SIST ETS 300 771-1:1998

• Abstract:

  B-ISDN UNI layer 3 signalling CS2 - step 1 at the UNI

• 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 300 771-1 ed.1 (1997-09) - Broadband Integrated Services Digital Network (B-ISDN); Digital Subscriber Signalling System No. two (DSS2) protocol; B-ISDN user-network interface layer 3 specification for point-to-multipoint call/bearer control; Part 1: Protocol specification [ITU-T Recommendation Q.2971 (1995), modified]

SIST ETS 300 771-1:1998 is the SIST version of ETS 300 771-1 for Broadband Integrated Services Digital Network (B-ISDN) signalling. It specifies the stage three protocol for point-to-multipoint call/bearer control at the B-ISDN user-network interface (UNI), including the procedures and switching functions needed to support the service. It is aimed at equipment and implementations that provide or use this access at the TB reference point, or at coincident SB and TB reference points.

What does SIST ETS 300 771-1:1998 specify?

SIST ETS 300 771-1:1998 specifies on-demand, connection-oriented, point-to-multipoint, unidirectional single bearer connection Release 1 basic telecommunication services for pan-European B-ISDN. It also sets protocol requirements for delivery at the TB reference point when the service is provided to the user via a private B-ISDN.

The standard applies to equipment that supports connection-oriented point-to-multipoint single-connection basic B-ISDN telecommunication services and is attached on either side of a TB reference point, or at coincident SB and TB reference points, when used as access to the public B-ISDN. The foreword also shows that this part is one of a multi-part standard, with further parts for conformance statements and test specifications.

What are the key requirements of SIST ETS 300 771-1:1998?

Clause 1 defines the service scope and the access points where the protocol applies. In practice, that tells implementers whether their B-ISDN access equipment falls inside the standard and whether the protocol must work at a public or private access boundary.

Clause 1 also says that support for the leaves of the point-to-multipoint connection depends on the basic point-to-point call/bearer connection protocol in ETS 300 443-1. That matters because a conforming implementation has to interwork with the underlying basic bearer control procedures.

Clause 3 adds a terminology note: ETSI uses bearer where ITU-T texts often use connection. That matters in reading and implementing the procedures, because the service context is a bearer service, not just a generic connection.

Clause 5.3 allows multiple ADD PARTY requests to be pending at the same time. In practice, the root node does not need to wait for one add-party response before sending the next request, so implementations can support faster party addition.

Clause 8.2.1 defines the Endpoint reference information element as the way to identify the individual endpoint to which a message applies, and Clause 8.2.4 adds cause value 89 for an invalid endpoint reference value. This matters for endpoint tracking and for error handling when a message points to the wrong party.

Clause 10.3.2 says that on ADD PARTY REJECT the recipient enters the Null party state, and if all parties are in Null, Drop Party Initiated, or Drop Party Received state, a RELEASE message is returned with cause #31. In practice, this sets the cleanup rule for the end of a multiparty call.

Clause 12 states that interaction with the Closed User Group (CUG) supplementary service follows ETS 300 770-1. That means CUG behavior is not handled in isolation and must be implemented together with the companion CUG signalling rules.

The state machine tables in Clause 13 and the Call-Control-N, Call-Control-U, Party-Control-N and Party-Control-U sheets refine message handling by state. For implementers, these tables are the operational rules for when messages such as DROP PARTY, RELEASE, and PARTY ALERTING are accepted and how the process moves to the next state.

What terms does SIST ETS 300 771-1:1998 define?

• Broadband Integrated Services Digital Network (B-ISDN) - The broadband ISDN environment for which the signalling protocol is defined.
• Digital Subscriber Signalling System No. two (DSS2) - The signalling system used to carry the UNI layer 3 protocol.
• User-Network Interface (UNI) - The interface between user equipment and the B-ISDN network.
• TB reference point - The reference point where the service is provided to the user in this standard.
• Protocol Implementation Conformance Statement (PICS) - The conformance statement used in the companion test material.
• Test Suite Structure and Test Purposes (TSS&TP) - The structure and stated purposes of the test suites in the companion parts.

Who uses SIST ETS 300 771-1:1998?

Telecom equipment vendors use this standard when implementing B-ISDN access and DSS2 signalling. Network engineers use it to define and verify call and party control behavior at the UNI.

Test engineers and conformance teams use it together with the PICS, TSS&TP, ATS and PIXIT companion parts to build and run tests. Buyers and quality managers can use it to check whether an access product supports the specific B-ISDN point-to-multipoint service they need.

What changed in SIST ETS 300 771-1:1998 from the previous edition?

SIST ETS 300 771-1:1998 is ETS 300 771-1 with agreed modifications to ITU-T Recommendation Q.2971 (1995). The document states these main changes:

• ETSI uses bearer instead of connection in the bearer-service context.
• Multiple ADD PARTY requests may be pending at the same time.
• The Endpoint reference and Endpoint state information elements were clarified and retitled in places.
• Cause value 89, “Invalid endpoint reference value,” was added.
• ADD PARTY REJECT and DROP PARTY behavior was adjusted, including the Null party state handling.
• Clause 12 adds the interaction rule for CUG supplementary service via ETS 300 770-1.
• Annex A was deleted, while annexes B, C, D and E are normative and annex F is informative.

Which standards are used with SIST ETS 300 771-1:1998?

• CCITT Recommendation I.130 - Defines how telecommunication services and network capabilities are characterized.
• ITU-T Recommendation I.413 - Defines the B-ISDN user-network interfaces and the TB/SB reference points.
• ETS 300 437-1 - Provides the SSCF at UNI for signalling support at the User-Network Interface.
• ETS 300 443-1 - Defines basic call/bearer control and supports the basic point-to-point bearer connection used by the leaves.
• ETS 300 661-1 to ETS 300 668-1 and ETS 300 770-1 - Provide the related DSS2 supplementary service protocols for DDI, MSN, CLIP, CLIR, COLP, COLR, SUB, UUS and CUG.
• ETS 300 685-1 - Defines the usage of cause and location in DSS2 and B-ISUP.

The foreword also identifies companion parts 2 to 6 for PICS, TSS&TP, ATS and partial PIXIT material for user and network testing.

What does the SIST ETS 300 771-1:1998 document contain?

The document contains the protocol specification itself, including procedure text, endpoint reference and endpoint state information elements, cause-value tables, and message-handling rules. It also includes figures and state sheets for Call-Control-N, Party-Control-N, Call-Control-U and Party-Control-U, which are used to define the allowed signaling behavior in each state.

It carries normative and informative annexes and informative appendices, together with the structured tables that drive conformance and implementation decisions. The practical use of these contents is to design, implement, and verify DSS2 point-to-multipoint call/bearer control at the UNI.

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; B-ISDN user-network interface layer 3 specification for point-to-multipoint call/bearer control; Part 1: Protocol specification [ITU-T Recommendation Q.2971 (1995), modified]33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:ETS 300 771-1 E13SIST ETS 300 771-1:1998en01-DSULO19983SIST ETS 300 771-1:1998SLOVENSKI
STANDARD
EUROPEANETS 300 771-1TELECOMMUNICATIONSeptember 1997STANDARDSource: SPSReference: DE/SPS-05085-1ICS:33.020Key words:B-ISDN, DSS2, UNI, layer 3, basicBroadband Integrated Services Digital Network (B-ISDN);Digital Subscriber Signalling System No. two (DSS2) protocol;B-ISDN user-network interface layer 3specification for point-to-multipoint call/bearer control;Part 1: Protocol specification[ITU-T Recommendation Q.2971 (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 300 771-1:1998

Page 2ETS 300 771-1: September 1997Whilst 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 "ETSIEditing and Committee Support Dept." at the address shown on the title page.SIST ETS 300 771-1:1998

Page 3ETS 300 771-1: September 1997ForewordThis European Telecommunication Standard (ETS) has been produced by the Signalling Protocols andSwitching (SPS) Technical Committee of the European Telecommunications Standards Institute (ETSI).This ETS is part 1 of a multi-part standard covering the specification of the Broadband Integrated ServicesDigital Network (B-ISDN) user-network interface layer 3 protocol for point-to-multipoint call/bearer controlof Digital Subscriber Signalling System No. two (DSS2) as described below:Part 1:"Protocol specification [ITU-T Recommendation Q.2971 (1995), modified]";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.Transposition datesDate of adoption:5 September 1997Date of latest announcement of this ETS (doa):31 December 1997Date of latest publication of new National Standardor endorsement of this ETS (dop/e):30 June 1998Date of withdrawal of any conflicting National Standard (dow):30 June 1998Endorsement noticeThe text of ITU-T Recommendation Q.2971 (1995) was approved by ETSI as an ETS with agreedmodifications 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.SIST ETS 300 771-1:1998

Page 4ETS 300 771-1: September 1997Page 1, clause 1Replace clause 1 by:1
ScopeThis European Telecommunication Standard (ETS) specifies the stage three of on-demand connection-oriented point-to-multipoint unidirectional single bearer connection Release 1 basic telecommunicationservices for the pan-European Broadband Integrated Services Digital Network (B-ISDN) as provided at theTB reference point or coincident SB and TB reference point (as defined in ITU-T RecommendationI.413 [2]) by means of the Digital Subscriber Signalling System No. two (DSS2) protocol. Stage threeidentifies the protocol procedures and switching functions needed to support a telecommunication service(see CCITT Recommendation I.130 [1]).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.NOTE:
Procedures at the TB reference point, to support the access of a private B-ISDN to thepublic B-ISDN, are not explicitly identified in this ETS, however, some procedures areapplicable only at the TB reference point.A basic telecommunication service is a service to which supplementary services may be added.Further ETSs (or further parts of this ETS) provide the method of testing and detailed application specificrequirements to determine conformance to this ETS.This ETS is applicable to equipment supporting connection-oriented point-to-multipoint single connectionbasic B-ISDN telecommunication services, to be attached at either side of a TB reference point orcoincident SB and TB reference points when used as an access to the public B-ISDN.The provision of this service to the leaves requires the support of the protocol for basic point-to-pointcall/bearer connection as defined in ETS 300 443-1 [4].Page 1, clause 2Replace clause 2 by:2
Normative referencesThis 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.[1]
CCITT Recommendation I.130 (1988): "Method for the characterization oftelecommunication services supported by an ISDN and network capabilities ofan ISDN".[2]
ITU-T Recommendation I.413 (1993): "B-ISDN user-network interfaces".[3]
ETS 300 437-1: "Broadband Integrated Services Digital Network (B-ISDN);Signalling ATM Adaptation Layer (SAAL); Service Specific Co-ordinationFunction (SSCF) for support of signalling at the User-Network Interface (UNI);Part 1: Specification of SSCF at UNI [ITU-T Recommendation Q.2130 (1995),modified]".SIST ETS 300 771-1:1998

Page 5ETS 300 771-1: September 1997[4]
ETS 300 443-1: "Broadband Integrated Services Digital Network (B-ISDN);Digital Subscriber Signalling System No. two (DSS2) protocol; B-ISDN user-network interface layer 3 specification for basic call/bearer control; Part 1:Protocol specification [ITU-T Recommendation Q.2931 (1995), modified]".[5]
ETS 300 661-1: "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-TRecommendation Q.2951, clause 1 (1995), modified]".[6]
ETS 300 662-1: "Broadband Integrated Services Digital Network (B-ISDN);Digital Subscriber Signalling System No. two (DSS2) protocol; MultipleSubscriber Number (MSN) supplementary service; Part 1: Protocol specification[ITU-T Recommendation Q.2951, clause 2 (1995), modified]".[7]
ETS 300 663-1: "Broadband Integrated Services Digital Network (B-ISDN);Digital Subscriber Signalling System No. two (DSS2) protocol; Calling LineIdentification Presentation (CLIP) supplementary service; Part 1: Protocolspecification [ITU-T Recommendation Q.2951, clause 3 (1995), modified]".[8]
ETS 300 664-1: "Broadband Integrated Services Digital Network (B-ISDN);Digital Subscriber Signalling System No. two (DSS2) protocol; Calling LineIdentification Restriction (CLIR) supplementary service; Part 1: Protocolspecification [ITU-T Recommendation Q.2951, clause 4 (1995), modified]".[9]
ETS 300 665-1: "Broadband Integrated Services Digital Network (B-ISDN);Digital Subscriber Signalling System No. two (DSS2) protocol; Connected LineIdentification Presentation (COLP) suppl
...

SLOVENSKI STANDARD
01-september-1998
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6SHFLILNDFLMDSURWRNRODSUHREOLNRYDQRSULSRURþLOR,7874
Broadband Integrated Services Digital Network (B-ISDN); Digital Subscriber Signalling
System No. two (DSS2) protocol; B-ISDN user-network interface layer 3 specification for
point-to-multipoint call/bearer control; Part 1: Protocol specification [ITU-T
Recommendation Q.2971 (1995), modified]
Ta slovenski standard je istoveten z: ETS 300 771-1 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 300 771-1
TELECOMMUNICATION September 1997
STANDARD
Source: SPS Reference: DE/SPS-05085-1
ICS: 33.020
Key words: B-ISDN, DSS2, UNI, layer 3, basic
Broadband Integrated Services Digital Network (B-ISDN);
Digital Subscriber Signalling System No. two (DSS2) protocol;
B-ISDN user-network interface layer 3
specification for point-to-multipoint call/bearer control;
Part 1: Protocol specification
[ITU-T Recommendation Q.2971 (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
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail]
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 1997. All rights reserved.

Page 2
ETS 300 771-1: September 1997
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.

Page 3
ETS 300 771-1: September 1997
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 specification of the Broadband Integrated Services
Digital Network (B-ISDN) user-network interface layer 3 protocol for point-to-multipoint call/bearer control
of Digital Subscriber Signalling System No. two (DSS2) as described below:
Part 1: "Protocol specification [ITU-T Recommendation Q.2971 (1995), modified]";
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.
Transposition dates
Date of adoption: 5 September 1997
Date of latest announcement of this ETS (doa): 31 December 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 June 1998
Date of withdrawal of any conflicting National Standard (dow): 30 June 1998
Endorsement notice
The text of ITU-T Recommendation Q.2971 (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.

Page 4
ETS 300 771-1: September 1997
Page 1, clause 1
Replace clause 1 by:
1     Scope
This European Telecommunication Standard (ETS) specifies the stage three of on-demand connection-
oriented point-to-multipoint unidirectional single bearer connection Release 1 basic telecommunication
services for the pan-European Broadband Integrated Services Digital Network (B-ISDN) as provided at the
T reference point or coincident S and T reference point (as defined in ITU-T Recommendation
B B B
I.413 [2]) by means of the Digital Subscriber Signalling System No. two (DSS2) protocol. Stage three
identifies the protocol procedures and switching functions needed to support a telecommunication service
(see CCITT Recommendation I.130 [1]).
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.
NOTE:     Procedures at the T reference point, to support the access of a private B-ISDN to the
B
public B-ISDN, are not explicitly identified in this ETS, however, some procedures are
applicable only at the T reference point.
B
A basic telecommunication service is a service to which supplementary services may be added.
Further ETSs (or further parts of this ETS) provide the method of testing and detailed application specific
requirements to determine conformance to this ETS.
This ETS is applicable to equipment supporting connection-oriented point-to-multipoint single connection
basic B-ISDN telecommunication services, to be attached at either side of a T reference point or
B
coincident S and T reference points when used as an access to the public B-ISDN.
B B
The provision of this service to the leaves requires the support of the protocol for basic point-to-point
call/bearer connection as defined in ETS 300 443-1 [4].
Page 1, clause 2
Replace clause 2 by:
2     Normative references
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.
[1]                   CCITT Recommendation I.130 (1988): "Method for the characterization of
telecommunication services supported by an ISDN and network capabilities of
an ISDN".
[2]                   ITU-T Recommendation I.413 (1993): "B-ISDN user-network interfaces".
[3]                   ETS 300 437-1: "Broadband Integrated Services Digital Network (B-ISDN);
Signalling ATM Adaptation Layer (SAAL); Service Specific Co-ordination
Function (SSCF) for support of signalling at the User-Network Interface (UNI);
Part 1: Specification of SSCF at UNI [ITU-T Recommendation Q.2130 (1995),
modified]".
Page 5
ETS 300 771-1: September 1997
[4]                   ETS 300 443-1: "Broadband Integrated Services Digital Network (B-ISDN);
Digital Subscriber Signalling System No. two (DSS2) protocol; B-ISDN user-
network interface layer 3 specification for basic call/bearer control; Part 1:
Protocol specification [ITU-T Recommendation Q.2931 (1995), modified]".
[5]                   ETS 300 661-1: "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]".
[6]                   ETS 300 662-1: "Broadband Integrated Services Digital Network (B-ISDN);
Digital Subscriber Signalling System No. two (DSS2) protocol; Multiple
Subscriber Number (MSN) supplementary service; Part 1: Protocol specification
[ITU-T Recommendation Q.2951, clause 2 (1995), modified]".
[7]                   ETS 300 663-1: "Broadband Integrated Services Digital Network (B-ISDN);
Digital Subscriber Signalling System No. two (DSS2) protocol; Calling Line
Identification Presentation (CLIP) supplementary service; Part 1: Protocol
specification [ITU-T Recommendation Q.2951, clause 3 (1995), modified]".
[8]                   ETS 300 664-1: "Broadband Integrated Services Digital Network (B-ISDN);
Digital Subscriber Signalling System No. two (DSS2) protocol; Calling Line
Identification Restriction (CLIR) supplementary service; Part 1: Protocol
specification [ITU-T Recommendation Q.2
...