SIST EN 300 058-1 V1.2.4:2005

SLOVENSKI STANDARD
01-april-2005
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Integrated Services Digital Network (ISDN); Call Waiting (CW) supplementary service;
Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol
specification
Ta slovenski standard je istoveten z: EN 300 058-1 Version 1.2.4
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 300 058-1 V1.2.4 (1998-06)
European Standard (Telecommunications series)
Integrated Services Digital Network (ISDN);
Call Waiting (CW) supplementary service;
Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification

2 EN 300 058-1 V1.2.4 (1998-06)
Reference
REN/SPS-05145-F-1 (0jc90iqo.PDF)
Keywords
ISDN, CW, DSS1, supplementary service
ETSI
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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.
ETSI
3 EN 300 058-1 V1.2.4 (1998-06)
Contents
Intellectual Property Rights. 4
Foreword. 4
1 Scope . 6
2 Normative references. 6
3 Definitions. 7
4 Abbreviations.7
5 Description . 8
6 Operational requirements . 8
6.1 Provision and withdrawal.8
6.2 Requirements on the originating network side.8
6.3 Requirements on the destination network side .8
7 Coding requirements. 8
8 State definitions. 8
9 Signalling procedures at the coincident S and T reference point . 9
9.1 Activation .9
9.2 Deactivation.9
9.3 Registration.9
9.4 Call offering.9
9.4.1 Normal operation .9
9.4.2 Exceptional procedures.9
9.5 Call confirmation .9
9.5.1 Normal operation .9
9.5.1.1 Network determined user busy .9
9.5.1.2 Subscriber resources in use.10
9.5.2 Exceptional procedures.10
9.6 Call waiting acceptance.10
9.6.1 Normal operation .10
9.6.2 Exceptional procedures.11
10 Procedures for interworking with private ISDNs . 11
10.1 Served user is on a private ISDN.11
10.2 Calling user is on a private ISDN .11
11 Interaction with other networks . 11
12 Interaction with other supplementary services. 12
13 Parameter values . 12
14 Dynamic description (SDL diagrams). 12
Annex A (Informative): Signalling flows . 13
Annex B (informative): Changes with respect to the previous ETS 300 058-1. 16
History. 17
ETSI
4 EN 300 058-1 V1.2.4 (1998-06)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in
SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect
of ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on the
ETSI Web server (http://www.etsi.fr/ipr or http://www.etsi.org/ipr).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can
be given as to the existence of other IPRs not referenced in SR 000 314 (or the updates on the ETSI Web server) which
are, or may be, or may become, essential to the present document.
Foreword
This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Signalling
Protocols and Switching (SPS).
The present document is part 1 of a multi-part standard covering the Digital Subscriber Signalling System No. one (DSS1)
protocol specification for the Integrated Services Digital Network (ISDN) Call Waiting (CW) supplementary service, as
described below:
Part 1: "Protocol specification";
Part 2: "Protocol Implementation Conformance Statement (PICS) proforma specification";
Part 3: "Test Suite Structure and Test Purposes (TSS&TP) specification for the user";
Part 4: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT)
proforma specification for the user";
Part 5: "Test Suite Structure and Test Purposes (TSS&TP) specification for the network";
Part 6: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT)
proforma specification for the network".
In accordance with CCITT Recommendation I.130, 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.
The present document details the stage 3 aspects (signalling system protocols and switching functions) needed to support
the Call Waiting (CW) supplementary service. The stage 1 and stage 2 aspects are detailed in ETS 300 056 and
ETS 300 057, respectively.
The present version updates the references to the basic call specifications.
ETSI
5 EN 300 058-1 V1.2.4 (1998-06)
National transposition dates
Date of adoption of this EN: 19 June 1998
Date of latest announcement of this EN (doa): 30 September 1998
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 March 1999
Date of withdrawal of any conflicting National Standard (dow): 31 March 1999
ETSI
6 EN 300 058-1 V1.2.4 (1998-06)
1 Scope
This first part of EN 300 058 specifies the stage three of the Call Waiting (CW) supplementary service for the Pan-
European Integrated Services Digital Network (ISDN) as provided by European public telecommunications operators at
the T reference point or coincident S and T reference point (as defined in CCITT Recommendation I.411 [1]) by means of
the Digital Subscriber Signalling System No. one (DSS1). Stage 3 identifies the protocol procedures and switching
functions needed to support a telecommunications service (see CCITT Recommendation I.130 [2]).
In addition the present document specifies the protocol requirements at the T reference point where the service is
provided to the user via a private ISDN.
The present document does not specify the additional protocol 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 has then 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 can be applied to other circuit-switched services.
Further parts of the present document specify the method of testing required to identify conformance to the present
document.
The present document is applicable to equipment supporting the CW supplementary service, to be attached at either side
of a T reference point or coincident S and T reference point when used as an access to the public ISDN.
2 Normative references
References may be made to:
a) specific versions of publications (identified by date of publication, edition number, version number, etc.), in which
case, subsequent revisions to the referenced document do not apply; or
b) all versions up to and including the identified version (identified by "up to and including" before the version
identity); or
c) all versions subsequent to and including the identified version (identified by "onwards" following the version
identity); or
d) publications without mention of a specific version, in which case the latest version applies.
A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same
number.
[1] CCITT Recommendation I.411 (1988): "ISDN user-network interfaces - Reference configurations".
[2] CCITT Recommendation I.130 (1988): "Method for the characterisation of telecommunication
services supported by an ISDN and network capabilities of an ISDN".
[3] EN 300 196-1: "Integrated Services Digital Network (ISDN); Generic functional protocol for the
support of supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification".
[4] EN 300 403-1: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling System
No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control; Part 1:
Protocol specification [ITU-T Recommendation Q.931 (1993), modified]".
[5] EN 300 195-1: "Integrated Services Digital Network (ISDN); Supplementary service interactions;
Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification".
ETSI
7 EN 300 058-1 V1.2.4 (1998-06)
[6] EN 300 403-2: "Integrated Services Digital Network (ISDN); User-network interface layer 3;
Specification for basic call control; Specification Description Language (SDL) diagrams".
[7] CCITT Recommendation I.112: "Vocabulary of terms for ISDNs".
[8] CCITT Recommendation I.221 (1988): "Common specific characteristics of services".
[9] CCITT Recommendation I.210: "Principles of telecommunication services supported by an ISDN
and the means to describe them".
[10] EN 300 141-1: "Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary
service; Digital Subscriber Signalling System No. one (DSS1) protocol".
3 Definitions
For the purposes of the present document, the following definitions apply:
Integrated Services Digital Network (ISDN): See CCITT Recommendation I.112 [7], § 2.3, definition 308.
service; telecommunications service: See CCITT Recommendation I.112 [7], § 2.2, definition 201.
supplementary service: See CCITT Recommendation I.210 [9], § 2.4.
user: The DSS1 protocol entity at the user side of the user-network interface.
network: The DSS1 protocol entity at the network side of the user-network interface.
channels busy: See CCITT Recommendation I.221 [8], § 3.1.3.
network determined user busy: See CCITT Recommendation I.221 [8], § 3.1.4.
information channel control: A user having information channel control is a user in one of the following states: Overlap
Sending (U2); Outgoing Call Proceeding (U3); Call Delivered (U4); Call Received (U7)(Note); Connect Request
(U8)(Note); Incoming Call Proceeding (U9)(Note); Active (U10); Disconnect Request (U11); Disconnect Indication
(U12); Release Request (U19).
NOTE: Applicable only if a point-to-point configuration exists.
subscriber B: Subscriber B is the subscriber who is provided by the network with the CW supplementary service on a
particular interface.
user A: User A is a user who is engaged in a call with user B.
user B: User B is the user who reacts to the call waiting at subscriber B.
user C: User C is the user who has originated a call to subscriber B which causes the CW supplementary service to be
invoked.
4 Abbreviations
For the purposes of the present document, the following abbreviations apply:
CW Call Waiting
DSS1 Digital Subscriber Signalling System No. one
ISDN Integrated Services Digital Network
ETSI
8 EN 300 058-1 V1.2.4 (1998-06)
5 Description
The CW supplementary service allows notification to subscriber B of the incoming call.
The CW supplementary service shall operate when all appropriate B-channels of the access to the terminals of subscriber
B are busy. When at least one B-channel is free, any user B who is compatible and busy can respond to an incoming call
according to the procedures of EN 300 403-1 [4], subclause 5.2.
The network shall not provide audible in-band tone to subscriber B, but the terminals of subscriber B may generate
locally an audible in-band indication.
6 Operational requirements
6.1 Provision and withdrawal
This service may be provided by prior arrangement with the administration, or may be available on a general basis.
Withdrawal shall be at the request of the customer or for administrative reasons.
6.2 Requirements on the originating network side
Not applicable.
6.3 Requirements on the destination network side
Not applicable.
7 Coding requirements
The notification to the calling party shall be included in the Notification indicator information element specified in
EN 300 403-1 [4], subclause 4.5.22. It shall be coded as shown in table 1.
Table 1
bits
7 6 5 4 3 2 1 Meaning
1 1 0 0 0 0 0 Call is a waiting call
8 State definitions
The states associated with basic call control according to EN 300 403-1 [4] shall apply.
ETSI
9 EN 300 058-1 V1.2.4 (1998-06)
9 Signalling procedures at the coincident S and
T reference point
9.1 Activation
NOTE: Activation is a local procedure on the terminal side and does not require any user-to-network procedure.
9.2 Deactivation
NOTE: Deactivation is a local procedure on the terminal side and does not require any user-to-network procedure.
9.3 Registration
Not applicable.
9.4 Call offering
9.4.1 Normal operation
When an incoming call from user C arrives at the access of subscriber B and encounters the channels busy condition and a
network determined user busy condition does not result, then the call shall be offered to subscriber B.
In that case, the SETUP message shall be the SETUP message used in the establishment of an incoming call (as described
in subclause 5.2.1 of EN 300 403-1 [4]) indicating "no channel" in the information channel selection field of the Channel
identification information element, the bit "preferred/exclusive" being set to "indicated channel is
...