ETSI ETS 300 264 ed.1 (1994-03)

Integrated Services Digital Network (ISDN); Videotelephony teleservice; Service description

DE/NA-012231

Digitalno omrežje z integriranimi storitvami (ISDN) – Daljinske storitve: videotelefonija – Opis storitve

General Information

• Status: Published
• Publication Date: 08-Mar-1994
• Technical Committee: NA 1 - User Interfaces, Services and Charging
• Current Stage: 12 - Completion
• Due Date: 10-Feb-1994
• Completion Date: 09-Mar-1994
• Ref Project: SIST ETS 300 264 E1:2003 - Integrated Services Digital Network (ISDN); Videotelephony teleservice; Service description

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 264 E1:2003
01-december-2003
Digitalno omrežje z integriranimi storitvami (ISDN) – Daljinske storitve:
videotelefonija – Opis storitve
Integrated Services Digital Network (ISDN); Videotelephony teleservice; Service
description
Ta slovenski standard je istoveten z: ETS 300 264 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST ETS 300 264 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 264 E1:2003
EUROPEAN ETS 300 264
TELECOMMUNICATION March 1994
STANDARD
Source: ETSI TC-NA Reference: DE/NA-012231
ICS: 33.080
ISDN, videotelephony
Key words:
Integrated Services Digital Network (ISDN);
Videotelephony teleservice
Service description
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 - [e-mail]
X.400: Internet:
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 1994. All rights reserved.
New presentation - see History box

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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 .5
1 Scope .7
2 Normative references.7
3 Definitions.9
4 Symbols and abbreviations .9
5 Description .10
6 Procedures.10
6.1 Provision and withdrawal .10
6.2 Normal procedures .11
6.2.1 Originating the call (call establishment).12
6.2.2 Indications during call establishment.12
6.2.3 Terminating the call.12
6.2.4 Change of communication mode .13
6.3 Exceptional procedures .13
6.3.1 Situations at the calling user side.13
6.3.2 Situations at the called user side.13
6.3.3 Situations due to network conditions.13
6.3.4 Retention of call information.13
7 Intercommunication and interworking considerations .14
7.1 Fall-back procedures .14
7.1.1 Fall-back to the telephony 3,1 kHz teleservice.14
7.1.1.1 Procedures .14
7.1.1.2 Interworking with non-ISDNs .15
7.1.2 Fall-back to the telephony 7 kHz teleservice.15
7.2 Interworking with private ISDNs.15
8 Applicability of supplementary services.15
9 Static description of the service using attributes .16
9.1 Low layer attributes.16
9.1.1 Information transfer attributes .16
9.1.2 Access attributes.17
9.2 High layer attributes .18
9.3 General attributes .18
10 Dynamic description.18
Annex A (informative): Bibliography.19
Annex B (informative): Applicability of supplementary services to the videotelephony teleservice.20
B.1 Introduction.20
B.2 Principles adopted.20
B.3 Applicability of individual supplementary services.20
History.21

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Foreword
This European Telecommunication Standard (ETS) has been produced by the Network Aspects (NA)
Technical Committee of the European Telecommunications Standards Institute (ETSI).
In accordance with CCITT Recommendation I.130 [1], the following three level structure is used to
describe the supplementary telecommunications 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 1 aspects (overall service description) for the videotelephony teleservice. The
stage 2 and stage 3 aspects are detailed in ETS 300 266 (1994) and ETS 300 267 (1994), respectively.

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1 Scope
This standard defines the stage one of the videotelephony teleservice for the pan-European Integrated
Services Digital Network (ISDN) as provided by European public telecommunications operators.
Stage one is an overall service description from the user's point of view (see CCITT Recommendation
I.130 [1]), but does not deal with the details of the human interface itself.
This standard defines the interworking requirements of private ISDNs with the public ISDN.
In addition, this standard specifies the base functionality where the service is provided to the user via 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 but does include interworking requirements of other
networks with the public ISDN.
Charging principles are outside the scope of this standard.
The values of the general attributes are outside the scope of this standard.
The videotelephony teleservice is a real-time 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.
This standard is applicable to the stage two and stage three standards for the videotelephony teleservice.
The terms "stage two" and "stage three" are also defined in CCITT Recommendation I.130 [1]. Where the
text indicates the status of a requirement (i.e. as 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 two and
stage three standards.
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 and by conforming to the standards on the
end-to-end characteristics 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 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 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.130 (1988): "Method for the characterization of
telecommunication services supported by an ISDN and network capabilities of
an ISDN".
[2] CCITT Recommendation I.112 (1988): "Vocabulary of terms for ISDNs".
[3] CCITT Recommendation I.210 (1988): "Principles of telecommunication
services supported by an ISDN and the means to describe them".
[4] CCITT Recommendation G.711 (1988): "Pulse code modulation (PCM) of voice
frequencies".
[5] CCITT Recommendation G.722: "7 kHz audio-coding within 64 kbit/s".
[6] ETS 300 111 (1992): "Integrated Services Digital Network (ISDN); Telephony
3,1 kHz teleservice Service description".

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[7] CCITT Recommendation I.220 (1988): "Common dynamic description of basic
telecommunication services".
[8] CCITT Recommendation E.164 (1991): "Numbering plan for the ISDN era".
[9] CCITT Recommendation I.140 (1988): "Attribute technique for the
characterisation of telecommunication services supported by an ISDN and
network capabilities of an ISDN".
[10] CCITT Recommendation I.221 (1988): "Common specific characteristics of
services".
[11] prETS 300 142: "Integrated Services Digital Network (ISDN) and other digital
telecommunications networks; Audiovisual teleservices Video codec for
audiovisual services at p * 64 kbit/s".
[12] prETS 300 143: "Integrated Services Digital Network (ISDN) and other digital
communications networks; Audiovisual teleservices System for establishing
communication between audiovisual terminals using digital channels up to
2 048 kbit/s".
[13] prETS 300 144: "Integrated Services Digital Network (ISDN) and other digital
telecommunications networks; Audiovisual teleservices Frame structure for a 64
to 1 920 kbit/s channels in audiovisual service".
[14] prETS 300 145: "Integrated Services Digital Network (ISDN) and other digital
telecommunications networks; Audiovisual teleservices Narrowband audiovisual
telephone systems".
[15] CCITT Recommendation G.728 (1992): "Coding of speech at 16 kbit/s using
low-delay code-excited linear prediction".
[16] prI-ETS 300 302-1: "Integrated Services Digital Network (ISDN); Videotelephony
teleservice Part 1: Electroacoustic characteristics for handset terminals when
using Pulse Code Modulation (PCM) encoding".

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3 Definitions
For the purposes of this standard the following definitions apply:
Integrated Services Digital Network (ISDN): see CCITT Recommendation I.112 [2], § 2.3, definition
308.
Service; telecommunications service: see CCITT Recommendation I.112 [2], § 2.2, definition 201.
Supplementary service: see CCITT Recommendation I.210 [3], § 2.4.
Teleservice: see CCITT Recommendation I.112 [2], § 2.2, definition 203.
Fall-back: the mechanism whereby a request for the videotelephony teleservice, which includes an
indication that an alternative teleservice is acceptable, results in a call using the alternative teleservice.
Call 1: the first call established for the videotelephony teleservice i.e. it is the first 64 kbit/s connection
established between the two users. Call 1 is established for both cases of the videotelephony teleservice.
Call 2: the second call established for the videotelephony teleservice i.e. it is the second 64 kbit/s
connection between the two users. Call 2 is established only for case II of the videotelephony teleservice.
Retention timer: this timer specifies the amount of time that the network retains all of the call information
supplied by the calling user when the call encounters busy or is terminated. Implementation of this timer is
a network option. The value of this timer shall be greater than 15 seconds.
Videotelephone terminal: a terminal that supports the videotelephony teleservice.
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.
ISDN number: a number conforming to the numbering plan and structure specified in CCITT
Recommendation E.164 [8].
Served user: a user to whom the videotelephony teleservice is provided.
Network determined user busy: see CCITT Recommendation I.221 [10], § 3.1.4.
User determined user busy: see CCITT Recommendation I.221 [10], § 3.1.4.
Videotelephony communication: instance of a videotelephony teleservice based on one single call
(case I) or two calls (case II).
4 Symbols and abbreviations
ISDN Integrated Services Digital Network
PSTN Public Switched Telephone Network

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5 Description
The videotelephony teleservice is a real-time 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 videotelephony teleservice comprises two cases:
- case I: videotelephony based on using one circuit-mode 64 kbit/s connection; and
- case II: videotelephony based on using two circuit-mode 64 kbit/s connections.
The videotelephony teleservice is characterised by the transmission of moving pictures simultaneously
with speech.
The speech quality of the videotelephony teleservice shall comply with the requirements contained in
I-ETS 300 302-1 [16].
The videotelephony teleservice shall allow the communication between:
- two users in a point-to-point configuration; and
- as a service provider option, three or more users in a multipoint configuration as invoked by some
supplementary services.
Videotelephone terminals shall be capable of supporting the telephony 3,1 kHz teleservice.
User information shall be transferred over the B-channel, signalling shall be provided over the D-channel.
The network provides tones and/or announcements to support this teleservice. Tones and/or
announcements can be used to indicate the progress (or lack of progress) of a call. The application and
meaning of the tones and announcements is a national matter and outside the scope of this standard.
6 Procedures
6.1 Provision and withdrawal
The videotelephony teleservice shall either be provided after prior arrangement with the service provider,
or shall be generally available.
NOTE: As a service provider option, the videotelephony teleservice can be offered with
several subscription options which apply separately to each ISDN number, or groups
of ISDN numbers on the interface. For each subscription option, only one value can be
selected.
It should be noted that in this context an interface may consist of a group of physical
interfaces.
Subscription options for the interface are summarised in table 1.

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Table 1: Subscription options for the interface
Subscription option Value
Maximum number of information m, where m is not greater than the
channels available number of information channels on
the interface
Maximum number of total calls n, where n is not greater than the
present number of information channels on
the interface
The user can be identified by an ISDN number or a group of ISDN numbers, or globally
for all ISDN numbers on the interface.
More than one ISDN number can be associated with the interface only as part of a
supplementary service such as the multiple subscriber number supplementary service.
In the case of one ISDN number, the option given in table 1 for the number of calls can
only exceed the number of information channels in association with a supplementary
service (e.g. the call waiting supplementary service). As a service provider option,
separate values may be specified for incoming and for outgoing calls for either or both
of the limits.
The videotelephony teleservice shall be withdrawn by the service provider upon the request of the
subscriber, or for servi
...