Integrated Services Digital Network (ISDN); Three-Party (3PTY) supplementary service; Functional capabilities and information flows

Stage 2 descriptions for priority 1 and 2 services covered in the MoU on ISDN

Digitalno omrežje z integriranimi storitvami (ISDN) - Dopolnilna storitev: konferenca treh (3PTY) - Funkcijske zmožnosti in informacijski tokovi

General Information

Status
Published
Publication Date
30-Apr-1997
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-May-1997
Due Date
01-May-1997
Completion Date
01-May-1997

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digitalno omrežje z integriranimi storitvami (ISDN) - Dopolnilna storitev: konferenca treh (3PTY) - Funkcijske zmožnosti in informacijski tokoviIntegrated Services Digital Network (ISDN); Three-Party (3PTY) supplementary service; Functional capabilities and information flows33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:ETS 300 187 E13SIST ETS 300 187:1997en01-MDQXDU19973SIST ETS 300 187:1997SLOVENSKI
STANDARD



SIST ETS 300 187:1997



EUROPEANETS 300 187TELECOMMUNICATIONAugust 1993STANDARDSource: ETSI TC-SPSReference: T/S 22-09ICS:33.080Key words:ISDN, supplementary service.Integrated Services Digital Network (ISDN);Three-Party (3PTY) supplementary serviceFunctional capabilities and information flowsETSIEuropean 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: secretariat@etsi.frTel.: +33 92 94 42 00 - Fax: +33 93 65 47 16Copyright 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 1993. All rights reserved.SIST ETS 300 187:1997



Page 2ETS 300 187: August 1993Whilst 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 300 187:1997



Page 3ETS 300 187: August 1993ContentsForeword.51Scope.72Normative references.73Definitions.84Symbols and abbreviations.85Description.86Derivation of the functional model.86.1Functional model description.86.2Description of functional entities.96.3Relationship with a basic service.97Information flows.97.1Information flow diagrams.97.2Definition of individual information flows.147.2.1Relationship ra.147.2.1.1Contents of 3-WAY START.147.2.1.2Contents of 3-WAY START REJECT.147.2.1.3Contents of 3-WAY END.147.2.2Relationship rb.158SDL diagrams for functional entities.158.1FE1.168.2FE2.228.3FE3a and FE3b.269Functional entity actions (FEAs).279.1FEAs of FE1.279.2FEAs of FE2.279.3FEAs of FE3 (i.e. FE3a and FE3b).2810Allocation of functional entities to physical locations.28History.29SIST ETS 300 187:1997



Page 4ETS 300 187: August 1993Blank pageSIST ETS 300 187:1997



Page 5ETS 300 187: August 1993ForewordThis European Telecommunication Standard (ETS) has been produced by the Signalling Protocols andSwitching (SPS) Technical Committee of the European Telecommunications Standards Institute (ETSI).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 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 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 2 aspects (functional capabilities and information flows) needed to support theThree-Party (3PTY) supplementary service. The stage 1 and stage 3 aspects are detailed in ETS 300 186(1993) and ETS 300 188 (1993), respectively.SIST ETS 300 187:1997



Page 6ETS 300 187: August 1993Blank pageSIST ETS 300 187:1997



Page 7ETS 300 187: August 19931ScopeThis standard defines the stage two of the Three-Party (3PTY) supplementary service for the pan-European Integrated Services Digital Network (ISDN) as provided by European public telecommunicationsoperators. Stage two identifies the functional capabilities and the information flows needed to support theservice as described in stage one. The stage two description also identifies user operations not directlyassociated with a call (see CCITT Recommendation I.130 [2]).This standard is specified according to the methodology specified in CCITT Recommendation Q.65 [3].In addition this standard does not specify the requirements where the service is provided to the user via aprivate ISDN. This standard does not specify the requirements for the allocation of defined functionalentities within a private ISDN, it does however define which functional entities may be allocated to a privateISDN.This standard does not specify the additional requirements where the service is provided to the user via atelecommunications network that is not an ISDN.The 3PTY supplementary service enables a user to establish, participate in and control, a three-wayconversation, i.e. a simultaneous communication involving the served user and two remote parties.The 3PTY supplementary service is applicable to all circuit-switched telecommunication services carryingspeech.This standard is the stage three standard for the ISDN 3PTY supplementary service. The term "stagethree" is also defined in CCITT Recommendation I.130 [2]. Where the text indicates the status of arequirement (i.e. as a strict command or prohibition, as authorisation leaving freedom, or as a capability orpossibility), this shall be reflected in the text of the relevant stage three standard.Furthermore, conformance to this standard is met by conforming to the stage three standard with the fieldof application appropriate to the equipment being implemented. Therefore, no method of testing is providedfor this standard.2Normative referencesThis standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate place in the text and the publications are listed hereafter.For dated references, subsequent amendments to or revisions of any of these publications apply to thisstandard only when incorporated in it by amendment or revision. For undated references the latest editionof the publication referred to applies.[1]CCITT Recommendation I.112 (1988): "Vocabulary of terms for ISDNs".[2]CCITT Recommendation I.130 (1988): "Method for the characterisation oftelecommunication services supported by an ISDN and network capabilities of anISDN".[3]CCITT Recommendation Q.65 (1988): "Stage 2 of the method for thecharacterisation of services supported by an ISDN".[4]CCITT Recommendation Q.71 (1988): "ISDN 64 kbits/s circuit mode switchedbearer service".[5]CCITT Recommendation Z.100 (1988): "Functional Specification and DescriptionLanguage (SDL)".SIST ETS 300 187:1997



Page 8ETS 300 187: August 19933DefinitionsFor the purposes of this standard, the following definitions apply:Integrated Services Digital Network (ISDN): see CCITT Recommendation I.112 [1], § 2.3,definition 308.Service; telecommunications service: see CCITT Recommendation I.112 [1], § 2.2, definition 201.Three-way conversation: communication between all three user's agents, i.e. the served users agent andthe two remote users agents.4Symbols and abbreviationsFor the purposes of this standard, the following abbreviations apply:3PTYThree-Party supplementary serviceCCCall ControlCCACall Control AgentFEFunctional EntityFEAFunctional Entity ActionISDNIntegrated Services Digital NetworkLELocal ExchangePTNXPrivate Telecommunications Network ExchangeSDLSpecification and Description LanguageTETerminal Equipment5DescriptionNot applicable.6Derivation of the functional model6.1Functional model descriptionThe functional model for the 3PTY supplementary service is shown in figure 1.ÚÄÄÄ¿
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Page 9ETS 300 187: August 19936.2Description of functional entitiesThe Functional Entities (FEs) required for the 3PTY supplementary service above those of the basic callare:FE1:Served user's agent;FE2:3PTY control entity;FE3:Remote user's agent.6.3Relationship with a basic serviceThe relationship of the 3PTY supplementary service with the basic service is shown in figure 2.NOTE:The basic call model is defined in CCITT Recommendation Q.71 [4], § 3.2.1, with theexception that r1 represents an outgoing call relationship from a Call Control Agent(CCA) and r3 represents an incoming call relationship to a CCA.ÚÄÄÄÄÄ¿
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Page 10ETS 300 187: August 1993
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...

SLOVENSKI STANDARD
SIST ETS 300 187:1997
01-maj-1997
Digitalno omrežje z integriranimi storitvami (ISDN) - Dopolnilna storitev:
konferenca treh (3PTY) - Funkcijske zmožnosti in informacijski tokovi
Integrated Services Digital Network (ISDN); Three-Party (3PTY) supplementary service;
Functional capabilities and information flows
Ta slovenski standard je istoveten z: ETS 300 187 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST ETS 300 187:1997 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST ETS 300 187:1997

---------------------- Page: 2 ----------------------

SIST ETS 300 187:1997
EUROPEAN ETS 300 187
TELECOMMUNICATION August 1993
STANDARD
Source: ETSI TC-SPS Reference: T/S 22-09
ICS: 33.080
ISDN, supplementary service.
Key words:
Integrated Services Digital Network (ISDN);
Three-Party (3PTY) supplementary service
Functional capabilities and information flows
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 1993. All rights reserved.
New presentation - see History box

---------------------- Page: 3 ----------------------

SIST ETS 300 187:1997
Page 2
ETS 300 187: August 1993
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: 4 ----------------------

SIST ETS 300 187:1997
Page 3
ETS 300 187: August 1993
Contents
Foreword.5
1 Scope .7
2 Normative references .7
3 Definitions.8
4 Symbols and abbreviations.8
5 Description .8
6 Derivation of the functional model .8
6.1 Functional model description .8
6.2 Description of functional entities .9
6.3 Relationship with a basic service .9
7 Information flows.9
7.1 Information flow diagrams.9
7.2 Definition of individual information flows.14
7.2.1 Relationship ra.14
7.2.1.1 Contents of 3-WAY START. 14
7.2.1.2 Contents of 3-WAY START REJECT .14
7.2.1.3 Contents of 3-WAY END.14
7.2.2 Relationship rb.15
8 SDL diagrams for functional entities.15
8.1 FE1.16
8.2 FE2.22
8.3 FE3a and FE3b.26
9 Functional entity actions (FEAs).27
9.1 FEAs of FE1.27
9.2 FEAs of FE2.27
9.3 FEAs of FE3 (i.e. FE3a and FE3b).28
10 Allocation of functional entities to physical locations.28
History.29

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SIST ETS 300 187:1997
Page 4
ETS 300 187: August 1993
Blank page

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SIST ETS 300 187:1997
Page 5
ETS 300 187: August 1993
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).
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 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 2 aspects (functional capabilities and information flows) needed to support the
Three-Party (3PTY) supplementary service. The stage 1 and stage 3 aspects are detailed in ETS 300 186
(1993) and ETS 300 188 (1993), respectively.

---------------------- Page: 7 ----------------------

SIST ETS 300 187:1997
Page 6
ETS 300 187: August 1993
Blank page

---------------------- Page: 8 ----------------------

SIST ETS 300 187:1997
Page 7
ETS 300 187: August 1993
1 Scope
This standard defines the stage two of the Three-Party (3PTY) supplementary service for the pan-
European Integrated Services Digital Network (ISDN) as provided by European public telecommunications
operators. Stage two identifies the functional capabilities and the information flows needed to support the
service as described in stage one. The stage two description also identifies user operations not directly
associated with a call (see CCITT Recommendation I.130 [2]).
This standard is specified according to the methodology specified in CCITT Recommendation Q.65 [3].
In addition this standard does not specify the requirements where the service is provided to the user via a
private ISDN. This standard does not specify the requirements for the allocation of defined functional
entities within a private ISDN, it does however define which functional entities may be allocated to 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.
The 3PTY supplementary service enables a user to establish, participate in and control, a three-way
conversation, i.e. a simultaneous communication involving the served user and two remote parties.
The 3PTY supplementary service is applicable to all circuit-switched telecommunication services carrying
speech.
This standard is the stage three standard for the ISDN 3PTY supplementary service. The term "stage
three" is also defined in CCITT Recommendation I.130 [2]. Where the text indicates the status of a
requirement (i.e. as a strict command or prohibition, as authorisation leaving freedom, or as a capability or
possibility), this shall be reflected in the text of the relevant stage three standard.
Furthermore, conformance to this standard is met by conforming to the stage three standard with the field
of application appropriate to the equipment being implemented. Therefore, no method of testing is provided
for this standard.
2 Normative references
This standard incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate place 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
standard 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.112 (1988): "Vocabulary of terms for ISDNs".
[2] CCITT Recommendation I.130 (1988): "Method for the characterisation of
telecommunication services supported by an ISDN and network capabilities of an
ISDN".
[3] CCITT Recommendation Q.65 (1988): "Stage 2 of the method for the
characterisation of services supported by an ISDN".
[4] CCITT Recommendation Q.71 (1988): "ISDN 64 kbits/s circuit mode switched
bearer service".
[5] CCITT Recommendation Z.100 (1988): "Functional Specification and Description
Language (SDL)".

---------------------- Page: 9 ----------------------

SIST ETS 300 187:1997
Page 8
ETS 300 187: August 1993
3 Definitions
For the purposes of this standard, the following definitions apply:
Integrated Services Digital Network (ISDN): see CCITT Recommendation I.112 [1], § 2.3,
definition 308.
Service; telecommunications service: see CCITT Recommendation I.112 [1], § 2.2, definition 201.
Three-way conversation: communication between all three user's agents, i.e. the served users agent and
the two remote users agents.
4 Symbols and abbreviations
For the purposes of this standard, the following abbreviations apply:
3PTY Three-Party supplementary service
CC Call Control
CCA Call Control Agent
FE Functional Entity
FEA Functional Entity Action
ISDN Integrated Services Digital Network
LE Local Exchange
PTNX Private Telecommunications Network Exchange
SDL Specification and Description Language
TE Terminal Equipment
5 Description
Not applicable.
6 Derivation of the functional model
6.1 Functional model description
The functional model for the 3PTY supplementary service is shown in figure 1.
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‡FE1ˆ˜˜˜˜˜˜·FE2ˆ˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·FE3a‡
‡  ‡   ‡  ˆ˜˜˜˜˜˜¿        ‡  ‡
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Figure 1: Functional model

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SIST ETS 300 187:1997
Page 9
ETS 300 187: August 1993
6.2 Description of functional entities
The Functional Entities (FEs) required for the 3PTY supplementary service above those of the basic call
are:
FE1: Served user's agent;
FE2: 3PTY control entity;
FE3: Remote user's agent.
6.3 Relationship with a basic service
The relationship of the 3PTY supplementary service with the basic service is shown in figure 2.
NOTE: The basic call model is defined in CCITT Recommendation Q.71 [4], § 3.2.1, with the
exception that r1 represents an outgoing call relationship from a Call Control Agent
(CCA) and r3 represents an incoming call relationship to a CCA.
�˜˜˜˜˜¿   �˜˜˜˜˜¿         rb        �˜˜˜˜˜¿
‡   ‡ ra ‡   ˆ˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·   ‡
‡ FE1 ˆ˜˜˜˜˜˜· FE2 ˆ˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜¿          ‡ FE3a‡
ˆ˜˜˜˜˜· r1 ˆ˜˜˜˜˜· r2  �˜˜˜˜¿ ‡ r2  �˜˜˜˜¿ r3 ˆ˜˜˜˜˜·
‡ CCA ˆ˜˜˜˜˜˜· CC ˆ˜˜˜˜˜˜˜· CC ˆ˜˜¯˜˜˜˜˜˜˜· CC ˆ˜˜˜˜˜˜· CCA ‡
ˆ˜˜˜˜˜· r1 ˆ˜˜˜˜˜· r2  �˜˜˜˜� ‡    �˜˜˜˜�   �˜˜˜˜˜�
‡ CCA ˆ˜˜˜˜˜˜· CC ˆ˜˜˜˜¿     ‡ rb        �˜˜˜˜˜¿
�˜˜˜˜˜�   �˜˜˜˜˜�  ‡     �˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·   ‡
            ‡               ‡ FE3b‡
            ‡ �˜˜˜˜¿   r2  �˜˜˜˜¿ r3 ˆ˜˜˜˜˜·
            �˜˜· CC ˆ˜˜˜˜˜˜˜˜˜˜· CC ˆ˜˜˜˜˜˜· CCA ‡
              �˜˜˜˜�     �˜˜˜˜�   �˜˜˜˜˜�
Figure 2
7 Information flows
7.1 Information flow diagrams
The information flows for the 3PTY supplementary service are shown in figures 3 to 7 for the following
procedures:
Figure 3: Begin three-way conversation;
Figure 4: Create private communication (two cases);
Figure 5: Disconnect call by remote user whilst in three-way conversation mode;
Figure 6: Disconnect call by served user whilst in three-way conversation mode;
Figure 7: Disconnect entire call by served user whilst in three-way conversation mode.
NOTE: The information flow diagrams for the clearing of connections are provided in CCITT
Recommendation Q.71 [4].

---------------------- Page: 11 ----------------------

SIST ETS 300 187:1997
Page 10
ETS 300 187: August 1993
                      rb
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   ‡ FE1 ‡---------‡ FE2 ‡-------‡ FE3a ‡      ‡ FE3b ‡
   �´˜˜˜˜´�     �´˜˜˜˜´�    �´˜˜˜˜´�      �´˜˜˜˜´�
3-WAY ‡  ‡      ‡  ‡     ‡  ‡       ‡  ‡
START ‡  ‡      ‡  ‡     ‡  ‡       ‡  ‡
˜˜˜˜˜˜>¯˜˜˜˜·      ‡  ‡     ‡  ‡       ‡  ‡
req. ‡910 ‡      ‡  ‡     ‡  ‡       ‡  ‡
    ‡912 ‡3-WAY START‡  ‡     ‡  ‡       ‡  ‡
    ˆ˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜>¯˜˜˜˜·     ‡  ‡       ‡  ‡
    ‡  ‡ req.ind ‡920 ‡     ‡  ‡       ‡  ‡
    ‡  ‡      ‡921 ‡     ‡  ‡       ‡  ‡
    ‡  ‡      ‡922 ‡     ‡  ‡       ‡  ‡
    ‡  ‡      ‡926 ‡     ‡  ‡       ‡  ‡
    ‡  ‡3-WAY START‡928 ‡     ‡  ‡       ‡  ‡
    ˆ˜˜˜˜·<˜˜˜˜˜˜˜˜˜˜¯˜˜˜˜·     ‡  ‡       ‡  ‡
    ‡910 ‡ resp.conf ‡929 ‡INFORM 1 ‡  ‡       ‡  ‡
    ‡  ‡      ˆ˜˜˜˜¯˜˜˜˜˜˜˜˜>ˆ˜˜˜˜·       ‡  ‡
    ‡  ‡      ‡  ‡ req.ind ‡931 ‡INFORM1   ‡  ‡
    ‡  ‡      ‡  ‡     ˆ˜˜˜˜¯˜˜˜˜˜˜˜>   ‡  ‡
    ‡  ‡      ‡  ‡     ‡  ‡ ind.    ‡  ‡
    ‡  ‡      ‡  ‡     ‡  ‡       ‡  ‡
    ‡  ‡      ‡929 ‡     ‡  ‡ INFORM1  ‡  ‡
3-WAY ‡  ‡      ˆ˜˜˜˜¯˜˜˜˜˜˜˜˜˜·  ˆ˜˜˜˜˜˜˜˜˜˜˜˜>ˆ˜˜˜˜·
START ‡  ‡      ‡  ‡     ‡  ‡ req.ind  ‡931 ‡INFORM1
<˜˜˜˜˜˜¯˜˜˜˜·      ‡  ‡     ‡  ‡       ˆ˜˜˜˜¯˜˜˜˜˜˜˜>
conf. ‡  ‡      ‡  ‡     ‡  ‡       ‡  ‡ind.
    �˜˜˜˜�      �˜˜˜˜�     �˜˜˜˜�       �˜˜˜˜�
Figure 3: Begin three-way conversation

---------------------- Page: 12 ----------------------

SIST ETS 300 187:1997
Page 11
ETS 300 187: August 1993
                      rb
             �˜-------------------------------˜¿
             |                 |
   �˜˜˜˜˜˜¿  ra  �˜˜˜˜˜˜¿ rb  �˜˜˜˜˜˜¿      �˜˜˜˜˜˜¿
   ‡ FE1 ‡---------‡ FE2 ‡-------‡ FE3a ‡      ‡ FE3b ‡
   �´˜˜˜˜´�     �´˜˜˜˜´�    �´˜˜˜˜´�      �´˜˜˜˜´�
3-WAY ‡  ‡      ‡  ‡     ‡  ‡       ‡  ‡
END  ‡  ‡      ‡  ‡     ‡  ‡       ‡  ‡
˜˜˜˜˜˜>¯˜˜˜˜·      ‡  ‡     ‡  ‡       ‡  ‡
req. ‡  ‡      ‡  ‡     ‡  ‡       ‡  ‡
    ‡911 ‡3-WAY END ‡  ‡     ‡  ‡       ‡  ‡
    ˆ˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜>ˆ˜˜˜˜·     ‡  ‡       ‡  ‡
    ‡  ‡ req.ind ‡927 ‡     ‡  ‡       ‡  ‡
    ‡  ‡      ‡923 ‡     ‡  ‡       ‡  ‡
    ‡911 ‡3-WAY END ‡  ‡     ‡  ‡       ‡  ‡
    ˆ˜˜˜˜·<˜˜˜˜˜˜˜˜˜˜¯˜˜˜˜·     ‡  ‡       ‡  ‡
    ‡  ‡ resp.conf ‡929 ‡     ‡  ‡       ‡  ‡
    ‡  ‡      ‡  ‡INFORM3 ‡  ‡       ‡  ‡
    ‡  ‡      ˆ˜˜˜˜¯˜˜˜˜˜˜˜˜>ˆ˜˜˜˜·       ‡  ‡
    ‡  ‡      ‡  ‡ req.ind ‡933 ‡INFORM3   ‡  ‡
    ‡  ‡      ‡  ‡     ˆ˜˜˜˜¯˜˜˜˜˜˜˜>   ‡  ‡
    ‡  ‡      ‡  ‡     ‡  ‡ ind     ‡  ‡
    ‡  ‡      ‡  ‡     ‡  ‡       ‡  ‡
    ‡  ‡      ‡929 ‡     ‡  ‡ INFORM2  ‡  ‡
    ‡  ‡      ˆ˜˜˜˜¯˜˜˜˜˜˜˜˜˜·  ˆ˜˜˜˜˜˜˜˜˜˜˜˜>ˆ˜˜˜˜·
    ‡  ‡      ‡  ‡     ‡  ‡ req.ind  ‡932 ‡INFORM2
    ‡  ‡      ‡  ‡     ‡  ‡       ˆ˜˜˜˜¯˜˜˜˜˜˜˜>
    ‡  ‡      ‡  ‡     ‡  ‡       ‡  ‡ind.
    ‡914 ‡      ‡924 ‡     ‡  ‡       ‡  ‡
    ‡  ‡      ‡929 ‡     ‡  ‡ INFORM3  ‡  ‡
    ‡  ‡      ˆ˜˜˜˜¯˜˜˜˜˜˜˜˜˜·  ˆ˜˜˜˜˜˜˜˜˜˜˜˜>ˆ˜˜˜˜·
    ‡  ‡      ‡  ‡     ‡  ‡ req.ind  ‡934 ‡INFORM3
    ‡  ‡      ‡  ‡     ‡  ‡       ˆ˜˜˜˜¯˜˜˜˜˜˜˜>
    ‡  ‡      ‡  ‡     ‡  ‡       ‡  ‡ind.
    ‡  ‡      ‡929 ‡ INFORM2 ‡  ‡       ‡  ‡
3-WAY ‡  ‡      ˆ˜˜˜˜¯˜˜˜˜˜˜˜˜>ˆ˜˜˜˜·       ‡  ‡
END  ‡911 ‡      ‡  ‡ req.ind ‡932 ‡ INFORM2   ‡  ‡
<˜˜˜˜˜˜¯˜˜˜˜·      ‡  ‡     ˆ˜˜˜˜¯˜˜˜˜˜˜˜˜>  ‡  ‡
conf. ‡  ‡      ‡  ‡     ‡  ‡ ind.
...

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