ETSI I-ETS 300 442 ed.1 (1995-12)

Integrated Services Digital Network (ISDN); Videotelephony teleservice; Terminal characteristics

DI/TE-04112

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

General Information

• Status: Published
• Publication Date: 18-Dec-1995
• Technical Committee: TE 4 - Audiovisual and Voice Terminals
• Current Stage: 12 - Completion
• Due Date: 08-Dec-1995
• Completion Date: 19-Dec-1995
• Ref Project: SIST I-ETS 300 442 E1:2003 - Integrated Services Digital Network (ISDN); Videotelephony teleservice; Terminal characteristics

Standards Content (Sample)

SLOVENSKI STANDARD
SIST I-ETS 300 442 E1:2003
01-december-2003
Digitalno omrežje z integriranimi storitvami (ISDN) – Daljinske storitve:
videotelefonija – Terminalske karakteristike
Integrated Services Digital Network (ISDN); Videotelephony teleservice; Terminal
characteristics
Ta slovenski standard je istoveten z: I-ETS 300 442 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST I-ETS 300 442 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST I-ETS 300 442 E1:2003

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SIST I-ETS 300 442 E1:2003
INTERIM
EUROPEAN I-ETS 300 442
TELECOMMUNICATION December 1995
STANDARD
Source: ETSI TC-TE Reference: DI/TE-04112
ICS: 33.080
ISDN, videotelephony teleservice, terminal characteristics
Key words:
Integrated Services Digital Network (ISDN);
Videotelephony teleservice;
Terminal characteristics
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 1995. All rights reserved.
New presentation - see History box

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I-ETS 300 442: December 1995
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 Abbreviations.9
5 Attachment requirements.10
6 System description.10
7 Terminal-network characteristics .10
7.1 Call control functions for the videotelephony teleservice.10
7.2 Call control functions for the telephony 3,1 kHz teleservice .10
7.3 Call control functions for the telephony 7 kHz teleservice .10
7.4 Support of supplementary services in the ISDN .10
7.4.1 General.10
7.4.2 Supplementary services, Multiple Subscriber Number/Subaddressing .10
7.4.2.1 Address checking .10
7.4.2.2 No selection information stored.11
7.4.2.3 Programming.11
7.4.3 Support of conference supplementary services .11
7.4.4 Call manipulating supplementary services.11
7.4.5 Call diversion supplementary services .11
7.4.6 Advice of Charge supplementary services (AOC-S, AOC-D, AOC-E).12
7.4.6.1 Protocols and procedures.12
7.4.6.2 Additional channel .12
7.4.7 Other supplementary services.12
7.5 Overlap and en-bloc sending.12
7.6 Information tones .12
7.6.1 Transmission of tones and announcement from the network .12
7.6.2 Generation of tones by the terminal .13
8 End-to-end characteristics .14
8.1 General .14
8.2 Inband signalling .14
8.3 Audio characteristics.14
8.3.1 Handset function .14
8.3.1.1 PCM coding .14
8.3.1.2 3,1 kHz bandwidth coding at 16 kbit/s .14
8.3.1.3 7 kHz bandwidth SB-ADPCM coding.15
8.3.2 Loudspeaking and handsfree functions .15
8.3.2.1 PCM coding .15
8.3.2.2 3,1 kHz bandwidth coding at 16 kbit/s .15
8.3.2.3 7 kHz bandwidth SB-ADPCM coding.15
8.4 Video characteristics.15
8.5 Dual Tone Multi Frequency (DTMF) signalling .15
8.5.1 General.15
8.5.2 Connection to the B-channel .15
8.5.3 Signalling frequencies .16
8.5.4 Frequency deviation .16
8.5.5 Level.16
8.5.6 Timing.16

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9 Power feeding. 16
9.1 General conditions . 16
9.2 Restricted Power Condition. 16
9.2.1 Leakage current. 17
9.2.2 Operation of the designated terminal under Restricted Power Conditions. 17
10 Physical modules. 17
10.1 Handset. 17
10.2 Audible alerting module. 17
10.2.1 Sound pressure level . 17
10.2.2 Alerting module control. 17
10.2.2.1 Starting. 17
10.2.2.2 Stopping. 17
10.2.3 Adjustment of sound characteristics. 18
10.2.4 Frequency spectrum. 18
10.3 Indication of requested teleservice. 18
10.3.1 Audible indication. 18
10.3.2 Visual indication. 18
11 Multipoint aspects. 19
11.1 Minimum configuration for multipoint application . 19
11.2 Optional functions. 19
12 Data communication. 19
Annex A (normative): Test specification . 20
A.1 General conditions for testing. 20
A.1.1 Environment for tests . 20
A.1.2 Power supply limitations. 20
A.1.3 Test equipment interface. 20
A.1.4 Alternative test methods. 20
A.1.5 Accuracy of test equipment. 20
A.2 Audible alerting module . 20
A.2.1 Sound pressure level measurement . 20
A.2.1.1 Measurement conditions. 20
A.2.1.2 Measurement method. 20
A.2.1.3 Frequency spectrum measurement. 21
A.3 DTMF measurements. 21
A.3.1 Frequency . 21
A.3.2 Signal level . 21
A.3.3 Signal timing. 21
Annex B (informative): Bibliography . 22
History. 23

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Foreword
This Interim European Telecommunication Standard (I-ETS) has been produced by the Terminal
Equipment (TE) Technical Committee of the European Telecommunications Standards Institute (ETSI).
An ETSI standard may be given I-ETS status either because it is regarded as a provisional solution ahead
of a more advanced standard, or because it is immature and requires a "trial period". The life of an I-ETS
is limited to three years after which it can be converted into an ETS, have it's life extended for a further
two years, be replaced by a new version, or be withdrawn.
Proposed announcement date
Date of adoption of this I-ETS: 17 November 1995
Date of latest announcement of this I-ETS (doa): 31 March 1996

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1 Scope
This I-ETS specifies the technical characteristics (electrical, functional, visual and acoustic) for
videotelephony terminals to be used at the basic access of the coincident S and T interface of the
Integrated Services Digital Network (ISDN). The characteristics of this I-ETS are meant to specify
characteristics that are outside the scope of attachment standards or specifications, and outside the
scope of standards specifying the end-to-end characteristics for videotelephony terminals. However, this I-
ETS is not intended to be used for type approval purposes or other mandatory requirements.
This I-ETS is applicable to videotelephony terminals as well as to the videotelephony functions of
multimedia or multiservice terminals.
This I-ETS is applicable to terminal equipment supporting the videotelephony teleservice in the ISDN as
defined in ETS 300 264 [1].
The characteristics specified in this I-ETS will cover a number of functions or facilities that can be
combined to form a particular terminal.
For multimedia or multiservice terminals, other requirements or standards may apply in addition to this
I-ETS.
The requirements of this I-ETS do not apply to videoconference terminals. Requirements to
videoconference terminals are specified in other standards.
2 Normative references
This I-ETS incorporates by dated and 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 I-ETS only when incorporated in it by amendment or revision. For undated references the
latest edition of the publication referred to applies.
[1] ETS 300 264 (1994): "Integrated Services Digital Network (ISDN);
Videotelephony teleservice, Service description".
[2] CCITT Recommendation G.701 (1988): "Vocabulary of digital transmission and
multiplexing, and pulse code modulation (PCM) terms".
[3] CCITT Recommendation I.112 (1988): "Vocabulary of terms for ISDNs".
[4] CCITT Recommendation I.230 (1988): "Definition of bearer service categories".
[5] CCITT Recommendation I.240 (1988): "Definition of teleservices".
[6] CCITT Recommendation P.10 (1988): "Vocabulary of terms on telephone
transmission quality and telephone sets".
[7] ETS 300 111 (1992): "Integrated Services Digital Network (ISDN); Telephony
3,1 kHz teleservice, Service description".
[8] ETS 300 263 (1994): "Integrated Services Digital Network (ISDN); Telephony
7 kHz teleservice, Service description".
[9] ETS 300 012 (1992): "Integrated Services Digital Network (ISDN); Basic
user-network interface, Layer 1 specification and test principles".
[10] ETS 300 145 (1994): "Integrated Services Digital Network (ISDN); Audiovisual
services, Videotelephone systems and terminal equipment operating on one or
two 64 kbit/s channels".
[11] ETS 300 102-1 (1990): "Integrated Services Digital Network (ISDN);
User-network interface layer 3, Specification for basic call control".

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[12] ETS 300 267-1 (1994): "Integrated Services Digital Network (ISDN); Telephony
7 kHz and videotelephony teleservices, Digital Subscriber Signalling System No.
one (DSS1) protocol, Part 1: Protocol specification".
[13] I-ETS 300 245-1: "Integrated Services Digital Network (ISDN); Technical
characteristics of telephony terminals, Part 1: General".
[14] CCITT Recommendation G.722 (1988): "7 kHz audio coding within 64 kbit/s".
[15] I-ETS 300 322 (1995): "Integrated Services Digital Network (ISDN); Digital
Subscriber Signalling System No. 1 (DSS 1); Abstract Test Suite (ATS)
specification for signalling network layer protocol for circuit-mode basic call
control (user)".
[16] CCITT Recommendation G.711 (1988): "Pulse code modulation (PCM) of voice
frequencies".
[17] ETS 300 182-1 (1993): "Integrated Services Digital Network (ISDN); Advice of
Charge (AOC) supplementary service, Digital Subscriber Signalling System No.
one (DSS1) protocol, Part 1: Protocol specification".
[18] I-ETS 300 245-7 (1995): "Integrated Services Digital Network (ISDN); Technical
characteristics of telephony terminals; Part 7: Locally generated information
tones".
[19] ETS 300 144 (1994): "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".
[20] ETS 300 143 (1994): "Integrated Services Digital Network (ISDN); Audiovisual
services, Inband signalling procedures for audiovisual terminals using digital
channels up to 2 048 kbit/s".
[21] I-ETS 300 302-1 (1994): "Integrated Services Digital Network (ISDN);
Videotelephony teleservice; Part 1: Electroacoustic characteristics for handset
telephony function when using Pulse Code Modulation (PCM) encoding".
[22] CCITT Recommendation G.728 (1992): "Coding of speech at 16 kbit/s using
low-delay code excited linear prediction".
[23] ITU-T Recommendation H.261 (1993): "Video codec for audiovisual services at
p x 64 kbit/s".
[24] ITU-T Recommendation T.122 (1993): "Multipoint communication service for
audiographics and audiovisual conferencing service definition".
[25] ITU-T Recommendation T.123 (1994): "Protocol stacks for audiographic and
audiovisual teleconference applications".
[26] ITU-T Recommendation T.125 (1994): "Multipoint communication service
protocol specification".
[27] IEC Publication 651: "Sound level meters".
[28] IEC Publication 225: "Octave, half-octave and third-octave band filters intended
for the analysis of sound and vibrations".
[29] ETS 300 085 (1990): "Integrated Services Digital Network (ISDN); 3,1 Hz
telephony teleservice, Attachment requirements for handset terminals
(Candidate NET 33)".

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3 Definitions
For the purposes of this I-ETS, the relevant definitions in CCITT Recommendations G.701 [2], I.112 [3],
I.230 [4], I.240 [5] and P.10 [6] apply along with the following:
handsfree terminal: A terminal using a loudspeaker associated with an amplifier as a telephony receiver
and which can be used without a handset. Defined in CCITT Recommendation P.10 [6].
loudspeaking terminal: A handset terminal using a loudspeaker associated with an amplifier as a
telephony receiver. Defined in CCITT Recommendation P.10 [6].
multimedia terminal: A terminal that simultaneously supports two or more media.
multiservice terminal: A terminal that supports two or more teleservices.
restricted power condition: See ETS 300 012 [9]. The condition is indicated by the reversed polarity of
the phantom voltage at the S or coincident S and T reference point.
NOTE 1: For some networks the restricted power condition may be the normal operating mode.
telephony 3,1 kHz teleservice: A description of the telephony 3,1 kHz teleservice is given in
ETS 300 111 [7], clause 5.
telephony 7 kHz teleservice: A description of the telephony 7 kHz teleservice is given in ETS 300 263
[8], clause 5.
videoconference terminal: A terminal that supports the videoconference teleservice.
NOTE 2: The videoconference teleservice is described in draft prETS 300 678 ("Integrated
Services Digital Network (ISDN); Videoconference teleservice, Service description").
videotelephony teleservice: A description of the videotelephony teleservice is given in ETS 300 264 [1],
clause 5.
4 Abbreviations
For the purposes of this I-ETS, the following abbreviations apply:
AOC-D Advice of Charge; charging information During the call
AOC-E Advice of Charge; charging information at the End of the call
AOC-S Advice of Charge; charging information at call Set-up time
CD Call Deflection
CFB Call Forwarding Busy
CFNR Call Forwarding No Reply
CFU Call Forwarding Unconditional
CH Call Hold
CONF Conference
CTR Common Technical Regulation
DTMF Dual Tone Multi Frequency
ECT Explicit Call Transfer
ISDN Integrated Services Digital Network
MLP Multi Layer Protocol
MMC Meet Me Conference
MSN Multiple Subscriber Number
SUB Subaddressing
TP Terminal Portability
3PTY Three Party
UDI-TA Unrestricted Digital Information with Tones and Announcement

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5 Attachment requirements
Attachment requirements are outside the scope of this I-ETS.
NOTE: Information about type approval requirements can be found in annex B to this I-ETS.
6 System description
A system description of a videotelephone terminal is given in ETS 300 145 [10]. All terminals shall be
capable of supporting the videotelephony teleservice as specified in ETS 300 264 [1] and the telephony
3,1 kHz teleservice as specified in ETS 300 111 [7].
Terminal types Xb2/3 and Xb5, as defined in ETS 300 145 [10], shall also be capable of supporting the
telephony 7 kHz teleservice as specified in ETS 300 263 [8].
Conformance shall be checked by verifying that the requirements of the relevant clauses in this I-ETS, or
the requirements of standards referred to, be met.
7 Terminal-network characteristics
7.1 Call control functions for the videotelephony teleservice
The call control functions at the user-network interface shall meet the relevant requirements of
ETS 300 102-1 [11] and ETS 300 267-1 [12].
Conformance shall be checked by using the tests specified in these ETSs.
NOTE: ETS 300 267-1 [12] specifies the layer 3 requirements for the videotelephony
teleservice as described in ETS 300 263 [8]. Additional characteristics as well as short
term solutions will be described in prI-ETS 300 654 ("Integrated Services Digital
Network (ISDN); Videotelephony terminals, Interim D-channel signalling aspects").
7.2 Call control functions for the telephony 3,1 kHz teleservice
The call control functions at the user-network interface shall meet the relevant requirements of
I-ETS 300 245-1 [13] and ETS 300 102-1 [11].
Conformance shall be checked by using the tests specified in this ETS and I-ETS.
7.3 Call control functions for the telephony 7 kHz teleservice
Where the speech coding option according to CCITT Recommendation G.722 [14] is implemented, the
call control functions at the user-network interface shall meet the relevant requirements of ETS 300 102-1
[11], ETS 300 267-1 [12] and I-ETS 300 245-1 [13].
Conformance shall be checked by using the tests specified in these ETSs and I-ETS.
7.4 Support of supplementary services in the ISDN
7.4.1 General
If two B-channels are required the ISDN supplementary services shall be invoked for each call. There are
other restrictions related to the videotelephony teleservice due to coding algorithms and the inband
signalling system.
7.4.2 Supplementary services, Multiple Subscriber Number/Subaddressing
7.4.2.1 Address checking
A terminal connected to an ISDN basic access can be selected by using the Multiple Subscriber Number
(MSN) and/or Subaddressing (SUB) supplementary services, if present.

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Only one ISDN number or subaddress shall be allocated to the videotelephony function of a terminal.
Where two B-channels are required, the same ISDN number or subaddress shall be used for both
connections (however, see note).
If the terminal, as an option, supports the MSN and/or SUB supplementary services and information for
selection is stored, a terminal connected to an ISDN basic access shall perform address checks on the
ISDN subscriber number and/or subaddress, if present in the incoming SETUP message. These checks
are additional to the compatibility checks referred to in subclauses 7.1 to 7.3.
Conformance shall be checked by using the relevant tests specified in I-ETS 300 322 [15].
NOTE: Regions outside Europe may allocate separate numbers to the two B-channels used.
For interworking with those regions and with non-ISDN video equipment on non-ISDN
networks, it may be necessary to use different destination numbers.
7.4.2.2 No selection information stored
When no information for selection is stored, the terminal shall respond to every incoming SETUP
message if the compatibility checks specified in subclauses 7.1 to 7.3 are successful.
Conformance shall be checked by using the relevant tests specified in I-ETS 300 322 [15].
7.4.2.3 Programming
Off-line programming and erasing of information for selection (MSN and/or SUB) shall be available to the
human user.
Conformance shall be checked by inspection.
7.4.3 Support of conference supplementary services
The conference supplementary services offered by the ISDN (Meet-Me Conference (MMC), Conference
call, Add-on (CONF) or Three party (3 PTY)) may be invoked only when the terminal is operating in mode
0U and uses A-law speech coding according to CCITT Recommendation G.711 [16].
Before one of these supplementary services is invoked, the terminal shall switch to mode a0U.
Conformance shall be checked by verifying that the relevant supplementary services only can be invoked
when the terminal is working in mode a0U.
NOTE 1: The remote videotelephone terminal cannot be forced to transmit unframed, only to
receive unframed. Unless that terminal is switched to mode a0U by user action, the
speech quality will be reduced.
NOTE 2: If the remote terminal has indicated that it supports CCITT Recommendation G.711
[16] μ-law only, the invocation of these supplementary services should be prevented.
7.4.4 Call manipulating supplementary services
When invoking the call manipulating supplementary services (Call Hold (CH), Explicit Call Transfer (ECT)
or Terminal Portability (TP)), an interaction between inband signalling and D-channel signalling is needed.
The principles specified in ETS 300 145 [10] shall be used.
Before the invocation of these supplementary services, a mode a0U communication shall be established.
7.4.5 Call diversion supplementary services
Terminals that support these supplementary services (Call Forwarding Unconditional (CFU), Call
Forwarding Busy (CFB), Call Forwarding No Reply (CFNR), and Call Deflection (CD)) shall have the
capability of compatibility checking of both octet 4 and octet 4a of the HLC information element as
described in ETS 300 267-1 [12].

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For an incoming SETUP message where an initial channel is indicated, in octet 4a of the HLC information
element, or where there is no indication of the status of the channel, the normal procedures for these
supplementary services shall apply.
Where the incoming SETUP message is indicating an additional channel in octet 4a, and the terminal has
not established an initial channel, the terminal shall reject the call.
If it is not known that the call request is for an additional channel, the call shall be accepted.
Conformance shall be checked by inspection.
NOTE: The refinement of the D-channel and inband procedures is for further study.
7.4.6 Advice of Charge supplementary services (AOC-S, AOC-D, AOC-E)
7.4.6.1 Protocols and procedures
The protocols and procedures for the Advice of Charge supplementary services are specified in
ETS 300 182-1 [17].
Conformance shall be checked by using the tests specified for the relevant supplementary services.
7.4.6.2 Additional channel
The Advice of Charge supplementary services provide charging information on a per call basis. Where
these supplementary services are invoked, and an additional channel is established, the terminal shall
also invoke the supplementary service for this call.
Conformance shall be checked by inspection.
7.4.7 Other supplementary services
If supplementary services not identified in the subclauses above are applied, they shall be invoked for
each of the two calls where appropriate.
Conformance shall be checked by using the tests s
...