberSignalling System No. two (DSS2) protocol. Stage three identifies the protocol and procedures andswitching functions needed to support a telecommunication service (see ITU-T RecommendationI.130 [2]).In addition, this ETS specifies the protocol requirements at the TB reference point where the service isprovided to the user via a private B-ISDN.This ETS does not specify the additional protocol requirements where the service is provided to the uservia a telecommunications network that is not a B-ISDN.The DDI supplementary service enables a user to call directly via a public B-ISDN a user on a privateB-ISDN by using the public ISDN numbering plan.The DDI supplementary service is applicable to all telecommunication services.Further parts of this ETS specify the method of testing required to identify conformance to this ETS.This ETS is applicable to equipment, supporting the DDI supplementary service, to be attached at eitherside of a TB reference point or coincident SB and TB reference point when used as an access to the publicB-ISDN.subclause 1.2, first paragraphReplace the first paragraph of subclause 1.2 by:This ETS incorporates by dated and undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publicationsapply to this ETS only when incorporated in it by amendment or revision. For undated references the latestedition of the publication referred to applies.subclause 1.2Insert the following references at the end of subclause 1.2:[7]ETS 300 443-1: "Broadband Integrated Services Digital Network (B-ISDN);Digital Subscriber
...

SLOVENSKI STANDARD
01-maj-1999
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Broadband Integrated Services Digital Network (B-ISDN); Digital Subscriber Signalling
System No. two (DSS2) protocol; Direct Dialling In (DDI) supplementary service; Part 1:
Protocol specification [ITU-T Recommendation Q.2951, clause 1 (1995), modified]
Ta slovenski standard je istoveten z: ETS 300 661-1 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 300 661-1
TELECOMMUNICATION July 1998
STANDARD
Source: SPS Reference: DE/SPS-05071-1
ICS: 33.020
Key words: B-ISDN, DSS2, supplementary service, DDI
Broadband Integrated Services Digital Network (B-ISDN);
Digital Subscriber Signalling System No. two (DSS2) protocol;
Direct Dialling In (DDI) supplementary service;
Part 1: Protocol specification
[ITU-T Recommendation Q.2951, clause 1 (1995), modified]
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Internet: [e-mail] - http://www.etsi.fr - http://www.etsi.org
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 1998. All rights reserved.

Page 3
ETS 300 661-1: July 1998
Foreword
This European Telecommunication Standard (ETS) has been produced by the Signalling Protocols and
Switching (SPS) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS is part 1 of a multi-part standard covering the Digital Subscriber Signalling System No. two
(DSS2) protocol specification for the Broadband Integrated Services Digital Network (B-ISDN) Direct
Dialling In (DDI) supplementary service, as described below:
Part 1: "Protocol specification";
Part 2: "Protocol Implementation Conformance Statement (PICS) proforma specification";
Part 3: "Test Suite Structure and Test Purposes (TSS&TP) specification for the user";
Part 4: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing
(PIXIT) proforma specification for the user";
Part 5: "TSS&TP specification for the network";
Part 6: "ATS and partial PIXIT proforma specification for the network".
In accordance with CCITT Recommendation I.130, the following three level structure is used to describe
the supplementary telecommunication services as provided by European public telecommunications
operators under the pan-European B-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 3 aspects (signalling system protocols and switching functions) needed to
support the DDI supplementary service. The stage 1 and stage 2 aspects of the equivalent N-ISDN
supplementary services are detailed in ETS 300 062 and ETS 300 063, respectively, and have been
assumed as appropriate to be the foundation for the equivalent B-ISDN supplementary service
specifications.
Transposition dates
Date of adoption of this ETS: 2 May 1997
Date of latest announcement of this ETS (doa): 31 October 1998
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 April 1999
Date of withdrawal of any conflicting National Standard (dow): 30 April 1999
Endorsement notice
The text of ITU-T Recommendation Q.2951, clause 1 (1995) was approved by ETSI as an ETS with
agreed modifications as given below.
NOTE: New or modified text is indicated using sidebars. In addition, underlining and/or strike-
out are used to highlight detailed modifications where necessary.
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 Standards Making Support Dept." at the address shown on the title page.

Page 4
ETS 300 661-1: July 1998
subclause 1.1
Replace subclause 1.1 by:
1.1      Scope
This first part of ETS 300 661 specifies the stage three of the Direct Dialling In (DDI) supplementary
service for the pan-European Broadband Integrated Services Digital Network (B-ISDN) as provided by
European public telecommunications operators at the T reference point or coincident S and T
B B B
reference point (as defined in ITU-T Recommendation I.413 [1]) by means of the Digital Subscriber
Signalling System No. two (DSS2) protocol. Stage three identifies the protocol and procedures and
switching functions needed to support a telecommunication service (see ITU-T Recommendation
I.130 [2]).
In addition, this ETS specifies the protocol requirements at the T reference point where the service is
B
provided to the user via a private B-ISDN.
This ETS does not specify the additional protocol requirements where the service is provided to the user
via a telecommunications network that is not a B-ISDN.
The DDI supplementary service enables a user to call directly via a public B-ISDN a user on a private
B-ISDN by using the public ISDN numbering plan.
The DDI supplementary service is applicable to all telecommunication services.
Further parts of this ETS specify the method of testing required to identify conformance to this ETS.
This ETS is applicable to equipment, supporting the DDI supplementary service, to be attached at either
side of a T reference point or coincident S and T reference point when used as an access to the public
B B B
B-ISDN.
subclause 1.2, first paragraph
Replace the first paragraph of subclause 1.2 by:
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest
edition of the publication referred to applies.
subclause 1.2
Insert the following references at the end of subclause 1.2:
[7]                   ETS 300 443-1: "Broadband Integrated Services Digital Network (B-ISDN);
Digital Su
...