ETSI ETS 300 058-1 ed.1 (1991-10)

Integrated Services Digital Network (ISDN); Call Waiting (CW) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification

T/S 46-33F

Digitalno omrežje z integriranimi storitvami (ISDN) - Dopolnilna storitev: čakajoči klic (CW) - Protokol digitalne naročniške signalizacije št. 1 (DSS1) - 1. del: Specifikacija protokola

General Information

• Status: Published
• Publication Date: 04-Nov-1991
• Technical Committee: SPS 5 - Digital access signalling
• Current Stage: 12 - Completion
• Due Date: 12-Jun-1991
• Completion Date: 05-Nov-1991
• Ref Project: SIST ETS 300 058-1 E1:2005 - Integrated Services Digital Network (ISDN); Call Waiting (CW) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 058-1 E1:2005
01-julij-2005
'LJLWDOQRRPUHåMH]LQWHJULUDQLPLVWRULWYDPL,6'1'RSROQLOQDVWRULWHYþDNDMRþL
NOLF&:3URWRNROGLJLWDOQHQDURþQLãNHVLJQDOL]DFLMHãW'66GHO
6SHFLILNDFLMDSURWRNROD
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: ETS 300 058-1 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST ETS 300 058-1 E1:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 058-1 E1:2005

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SIST ETS 300 058-1 E1:2005
EUROPEAN ETS 300 058-1
TELECOMMUNICATION October 1991
STANDARD
Source: ETSI TC-SPS Reference: T/S 46-33F
ICS: 33.080
ISDN, supplementary service
Key words:
Integrated Services Digital Network (ISDN);
Call Waiting (CW) supplementary service;
Digital subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification
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 1991. All rights reserved.
New presentation - see History box

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ETS 300 058-1: October 1991
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.9
5 Description .9
6 Operational requirements.9
6.1 Provision and withdrawal .9
6.2 Requirements on the originating network side.9
6.3 Requirements on the destination network side .9
7 Coding requirements.9
8 State definitions .9
9 Signalling procedures at the coincident S and T reference point . 10
9.1 Activation. 10
9.2 Deactivation. 10
9.3 Registration . 10
9.4 Call offering. 10
9.4.1 Normal operation. 10
9.4.2 Exceptional procedures. 10
9.5 Call confirmation . 10
9.5.1 Normal operation. 10
9.5.1.1 Network determined user busy . 10
9.5.1.2 Subscriber resources in use . 11
9.5.2 Exceptional procedures. 11
9.6 Call waiting acceptance. 11
9.6.1 Normal operation. 11
9.6.2 Exceptional procedures. 12
10 Procedures for interworking with private ISDNs . 13
10.1 Served user is on a private ISDN. 13
10.2 Calling user is on a private ISDN . 13
11 Interaction with other networks. 13
12 Interaction with other supplementary services. 13
13 Parameter values. 13
14 Dynamic description (SDLs) . 13
Annex A (Informative): Signalling flows . 14
History. 19

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ETS 300 058-1: October 1991
Foreword
This European Telecommunication Standard (ETS) has been produced by the Signalling Protocols and
Switching (SPS) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS 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: "TSS&TP specification for the network";
Part 6: "ATS and partial 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.
This ETS 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 (1991) and ETS 300 057 (1991), respectively.
This reprint includes all previous Corrigenda as shown in the History box at the last page.

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1 Scope
This first part of ETS 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 this standard specifies the protocol requirements at the T reference point where the service is
provided to the user via a private ISDN.
This standard 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 this standard specify the method of testing required to identify conformance to this
standard.
This standard 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
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 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.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] ETS 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] ETS 300 102-1 (1990): "Integrated Services Digital Network (ISDN); User-
network interface layer 3; Specifications for basic call control".
[5] ETS 300 195-1: "Integrated Services Digital Network (ISDN); Supplementary
service interactions; Digital Subscriber Signalling System No. one (DSS1)
protocol; Part 1: Protocol specification".
[6] ETS 300 102-2 (1990): ""Integrated Services Digital Network (ISDN); User-
network interface layer 3; Specification for basic call control; Specification
Description Language (SDL) diagrams".

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[7] CCITT Recommendation I.112 (1988): "Vocabulary of terms for ISDNs".
[8] CCITT Recommendation I.221 (1988): "Common specific characteristics of
services".
[9] CCITT Recommendation I.210 (1988): "Principles of telecommunication services
supported by an ISDN and the means to describe them".
[10] ETS 300 141: "Integrated Services Digital Network (ISDN); Call Hold (HOLD)
supplementary service; Digital Subscriber Signalling System No. one (DSS1)
protocol".
3 Definitions
For the purposes of this standard, 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.

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4 Symbols and abbreviations
CW Call Waiting
DSS1 Digital Subscriber Signalling System No. one
ISDN Integrated Services Digital Network
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 ETS 300 102-1 [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 ETS 300 102-1 [4], subclause 4.5.21. 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 ETS 300 102-1 [4] shall apply.

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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 ETS 300 102-1 [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 preferred".
If a B-channel is available, the call shall be offered to subscriber B in accordance with subclause 5.2.1 and
subclause 5.2.3 of ETS 300 102-1 [4].
9.4.2 Exceptional procedures
Not applicable.
9.5 Call confirmation
9.5.1 Normal operation
The busy users that have information channel control and are compatible with the incoming call can
proceed with the call. Those users shall respond by sending an ALERTING message to the network,
possibly following a SETUP ACKNOWLEDGE or a CALL PROCEEDING message, in accordance with
subclause 5.2.5.1 of ETS 300 102-1 [4].
The action to be taken by the network on receipt of the ALERTING message shall be the same as for
basic call control procedures (see subclause 5.2.5.2 of ETS 300 102-1 [4]).
9.5.1.1 Network determined user busy
If the call has been offered with the "no B-channel condition", timer T-CW may be started instead of timer
T301.
The use of timer T-CW is a network option. If used, timer T-CW replaces the basic call timer T301.
The user shall not return the Channel identification information element in the SETUP ACKNOWLEDGE,
CALL PROCEEDING or ALERTING mess
...