SIST ETS 300 139 E1:2003

• Abstract:

  T/NA1(89)27

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.080 - Integrated Services Digital Network (ISDN)
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI ETS 300 139 ed.1 (1992-03) - Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service; Service description

SIST ETS 300 139 E1:2003 is the Slovenian version of ETS 300 139 Edition 1, issued by SIST and based on an ETSI European Telecommunication Standard. It specifies the stage 1 service description for the Call Hold (HOLD) supplementary service in the Integrated Services Digital Network (ISDN). In practice, it tells operators and implementers how hold and retrieve are meant to work for users, including call interruption, channel reservation, interworking, and interaction with other supplementary services.

What does SIST ETS 300 139 E1:2003 specify?

SIST ETS 300 139 E1:2003 specifies the user-level service description for Call Hold (HOLD) in the pan-European ISDN. Clause 1 limits the document to stage 1 service behavior, with Stage 2 in ETS 300 140 and Stage 3 in ETS 300 141.

The scope covers:

• the behavior of HOLD for public ISDN users
• interworking requirements for private ISDNs with the public ISDN
• base functionality when the service is provided via a private ISDN
• the interactions listed in Clause 8

Clause 1 also keeps several topics outside this standard, including human-interface detail, charging principles, and use of HOLD for terminals simultaneously using more than one B-channel.

The document is organized as follows:

• Clause 1 - Scope
• Clause 2 - Normative references
• Clause 3 - Definitions
• Clause 4 - Symbols and abbreviations
• Clause 5 - Description
• Clause 6 - Procedures
• Clause 7 - Intercommunication considerations
• Clause 8 - Interaction with other supplementary services
• Annex A - Informative management of active and held calls

What are the key requirements of SIST ETS 300 139 E1:2003?

SIST ETS 300 139 E1:2003 defines how a call is placed on hold, how it is retrieved, and how network channels are reserved while the call is held. These points matter because they determine what the user can do next, what the network must keep available, and what other calls can still be handled.

Hold and retrieve behavior

Clause 5 says the HOLD supplementary service applies to basic access and primary rate access. When a user invokes HOLD, communication on the B-channel is interrupted and the channel is released from the existing call, while one B-channel is reserved for the terminal that invoked HOLD.

Clause 6.2.3.1 allows a call to be placed on hold after connection is established, and in some cases after the call has been offered to the called user. The network sends notification to the remote party that the call is on hold, and either party may clear the call using basic call procedures.

Clause 6.2.3.2 defines retrieve requests. The user may ask for any B-channel, a preferred B-channel, or one specific B-channel. If the network cannot meet the request, it rejects it with the appropriate indication.

Channel reservation

Clause 6.2.3.3 explains that one B-channel is reserved for the terminal while a call is on hold. If the same terminal places more than one call on hold, only one reservation is kept and the held calls share it. This matters for terminals and PBX-like equipment that manage more than one call at once.

Provision, withdrawal, and conformance

Clause 6.1 says HOLD may be provided by prior arrangement or made generally available, and it may be withdrawn at the customer’s request or for administrative reasons. Clause 1 states that conformance is achieved by conforming to the relevant Stage 3 standards, so this document itself provides no test method.

Interworking and service interactions

Clause 7 says the service operation is not affected by whether the far end is ISDN or non-ISDN. For private ISDNs, indications are sent to the remote network for forwarding.

Clause 8 describes interaction with other supplementary services such as call waiting, call transfer, conference services, and three party service. In practice, this tells implementers how HOLD behaves when a user alternates between calls, answers waiting calls, transfers calls, or keeps one party on hold during a three-way conversation.

What terms does SIST ETS 300 139 E1:2003 define?

• Integrated Services Digital Network (ISDN) - The digital network model used for the service description, as defined by CCITT Recommendation I.112.
• (Basic) service; telecommunications service - The underlying service on which supplementary services like HOLD are built.
• Supplementary service - A service that modifies or adds to a basic telecommunications service.
• Served user - The user who places a call on hold.
• Basic access - An ISDN access type covered by the service.
• Primary rate access - Another ISDN access type covered by the service.
• HOLD - The Call Hold supplementary service.
• PSTN - Public Switched Telephone Network.

Who uses SIST ETS 300 139 E1:2003?

SIST ETS 300 139 E1:2003 is used by ISDN service providers, network operators, and equipment implementers who need to define or support Call Hold behavior. It is also relevant to private ISDN operators who must interwork with the public ISDN.

Engineers use it when implementing hold and retrieve handling, B-channel reservation, and notifications to the remote party. Quality and product teams use it to check that terminal behavior matches the service model and that interactions with call waiting, transfer, conferencing, and three party service are handled consistently.

What changed in SIST ETS 300 139 E1:2003 from the previous edition?

SIST ETS 300 139 E1:2003 is stated to be identical to ETS 300 139 Edition 1. The document history records March 1992 as the first edition and January 1996 as a conversion to PDF, and the page notes a new presentation.

Which standards are used with SIST ETS 300 139 E1:2003?

• CCITT Recommendation I.130 - Provides the three-stage method used to describe ISDN supplementary services.
• CCITT Recommendation I.112 - Supplies ISDN vocabulary, including the definitions of ISDN and basic service.
• CCITT Recommendation I.210 - Gives the principles for describing telecommunication services supported by ISDN.
• CCITT Recommendation Q.9 - Provides switching and signalling vocabulary, including basic access and primary rate access.
• ETS 300 140 (1992) - Covers the Stage 2 aspects of the HOLD supplementary service.
• ETS 300 141 (1992) - Covers the Stage 3 aspects of the HOLD supplementary service.

What does the SIST ETS 300 139 E1:2003 document contain?

The document gives the service description, the normal and exceptional procedures for hold and retrieve, and the rules for B-channel reservation. It also includes interworking considerations for non-ISDNs and private ISDNs, plus a set of service interactions in Clause 8.

Annex A is informative and explains how a user manages active and held calls. It covers switching between calls, disconnecting active or held parties, establishing another call, and invoking explicit call transfer, three party service, or conference call, add-on.

The structure is useful for implementers because it separates the service model from the supporting protocol standards. The document also points readers to the stage 2 and stage 3 specifications where detailed network behavior and signalling are defined.

SLOVENSKI STANDARD
01-december-2003
Digitalno omrežje z integriranimi storitvami (ISDN) – Dopolnilna storitev: zadržanje
klica (HOLD) – Opis storitve
Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service;
Service description
Ta slovenski standard je istoveten z: ETS 300 139 Edition 1
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.

EUROPEAN ETS 300 139
TELECOMMUNICATION March 1992
STANDARD
Source: ETSI TC-NA Reference: T/NA1(89)27
ICS: 33.080
ISDN, supplementary service
Key words:
Integrated Services Digital Network (ISDN);
Call Hold (HOLD) supplementary service
Service description
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 1992. All rights reserved.
New presentation - see History box

Page 2
ETS 300 139: March 1992
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.

Page 3
ETS 300 139: March 1992
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions.8
4 Symbols and abbreviations .8
5 Description .8
6 Procedures.9
6.1 Provision and withdrawal .9
6.2 Normal procedures .9
6.2.1 Activation, deactivation and registration.9
6.2.2 Erasure.9
6.2.3 Invocation and operation .9
6.2.3.1 Hold request .9
6.2.3.2 Retrieve request .10
6.2.3.3 Reservation processing .10
6.2.4 Interrogation .10
6.3 Exceptional procedures .10
6.3.1 Activation, deactivation and registration.10
6.3.2 Erasure.11
6.3.3 Invocation and operation .11
6.3.3.1 Hold request .11
6.3.3.2 Retrieve request .11
6.3.4 Interrogation .11
7 Intercommunication considerations.11
7.1 Interworking with non-ISDNs .11
7.2 Interworking with private ISDNs.11
8 Interaction with other supplementary services .11
8.1 Advice of charge services.11
8.1.1 Charging information at call set-up time.11
8.1.2 Charging information during the call.11
8.1.3 Charging information at the end of the call.11
8.2 Call waiting.12
8.3 Call hold .12
8.4 Call transfer services .12
8.4.1 Explicit call transfer .12
8.4.2 Single-step call transfer.12
8.5 Number identification services.12
8.5.1 Calling line identification presentation .12
8.5.2 Calling line identification restriction .12
8.5.3 Connected line identification presentation.12
8.5.4 Connected line identification restriction.12
8.6 Closed user group.13
8.7 Completion of calls to busy subscribers .13
8.8 Conference services .13
8.8.1 Conference call, add-on .13
8.8.2 Meet-me conference .13
8.9 Direct dialling in.13
8.10 Diversion services.13

Page 4
ETS 300 139: March 1992
8.10.1 Call forwarding unconditional. 13
8.10.2 Call forwarding busy . 13
8.10.3 Call forwarding no reply . 13
8.10.4 Call deflection . 13
8.11 Freephone. 13
8.12 Malicious call identification. 14
8.13 Multiple subscriber number . 14
8.14 Sub-addressing . 14
8.15 Terminal portability. 14
8.16 Three party service. 14
8.17 User-to-user signalling . 14
Annex A (Informative): Management of active and held calls . 15
A.1 Introduction. 15
A.2 Functionality available to the served user controlling more than one call. 15
History. 16

Page 5
ETS 300 139: March 1992
Foreword
This European Telecommunication Standard (ETS) has been produced by the Network Aspects (NA)
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 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.
This standard details the stage 1 aspects (overall service description) for the Call Hold (HOLD)
supplementary service. The stage 2 and stage 3 aspects are detailed in ETS 300 140 (1992) and
ETS 300 141 (1992), respectively.

Page 6
ETS 300 139: March 1992
Blank page
Page 7
ETS 300 139: March 1992
1 Scope
This standard defines the stage one of the Call Hold (HOLD) supplementary service for the pan-European
Integrated Services Digital Network (ISDN) as provided by European public telecommunications
operators. Stage one is an overall service description from the user's point of view (see CCITT
Recommendation I.130 [1]), but does not deal with the details of the human interface itself.
This standard defines the interworking requirements of private ISDNs with the public ISDN.
In addition this standard specifies the base functionality where the service is provided to the user via 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 but does include interworking requirements of other
networks with the public ISDN.
Interactions with supplementary services not listed in Clause 8 are outside the scope of this standard.
Charging principles are outside the scope of this standard.
The HOLD supplementary service allows a user to interrupt communications on an existing call and then
subsequently, if desired, re-establish communications.
Use of the HOLD supplementary service to hold calls by terminals simultaneously using more than one B-
channel is outside the scope of this standard.
The HOLD supplementary service is applicable to all circuit mode basic telecommunications services.
Although it may not be meaningful for some services, the network will not restrict its applicability.
This standard is applicable to the stage two and stage three standards for the ISDN HOLD supplementary
service. The terms "stage two" and "stage three" are also defined in CCITT Recommendation I.130 [1].
Where the text indicates the status of a requirement, (i.e. as strict command or prohibition, as
authorisation leaving freedom, as a capability or possibility), this shall be reflected in the text of the
relevant stage two 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 I.112 (1988): "Vocabulary of terms for ISDNs".
[3] CCITT Recommendation I.210 (1988): Principles of telecommunication services
supported by an ISDN and the means used to describe them".
[4] CCITT Recommendation Q.9 (1988): "Vocabulary of switching and signalling
terms".
Page 8
ETS 300 139: March 1992
3 Definitions
For the purposes of this standard, the following definitions apply:
Integrated Services Digital Network (ISDN): see CCITT Recommendation I.112 [2], § 2.3, definition
308.
(Basic) service; telecommunications service: see CCITT Recommendation I.112 [2], § 2.2, definition
201.
Supplementary service: see CCITT Recommendation I.210 [3], § 2.4.
Served user: the user who places a call on hold.
Basic access: see CCITT Recommendation Q.9 [4], § 1, definition 1551.
Primary rate access: see CCITT Recommendation Q.9 [4], § 1, definition 1552.
4 Symbols and abbreviations
HOLD Call Hold
ISDN Integrated Services Digital Network
PSTN Public Switc
...