SIST ETS 300 345 E1:2003

SLOVENSKI STANDARD
01-december-2003
Digitalno omrežje z integriranimi storitvami (ISDN) – Medsebojno delovanje javnih
in zasebnih ISDN zaradi zagotavljanja telekomunikacijskih storitev – Splošni vidiki
Integrated Services Digital Network (ISDN); Interworking between public ISDNs and
private ISDNs for the provision of telecommunication services; General aspects
Ta slovenski standard je istoveten z: ETS 300 345 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 300 345
TELECOMMUNICATION January 1995
STANDARD
Source: ETSI TC-NA Reference: DE/NA-012243
ICS: 33.080
ISDN, interworking, services
Key words:
Integrated Services Digital Network (ISDN);
Interworking between public ISDNs and private ISDNs
for the provision of telecommunication services;
General aspects
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 1995. All rights reserved.
New presentation - see History box

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ETS 300 345: January 1995
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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ETS 300 345: January 1995
Contents
Foreword .5
Introduction.5
1 Scope .7
2 Normative references.7
3 Definitions.8
4 Symbols and abbreviations .9
5 Specification boundaries .9
6 Service provision .10
6.1 Relationship to stage 1 standards for public ISDNs .11
6.2 Relationship to stage 2 standards for public ISDNs .11
6.2.1 Local provision .12
6.2.2 Double provision.13
6.2.3 Cooperative provision.13
6.3 Relationship to stage 3 standards for public ISDNs .14
6.3.1 "Local" provision.14
6.3.2 "Double" provision .14
6.3.3 "Cooperative" provision .15
6.4 Relationship to standards for general procedures in public ISDNs .15
7 Public/private ISDN configurations.15
8 General requirements for interworking between public ISDNs and private ISDNs .16
8.1 Numbering .16
8.2 Accesses between public ISDNs and private ISDNs.16
8.3 Access congestion.17
8.4 Protocol requirements.17
8.5 Management.17
Annex A (informative): Bibliography.18
History.19

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ETS 300 345: January 1995
Foreword
This European Telecommunication Standard (ETS) has been produced by the Network Aspects (NA)
Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS details the general aspects of interworking between public Integrated Services Digital Networks
(ISDNs) and private ISDNs for the provision of telecommunication services.
Transposition dates
Date of latest announcement of this ETS (doa): 30 April 1995
Date of latest publication of new National Standard 31 October 1995
or endorsement of this ETS (dop/e):
Date of withdrawal of any conflicting National Standard (dow): 31 October 1995
Introduction
Work on this standard began as a result of an agreement between rapporteurs from ETSI Sub Technical
Committee (STC) NA 1 and rapporteurs from Technical Committee TC 32-TG6 of the European
Computer Manufacturers' Association (ECMA). That agreement recognised the need for a single text
which documents items that were common to supplementary services in order to avoid repetition in each
of the service descriptions.
Subsequently the text has been refined by NA 1 in consultation with Signalling, Protocols and Switching
(SPS) Technical Committee of ETSI.
This standard includes normative information on the interworking between public ISDNs and private
ISDNs. It indicates reference points where this has to occur.
The standard has been developed as a reference document for the standardisation of telecommunication
services when these services are provided in either or both ISDNs and thus service interworking becomes
necessary for calls involving both public ISDNs and private ISDNs.
In developing this standard it has been assumed that as a general rule, the same terminals can be
connected to the public ISDN or to the private ISDN.
This standard does not cover virtual private network configurations.

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1 Scope
This standard describes general requirements on standards for services with respect to interworking
between public Integrated Services Digital Networks (ISDNs) and private ISDNs. This standard describes
the different mechanisms whereby services implemented by public ISDNs can be provided to users
attached to private ISDNs.
Service specific information on the interworking between public ISDNs and private ISDNs is given in the
various standards for the individual bearer services, teleservices and supplementary services.
In addition, this standard identifies the need for general procedures in the public ISDN required to support
the transport of information given to other users as a result of the operation of services in the private
ISDN.
Consideration of regulatory requirements placed on public ISDNs and/or private ISDNs is outside the
scope of this standard.
For the purpose of this standard, only the accesses used for interworking between public ISDNs and
private ISDNs are considered. The use of accesses for any other purpose e.g. for private networking over
leased-lines via semi-permanent connections, is outside the scope of this standard.
Charging principles are outside the scope of this standard.
This standard is applicable to the stage one standards describing individual services for public ISDNs and
to standards describing general public ISDN procedures for ISDN services. This standard is also
applicable to the stage two and stage three standards for the individual services for public ISDNs
described in the stage one standards. The terms "stage one", "stage two" and "stage three" are defined in
CCITT Recommendation I.130 [1].
Standards, or parts of standards, describing requirements on private ISDNs are outside the scope of this
standard.
Furthermore, conformance to this standard is met by equipment conforming to the stage three standards
(which in turn conform to this standard and the relevant stage 1 and stage 2 standards) with the field of
application appropriate to the equipment being implemented. Conformance to this standard by the stage
1, stage 2 and stage 3 standards can be checked by inspection. Therefore, no method of testing is
provided for this standard.
2 Normative references
This standard 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 standard 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.411 (1988): "ISDN user-network interfaces - Interface
structures and access capabilities".
[3] CCITT Recommendation E.164 (1991): "Numbering plan for the ISDN era".
[4] CCITT Recommendation I.112 (1988): "Vocabulary of terms for ISDNs".
[5] CCITT Recommendation I.210 (1988): "Principles of telecommunications
services supported by an ISDN and the means to describe them".
[6] CCITT Recommendation Q.65 (1988): "Stage 2 of the method for the
characterization of services supported by an ISDN".

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3 Definitions
For the purposes of this standard, the following definitions apply:
public ISDN: An ISDN which provides services to the general public.
private ISDN: An ISDN which provides services to a specific set of users only.
S reference point: The reference point at which terminals are indirectly connected with the public ISDN,
i.e. are attached to a private ISDN and communicate with the public ISDN via a private ISDN In figures,
this reference point is denoted by S. See CCITT Recommendation I.411 [2].
T reference point: The reference point at which a private and a public ISDN are interconnected and have
to interwork for the provision of telecommunication services. In figures, this reference point is denoted by
T.
For the purpose of this standard the term "T reference point" shall always denote the service interworking
point between a public ISDN and a private ISDN, i.e. other interworking situations between the public
ISDN and other equipment, as conceivable according to CCITT Recommendation I.411 [2], are excluded.
coincident S and T reference points: These reference points coincide when terminals are directly
attached to the public ISDN. In figures, this is denoted by S/T.
NOTE: The notation S/T should not be interpreted as "either S or T".
service provider function: Within a public ISDN or private ISDN, the functionality which provides a
bearer service, or a teleservice, excluding any possible terminal functionality for that service.
terminal equipment: See CCITT Recommendation I.411 [2], § 3.4.3.
service, telecommunication service: See CCITT Recommendation I.112 [4], § 2.2, definition 201.
bearer service: See CCITT Recommendation I.112 [4], § 2.2, definition 202.
teleservice: See CCITT Recommendation I.112 [4], § 2.2, definition 203.
supplementary service: See CCITT Recommendation I.210 [5], § 2.4.
Integrated Services Digital Network (ISDN): See CCITT Recommendation I.112 [4], § 2.3,
definition 308.
served user: The user to whom a bearer service, teleservice or supplementary service is provided.
functional entity: See CCITT Recommendation Q.65 [6], § 2.1.1.
ISDN number: A number conforming to the numbering plan and structure specified in CCITT
Recommendation E.164 [3].
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4 Symbols and abbreviations
For the purposes of this standard, the following abbreviations apply:
FE Functional Entity
ISDN Integrated Services Digital Network
SPF Service Provider Function
TE Terminal Equipment
5 Specification boundaries
Standards for specific public ISDN services shall be specified in relation to users whose equipment is
connected to the public ISDN by an interface at the coincident S and T reference points. The interworking
aspects of these services with private ISDNs shall be specified in relation to T reference points.
Standards for general procedures in public ISDNs specifying interworking aspects with private ISDN
services shall be specified in relation to T reference points and, where appropriate, to coincident S and T
reference points. The standards for these general procedures shall define how the information is relayed
to the user in the other ISDN.
An overview of specification boundaries is given in figure 1.
Public ISDN Private ISDN
TE TE
S/T S
T
S/T
S
TE
TE
NOTE: For simplicity reasons, this figure shows only the connection of one private ISDN with
one public ISDN. Other configurations can also occur e.g. the configuration where one
private ISDN is connected to another private ISDN via a public ISDN.
Figure 1: Specification boundaries

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6 Service provision
This standard does not require that corresponding services in both types of ISDN are absolutely identical.
However, interworking will be more complicated when there are significant differences In order to ease
problems in interworking between services in the public ISDN and in the private ISDN, where no standard
for a particular service exists in the public ISDN, but a corresponding standard exists for the service in the
private ISDN, the private ISDN standard shall be used as the basis (and vice versa). More information can
be found in annex D of ETR 076.
In order to use a service, the served user has access to a Service Provider Function (SPF). For the
purposes of this standard, teleservices are viewed as being supported by one SPF for each of the private
ISDNs and one SPF for each of the public ISDNs involved. A standard for a teleservice in a public ISDN
shall describe bearer services and bearer capabilities required for the support of that teleservice when
interworking with private ISDNs.
Supplementary services can be supported by several cooperating SPFs in an ISDN. For the purposes of
this standard, supplementary services are viewed as being supported by one SPF for each of the private
ISDNs and one SPF for each of the public ISDNs involved. A standard for a supplementary service in a
public ISDN shall describe the requirements for the support of that supplementary service when
interworking with private ISDNs.
Where calls pass through a public ISDN and a private ISDN, the SPFs of both ISDNs will be involved (see
figure 2). For supplementary service functionality, however, one of the SPFs may be transparent.
The degree of involvement of each SPF varies, depending on the bearer service, teleservice or
supplementary service concerned. For bearer services and teleservices, ther
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