SIST ETS 300 266:1997

SLOVENSKI STANDARD
SIST ETS 300 266:1997
01-maj-1997
Digitalno omrežje z integriranimi storitvami (ISDN) - Daljinska storitev:
videotelefonija - Funkcijske zmožnosti in informacijski tokovi
Integrated Services Digital Network (ISDN); Videotelephony teleservice; Functional
capabilities and information flows
Ta slovenski standard je istoveten z: ETS 300 266 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST ETS 300 266:1997 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 266:1997

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SIST ETS 300 266:1997
EUROPEAN ETS 300 266
TELECOMMUNICATION February 1994
STANDARD
Source: ETSI TC-SPS Reference: T/S 22-16
ICS: 33.080
ISDN, teleservice.
Key words:
Integrated Services Digital Network (ISDN);
Videotelephony teleservice
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 1994. All rights reserved.
New presentation - see History box

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ETS 300 266: February 1994
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.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 the functional entities.9
7 Information flows.9
7.1 Information flow diagrams.9
7.2 Definition of information flows.14
8 SDL diagrams for functional entities.15
8.1 SDL diagrams for FE1.16
8.2 SDL diagrams for FE2.20
8.3 SDL diagrams for FE3.23
8.4 SDL diagrams for FE4.25
8.5 SDL diagrams for FE5.28
9 Functional Entity Actions (FEAs).32
9.1 FEAs of FE1.32
9.2 FEAs of FE2.32
9.3 FEAs of FE3.32
9.4 FEAs of FE4.32
9.5 FEAs of FE5.32
10 Network physical location scenarios.32
History.33

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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 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
videotelephony teleservice. The stage 1 and stage 3 aspects are detailed in ETS 300 264 (1994) and
ETS 300 267-1 (1994), respectively.

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1 Scope
This ETS defines the stage two for the videotelephony teleservice of the pan-European Integrated
Services Digital Network (ISDN) as provided by European public telecommunications operators. The stage
two description identifies the functional capabilities and the information flows needed to support the service
description. The stage two description also identifies user operations not directly associated with a call
(see CCITT Recommendation I.130 [2]).
This ETS is specified according to the methodology specified in CCITT Recommendation Q.65 [4].
In addition, this ETS does not specify the requirements where the service is provided to the user via a
private ISDN. This ETS 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 ETS does not specify the additional requirements where the service is provided to the user via a
telecommunications network that is not an ISDN.
The videotelephony teleservice is a realtime, audiovisual teleservice in which speech and moving pictures
are interchanged by means of one or two 64 kbit/s circuit-mode connections in the ISDN. The picture
information transmitted is sufficient for adequate representation of fluid movements of a person displayed
in head and shoulders view.
Procedures for the correlation of two independent connections within the same videotelephony call are
outside the scope of this ETS. This places responsibility on the user of this service to avoid situations
where certain supplementary services are being used, and also situations where multiple calls are being
presented to the same user at the same time.
This ETS is applicable to the stage three standards for the ISDN videotelephony teleservice. 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, as a capability or
possibility, this shall be reflected in the text of the relevant stage three standards.
Furthermore, conformance to this ETS is met by conforming to the stage three standards with the field of
application appropriate to the equipment being implemented. Therefore, no method of testing is provided
for this ETS.
2 Normative references
This ETS incorporates by dated or 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.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 I.210 (1988): "Principles of telecommunication services
supported by an ISDN and the means used to describe them".
[4] CCITT Recommendation Q.65 (1988): "Stage 2 of the method for the
characterisation of services supported by an ISDN".
[5] CCITT Recommendation Q.71 (1988): "ISDN 64 kbit/s circuit-mode switched
bearer services".

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[6] CCITT Recommendation Z.100 (1988): "Functional Specification and Description
Language (SDL)".
[7] ETS 300 143: "Integrated Services Digital Network (ISDN); Audiovisual services;
Inband signalling procedures for audiovisual terminals using digital channels up to
2 048 kbit/s" (equivalent to ITU-T Recommendation H.242).
[8] ETS 300 144: "Integrated Services Digital Network (ISDN); Audiovisual services;
Frame structure for a 64 kbit/s to 1 920 kbit/s channel and associated syntax for
inband signalling" (equivalent to ITU-T Recommendation H.221).
3 Definitions
For the purposes of this ETS, the following definitions apply:
3,1 kHz terminal: a terminal that supports only the telephony 3,1 kHz teleservice.
7 kHz terminal: a terminal that supports the telephony 7 kHz teleservice.
Connection: see CCITT Recommendation I.112 [1], § 2.3, definition 309.
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.
Supplementary service: see CCITT Recommendation I.210 [3], § 2.4.
Teleservice: see CCITT Recommendation I.112 [1], § 2.2, definition 203.
Videotelephony terminal: a terminal that supports the videotelephony teleservice.
4 Symbols and abbreviations
For the purposes of this ETS, the following abbreviations apply:
CC Call Control
CCA Call Control Agent
FE Functional Entity
FEA Functional Entity Action
SDL Specification and Description Language
5 Description
Not applicable.
6 Derivation of the functional model
6.1 Functional model description
The functional model for the videotelephony teleservice is shown in figure 1.

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r3
r2
r1 r2
FE1 FE2 FE3 FE4
FE5
r1
r3
r2
r2
FE2' FE3'
FE4'
r4
NOTE: FE2', FE3' and FE4' relate to the provision of a second connection. FE2', FE3' and FE4' are
identical in functionality to that of FE2, FE3 and FE4 respectively, except as described in
Clauses 8 and 9.
Figure 1: Functional model
6.2 Description of the functional entities
The Functional Entities (FEs) required by the videotelephony teleservice are those of basic call and are as
follows:
FE1: Originating Call Control Agent (CCA);
FE2: Call Control (CC);
FE3: Call control;
FE4: Call control;
FE5: Terminating call control agent.
7 Information flows
The following information flow diagrams contain only the information flows modified for the videotelephony
teleservice. For the complete information flow diagrams, see CCITT Recommendation Q.71 [5]. Only the
additional functional entity actions are mentioned in the flow diagrams.
The interworking between a videotelephony terminal requesting a call based on using two circuit-mode
64 kbit/s connections and other terminals (e.g. 3,1 kHz terminal) is identical to the interworking between a
videotelephony terminal requesting a call based on using one circuit-mode 64 kbit/s connection and other
terminals.
7.1 Information flow diagrams
The information flows are shown in figures 2 to 5. The following information flows are depicted:
Figure 2: Call according to the videotelephony teleservice using two circuit-mode 64 kbit/s
connections;
Figure 3: Videotelephony terminal to 3,1 kHz terminal call setup (the calling videotelephony
terminal allows the fallback to the telephony 3,1 kHz teleservice);
Figure 4: Videotelephony terminal to 7 kHz terminal call setup (the calling videotelephony
terminal allows the fallback);
Figure 5: Videotelephony terminal capable of supporting two 64 kbit/s connections to a
videotelephony terminal capable of supporting only one 64 kbit/s connection call
setup.

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   r1       r2       r2       r3
FE1 --------------- FE2 --------------- FE3 --------------- FE4 --------------- FE5


     SETUP        SETUP        SETUP        SETUP
  >  >  >  >
     req.ind       req.ind       req.ind       req.ind
     (NOTE 1)      (NOTE 1)      (NOTE 1)      (NOTE 1)


  REPORT (alerting)  REPORT (alerting)  REPORT (alerting)  REPORT (alerting)
  <  <  <  <
     req.ind       req.ind       req.ind       req.ind



     SETUP        SETUP        SETUP        SETUP
  <  <  <  <
    resp.conf      resp.conf      resp.conf      resp.conf
    (NOTE 3)      (NOTE 3)      (NOTE 3)      (NOTE 3)


                 IN-BAND   NEGOTIATION     (NOTE 4)
812 <================  =================  =================  ================> 852




      r1       r2       r2      r3
  ---------------- FE2a --------------- FE3a --------------- FE4a ----------------

     SETUP        SETUP        SETUP        SETUP
813 > > > >
     req.ind       req.ind       req.ind       req.ind



     SETUP        SETUP        SETUP        SETUP
  <  <  <  <
    resp.conf      resp.conf      resp.conf      resp.conf
                                  (NOTE 2)


NOTE 1: For a call according to the videotelephony teleservice, the first connection request,
compatibility information indicates the videotelephony teleservice with fallback allowed to the
telephony 3,1 kHz teleservice.
NOTE 2: F
...