SIST ETS 300 057:1997

SLOVENSKI STANDARD
SIST ETS 300 057:1997
01-maj-1997
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Integrated Services Digital Network (ISDN); Call Waiting (CW) supplementary service;
Functional capabilities and information flows
Ta slovenski standard je istoveten z: ETS 300 057 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST ETS 300 057:1997 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 057:1997

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SIST ETS 300 057:1997
EUROPEAN ETS 300 057
TELECOMMUNICATION May 1992
STANDARD
Source: ETSI TC-SPS Reference: T/S 22-02
ICS: 33.080
ISDN, supplementary services
Key words:
Integrated Services Digital Network (ISDN);
Call Waiting (CW) supplementary service
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 1992. 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.8
4 Symbols and abbreviations.8
5 Description .9
6 Derivation of the functional model .9
6.1 Functional model description .9
6.2 Description of the functional entities.9
6.3 Relationship with a basic service .9
7 Information flow .10
7.1 Information flow diagrams.10
7.2 Definition of individual information flows.11
7.2.1 Relationship ra.11
7.2.1.1 Contents of INFORM .11
7.2.2 Relationship rb.11
7.2.2.1 Contents of SETUP.11
7.2.2.2 Contents of CONNECTED.11
8 SDL diagrams for functional entities.11
8.1 CW supplementary service functions in FE1 .12
8.2 CW supplementary service functions in FE2 .14
8.3 CW supplementary service functions in FE3 .19
9 Functional entity actions (FEAs).21
9.1 FEAs of FE1.21
9.2 FEAs of FE2.21
9.3 FEAs of FE3.21
10 Allocation of functional entities to physical locations.22
History.23

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Foreword
This European Telecommunication Standard (ETS) has been produced by the Signalling Protocols &
Switching (SPS) 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 2 aspects (functional capabilities and information flows) needed to support the
Call Waiting (CW) supplementary service. The stage 1 and stage 3 aspects are detailed in ETS 300 056
(1991) and ETS 300 058 (1991), respectively.

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1 Scope
This standard defines the stage two of the Call Waiting (CW) supplementary service for the pan-European
Integrated Services Digital Network (ISDN) as provided by European public telecommunications operators.
Stage two identifies the functional capabilities and the information flows needed to support the stage 1
service description. The stage two description also identifies user operations not directly associated with a
call (see CCITT Recommendation I.130 [1]).
This standard is specified according to the methodology specified in CCITT Recommendation Q.65 [2].
This standard does not formally describe the relationship between this supplementary service and the
basic call but, where possible, the information is included for guidance.
In addition, this standard does not specify the requirements where the service is provided to the user via a
private ISDN. This standard 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 standard does not specify the additional requirements where the service is provided to the user via a
telecommunications network that is not an ISDN.
The CW supplementary service permits a user to be informed of an incoming call (as per basic call
procedures) with an indication that no interface information channel is available. The user then has the
choice of accepting, rejecting or ignoring the waiting call (as per basic call procedures).
The CW supplementary service is considered meaningful when applied to the telephony teleservice and the
speech and 3,1 kHz audio bearer services. Furthermore, it may also be applied to other circuit-switched
services.
This standard is applicable to the stage three standards for the ISDN CW supplementary service. The term
"stage three" is also defined in CCITT Recommendation I.130 [1]. 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 and stage three standards.
Furthermore, conformance to this standard 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 standard.
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.130 (1988): "Method for the characterisation of
telecommunication services supported by an ISDN and network capabilities of an
ISDN".
[2] CCITT Recommendation Q.65 (1988): "Stage 2 of the method for the
characterisation of services supported by an ISDN".
[3] ETS 300 056 (1991): "Integrated Services Digital Network (ISDN); Call Waiting
(CW) supplementary service; Service description".

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[4] CCITT Recommendation I.112 (1988): "Vocabulary of terms for ISDNs".
[5] ETS 300 140 (1992): "Integrated Services Digital Network (ISDN); Call Hold
(HOLD) supplementary service; Functional capabilities and information flows".
[6] CCITT Recommendation Q.71 (1988): "ISDN 64 kbit/s circuit mode switched
bearer services".
[7] CCITT Recommendation I.210 (1988): "Principles of telecommunications
services supported by an ISDN and the means used to describe them".
[8] CCITT Recommendation Z.100 (1988): "Functional Specification and Description
Language (SDL)".
3 Definitions
For the purposes of this standard, the following definitions apply:
Information channel control: a terminal that has information channel control is active on a call, is alerting
for an incoming call, has an outgoing call for which a channel has been selected, or has a call on hold with
reservation.
Integrated Services Digital Network (ISDN): see CCITT Recommendation I.112 [4], § 2.3, definition 308.
Service; telecommunications service: see CCITT Recommendation I.112 [4], § 2.2, definition 201.
Subscriber B: see ETS 300 056 [3], Clause 3.
Supplementary service: see CCITT Recommendation I.210 [7], § 2.4.
User A: see ETS 300 056 [3], Clause 3.
User B: see ETS 300 056 [3], Clause 3.
User C: see ETS 300 056 [3], Clause 3.
4 Symbols and abbreviations
CC Call Control
CCA Call Control Agent
CW Call Waiting
FEA Functional Entity Action
ISDN Integrated Services Digital Network
LE Local Exchange
PTNX Private Telecommunications Network Exchange
SDL Specification and Description Language

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