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

ISDN User-Network Layer 3 Signalling Protocols for Supplementary Services

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
30-Jun-2005
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Jul-2005
Due Date
01-Jul-2005
Completion Date
01-Jul-2005

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SLOVENSKI STANDARD
SIST ETS 300 058-1 E1:2005
01-julij-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: 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 - 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 1991. All rights reserved.
New presentation - see History box
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SIST ETS 300 058-1 E1:2005
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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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SIST ETS 300 058-1 E1:2005
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ETS 300 058-1: October 1991
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
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SIST ETS 300 058-1 E1:2005
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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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ETS 300 058-1: October 1991
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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ETS 300 058-1: October 1991
[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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ETS 300 058-1: October 1991
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
...

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