ETSI EN 300 141-1 V1.2.4 (1998-06)

SLOVENSKI STANDARD
SIST EN 300 141-1 V1.2.4:2005
01-april-2005
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Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service;
Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol
specification
Ta slovenski standard je istoveten z: EN 300 141-1 Version 1.2.4
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST EN 300 141-1 V1.2.4:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 300 141-1 V1.2.4:2005

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SIST EN 300 141-1 V1.2.4:2005
EN 300 141-1 V1.2.4 (1998-06)
European Standard (Telecommunications series)
Integrated Services Digital Network (ISDN);
Call Hold (HOLD) supplementary service;
Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification

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SIST EN 300 141-1 V1.2.4:2005
2 EN 300 141-1 V1.2.4 (1998-06)
Reference
REN/SPS-05145-S-1 (1b090iqo.PDF)
Keywords
ISDN, HOLD, DSS1, supplementary service
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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

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SIST EN 300 141-1 V1.2.4:2005
3 EN 300 141-1 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 . 7
6 Operational requirements . 7
6.1 Provision and withdrawal.7
6.2 Requirements on the originating network side.7
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 Holding a call - procedures at the interface of user A.9
9.1.1 Normal operation .9
9.1.2 Exceptional procedures.9
9.2 Holding a call - procedures at the interface of user B.10
9.2.1 Normal operation .10
9.2.2 Exceptional procedures.10
9.3 Retrieving a call - procedures at the interface of user A.10
9.3.1 Normal operation .10
9.3.2 Exceptional procedures.10
9.4 Retrieving a call - procedures at the interface of user B.10
9.4.1 Normal operation .10
9.4.2 Exceptional procedures.11
10 Procedures for interworking with private ISDNs . 11
10.1 User A is on a private ISDN .11
10.1.1 Normal operation .11
10.1.2 Exceptional procedures.11
10.2 User B is on a private ISDN .11
10.2.1 Normal operation .11
10.2.2 Exceptional procedures.11
11 Interactions with other networks. 11
12 Interactions with other supplementary services. 12
13 Parameter values (timers). 12
14 Dynamic description (SDL diagrams). 12
Annex A (informative): Signalling flows . 19
Annex B (informative): Changes with respect to the previous ETS 300 141-1. 20
History. 21
ETSI

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SIST EN 300 141-1 V1.2.4:2005
4 EN 300 141-1 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 Hold (HOLD) 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 telecommunication 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 stand-point;
- 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 stage 3 aspects (signalling system protocols and switching functions) needed to support the
Call Hold (HOLD) supplementary service. The stage 1 and stage 2 aspects are detailed in ETS 300 139 and
ETS 300 140, respectively.
The present version updates the references to the basic call specifications.
ETSI

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SIST EN 300 141-1 V1.2.4:2005
5 EN 300 141-1 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

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SIST EN 300 141-1 V1.2.4:2005
6 EN 300 141-1 V1.2.4 (1998-06)
1 Scope
This first part of EN 300 141 specifies the stage three of the Call Hold supplementary (HOLD) 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) protocol. Stage three 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 HOLD supplementary service allows a user to interrupt communications on an existing call and then subsequently, if
desired, re-establish communications.
The HOLD supplementary service is applicable to all circuit-switched telecommunication 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 HOLD 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] CCITT Recommendation I.112: "Vocabulary of terms for ISDNs".
[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 300 196-1: "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".
[6] EN 300 195-1: "Integrated Services Digital Network (ISDN); Supplementary service interactions;
Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification".
[7] CCITT Recommendation Z.100 1988): "Functional Specification and Description Language (SDL)".
ETSI

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SIST EN 300 141-1 V1.2.4:2005
7 EN 300 141-1 V1.2.4 (1998-06)
[8] CCITT Recommendation I.210: "Principles of telecommunication services supported by an ISDN
and the means to describe them".
3 Definitions
For the purposes of the present document, the following definitions apply:
basic service: A bearer service or teleservice. The terms bearer service and teleservice are defined in CCITT
Recommendation I.112 [3], § 2.2, definitions 202 and 203, respectively.
Integrated Services Digital Network (ISDN): See CCITT Recommendation I.112 [3], § 2.3, definition 308.
network: The DSS1 protocol entity at the network side of the user-network interface.
service; telecommunication service: See CCITT Recommendation I.112 [3], § 2.2, definition 201.
supplementary service: See CCITT Recommendation I.210 [8], § 2.4.
user A: The user which invokes the HOLD supplementary service for a given call. User A is the served user.
user B: The user engaged in the given call with user A. User B is the non-served user.
user: The DSS1 protocol entity at the user side of the user-network interface.
4 Abbreviations
For the purposes of the present document, the following abbreviations apply:
DSS1 Digital Subscriber Signalling System No. one
HOLD Call Hold
ISDN Integrated Services Digital Network
5 Description
When the HOLD supplementary service is invoked, communication on a B-channel shall be interrupted, the B-channel
shall be released, a B-channel shall be reserved by the network for subsequent reuse by user A.
6 Operational requirements
6.1 Provision and withdrawal
The HOLD supplementary service may be available by prior arrangement with the service provider or it may be generally
available. Withdrawal shall be at the request of the customer or for administrative reasons.
NOTE: As the HOLD supplementary service can often be used together with other supplementary services (e.g. ca
...