SIST-TP ETSI/ETR 157-1 E1:2005

SLOVENSKI STANDARD
SIST-TP ETSI/ETR 157-1 E1:2005
01-april-2005
Širokopasovno digitalno omrežje z integriranimi storitvami (B-ISDN) -
Signalizacijske zahteve za storitve B-ISDN - 1. del: Nabor zmožnosti 2 (CS2)
Broadband Integrated Services Digital Network (B-ISDN); Signalling requirements for B-
ISDN services; Part 1: Capability Set 2 (CS2)
Ta slovenski standard je istoveten z: ETR 157-1 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST-TP ETSI/ETR 157-1 E1:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TP ETSI/ETR 157-1 E1:2005

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SIST-TP ETSI/ETR 157-1 E1:2005
ETSI ETR 157-1
TECHNICAL March 1996
REPORT
Source: ETSI TC-SPS Reference: DTR/SPS-03008-1
ICS: 33.080
B-ISDN, signalling, CS2
Key words:
Broadband Integrated Services Digital Network (B-ISDN);
Signalling requirements for B-ISDN services;
Part 1: Capability Set 2 (CS2)
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 - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16
*
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 1996. All rights reserved.

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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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Contents
Foreword .9
1 Scope .11
2 Abbreviations.11
3 B-ISDN signalling requirements objectives .12
3.1 B-ISDN Services Requirements .12
3.2 B-ISDN Bearer Services Signalling Requirements .13
3.3 ITU-T SG 13 Proposed Schedule for B-ISDN Signalling Capabilities .17
3.4 B-ISDN Signalling Capabilities.18
4 Information model .25
4.1 General .25
4.1.1 Object Modelling and Signalling Requirements.25
4.1.2 Views of a Call.25
4.2 Description of Objects in Information Model.26
4.2.1 Call .27
4.2.2 Remote Party .27
4.2.3 Attachment .27
4.2.4 Service Module.27
4.2.5 Service Component.27
4.2.6 Network Connection.28
4.2.7 Network Connection Group.28
4.2.8 Participation.28
4.3 Descriptions of Attributes.28
4.3.1 Attributes of Call Objects.28
4.3.1.1 Call Identifier (Call ID).28
4.3.1.2 List of Remote Parties .28
4.3.1.3 Local Party Address.28
4.3.1.4 Telecommunications Service Type.28
4.3.1.5 List of Service Components.28
4.3.1.6 List Network Connection Groups.28
4.3.2 Attributes of Remote Party Objects.28
4.3.2.1 Remote Party Reference Identifier .28
4.3.2.2 Remote Party Address.28
4.3.2.3 Remote Party Type.29
4.3.3 Attributes of Attachment Objects.29
4.3.4 Attributes of Service Module Objects .29
4.3.4.1 Service Module Identifier .29
4.3.4.2 List of Service Components.29
4.3.4.3 Multiplexing Method.29
4.3.5 Attributes of Service Component Objects .29
4.3.5.1 Service Component Identifier .29
4.3.5.2 Service Component Characteristics .29
4.3.5.3 Service Traffic Descriptor Requirements.29
4.3.5.4 Service QoS Descriptor Requirements.29
4.3.6 Attributes of Network Connection Objects .29
4.3.6.1 Network Connection Identifier .29
4.3.6.2 List of Service Modules.30
4.3.6.3 User (TE) - Oriented Low Layer Information .30
4.3.6.3.1 Network Layer Information.30
4.3.6.3.2 AAL Layer Information .30
4.3.6.4 Network-Oriented Low Layer Information.30
4.3.6.4.1 Network Layer Information.30
4.3.6.4.2 AAL Layer Information .30
4.3.6.4.3 ATM Layer Information .30

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4.3.6.4.4 Bearer Service Subcategory . 30
4.3.6.5 Directionality Indicator. 30
4.3.6.6 Transit Network Identifier. 30
4.3.6.7 ATM Connection Topology Type. 31
4.3.6.8 Local Attachment . 31
4.3.7 Attributes of Network Connection Group Objects. 31
4.3.7.1 Network Connection Group Identifier. 31
4.3.7.2 List of Network Connection Identifiers . 31
4.3.8 Attributes of Participation Objects. 31
5 Functional signalling model . 31
5.1 Description of the Stage 2 Functional Model. 31
5.2 Description of Functional Entities. 35
5.3 Information Flow Strata for Capability Set 2. 36
6 Information flow elements. 37
6.1 Information Flows and FE actions for Release 1 services . 37
6.2 Information Flow Conventions for Capability Set 2 services . 37
6.2.1 Convention of Reference Direction. 37
6.2.2 Convention for ATM Switch Through. 38
6.3 Description of Information Flows. 38
6.3.1 Call-&-Bearer-Setup Information Flow Sequence. 43
6.3.2 Call-Setup Information Flow Sequence . 43
6.3.3 Add-Bearer-to-Call Information Flow Sequence. 43
6.3.4 Add-Party-to-Bearer Information Flow Sequence. 43
6.3.5 Attach-Party-to-Bearer Information Flow Sequence. 43
6.3.6 Add-Party-to-Call Information Flow Sequence . 43
6.3.7 Add-Party-&-Bearer-to-Call Information Flow Sequence. 43
6.3.8 Detach-Party-from-Bearer . 43
6.3.9 Release-Bearer. 43
6.3.10 Release-Party-from-Call . 43
6.3.11 Release-Call . 43
6.3.12 Re-Negotiate-Bearer. 43
6.3.13 Modify-Bearer . 44
6.3.14 Call-&-Bearer-Setup-Remote. 44
6.3.15 Add-Bearer-to-Call-Remote. 44
6.3.16 Add-Party-to-Bearer-Remote. 44
6.3.17 Attach-Party-to-Bearer-Remote. 44
6.3.18 Add-Party-&-Bearer-to-Call-Remote. 44
6.3.19 Detach-Party-from-Bearer-Remote . 44
6.3.20 Release-Bearer-Remote. 44
6.3.21 Interrogation-Terminating-End-Point . 44
6.3.22 Look-Ahead . 44
6.3.23 Report-End/Edge . 45
6.3.24 Report-Link . 45
6.3.25 Notify-Party-Change . 45
6.3.26 Notify-Bearer-Change. 45
6.3.27 Notify-Bearer-Modified. 45
6.4 Relationship between Parameters of Information Flows and Stage 2 model . 45
6.5 Information Flow and Stage 2 Model. 47
6.6 Information Parameters for Information Flows. 48
7 Functional entity actions . 61
7.1 Simultaneous Call and Connection Establishment . 62
7.1.1 Call and Network Connection Group Establishment of Type 1
Connections. 62
7.1.1.1 Call and Network Connection Group Establishment -
Single Network Connection Group - Without "Look
Ahead". 62
7.1.1.2 Call and Network Connection Group Establishment -
Single Network Connection Group - With "Look Ahead" . 64
7.1.1.3 Call and Network Connection Group Establishment -
Single Network Connection Group - Third Party. 66

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7.1.2 Call and Network Connection Group Establishment of Type 2 Network
Connection Groups .69
7.1.2.1 Call and Network Connection Group Establishment Single
Network Connection Group - Originating Node Branch
Root Party.69
7.1.2.2 Call and Network Connection Group Establishment Single
Network Connection Group - Relay Node Branch Root .71
7.1.2.3 Call and Network Connection Group Establishment Single
Network Connection Group - Relay Node Branch Leaf.73
7.1.2.4 Call and Network Connection Group Establishment Single
Network Connection Group - Relay Node Branch Third.76
7.2 Addition of a new Network Connection (Group) to an existing Call with attachment of
existing Parties to the Network Connection (Group).78
7.2.1 Addition of a Type 1 Network Connection Group to an existing call .78
7.2.1.1 Addition of one point-to-point Network Connection Group
requested by the Call Initiating Party .79
7.2.1.2 Addition of an Network Connection Group to an existing
Call - Without "Look Ahead" and with Notify - With
Establishment of a new Route in the Network.80
7.2.1.3 Addition of an Network Connection Group to an existing
Call - Third Party.82
7.2.2 Addition of a Type 2 Network Connection Group to an existing call .85
7.2.2.1 Addition of an Network Connection Group to an existing
Call - Requesting Serving Node Branch Root Party .85
7.2.2.2 Addition of an Network Connection Group to an existing
Call - Relay Node Branch Root.87
7.3 Addition of one Network Connection to an Existing Network Connection Group with
attachment of existing Parties to the new Network Connection.89
7.3.1 Addition of one Type 1 Network Connection .89
7.3.1.1 Addition of one point-to-point Network Connection
requested by the Call Initiating Party .90
7.3.2 Addition of one Type 2 Network Connection .91
7.3.2.1 Addition of one point to multipoint Network Connection
requested by the Root of the new Network Connection .91
7.4 Addition of one or more new Parties to an Existing Call with Attachment to an Existing
Network Connection - With or without network Look-ahead.93
7.4.1 Addition of one or more new Parties and attachment to a Type 1 Network
Connection .93
7.4.1.1 Add one new Party requested by a Party which will be the
Root of the Type 1 Network Connection (without network
Look Ahead) .93
7.4.2 Addition of one or more new Parties and attachment to a Type 2 Network
Connection .95
7.4.2.1 Add one or more new Parties requested by the call
initiating Party .95
7.5 Attachment of one or more existing Parties to an existing Network Connection.95
7.5.1 Attachment of one or more existing Parties to a Type 1 Network
Connection .95
7.5.1.1 Attachment of one existing Party requested by a Party
which will be the Root of the Type 1 Network Connection.96
7.5.2 Attachment of one or more existing Parties to a Type 2 Network
Connection .97
7.5.2.1 Attachment of one existing Party requested by the call
initiating Party .97
7.6 Call Establishment without any Network Connection Group(s) .97
7.6.1 Two-Party Call-Only Establishment.98
7.6.2 Three-or-More-Party Call-Only Establishment .99
7.7 Addition of a Party to a Call without Attachment to any Network Connection Group(s) .100
7.8 Detachment of a Party from an Existing Connection.100
7.8.1 Detachment Requested by the Root of the Connection.100
7.8.1.1 Root Party Requests Detachment from the Connection.101
7.8.1.2 Root Party Requests that a Leaf be Detached from the
Connection.102

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7.8.2 Detachment Requested by a Leaf of the Connection. 102
7.8.2.1 A Leaf Party Requests that it be Detached from a
Connection. 103
7.8.2.2 A Leaf Party Requests that the Root be Detached from
the Connection. 104
7.8.2.3 A Leaf Party Requests a Leaf be Detached from the
Connection. 105
7.8.3 Detachment Requested by a Party not Attached to the Connection . 106
7.8.3.1 A Party Not Attached to a Connection Requests that the
Root Party be Detached. 106
7.8.3.2 A Party Not Attached to a Connection Requests that a
Leaf be Detached. 107
7.9 Release of the Connection from an Existing Call. 108
7.9.1 Release of a Point-to-point Connection from an existing Call . 108
7.9.2 Release of a Point-to-multi-point Connection from an Existing Call. 108
7.9.2.1 Release of a Connection requested by the Party
Associated with the Root. 109
7.9.2.2 Release of a Connection Requested by a Leaf Party that
is the Connection Owner. 110
7.9.2.3 Release of a Connection Requested by a Leaf Party that
is not the Connection Owner. 111
7.9.2.4 Release of a Connection Requested by a Party not
attached to the Connection . 112
7.10 Release of a Party from an existing call. 112
7.10.1 General rules for release of a Party. 112
7.10.2 Release of a Party from a Call requested by the Call or Party Owner. 113
7.10.2.1 Release of a Party that is the leaf party of a Type 2
Connection by the Call Owner . 113
7.10.3 Release of a Party from a Call requested by the Party to be released. 114
7.10.3.1 Release of a Party that is the Connection owner but not
the root of a Type 2 Connection. 114
7.11 Release of a Call. 114
7.11.1 General rules for releasing a call. 114
7.11.2 Release of a Call without any connections . 115
7.11.3 Release of a Call with multiple Type 1 connections . 116
7.11.3.1 Release of a Call with two Type 1 connections between
different Parties. 116
7.11.3.2 Release of a Call Requested by the Connection owner. 117
7.11.4 Release of a Call with Point to multipoint connections . 118
7.11.4.1 Release of a Call where the call owner is not the root of
the connection. 118
7.12 Look Ahead Procedures. 118
7.12.1 Look Ahead without State Change . 119
7.12.2 Look Ahead with State Change . 121
7.12.2.1 Human User Version. 121
7.12.2.2 Non-Human User Version. 123
8 Signalling interworking requirements. 124
8.1 Introduction. 124
8.1.1 Possible solutions . 124
8.1.2 Communication scenarios . 125
8.2 N-ISDN (64 kbit/s based) Interface Requirements. 126
8.2.1 Interworking requirements for Access signalling . 129
8.2.2 Interworking requirements for Network signalling. 129
8.3 Interworking of Release 1 and Release 2 . 130
8.3.1 Requirements for B-ISDN signalling protocol evolution. 130
8.3.2 Scenarios for Interworking. 130
8.3.2.1 Scenario A. 130
8.3.2.2 Scenario B. 131
8.3.2.3 Scenario C . 131
8.3.2.4 Scenario D . 132
8.3.3 Support of Release 2 services by using Release 1 equipment . 132

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Annex A: SDL diagrams supporting atomic actions .133
A.1 Introduction.133
A.2 Generic Information Model Object .135
A.3 FEA Application Part .137
A.4 SDL for Co-ordinators .139
A.5 SDL for a Subordinate.143
A.6 SDL for Superior.145
Annex B: General connection types for possible future application .146
Annex C: Bibliography .150
History.151

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Foreword
This ETSI Technical Report (ETR) has been produced by the Signalling Protocols and Switching (SPS)
Technical Committee of the European Telecommunications Standards Institute (ETSI). It is based on
contribution to ITU-T Study Group 11.
ETRs are informative documents resulting from ETSI studies which are not appropriate for European
Telecommunication Standard (ETS) or Interim European Telecommunication Standard (I-ETS) status. An
ETR may be used to publish material which is either of an informative nature, relating to the use or the
application of ETSs or I-ETSs, or which is immature and not yet suitable for formal adoption as an ETS or
an I-ETS.
This ETR is part 1 of a multi-part ETR covering the signalling requirements for B-ISDN services as
described below:
Part 1: "Capability Set 2 (CS2)";
NOTE: Additional parts may cover the further development of the B-ISDN services.

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1 Scope
This ETSI Technical Report (ETR) contains a description of the Broadband Integrated Services Digital
Network (B-ISDN) signalling requirements for Capability Set 2 (CS2). These requirements are to be used
in the development of the appropriate peer-to-peer and layer-to-layer signalling protocols. These
requirements are based on the requirements from ITU-T Study Groups 1 and 13, especially the available
stage 1 definitions listed in subclause 3.1.
The following services/capabilities are identified. These will impose signalling requirements in B-ISDN.
a) Establishment of on demand connections.
Demand a call between exactly two users which is supported by a single point-to-point connection.
b) Support of connections configurations on a point-to-point and point-to-multipoint basis.
c) Support of symmetric and asymmetric connections (e.g. low or zero bandwidth in one direction and
high bandwidths in the other).
d) To be able to establish a call and then later add bearers.
e) Specification of Quality of Service (QoS) class, etc.
NOTE: For integration of 64 kbit/s based N-ISDN services and B-ISDN with a broadband
signalling protocol, the supplementary services itemized in CCITT Recommendation
Q.767 according to the most recent stage 1 and stage 2 recommendation should be
supported.
2 Abbreviations
For the purposes of this ETR, the following abbreviations apply:
AAL ATM Adaptation Layer
AC Application Control
ATM Asynchronous Transfer Mode
B-ISDN Broadband Integrated Services Digital Network
BCLB Broadband ConnectionLess Bearer
BCOB Broadband Connection Oriented Bearer
CBR Constant Bit Rate
CC Call Control
CCR Commitment, Concurrency and Recovery
CRCG Common Route Connections Group
CS2 Capability Set 2
DC enD-to-end Control
DCA enD Control Agent
EC Edge-to-edge Control
FE Functional Entity
ID IDentifier
IN Intelligent Network
IWU Inter Working Unit
LBA Local Bearer Access
LC Link-by-link Control
LCA Link Control Agent
LEX Local EXchange
LLC Lower Layer Component
N-ISDN Narrowband ISDN
NA Not Applicable
NNI Network-Network Interface
NSAP Network Service Access Point
NT Network Termination
OAM Operations, Administration and Management
PC Presentation Control
PCA Presentation Control Agent
PDH Pleisiochronous Digital Hierarchy
PSTN Public Switched Telephone Network
QoS Quality of Service
RLS Release
SAP Service Access Point

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