SIST ETS 300 834 E1:2003

• Abstract:

  This ETS will define the protocol elements for interactive audiovisual retrieval services on narrowband networks without data-facility: Access for ISDN or PSTN videophony terminals to audiovisual databases using Dual Tone Multi Frequency (DTMF). The protocol stack on PSTN access shall be based on ITU-T Recs H.324 and H.245. The protocol stack on ISDN shall be based on ETS 300 144 and ETS 300 145. Details of the protocl stack are given in the documents listed in the Reference documents list. New work item supported by Austrian PTT, France Telecom, KPN, TeleDenmark

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.040.35 - Telephone networks
• ICS: 33.080 - Integrated Services Digital Network (ISDN)
• ICS: 35.180 - IT Terminal and other peripheral equipment
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI ETS 300 834 ed.1 (1998-04) - Terminal Equipment (TE); Narrowband networks (PSTN or ISDN); Access to interactive audio-visual retrieval services without datafacility; Access for ISDN or PSTN videophony terminals to audio-visual databases

SIST ETS 300 834 E1:2003 is the Slovenian adoption of ETS 300 834 Edition 1 from ETSI, a European Telecommunication Standard for narrowband PSTN or ISDN terminal equipment. It specifies how ISDN or PSTN videophony terminals without data-facility can access interactive audio-visual retrieval services and audio-visual databases. The document focuses on the communication modes and interactive protocols used to control retrieval, including DTMF, SBE messages and UII messages.

What does SIST ETS 300 834 E1:2003 specify?

SIST ETS 300 834 E1:2003 specifies access from narrowband ISDN or PSTN videophony terminals without data-facility to interactive audio-visual retrieval services. In practice, it defines how the terminal and the audio-visual database communicate, which interactive protocol they use, and which audio and video modes they support.

The document is organized into clauses for scope, normative references, definitions and abbreviations, then separate technical clauses for ISDN access and PSTN access.

Annex	What it covers
Annex A	Informative bibliography

Clause 4 covers ISDN access using DTMF or SBE messages. Clause 5 covers PSTN access using UII messages. The scope also states that the standard uses videophony to cover both videotelephony and videoconferencing applications.

What are the key requirements of SIST ETS 300 834 E1:2003?

The main requirements are the communication modes, the interactive protocols, and the way the terminal and database agree on a common mode. For a buyer or engineer, the practical question is whether a device supports the required codec and signalling combination for the target network.

ISDN access and communication modes

For ISDN access, SIST ETS 300 834 E1:2003 requires both the terminal and the ISDN audio-visual database to conform to the ISDN audiovisual methods referenced in the standard. The call set-up procedures from the related ISDN audiovisual standards are also used for database access.

The basic communication mode is mandatory. It uses 2 B-channels, G.711 A-law audio at 56 kbit/s, and ETS 300 142 video in QCIF at 7.5 frames per second. This is the minimum mode that guarantees interoperability.

The preferred communication mode uses the same 2 B-channels and G.711 A-law audio, but with ETS 300 142 video in CIF at 7.5 frames per second. This is the mode to aim for when the terminal and database both support it, because it gives better video quality while staying broadly interoperable.

Other ISDN modes allow different channel counts, audio codecs and video formats. The standard names 1, 2 or 6 B-channel options, audio based on G.711, G.722, G.728 or G.723.1, and video based on ETS 300 142 or H.263. In practice, this means implementers can offer more than one service profile, but they still need the basic mode to connect reliably.

ISDN terminal and database obligations

An ISDN videophony terminal shall support the basic communication mode. Other ISDN modes are optional for the terminal. An ISDN audio-visual database shall support the basic mode and the preferred mode, plus certain additional 1-B-channel and 6-B-channel combinations.

The database also has to choose the best common mode with the terminal. If the preferred mode is common, the database shall use it. If several modes are possible, the choice is based on service criteria such as audio quality, video quality or bandwidth use. This matters because the database may need multiple stored versions of the same material, or online re-encoding.

ISDN interactive protocols

For ISDN control of retrieval, the standard specifies two interactive protocols: DTMF and SBE. DTMF is the minimum requirement for ISDN videophony terminals, while the database shall support both DTMF and SBE. If a terminal can send both, SBE shall be used.

DTMF supports the characters 0-9, * and # as the required user input set. That is enough for menu-driven services where the user selects options by keypad. SBE messages can carry alphanumeric input and, for PC/WS-based terminals, pointer selection events in the video presentation area.

The PointingDeviceEventStatus message is the special SBE form used for pointer-based selection. It carries the pointer position and the button event, so a service can map clicks in the video area to interactive actions.

PSTN access and communication modes

For PSTN access, SIST ETS 300 834 E1:2003 uses UII messages in the control channel as the interactive protocol. The PSTN terminal and database conform to the PSTN videophony methods referenced by the standard.

The basic communication mode for PSTN uses V.34 and V.8 on the PSTN side, G.723.1 audio at 5.3 kbit/s, and H.263 video in QCIF. The preferred communication mode keeps the same PSTN and audio choices but uses H.263 in CIF. As with ISDN, the basic mode is mandatory for the terminal, while the database supports the basic and preferred modes at minimum.

PSTN UII carries keypad input characters 0-9, * and #, and can also carry pointing-device events for PC/WS-based terminals. The standard gives the message format and the fields for video-channel number and button event identifier, so implementations can exchange the same user action in a consistent way.

What terms does SIST ETS 300 834 E1:2003 define?

• Audio-visual retrieval service - An interactive service where the user receives stored audio-visual information on demand, rather than by store-and-forward delivery.
• Interactive protocol - The procedure used between terminal and service centre to manage the user interaction during retrieval.
• Service centre - The computer system that authorizes access to the service and may also handle user assistance, billing and statistics.
• ISDN audio-visual database - A database that stores audio-visual information in the ISDN coding and framing environment used by the standard.
• PSTN videophony terminal - A videophony terminal designed for the PSTN access method described in the standard.
• Dual Tone Multi Frequency (DTMF) - The tone-based keypad signalling used to send user input characters over the audio stream.
• Single Byte Extension (SBE) - An ISDN control and indication message method used to carry alphanumeric input and pointing-device events.
• UserInputIndication (UII) - The H.245 control-channel message used on PSTN access to transport user input characters.

Who uses SIST ETS 300 834 E1:2003?

SIST ETS 300 834 E1:2003 is used by terminal manufacturers, audiovisual service providers, database operators and network engineers working with narrowband ISDN or PSTN videophony. It is also relevant to integrators of PC/WS-based terminals, because the document defines pointer-selection support for those systems.

Quality managers and test laboratories use it to check interoperability between terminals and databases, especially for the mandatory basic mode and the required interactive protocol. Buyers can use it to compare products against a specific access method: ISDN with DTMF or SBE, or PSTN with UII.

Which standards are used with reference in SIST ETS 300 834 E1:2003?

Reference	What it contributes
ETS 300 145	ISDN audiovisual videotelephone methods; basis for the ISDN terminal and database behaviour
ETS 300 144	ISDN frame structure and inband signalling; source of SBE messages
ETS 300 142	Video coding used for the ISDN communication modes
I-ETS 300 837 / ITU-T H.324	PSTN low bitrate multimedia terminal methods; basis for PSTN access
ITU-T H.245	Control protocol for multimedia communication; source of UII transport and channel concepts
CCITT Q.23	DTMF signalling frequencies and reception
ITU-T H.223 and H.230	Low-bitrate multiplexing and control signalling used with SBE handling
G.711, G.722, G.728, G.723.1, H.261, H.263, V.34, V.8	Audio codecs, video codecs and modem/protocol elements used in the named communication modes

These references tell an implementer which codec, framing, modem or control mechanism to use on each network. They also show that the standard is built on established ISDN and PSTN audiovisual transport methods rather than defining everything from scratch.

What does the SIST ETS 300 834 E1:2003 document contain?

The document contains the scope, normative references, definitions and abbreviations, then detailed technical clauses for ISDN and PSTN access. Clause 4 and clause 5 each describe basic, preferred and other communication modes, plus the rules for how a terminal and database establish a common mode.

It also includes the message formats for DTMF, SBE and UII-based user interaction. For pointer-based services, the document provides a positioning system for the video presentation area and a table of pointing-device button event identifiers.

Annex A gives an informative bibliography with related ETSI work on retrieval services and priority setting.

SLOVENSKI STANDARD
01-december-2003
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Terminal Equipment (TE); Narrowband networks (PSTN or ISDN); Access to interactive
audio-visual retrieval services without datafacility; Access for ISDN or PSTN videophony
terminals to audio-visual databases
Ta slovenski standard je istoveten z: ETS 300 834 Edition 1
ICS:
33.040.35 Telefonska omrežja Telephone networks
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
35.180 Terminalska in druga IT Terminal and other
periferna oprema IT peripheral equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 834
TELECOMMUNICATION April 1998
STANDARD
Source: MTA Reference: DE/MTA-001071
ICS: 33.020
Key words: AVI, multimedia, retrieval, terminal
Terminal Equipment (TE);
Narrowband networks (PSTN or ISDN);
Access to interactive audio-visual
retrieval services without datafacility;
Access for ISDN or PSTN videophony
terminals to audio-visual databases
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
Internet: [e-mail] - http://www.etsi.fr - http://www.etsi.org
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 1998. All rights reserved.

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ETS 300 834: April 1998
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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ETS 300 834: April 1998
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .9
3.1 Definitions .9
3.2 Abbreviations .10
4 Access for ISDN videophony terminals without data-facility to audio-visual retrieval services
using DTMF or SBE messages.10
4.1 Description.10
4.2 ISDN videophony .10
4.2.1 Basic communication mode .11
4.2.2 Preferred communication mode.11
4.2.3 Other communication modes .11
4.2.4 ISDN videophony terminal communication mode requirements .12
4.2.5 ISDN audio-visual database communication mode requirements .12
4.2.6 Establishment of common communication modes .12
4.3 ISDN Interactive protocols .12
4.3.1 DTMF as an ISDN interactive protocol.12
4.3.2 SBE messages as an ISDN interactive protocol: .13
4.3.3 Support of ISDN interactive protocols .15
5 Access for PSTN videophony terminals without-data facility to audio-visual retrieval services
using UserInputIndication (UII) messages .15
5.1 Description.15
5.2 PSTN videophony .16
5.2.1 Basic communication mode .16
5.2.2 Preferred communication mode.16
5.2.3 Other communication modes .17
5.2.4 PSTN videophony terminal communication mode requirements .17
5.2.5 PSTN audio-visual database communication mode requirements .17
5.2.6 Establishment of common communication modes .17
5.3 PSTN Interactive protocol: UserInputIndication (UII).17
Annex A (informative): Bibliography.19
History.20

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ETS 300 834: April 1998
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ETS 300 834: April 1998
Foreword
This European Telecommunication Standard (ETS) has been produced by the Terminal Equipment (TE)
Technical Committee of the European Telecommunications Standards Institute (ETSI).
Transposition dates
Date of adoption of this ETS: 20 March 1998
Date of latest announcement of this ETS (doa): 31 July 1998
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 January 1999
Date of withdrawal of any conflicting National Standard (dow): 31 January 1999

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ETS 300 834: April 1998
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ETS 300 834: April 1998
1 Scope
This European Telecommunication Standard (ETS) specifies how narrowband (Integrated Services Digital
Network (ISDN) or Public Switched Telephony Network (PSTN)) videophony terminals without data-facility
can access interactive audio-visual retrieval services. To control the retrieval process, the terminal should
support some interactive protocol between the end user and the service centre. For ISDN videophony
terminals, the solutions using inband signalling via Dual Tone Multi Frequency (DTMF), CCITT
Recommendation Q.23 [1] in the audio stream and the use of transmitting Single Byte Extension (SBE)
control and indication messages (ETS 300 144 [5]) are specified in this ETS. In the case of the PSTN, use
of transmitting UserInputIndication (UII) via ITU-T Recommendation H.245 [23] messages in the control
channel is specified. In I-ETS 300 837 [4], this user input is not considered as data capability.
The use of DTMF, SBE and UII enables a user to control the retrieval process via input of alphanumeric
characters from a keypad or keyboard, equivalent to the DTMF signals used in analogue telephony. This
may be used to manually operate remote equipment such as voice mail or video mail systems, menu-
driven information services etc. DTMF, SBE and UII support at least, the transmission of user input
characters '0-9', ‘*’, and ‘#’. Transmission of other characters is optional. The use of DTMF, SBE or UII as
interactive protocols is very simple, since the service centre can instruct the user, either in text or spoken,
in the same way as in voice response systems.
For Personal Computer (PC) / Work station (WS) based ISDN and PSTN videophony terminals, an
additional selection mechanism that permits pointing device selections via (push) buttons in the video
presentation area using SBE or UII messages is specified.
This ETS is applicable to audio-visual services based on retrieval of information, coded according to
ETS 300 145 [2] (in the ISDN case) or I-ETS 300 837 [4] (in the PSTN case). In this ETS the definition
"videophony" is used to address both videotelephony and videoconferencing applications.
The audio-visual retrieval services will be hosted on an audio-visual service centre. In this ETS only the
audio-visual database functionality of the service centre will be specified.
NOTE: Information retrieval using videophony terminals in combination with DTMF or SBE/UII,
are only two of the possible scenarios for the access of retrieval services and audio-
visual services on narrowband networks. In ETR 176 and ETR 272 (see annex A)
other scenarios have been described.
2 Normative references
This ETS incorporates by dated or undated reference, provisions from other publications. These
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 application referred to applies.
[1] CCITT Recommendation Q.23 (1990): "Signalling frequencies for push-button
telephone sETS and reception of those signals in exchanges".
[2] ETS 300 145 (1996): "Integrated Services Digital Network (ISDN); Audiovisual
services Videotelephone systems and terminal equipment operating on one or
two 64 kbit/s channels".
NOTE 1: ETS 300 145 is the ETSI equivalent to ITU-T Recommendation H.320 [3]. The scope
of ETS 300 145 is restricted to 1B and 2B ISDN videophones.
[3] ITU-T Recommendation H.320 (1993): "Narrow-band visual telephone systems
and terminal equipment".
[4] prI-ETS 300 837: "Public Switched Telephone Network (PSTN); Terminals for
low bitrate Multimedia communication".
NOTE 2: prI-ETS 300 837 is the ETSI equivalent to ITU-T Recommendattion H.324 [18].

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ETS 300 834: April 1998
[5] ETS 300 144 (1996): "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".
NOTE 3: ETS 300 144 is the ETSI equivalent to ITU-T Recommendations H.221 [6] and
H.242 [12].
[6] ITU-T Recommendation H.221 (1995): "Frame structure for a 64 to 1 920 kbit/s
channel in audiovisual services".
[7] ITU-T Recommendation H.230 (1995): "Frame-synchronous control and
indication signals for audiovisual systems".
[8] ITU-T Recommendation H.223 (1996): "Multiplexing protocol for low-bitrate
multimedia communication".
[9] CCITT Recommendation B.13 (Blue Book Fasc. I.3 1991): I.3: "Terms and
definitions".
[10] ITU-T Recommendation F.300 (1994): "Videotex service".
[11] ETS 300 143 (1994) and A1: "Integrated Services Digital Network (ISDN);
Audiovisual services; Inband signalling procedures for audiovisual terminals
using digital channels up to 2 048 kbit/s".
NOTE 4: ETS 300 143 is the ETSI equivalent to ITU-T Recommendation H.242 [12].
[12] ITU-T Recommendation H.242 (1993): "System for establishing communication
between audiovisual terminals using digital channels up to 2 Mbit/s".
[13] ETS 300 142 (1995): "Integrated Services Digital Network (ISDN) and other
digital telecommunications networks; Line transmission of non-telephone
signals; Video codec for audio visual services at p · 64 kbits
[ITU-T Recommendation H.261 (1993), modified]".
NOTE 5: ETS 300 142 is the ETSI equivalent to ITU-T Recommendation H.261 [14].
[14] ITU-T Recommendation H.261 (1993): "Video codec for audiovisual services at
p · 64 kbps".
[15] CCITT Recommendation G.711 (1990): "Pulse code modulation (PCM) of voice
frequencies".
[16] CCITT Recommendation G.722 (1990): "7 kHz audio-coding within 64 kbit/s".
[17] CCITT Recommendation G.728 (1992): "Coding of speech at 16 kbit/s using
low-delay code excited linear prediction".
[18] ITU-T Recommendation H.324 (1996): "Terminal for low bitrate multimedia
communication".
[19] I-ETS 300 380 (1995): "Universal Personal Telecommunications (UPT); Access
devices Dual Tone Multi Frequency (DTMF) sender for acoustic coupling to the
microphone of a handset telephone".
[20] ITU-T Recommendation V.34 (1994): "A modem operating at data signalling
rates of up to 28 800 bit/s for use on the GSTN and on leased point-to-point
2-wire telephone-type circuits".
[21] ITU-T Recommendation G.723.1 (1996): "Dual rate speech coder for multimedia
communication transmitting at 5,3 and 6,3 kbit/s".

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ETS 300 834: April 1998
[22] ITU-T Recommendation H.263 (1996): "Videocoding for low bit rate
communication".
[23] ITU-T Recommendation H.245 (1996): "Control protocol for multimedia
communication".
[24] ITU-T Recommendation V.8 (1994): "Procedures for starting sessions of data
transmission over the GSTN".
[25] ITU-T Recommendation V.8bis (1996): "Procedures for the identification and
selection of common modes of operation between data circuit terminating
equipment (DCE) and between data terminal equipment (DTE) over the general
switched telephone network and on leased point-to-point telephone-type
circuits".
[26] ITU-T Recommendation V.25ter (1995): "Serial asynchronous automatic dialling
and control".
[27] CCITT Recommendation T.61: "International Alphabet No. 5".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definitions apply:
audio-visual retrieval service: An interactive service which provides uni-directional communication by
means of real-time (no store-and-forward) end-to-end audio-visual information transfer from an audio-
visual database to the user (see also retrieval service).
ISDN audio-visual database: An information database that contains audio-visual information coded
according to ETS 300 145 [2]. In the scope of this ETS it implies that the database is least capable of
sending audio and video in a framed structure (ETS 300 144 [5]).
ISDN videophony terminal: A videophony terminal equipment that conforms to the methods described in
ETS 300 145 [2]. In the scope of this ETS it implies that the terminal is at least capable of receiving audio
and video sent in a framed structure (ETS 300 144 [5]). The terminal also may support data capabilities.
interactive protocol: A formal statement of the procedures that are adopted to ensure interactive
communication between a terminal and a service centre within the application layer function (definition
derived from protocol definition in ITU-T Recommendation F.300 [10]).
PSTN audio-visual database: An information database that contains audio-visual information coded
according to I-ETS 300 837 [4]. In the scope of this ETS it implies that the database is least capable of
sending audio and video in packet mode structure (ITU-T Recommendation H.223 [8]).
PSTN videophony terminal: A videophony terminal equipment that conforms to the methods described
in I-ETS 300 837 [4]. In the scope of this ETS it implies that the terminal is at least capable of receiving
audio and video send in packed mode (ITU-T Recommendation H.223 [8]). The terminal also may support
data capabilities.
retrieval service: An interactive service which provides the capability of accessing information stored in
databases. The information will be sent to the user on demand only. The information can be retrieved on
an individual basis, i.e., the time at which an information sequence is to start is under the control of the
user (CCITT Recommendation B.13 [9]).
service centre: A computer system used by a service provider to authorize access to a service. Other
functions of the service centre may include assistance to users in selecting the particular application
required (either provided by the service centre or by other host computers), as well as management
facilities such as billing, statistics gathering, etc. The same computer may also be a host computer and/or
provide a gateway function (definition derived from ITU-T Recommendation F.300 [10]).

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ETS 300 834: April 1998
videophony: Videotelephony and/or videoconferencing are addressed in this definition.
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
BAS Bit-rate Allocation Signal
CIF Common Intermediate Format
DCE Data Circuit terminating Equipment
DTE Data Terminal Equipment
DTMF Dual Tone Multi Frequency
GSTN General Switched Telephone Network
ISDN Integrated Services Digital Network
PC Personal Computer
PSTN Public Switched Telephone Network
QCIF Quarter Common Intermediate Format
SQCIF Sub-QCIF
SBE Single Byte Extension
T Terminal
UII UserInputIndication
WS Work Station
4 Access for ISDN videophony terminals without data-facility to audio-visual
retrieval services using DTMF or SBE messages
4.1 Description
This subclause specifies how ISDN videophony terminals without data-facility can access interactive
audio-visual retrieval services. Both using inband signalling via DTMF CCITT Recommendation Q.23 [1] in
the audio stream and the use of transmitting SBE control and indication signalling messages
(ETS 300 144 [5]) are specified as interactive protocols.
Audio (DTMF)  Video
Control & indication signalling: SBE messages
DB
T
ISDN
ISDN videophony terminal ISDN audio-visual database
Figure 1: ISDN videophony terminal with access to an ISDN audio-visual database, using DTMF or
SBE as interactive protocols
4.2 ISDN videophony
Both ISDN videophony terminal equipment and the ISDN audio-visual database need to conform to the
methods described in ETS 300 145 [2], but do not necessarily need to offer data capabilities. In the scope
of this ETS it implies that the terminal is at least capable of receiving audio and video sent in a framed
structure (ETS 300 144 [5]). Also that the database is at least capable of sending audio and video in a
framed structure (ETS 300 144 [5]).
The call set-up procedures described in ETS 300 143 [11] and ETS 300 145 [2] for call set-up between
terminals is also used for call set-up between a terminal and an audio-visual database. In general, the
terminal will be the call initiator, although an audio-visual database might set-up a call.
A problem area is the number of combinations that are possible for dividing the bandwidth between video
and audio, and the number of options for encoding the audio-visual information. Combination of the above
options leads to a large number of communication modes. ISDN videophony terminals support different
modes and not all modes are common between all vendors (or terminal types).

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ETS 300 834: April 1998
Therefore, in this ETS one basic communication mode is specified to guarantee interoperability. This
communication mode is mandatory for both the terminal and the database. Furthermore, one preferred
communication mode is specified. The preferred communication mode gives an optimal balance between
interoperability (most common communication mode) and service quality (optimal video quality). It is an
optional capability for the terminal and mandatory capability for the database
...