SIST ETS 300 770-1:1998

• Abstract:

  B-ISDN UNI layer 3 signalling protocol for supplementary services, B-ISDN CS2

• Status: Published
• Publication Date: 31-Aug-1998
• 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-Sep-1998
• Due Date: 01-Sep-1998
• Completion Date: 01-Sep-1998
• Ref Project: ETSI ETS 300 770-1 ed.1 (1998-05) - Broadband Integrated Services Digital Network (B-ISDN); Digital Subscriber Signalling System No. two (DSS2) protocol; Closed User Group (CUG) supplementary service; Part 1: Protocol specification [ITU-T Recommendation Q.2955.1 (1996), modified]

SIST ETS 300 770-1:1998 is the Slovenian adoption of ETSI ETS 300 770-1 for the Broadband Integrated Services Digital Network (B-ISDN) Closed User Group (CUG) supplementary service. It specifies the stage 3 Digital Subscriber Signalling System No. two (DSS2) protocol for CUG on the B-ISDN user-network interface, so it is the document to use when implementing or checking signalling behaviour for CUG-capable equipment.

What does SIST ETS 300 770-1:1998 specify?

SIST ETS 300 770-1:1998 specifies the stage 3 protocol aspects of the CUG supplementary service for the pan-European B-ISDN. In practice, that means the protocol, procedures and switching functions needed to support CUG operation at the TB reference point, or at coincident SB and TB reference point, using DSS2.

The scope is centered on B-ISDN access and on equipment that supports CUG at either side of the TB reference point when used as access to the public B-ISDN. The text also covers protocol requirements at the TB reference point when the service is provided through a private B-ISDN.

The foreword presents the standard as part 1 of a six-part series:

Part	Topic
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

What are the key requirements of SIST ETS 300 770-1:1998?

Clause 1.1 makes the service model clear: CUG lets users belong to one or more groups with restricted access. Members can normally communicate inside the group, while extra permissions or restrictions can be applied for calls to or from outside the group. For implementers, this is the core rule set that the signalling must enforce.

Stage 3 behaviour and access points

SIST ETS 300 770-1:1998 defines the stage 3 part of the service, so it is concerned with signalling behaviour rather than the user-facing service description. That matters because protocol implementers need to match the call control behaviour at the network interface, not just the service intention.

Two CUG call types

Clause 1.1 distinguishes two CUG call types. Type 1 covers calls that emulate N-ISDN services and are identified by the presence of the N-BC information element; for these calls, CUG control depends on the calling and called ISDN numbers and on the basic telecommunication service involved. Type 2 covers B-ISDN applications with no basic service dependence; these are identified by the absence of the N-BC information element and by the absence of a coded B-ISDN service type in SETUP, and control depends only on the ISDN numbers.

For users and buyers, this distinction matters because it tells them whether the implementation has to consider the underlying basic service when enforcing CUG rules.

Connection-control basis

The protocol text ties point-to-point CUG support to Q.2931 as modified by ETS 300 443-1, and it ties point-to-multipoint CUG support to Q.2971 as modified by ETS 300 771-1 through the related annex text. In practice, implementers need to know which call-control procedures the CUG rules sit on top of.

Conformance testing

The foreword says that further parts of the series specify methods of testing for conformance. For engineering teams, that means this part defines the protocol, while the later parts provide the PICS, TSS&TP, ATS and PIXIT material needed for verification.

What terms does SIST ETS 300 770-1:1998 define?

• Closed User Group (CUG) - A service that restricts access so that users belong to defined groups and communication is controlled between members and non-members.
• Broadband Integrated Services Digital Network (B-ISDN) - The broadband ISDN environment for which this DSS2 supplementary service is specified.
• Digital Subscriber Signalling System No. two (DSS2) - The signalling system used at the B-ISDN user-network interface for this protocol.
• TB reference point - The interface reference point at which the CUG protocol requirements are specified.
• N-BC information element - The element used to identify emulated N-ISDN services in Type 1 CUG calls.
• Protocol Implementation Conformance Statement (PICS) - The proforma used in the companion parts to record how an implementation claims conformance.

Who uses SIST ETS 300 770-1:1998?

This standard is used by public telecommunications operators, B-ISDN equipment designers, signalling implementers, and conformance test teams. It is also relevant to buyers or quality managers who need to check whether equipment supports CUG at the TB reference point or at coincident SB and TB reference point. The document is particularly relevant when a product must support CUG on public B-ISDN access or on a private B-ISDN access path.

What changed in SIST ETS 300 770-1:1998 from the previous edition?

SIST ETS 300 770-1:1998 is based on ITU-T Recommendation Q.2955.1 (1996), with ETSI-agreed modifications. The text replaces subclause 1.1 with a scope written for B-ISDN access at the TB reference point, adds the Type 1 and Type 2 CUG call distinction, updates the reference list in subclause 1.2, deletes the earlier Q.2932 reference, and replaces several references throughout the text, including those for Q.85.1, Q.932, Q.955.1, Q.2610, Q.2931 and Q.2971.

Which standards are used with SIST ETS 300 770-1:1998?

Standard	What it contributes
ETS 300 137	Functional capabilities and information flows for CUG in ISDN
ETS 300 138-1	DSS1 protocol for the ISDN CUG supplementary service
ETS 300 196-1	Generic functional protocol for DSS1 supplementary services
ETS 300 443-1	B-ISDN basic call/bearer control protocol used with point-to-point CUG
ETS 300 685-1	Use of cause and location in DSS2 and B-ISUP
ETS 300 771-1	B-ISDN point-to-multipoint call/bearer control protocol
ITU-T Recommendation I.130	The three-stage model for describing supplementary services
ITU-T Recommendation I.413	The TB and coincident SB/TB reference points
ITU-T Recommendation I.371	The B-ISDN basic service type context mentioned in the scope

What does the SIST ETS 300 770-1:1998 document contain?

The document contains the stage 3 protocol specification for CUG, together with the scope, normative references, and the endorsed modification text from ITU-T Recommendation Q.2955.1. It also includes the reference-substitution table that aligns the text with related ETSI and ITU-T documents. The foreword describes the six-part structure of the overall CUG standard and points readers to the later conformance-testing parts.

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; Closed User Group (CUG) supplementary service; Part 1: Protocol specification [ITU-T Recommendation Q.2955.1 (1996), modified]33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:ETS 300 770-1 E3SIST ETS 300 770-1:1998en01-DSULO19983SIST ETS 300 770-1:1998SLOVENSKI
STANDARD
DRAFTEUROPEANprETS 300 770-1TELECOMMUNICATIONOctober 1996STANDARDSource: ETSI TC-SPSReference: DE/SPS-05100-1ICS:33.080Key words:B-ISDN, DSS2, supplementary service, CUGBroadband Integrated Services Digital Network (B-ISDN);Digital Subscriber Signalling System No. two (DSS2) protocol;Closed User Group (CUG) supplementary service;Part 1: Protocol specification[ITU-T Recommendation Q.2955.1, 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 1996. All rights reserved.SIST ETS 300 770-1:1998

Page 2Draft prETS 300 770-1: October 1996ForewordThis draft European Telecommunication Standard (ETS) has been produced by the Signalling Protocolsand Switching (SPS) Technical Committee of the European Telecommunications Standards Institute(ETSI), and is now submitted for the Public Enquiry 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) ClosedUser Group (CUG) 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".NOTE:The final structure of the parts containing the test specifications is currently understudy.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 CUG supplementary service. The stage 1 and stage 2 aspects of the equivalent N-ISDNsupplementary service are detailed in ETS 300 136 and ETS 300 137, respectively, and these have beenassumed as appropriate to be the foundation of 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 doaWhilst 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 300 770-1:1998

Page 3Draft prETS 300 770-1: October 1996Endorsement noticeThe text of draft ITU-T Recommendation Q.2955.1 is proposed by ETSI as an ETS with agreedmodifications as given below.NOTE 1:New or modified text is indicated using sidebars. In addition, underlining and/or strike-out are used to highlight detailed modifications where necessary.NOTE 2:ITU-T Recommendation Q.2955.1 was not yet adopted by ITU-T prior to thesubmission for Public Enquiry of this ETS. This endorsement is based upon ITU-TStudy Group 11 Report COM 11-R 186-E (April 1996).subclause 1.1Replace subclause 1.1 by:1.1ScopeThis first part of ETS 300 770 specifies the stage three of the Closed User Group (CUG) 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 CUG supplementary service enables users to form groups, to and from which access is restricted. Aspecific user may be a member of one or more closed user groups. Members of a specific closed usergroup can communicate among themse
...

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74
Broadband Integrated Services Digital Network (B-ISDN); Digital Subscriber Signalling
System No. two (DSS2) protocol; Closed User Group (CUG) supplementary service; Part
1: Protocol specification [ITU-T Recommendation Q.2955.1 (1996), modified]
Ta slovenski standard je istoveten z: ETS 300 770-1 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 300 770-1
TELECOMMUNICATION May 1998
STANDARD
Source: SPS Reference: DE/SPS-05100-1
ICS: 33.020
Key words: B-ISDN, DSS2, supplementary service, CUG
Broadband Integrated Services Digital Network (B-ISDN);
Digital Subscriber Signalling System No. two (DSS2) protocol;
Closed User Group (CUG) supplementary service;
Part 1: Protocol specification
[ITU-T Recommendation Q.2955.1 (1996), 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 2
ETS 300 770-1: May 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) Closed
User Group (CUG) 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".
NOTE: The final structure of the parts containing the test specifications is currently under
study.
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 CUG supplementary service. The stage 1 and stage 2 aspects of the equivalent N-ISDN
supplementary service are detailed in ETS 300 136 and ETS 300 137, respectively, and these have been
assumed as appropriate to be the foundation of the equivalent B-ISDN supplementary service
specifications.
Transposition dates
Date of adoption of this ETS: 22 May 1998
Date of latest announcement of this ETS (doa): 31 August 1998
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 28 February 1999
Date of withdrawal of any conflicting National Standard (dow): 28 February 1999
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 3
ETS 300 770-1: May 1998
Endorsement notice
The text of ITU-T Recommendation Q.2955.1 (1996) 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.
subclause 1.1
Replace subclause 1.1 by:
1.1 Scope
This first part of ETS 300 770 specifies the stage three of the Closed User Group (CUG) 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 CUG supplementary service enables users to form groups, to and from which access is restricted. A
specific user may be a member of one or more closed user groups. Members of a specific closed user
group can communicate amon
...