ETSI ETS 300 082 ed.1 (1992-01)

Integrated Services Digital Network (ISDN); 3,1 kHz telephony teleservice; End-to-end compatibility

T/TE 12-05

Digitalno omrežje z integriranimi storitvami (ISDN) – Daljinska storitev telefonije na 3,1 kHz – Zahteve za združljivost telefonskih terminalov pri izvedbi konec-konec

General Information

• Status: Published
• Publication Date: 13-Feb-1992
• Technical Committee: TE 4 - Audiovisual and Voice Terminals
• Current Stage: 12 - Completion
• Due Date: 12-Jul-1991
• Completion Date: 14-Feb-1992
• Ref Project: SIST ETS 300 082 E1:2003 - Integrated Services Digital Network (ISDN);3,1 kHz telephony teleservice End-to-end compatibility requirements for telephony terminals

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 082 E1:2003
01-december-2003
Digitalno omrežje z integriranimi storitvami (ISDN) – Daljinska storitev telefonije na
3,1 kHz – Zahteve za združljivost telefonskih terminalov pri izvedbi konec-konec
Integrated Services Digital Network (ISDN);3,1 kHz telephony teleservice End-to-end
compatibility requirements for telephony terminals
Ta slovenski standard je istoveten z: ETS 300 082 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST ETS 300 082 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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

SIST ETS 300 082 E1:2003

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

SIST ETS 300 082 E1:2003
EUROPEAN ETS 300 082
TELECOMMUNICATION January 1992
STANDARD
Source: ETSI TC-TE Reference: T/TE 12-05
ICS: 33.080
ISDN, Terminals, Telephony
Key words:
Integrated Services Digital Network (ISDN);
3,1 kHz telephony teleservice
End-to-end compatibility requirements for telephony terminals
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 1992. All rights reserved.
New presentation - see History box

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

SIST ETS 300 082 E1:2003
Page 2
ETS 300 082: January 1992
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 300 082 E1:2003
Page 3
ETS 300 082: January 1992
Contents
Foreword.5
1 Scope .7
2 Normative references .7
3 Definitions, symbols and abbreviations .9
3.1 Definitions and symbols .9
3.2 Abbreviations.9
4 Access channel selection .10
5 D-channel characteristics .10
5.1 Outgoing calls.10
5.1.1 Coding of Bearer Capability (BC) information element.10
5.1.2 Coding of High Layer Compatibility (HLC) information element .10
5.1.3 Coding of Low Layer Compatibility (LLC) information element.11
5.2 Incoming call.12
5.2.1 Coding of Bearer Capability (BC) information element.12
5.2.2 Coding of High Layer Compatibility (HLC) information element .13
5.2.3 Coding of Low Layer Compatibility (LLC) information element.13
5.2.4 Operation of a designated terminal under restricted power conditions .13
5.2.5 Incoming call indication .13
5.2.5.1 Terminal is not engaged in a telephony call .13
5.2.5.2 Terminal is busy .14
5.3 Information tones .14
6 Transmission aspects .14
6.1 General.14
6.1.1 Encoding .14
6.1.2 Relative level.14
6.1.3 Volume control.14
6.2 Speech performance characteristics (handset 3,1 kHz telephony). 15
6.2.1 Sensitivity - frequency response .15
6.2.1.1 Sending .15
6.2.1.2 Receiving.15
6.2.2 Sending and Receiving Loudness Ratings (SLR and RLR) .15
6.2.2.1 Nominal values .15
6.2.2.2 Volume control .16
6.2.3 Sidetone.16
6.2.3.1 Talker sidetone.16
6.2.3.2 Listener sidetone.16
6.2.4 Terminal Coupling Loss (TCL) . 16
6.2.4.1 Weighted Terminal Coupling Loss (TCLw) .16
6.2.4.2 Stability loss.16
6.2.5 Distortion.17
6.2.5.1 Sending .17
6.2.5.2 Receiving .17
6.2.5.3 Sidetone .18
6.2.6 Variation of gain with input level.18
6.2.6.1 Sending .18
6.2.6.2 Receiving .18
6.2.7 Out-of-band signals.19
6.2.7.1 Discrimination against out-of-band input signals (sending) . 19

---------------------- Page: 5 ----------------------

SIST ETS 300 082 E1:2003
Page 4
ETS 300 082: January 1992
6.2.7.2 Spurious out-of-band (receiving).19
6.2.8 Noise.20
6.2.8.1 Sending.20
6.2.8.2 Receiving .20
6.2.8.3 Level of sampling frequency (receiving) .20
6.2.9 Acoustic shock.20
6.2.9.1 Continuous signal.20
6.2.9.2 Peak signal .20
6.2.10 Delay.20
6.2.11 Non-linear devices .20
7 Handset.21
8 Testing and approval methodology.21
Annex A (normative): Test specifications .22
A.1 General conditions for testing.22
A.1.1 Environment for tests.22
A.1.2 Power supply limitations.22
A.1.3 Test equipment interface.22
A.1.4 Test equipment requirements .22
A.1.4.1 Electroacoustic equipment.22
A.1.4.2 Test equipment for digital telephone sets.22
A.1.5 Alternative test methods .23
A.1.6 Accuracy of test measurements .24
A.2 Transmission requirements testing.24
A.2.1 Sensitivity/frequency response .24
A.2.1.1 Sending .24
A.2.1.2 Receiving.24
A.2.2 Loudness ratings.25
A.2.2.1 Sending loudness rating (SLR).25
A.2.2.2 Receiving Loudness Rating (RLR).25
A.2.3 Sidetone.25
A.2.3.1 Talker sidetone .25
A.2.3.2 Listener sidetone.26
A.2.4 Terminal Coupling Loss (TCL) .26
A.2.4.1 Weighted Terminal Coupling Loss (TCLw).26
A.2.4.2 Stability loss.26
A.2.5 Distortion.27
A.2.5.1 Sending .27
A.2.5.2 Receiving.28
A.2.5.3 Sidetone .28
A.2.6 Variation of gain with input level.28
A.2.6.1 Sending .28
A.2.6.2 Receiving.29
A.2.7 Out-of-band signals.29
A.2.7.1 Discrimination against out-of-band input signal .29
A.2.7.2 Spurious out-of-band signals .29
A.2.8 Noise.29
A.2.8.1 Sending .29
A.2.8.2 Receiving.29
A.2.8.3 Level of sampling frequency (receiving).29
A.2.9 Acoustic shock.30
A.2.9.1 Continuous signal.30
A.2.10 Delay .30
History .32

---------------------- Page: 6 ----------------------

SIST ETS 300 082 E1:2003
Page 5
ETS 300 082: January 1992
Foreword
This European Telecommunication Standard (ETS) has been produced by the Terminal Equipment (TE)
Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS is based on draft prETS 300 111 [5] concerning the stage one service description for the 3,1 kHz
telephony teleservice in the Integrated Services Digital Network (ISDN).

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

SIST ETS 300 082 E1:2003
Page 6
ETS 300 082: January 1992
Blank page

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

SIST ETS 300 082 E1:2003
Page 7
ETS 300 082: January 1992
1 Scope
This standard specifies those technical characteristics (logical and electroacoustic) that are necessary to
provide end-to-end compatibility of terminal equipment of the 3,1 kHz telephony teleservice which is
intended for connection to the ISDN basic rate interface at the coincident S/T or S reference point.
The requirements of this standard are in addition to those of standards for connection to the ISDN basic
rate interface.
The requirements of this standard describe the logical characteristics of the user-network signalling over
the D-channel relevant to this service.
The requirements of this standard provide real time two-way speech of a quality consistent with the CCITT
P. series Recommendations.
The requirements of this standard define only those characteristics relevant to normal handset telephony.
This standard is not applicable to:
a) hands-free or loudspeaking telephony;
b) cordless telephony;
c) telephony for disabled people (e.g. with amplification of received speech as an aid for the hard of
hearing);
d) telephony in hostile environments.
However, other standards that apply to such functions will ensure compatibility with handset telephony.
NOTE 1: The characteristics of the ISDN user-network interface are specified in final draft
prETS 300 012 [1], ETS 300 102-1 [3] and ETS 300 104 [4].
NOTE 2: Type approval requirements for terminals accessing this teleservice can be found in
ETS 300 085 [2], 300 105 [4] and draft prETS 300 153 [6].
2 Normative references
This ETS incorporates by dated or undated reference, provision 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 referenced to applies.
[1] Final draft prETS 300 012 (1991): "Integrated Services Digital Network (ISDN);
Basic user-network interface, Layer 1 specification and test principles".
[2] ETS 300 085 (1990): "Integrated Services Digital Network (ISDN); 3,1 kHz
telephony teleservice, attachment requirements for handset terminals (Candidate
NET 33)".
[3] ETS 300 102-1 (1991): "Integrated Services Digital Network (ISDN);
User-network interface layer 3, Specifications for basic call control".
[4] ETS 300 104 (1991): "Integrated Services Digital Network (ISDN); Attachment
requirements for terminal equipment to connect to an ISDN using ISDN basic
assess, Layer 3 aspects (Candidate NET 3 Part 2)".
[5] Draft prETS 300 111: "Integrated Services Digital Network (ISDN); Telephony
3,1 kHz teleservice; Service description (NA1(89)38)".

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

SIST ETS 300 082 E1:2003
Page 8
ETS 300 082: January 1992
[6] Draft prETS 300 153: "Integrated Services Digital Network (ISDN); Attachment
requirements for terminal equipment to connect to an Integrated Services Digital
Network (ISDN) using ISDN basic access (T/TE 04-08)".
[7] CCITT Recommendation G.101 (1988): "The transmission plan".
[8] CCITT Recommendation G.122 (1988): "Influence of national systems on
stability, talker echo, and listener echo in international connections".
[9] CCITT Recommendation G.223 (1988): "Assumptions for the calculation of noise
on hypothetical reference circuits for telephony".
[10] CCITT Recommendation G.701 (1988): "Vocabulary of digital transmission and
multiplexing, and Pulse Code Modulation (PCM) terms".
[11] CCITT Recommendation G.711 (1988): "Pulse Code Modulation (PCM) of voice
frequencies".
[12] CCITT Recommendation G.714 (1988): "Separate performance characteristics
for the send and receive sides of PCM channels applicable to 4-wire voice
frequency interfaces".
[13] CCITT Recommendation I.112 (1988): "Vocabulary of terms for ISDNs".
[14] CCITT Recommendation I.230 (1988): "Definition of bearer service categories".
[15] CCITT Recommendation I.240 (1988): "Definition of teleservices".
[16] CCITT Recommendation O.131 (1988): "Quantizing distortion measuring
equipment using a pseudo-random noise test signal".
[17] CCITT Recommendation O.132 (1988): "Quantizing distortion measuring
equipment using a sinusoidal test signal".
[18] CCITT Recommendation O.133 (1988): "Equipment for measuring the
performance of PCM encoders and decoders".
[19] CCITT Recommendation P.10 (1988): "Vocabulary of terms on telephone
transmission quality and telephone sets".
[20] CCITT Recommendation P.51 (1988): "Artificial ear and artificial mouth".
[21] CCITT Recommendation P.64 (1988): "Determination of sensitivity/frequency
characteristics of local telephone systems to permit calculation of their loudness
ratings".
[22] CCITT Recommendation P.76 (1988): "Determination of loudness ratings;
fundamental principles".
[23] CCITT Recommendation P.79 (1988): "Calculation of loudness ratings".
[24] CCITT Blue Book (1988), Volume V, Supplement 13: "Noise spectra".
[25] IEC 318: "An artificial ear, of the wide band type, for the calibration of
earphones used in audiometry".
[26] IEC 651: "Sound level meters".
[27] ISO 3 (1973): "Preferred numbers - series of preferred numbers".

---------------------- Page: 10 ----------------------

SIST ETS 300 082 E1:2003
Page 9
ETS 300 082: January 1992
3 Definitions, symbols and abbreviations
3.1 Definitions and symbols
For the purpose of this standard, the relevant definitions and symbols used in CCITT Recommendations
G.701 [10], I.112 [13], I.230 [14], I.240 [15] and P.10 [19] shall apply.
Acoustic reference level: the acoustic level which gives -10 dBm0 at the digital interface.
Designated terminal: refers to the terminal which is permitted to draw power from Power Source 1 under
restricted power conditions as specified in final draft prETS 300 012 [1].
Restricted power condition: the condition where the terminal has no other power source available than
Power Source 1 supplying the restricted power condition as specified in final draft prETS 300 012 [1].
3,1 kHz telephony teleservice: a definition for 3,1 kHz telephony service is to be found in draft prETS
300 111 [5].
Terminal Coupling Loss (TCL): the frequency dependent coupling loss between the receiving port and
the sending port of a terminal due to:
- acoustical coupling at the user interface;
- electrical coupling due to crosstalk in the handset cord or within the electrical circuits;
- seismic coupling through the mechanical parts of the terminal.
NOTE 1: The receiving port and the sending port of a digital voice terminal is a 0 dBr point.
NOTE 2: The coupling at the user interface depends on the conditions of use.
Weighted Terminal Coupling Loss (TCLw): the weighted Terminal Coupling Loss using the weighting of
CCITT Recommendation G.122 [8].
3.2 Abbreviations
Abbreviations used in CCITT Recommendations G.701 [10], I.112 [13], I.230 [14], I.240 [15] and P.10 [19]
shall apply.
The following abbreviations shall also apply:
ARL: Acoustic Reference Level
BC: Bearer Capability
ERP: Ear Reference Point
HLC: High Layer Compatibility
ISDN: Integrated Services Digital Network
LE: Artificial/real ear correction
LLC: Low Layer Compatibility
L ST: Sidetone Path Loss
me
LRGP: Loudness Rating Guard-ring Position

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

SIST ETS 300 082 E1:2003
Page 10
ETS 300 082: January 1992
LSTR: Listener Side Tone Rating
MRP: Mouth Reference Point
PCM: Pube Code Modulation
PSTN: Public Switched Telephone Network
TCL: Terminal Coupling Loss
TCLw: Weighted Terminal Coupling Loss
TE: Terminal Equipment
4 Access channel selection
The functional characteristics of the terminal shall be independent of the B-channel selected.
Compliance shall be tested by random choice of B-channel during testing.
5 D-channel characteristics
5.1 Outgoing calls
5.1.1 Coding of Bearer Capability (BC) information element
When initiating a call on the 3,1 kHz telephony teleservice in the ISDN, the coding of the BC information
element in the SETUP message shall be in conformance with figure 1.
Compliance shall be checked by using the test specified in ETS 300 104 [4], Annex A, section 3.
8  7  6  5  4  3  2  1
�˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜¿
‡  ‡    Bearer capability     ‡
    ‡ 0 ‡ 0  0  0  0  1  0  0 ‡ Octet 1
‡  ‡ information element identifier  ‡
ˆ˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
    ‡ 0  0  0  0  0  0  1  1 ‡ Octet 2
‡   Length of information element   ‡
ˆ˜˜˜˜´˜˜˜˜˜˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
    ‡ 1 ‡ 0  0 ‡ 0  0  0  0  0 ‡ Octet 3
‡  ‡ CCITT  ‡     Speech     ‡
ˆ˜˜˜˜¯˜˜˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡  ‡ Circuit ‡            ‡
    ‡ 1 ‡ 0  0 ‡ 1  0  0  0  0 ‡ Octet 4
‡ Ext‡  Mode ‡    64 kbit/s    ‡
ˆ˜˜˜˜¯˜˜˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
    ‡ 1 ‡ 0  1 ‡ 0  0  0  1  1 ‡ Octet 5
‡ Ext‡ Layer 1 ‡    G.711 A-law   ‡
�˜˜˜˜`˜˜˜˜˜˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜�
Figure 1: Coding of Bearer Capability (BC) information element-speech
5.1.2 Coding of High Layer Compatibility (HLC) information element
The use of the High Layer Compatibility (HLC) information element is optional. However, if used when
initiating a call on the 3,1 kHz telephony teleservice in the ISDN, the coding of the HLC information element
in the SETUP message shall be in conformance with figure 2.

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

SIST ETS 300 082 E1:2003
Page 11
ETS 300 082: January 1992
Compliance shall be checked by using the test specified in ETS 300 104 [4], Annex A, section 3.
 8  7  6  5  4  3  2  1
�˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜¿
‡  ‡  High layer compatibility   ‡
    ‡ 0 ‡ 1  1  1  1  1  0  1 ‡ Octet 1
‡  ‡ information element identifier  ‡
ˆ˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
    ‡ 0  0  0  0  0  0  1  0 ‡ Octet 2
‡   Length of information element   ‡
ˆ˜˜˜˜´˜˜˜˜˜˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜˜˜´˜˜˜˜˜˜˜˜˜·
‡  ‡     ‡       ‡ Protocol‡
    ‡ 1 ‡ 0  0 ‡ 1  0  0 ‡ 0   1 ‡ Octet 3
‡  ‡ CCITT ‡  First   ‡ Profile ‡
ˆ˜˜˜˜¯˜˜˜˜˜˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜`˜˜˜˜˜˜˜˜˜·
    ‡ 1 ‡ 0  0  0  0  0  0   1 ‡ Octet 4
‡  ‡      Telephony       ‡
�˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜�
Figure 2: Coding of High Layer Compatibility (HLC) information element
5.1.3 Coding of Low Layer Compatibility (LLC) information element
The use of Low Layer Compatibility (LLC) information elements is optional for the 3,1 kHz telephony
teleservice in the ISDN. If it is used, the coding of the LLC information element in the SETUP message
shall be as shown in either figure 3 or figure 4.
Compliance shall be checked by using the test specified in ETS 300 104 [4], Annex A, section 3.
8  7  6  5  4  3  2  1
�˜˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜¿
‡   ‡  Low layer compatibility    ‡
    ‡ 0 ‡ 1  1  1  1  1  0  0 ‡ Octet 1
‡   ‡ information element identifier  ‡
ˆ˜˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
    ‡ 0  0  0  0  0  0  1  0 ‡ Octet 2
‡   Length of information element   ‡
ˆ˜˜˜˜˜´˜˜˜˜˜˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡   ‡ Coding ‡ Information Transfer ‡
    ‡ 1 ‡ 0  0 ‡ 0  0  0  0  0 ‡ Octet 3
‡   ‡ Standard‡  Capability = Speech ‡
ˆ˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡   ‡ Transfer‡ Information Transfer ‡
    ‡ 1 ‡ 0  0 ‡ 1  0  0  0  0 ‡ Octet 4
‡   ‡ Mode=  ‡  Rate = 64 kbit/s  ‡
‡   ‡ Circuit ‡            ‡
�˜˜˜˜˜`˜˜˜˜˜˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜�
Figure 3: Coding of Low Layer Compatibility (LLC) information element indicating speech

---------------------- Page: 13 ----------------------

SIST ETS 300 082 E1:2003
Page 12
ETS 300 082: January 1992
8  7  6  5  4  3  2  1
�˜˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜¿
‡   ‡   Low layer compatibility   ‡
    ‡ 0 ‡ 1  1  1  1  1  0  0 ‡ Octet 1
‡   ‡ information element identifier  ‡
ˆ˜˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
    ‡ 0  0  0  0  0  0  1  1 ‡ Octet 2
‡   Length of information element   ‡
ˆ˜˜˜˜˜´˜˜˜˜˜˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡   ‡ Coding ‡ Information Transfer ‡
    ‡ 1 ‡ 0  0 ‡ 0  0  0  0  0 ‡ Octet 3
‡   ‡ Standard‡  Capability = Speech ‡
ˆ˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡   ‡ Transfer‡ Information Transfer ‡
    ‡ 1 ‡ 0  0 ‡ 1  0  0  0  0 ‡ Octet 4
‡   ‡ Mode=  ‡  Rate = 64 kbit/s  ‡
‡   ‡ Circuit ‡            ‡
ˆ˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡   ‡ Layer 1 ‡ User info layer 1 pro- ‡
    ‡ 1 ‡ 0  1 ‡ 0  0  0  1  1 ‡ Octet 5
‡   ‡ Identity‡ tocol = Rec.G.711 A-law‡
�˜˜˜˜˜`˜˜˜˜˜˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜�
Figure 4: Coding of Low Layer Compatibility (LLC) information element indicating speech,
CCITT Recommendation G.711 [11] A-law
5.2 Incoming call
5.2.1 Coding of Bearer Capability (BC) information element
An incoming call shall be considered as a call for the 3,1 kHz telephony teleservice if the BC information
element in the incoming SETUP message is encoded as described in figure 1.
A terminal for the 3,1 kHz telephony teleservice in the ISDN shall also accept an incoming call containing
the BC element 3,1 kHz audio accompanied by a progress indicator.
The BC information element for an incoming call originated in the Public Switched Telephone Network
(PSTN) shall indicate information transfer capability (octet 3, bit 1 - 5) 3,1 kHz audio as described in figure
5, and shall be accompanied by a progress indicator.
Compliance shall be checked by using the test specified in ETS 300 104 [4] Annex A, section 1.

---------------------- Page: 14 ----------------------

SIST ETS 300 082 E1:2003
Page 13
ETS 300 082: January 1992
8  7  6  5  4  3  2  1
�˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜¿
‡  ‡    Bearer capability     ‡
    ‡ 0 ‡ 0  0  0  0  1  0  0 ‡ Octet 1
‡  ‡ information element identifier  ‡
ˆ˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
    ‡ 0  0  0  0  0  0  1  1 ‡ Octet 2
‡   Length of information element   ‡
ˆ˜˜˜˜´˜˜˜˜˜˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
    ‡ 1 ‡ 0  0 ‡ 1  0  0  0  0 ‡ Octet 3
‡  ‡ CCITT  ‡   3.1 kHz audio   ‡
ˆ˜˜˜˜¯˜˜˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡  ‡ Circuit ‡            ‡
    ‡ 1 ‡ 0  0 ‡ 1  0  0  0  0 ‡ Octet 4
‡ Ext‡  Mode ‡    64 kbit/s    ‡
ˆ˜˜˜˜¯˜˜˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
    ‡ 1 ‡ 0  1 ‡ 0  0  0  1  1 ‡ Octet 5
‡ Ext‡ Layer 1 ‡  G.711 A-Law     ‡
�˜˜˜˜`˜˜˜˜˜˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜�
Figure 5: Coding of Bearer Capability (BC) information element 3,1 kHz audio
5.2.2 Coding of High Layer Compatibility (HLC) information element
If an HLC element is present in an incoming SETUP message, the HLC analysis shall be considered to be
successful for the 3,1 kHz telephony teleservice if the HLC information element is coded as described in
figure 2.
An incoming call shall be considered as a request for the 3,1 kHz telephony teleservice if the conditions of
subclause 5.2.1 are met, even though there is no HLC information element in the incoming SETUP
message.
Compliance shall be checked by using the test specified in ETS 300 104 [4], Annex A, section 1.
5.2.3 Coding of Low Layer Compatibility (LLC) information element
If an LLC element is present
...