ISO/IEC 11574:1994

Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Circuit-mode 64 kbit/s bearer services - Service description, functional capabilities and information flows

Technologies de l'information — Télécommunications et échange d'information entre systèmes — Réseau privé avec intégration de services — Services porteurs sur 8 kilo-octets par seconde en mode circuit — Description du service, aptitudes fonctionnelles et courants d'information

General Information

• Status: Withdrawn
• Publication Date: 07-Dec-1994
• Withdrawal Date: 07-Dec-1994
• ICS: 33.040.35 - Telephone networks
• Technical Committee: ISO/IEC JTC 1/SC 6 - Telecommunications and information exchange between systems
• Drafting Committee: ISO/IEC JTC 1/SC 6 - Telecommunications and information exchange between systems
• Current Stage: 9599 - Withdrawal of International Standard
• Start Date: 24-Mar-2000
• Completion Date: 30-Oct-2025

Relations

• Consolidated By: ISO 286-1:2010 - Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes - Part 1: Basis of tolerances, deviations and fits
• Effective Date: 06-Jun-2022
• Amended By: ISO/IEC 11574:1994/Amd 1:1997 - Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Circuit-mode 64 kbit/s bearer services - Service description, functional capabilities and information flows - Amendment 1: Additional progress descriptions
• Effective Date: 06-Jun-2022
• Revised: ISO/IEC 11574:2000 - Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Circuit-mode 64 kbit/s bearer services - Service description, functional capabilities and information flows
• Effective Date: 15-Apr-2008
• Parent: ISO/IEC 11574:1994/Amd 1:1997 - Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Circuit-mode 64 kbit/s bearer services - Service description, functional capabilities and information flows - Amendment 1: Additional progress descriptions
• Effective Date: 15-Apr-2008

Standards Content (Sample)

INTERNATIONAL
STANDARD
First edition
1994-12-15
Information technology -
Telecommunications and information
exchange between Systems - Private
Integrated Services Network -
Circuit-mode 64 kbit/s bearer Services -
Service description, functional capabilities
and information flows
Technologies de I ’informa tion - T6l6communications et 6change
d ‘in forma tion en tre sys temes - Rbseau priv6 avec integration de
Services - Services porteurs sur 8 kilo-octets par seconde en mode
circuit - Description du Service, aptitudes fonctionnelles et couran ts
d ’information
Reference number
ISO/IEC 11574: 1994 (E)
Contents
. . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Foreword
iv
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section 1:
1 scope 1
........................................................................................................
2 Normative references
........................................................................................
International Standards
2.1
.....................................................................................
2.2 ITU-T Recomrnendations
3 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Symbols and abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
........................................................................................
5 Provision of Services by a PISN
5.1 Bearer Services .
Teleservices .
5.2
.........................................................................................
5.3 Control and signalling
.................................................................................
5.4 Interworking considerations
Service model .
5.5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section 2 : Service Description, (Stage 1 description)
....................
.4
6 Circuit-mode 64 kbit/s unrestricted 8 kHz structured bearer service category
6.1 Definition .
6.2 Description .
6.3 Procedures .
Network capability for charging .
6.4
Interworking considerations .
6.5
.... .5
6.5.1 Interworking with a public ISDN and certain other digital network
6.5.2 Interworking with networks supporting only a restricted digital
information transfer capability .
6.5.3 Interworking with analogue networks .
...................................................................
6.6 Static Description: Service Attributes
7 Circuit-mode 64 kbit/s 8 kHz structured bearer service category usable for Speech
information transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*.
@ ISO/IEC 1994
All rights reserved. No part of this publication may be reproduced or utilised in any form or by any means,
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ISO/IEC Copyright Office l Case postale 56 l CH-1 211 Gen&e 20 l Switzerland
Printed in Switzerland
ii
ISO/IEC 11574: 1994 (E)
...........................................................................................................
7.1 Definition
.........................................................................................................
7.2 Description
..........................................................................................................
7.3 Procedures
.......................................................................... 6
7.4 Network capability for charging
Interworking considerations . 6
7.5
7.5.1 Interworking with a public ISDN and certain other Digital Networks .6
7.5.2 Interworking with analogue networks .
7.5.3 Encoding law conversion .
Static Description: Service Attributes .
7.6
Circuit-mode 64 kbit/s 8 kHz structured bearer service category usable for 3,l kHz audio
information transfer .
8.1 Definition .
8.2 Description .
8.3 Procedures .
..........................................................................
8.4 Network capability for charging
................................................................................
8.5 Interworking considerations
Interworking with a public ISDN and certain other Digital Networks .7
8.5.1
8.5.2 Interworking with analogue networks .
Encoding law conversion .
8.5.3
Static Description: Service Attributes .
8.6
............................................................... 8
Comrnon procedures for services within a PISN
Provision of services .
9.1
Normal procedures .
9.2
......................................... 8
9.2.1 Cal1 establishment at the calling PISN user
.......................................... 9
9.2.2 Cal1 establishment at the called PISN user
.................................................. 9
9.2.3 Termirrating the service (cal1 release)
................................................... 10
Exceptional procedures/unsuccessful outcome
9.3
..................................................................................................................
10 Interworking
................................................................. 10
10.1 General Interworking considerations
.................................................................................. 10
10.1.1 Incoming calls
.................................................................................. 11
10.1.2 Outgoing calls
.............................................................................. 11
10.1.3 PISN transit calls
......................................................................... 11
10.2 Interworking with public-ISDN
.................................. 11
10.2.1 Receipt of service request from a public ISDN
....................................... 12
10.2.2 Sending a service request to a public ISDN
................................ 12
10.2.3 Receipt of a Service response from public ISDN
.......................................... 12
10.2.4 Sending Service response to public ISDN
. . .
ISOLEC 11574: 1994 (E)
11 Dynamit Description .
..................... .15
Section 3 : Functional capabilities and information flows, (Stage 2 description)
12 Functional model .
12.1 Functional model description .
12.2 Description of the fimctional entities .
12.2.1 Cal1 Control Agent fimctional entity .
.................................. 15
12.2.1.1 Originating CCA fimctional entity
12.2.1.2 Destination CCA functional entity . 16
Cal1 Control fimctional entity .
12.2.2
12.2.2.1 Originating CC functional entity . 16
12.2.2.2 Destination CC functional entity . 16
Transit CC functional entity . 16
12.2.2.3
Incoming and Outgoing Gateway CC fbnctional entities .17
12.2.2.4
.......................................................................................
13 Definition of information flows
............................ 17
13.1 Conventions used within the description of information flows
13.1.1 Convention for the description of mandatory or optional information 17
................................ 17
13.1.2 Convention for the naming of information flows
13.2 SETUP .
13.3 REPORT .
........................................................................
13.4 CHANNEL ACKNOWLEDGE
-
....................................................................................
13.5 CHANNEL-CONNECT
13.6 DISCONNECT .
RELEASE .
13.7
...............................................................................................
13.8 INFORMATION
13.9 SETUPJEJECT .
13.10 PROCEEDING .
14 Information flow sequences .
14.1 Functional entity actions .
.....................................................
14.1.1 Originating CCA functional entity
.......................................................
14.1.2 Originating CC functional entity
..............................................................
14.1.3 Transit CC functional entity
........................................................
14.1.4 Destination CC functional entity
.....................................................
14.1.5 Destination CCA fimctional entity
.............................................
14.1.6 Incoming gateway CC functional entity
.............................................
14.1.7 Outgoing gateway CC functional entity
................................................................................. 29
14.2 Normal cal1 establishment
..3 0
14.3 Normal cal1 establishment with digit-bydigit sending and automatic answer. .
iv
ISO/IEC 11574: 1994 (E)
.................... 3 1
14.4 Unsuccessful calls with the provision of tones and announcements
............... 32
14.5 UnsuccessM calls without the provision of tones and announcements
.......................................................... 33
14.6 Incoming interworking with a non-ISDN
.......................................................... 34
14.7 Outgoing interworking with a non-ISDN
14.8 Outgoing interworking with digit-bydigit sending . 35
14.9 Basic cal1 Clearing .
14.10 Incoming interworking with a public ISDN .
14.11 Outgoing interworking with a public ISDN .
15 SDL diagrams for functional entities .
............................................. 39
15.1 Originating CCA ftmctional entity SDL diagrams
................................. 39
15.1.1 Originating CCA states used in SDL diagrams
....................................................... 39
15.1.2 Originating CCA SDL diagrams
...............................................
15.2 Originating CC functional entity SDL diagrams
Originating CC states used in SDL diagrams .
15.2.1
15.2.2 Originating CC SDL diagrams .
......................................................
15.3 Transit CC functional entity SDL diagrams
Transit CC states used in SDL diagrams .
15.3.1
Transit CC SDL diagrams .
15.3.2
15.4 Destination CC functional entity SDL diagrams .
.................................... 53
15.4.1 Destination CC states used in SDL diagrams
.......................................................... 53
15.4.2 Destination CC SDL diagrams
.............................................
15.5 Destination CCA functional entity SDL diagrams
..................................
15.5.1 Destination CCA states used in SDL diagram
.......................................................
5.5.2 Destination CCA SDL diagrams
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
16 Allocation of functional entities to physical entities
Service attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Annex A:
Annex B: Telephony Teleservice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Annex C: Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ISO/IEC 11574: 1994 (E)
Foreword
ISO (the International Organization for Standardization) and IEC (the Inter-
national Electrotechnical Commission) form the specialized System for worldwide
standardization. National bodies that are members of ISO or IEC participate in the
development of International Standards through technical committees established
by the respective organization to deal with particular fields of technical activity.
ISO and IEC technical committees collaborate in fields of mutual interest. Other
international organizations, governmental and non-governmental, in liaison with
ISO and IEC, also take part in the work.
In the field of information technology, ISO and IEC have established a joint
technical committee, ISO/IEC JTC 1. Draft International Standards adopted by the
joint technical committee are circulated to national bodies for voting. Publication
as an International Standard requires approval by at least 75 % of the national
bodies casting a vote.
International Standard ISO/IEC 11574 was prepared by Joint Technical
Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 6,
Telecommunications and information exchange between Systems.
Annexes A and B form an integral part of this International Standard. Annex C is
for information only.
Vi
ISO/IEC 11574: 1994 (E)
Introduction
This International Standard is one of a set of International Standards produced to facilitate the
interconnection of private telecommunication systems (such as PBXs) so as to form private
networks that are able to offer integrated services to users and which are also able to interwork
with the public ISDN.
According to the methods described in ITU-T Recommendations 1.130 and 4.65, service
specifications are produced in three Stages. This International Standard specifies the Stage 1,
Service description and Stage 2, Functional capabilities and information flows for 64 kbit/s
circuit mode bearer services.
One of the purposes of the Stage 1 and Stage 2 specifications is to guide and constrain the work
on signalling protocols at Stage 3, and therefore this International Standard is concemed mainly
with the control aspects of Services. The attributes of the user information transfer capability for
each of the services are also described. Detailed requirements of user information protocols and
switching functions are outside the scope of this International Standard.
A Stage 3 International Standard shall be in conformance with the Stage 1 and Stage 2
specifications contained in this International Standard, if the signalling protocols and
equipment behaviour specified in the Stage 3 International Standard are capable of being used in
a Private Integrated Services Network, PISN that supports any or all of the basic services
specified in this International Standard. In particular, the Stage 3 International Standards shall
be adequate for the support of
common aspects of the control of basic Services, as seen by the PISN User, as specified in
clauses 9 and 10,
the control of the individual basic Services specified in clauses 6,7, 8, and Annex A,
l the functional entities, functional entity allocations and information flows identified in
clauses 12, 13,14 and 16, and
l interworking with the public ISDN as specified in clause 10.2
The technical contents of this International Standard are organised into three sections:
Section 1: General
This section is informative only and contains background information related to methodologies,
models and description techniques.
Section 2: Service Description (Stage 1)
This section contains the Service descriptions from the point of view of the User, and is
normative.
Clauses 6 to 8 contain the static descriptions including definition, description, Service
interworking and service attributes of the three Services. The procedures for invocation and
termination of the Services are common for all three Services and are specified in clause 9 for
calls intemal to a PISN. The procedure for calls where interworking with another network
occurs are specifled in clause 10.
The dynamic Service description, using SDL is presented in Clause 11.
vii
ISOKEC 11574: 1994 (E)
Section 3: Functional capabilities and information flows (Stage 2)
This section is normative and spedies the functional capabilities and the information flows
needed to the Service.
support
Clause 12 specifies the functional model, and clauses 13 and 14 spec@ the information flow
and sequences for a number of common cal1 cases. Clause 15 gives the SDL diagrams for the
functional entities, and clause 16 Shows the possible allocation of functional entities to network
components.
Annex A provides a listing of service attributes as given in ITU-T Recommendation 1.140.
Annex B describes the relationship between the bearer services specified in this International
Standard and the Teleservice, Telephony.
Annex C is a list of useful references. It is not normative.
This International Standard and a companion International Standard “Information technology -
Telecommunications and information exchange between systems - Private Integrated Services
Network - Circuit mode basic Services - Inter-exchange signalling procedures and protocol”
have been prepared in parallel and have been approved at the same time.
The 64 kbit/s circuit mode bearer services specified in this International Standard complement
and are compatible with the corresponding services for public ISDN as specified in KU-T
Recommendation 1.23 1 for Stage 1 and Recommendation Q.71 for Stage 2. Some of the
terminology used in this International Standard is different from the public ISDN terminology,
and where appropriate new terms have been defined.
This International Standard is based upon the European Computer Manufacturer ’s Association
Standard, ECMA- 143.
. . .
VW
INTERNATIONAL STANDARD @ISO/IEC ISO/IEC 11574: 1994 (E)
Information technology - Telecommunications and information exchange between
Systems - Private Integrated Services Network - Circuit-mode 64 kbit/s bearer
Services - Service description, functional capabilities and information flows
Originating Number or the Connected Number of a cal1
Section 1: General
from or to a public ISDN is regarded as part of the basic
Services in a PISN.
1 Scope
6. The Provision (either explicitly or implicitly) by the User
to the network, of its own number (Originating Number
This International Standard specifies the service
or Connected Number), and the Provision of an Originat-
description and control aspects, including functional
ing Number or a Connected Number by a PISN to another
capabilities and information flows, of standardised circuit-
network is a part of the basic Services in a PISN and not a
mode bearer services which may be supported by a Private
part of the Calling Line Identification Presentation and
Integrated Services Network (PEN).
Connected Line Identification Presentation supplementary
Services. Those supplementary Services are concemed
This International Standard includes the following basic
only with the presentation of the number fiom the
Services:
network to the served PISN User.
l Circuit-mode 64 kbit/s unrestricted 8 kHz structured
bearer Service category;
2 Normative references
l Circuit-mode 64 kbit/s 8 kHz structured bearer
service category usable for Speech information
The following standards contain provisions which, through
transfer;
reference in this text, constitute provisions of this Intema-
l Circuit-mode 64 kbit/s 8 & structured bearer tional Standard. At the time of publication, the editions
service category usable for 3,l kHz audio infor- indicated were valid. All Standards are subject to revision,
mation transfer. and Parties to agreements based on this International Stan-
dard are encouraged to investigate the possibility of apply-
A PISN shall support at least one of the above three bearer
ing the most recent editions of the Standards indicated
services to conform with this International Standard.
below. Members of IEC and ISO maintain registers of
The scope of this International Standard does not include:
currently valid International Standards.
l the negotiation of service at cal1 establishment time,
2.1 International Standards
l the Change of service during a call, and
ISODX 1157 1: 1994, Information technology - Tele-
l unidirectional services.
communications and information exchange between
This International Standard includes optional procedures
systems - Numbering and sub-addressing in private inte-
for the Provision of functions equivalent to the following
grated Services network.
public ISDN supplementary Services: Subaddress and
ISOIIEC 11579-1: 1994, Information Technology - Tele-
Multiple Subscriber Number.
exchange between
communications and information
NOTES
systems - Private integrated Services network - Part 1:
Reference conflguration for PISN Exchanges (ZPINX).
1. Supplementary services and other bearer services which
tan be used in conjunction with 64 kbits/s circuit
switched bearer Services specified in this International
2.2 ITU-T Recommendations
Standard are dealt with in other International Standards.
Recommendation G.7 11 (1992), Primary PC. ‘. multiplex
2. Service specifications are based on information concem-
equipment for voice frequencies
ing the corresponding public ISDN Service available at
time of publication of this International Standard.
Recommendation 1.112 (1992), Vocabulary of terms for
3. KU-T treat Subaddressing and Multiple Subscriber
ISDNs.
Number as supplementary Services.
Recommendation 1.130 (1992), Method for the characteri-
4. The use of the Direct Dia1 In supplementary service of a
sation of telecommunication Services supported by an
public ISDN for calls incoming to a PISN Flom a public
ISDN and network capabilities of an ISDN.
ISDN is regarded as part of the basic Services in a PISN.
Recommenc&ion 1.140 (1992), Attribute technique for the
5. The use of the Calling Line Identification Presentation
characterisation of telecommunications Services supported
and Connected Line Identification Presentation supple-
by an ISDN and network capabilities of an ISDN.
mentary Services of a public XSDN for obtaining the
0 ISO/IEC
ISOAEC 11574: 1994 (E)
Recommendation 1.2 10 (1992), Principles of telecommu- connection handling functions used for the Provision of
nications Services supported by an ISDN and the means to telecommunication services. A nodal entity may consist of
describe them. one or more nodes.
Recommendation 1.23 1 (1992), Circuit-mode bearer serv- 3.7 PISN User: An entity which uses telecommunica-
ice categories tion services offered by a PISN, and which therefore
directly or indirectly uses the services of the Network
Recommendation 1.25 1.1 (1992), Number Identifiation
Layer.
Supplementary Services - Direct DiaHing-In.
service [Telecommunication services]: That which
3.8
Recommendation 1.25 1.3 (1992), Number Identz$zation
is offered by a PISN Operator and/or owner to its customers
Supplementary Services - Calling Line Identijication
in Order to satisfy a specific telecommunication require-
Presentation.
ment.
Recommendation 1.25 1.5 (1992), Number Identifcation
Unless otherwise stated, the term “service” shall mean
Supplementary Services - Connected Line IdentiJcation
“bearer [telecommunication] service” .
Presentation (COLP).
3.9 User: An entity which uses telecommunication
Recommendation 1.520 (1992), General arrangements for
services offered by a network, and which therefore directly
network interworking between ISDNs.
or indirectly uses the services of the Network Layer.
Recommendation Q.65 (1992), Stage 2 of the method for
the characterisation of Services supported by an ISDN.
4 Symbols and abbreviations
Recommendation X.3 1 (1992), Support of packet-mode
terminal equiment by an ISDN
Clearing Cause
cc
Cal1 Control generic functional entity
cc [FE1
3 Definitions
CCA Cal1 Control Agent generic functional
entity
For the purpose of this International Standard, the follow-
ing definitions apply. For other terms used in this
confirmation
cfm 1 c
International Standard, the definitions in ISO/IEC 115794
CH Cal1 History
and ITU-T Rec. 1.112 apply.
Charme1 Identifier
CI
3.1 call: The instance of the use of a service.
CN Connected Number
3.2 intervening network (IVN): The generic term for
Connected Subaddress
CS
any real type of network which is employed for the provi-
sion of inter-PINX connections. CT Connection Type
DN Destination Number
3.3 mixed public/private ISDN: An Overall ISDN
which consists of any concatenation of public/private
DS Destination Subaddress
networks.
Gmctional entity
FE
NOTE7. Services are transparent to the users across public
HLC High Layer Compatibility
and private network components of a mixed public/private
network.
ind 1 i indication
3.4 network cal1 control entity: The collection of Integrated Services Digital Network
ISDN
network functions concemed with the control of Services,
ISO International Organisation for Standardi-
as opposed to functions concemed with the transfer of user
sation
information.
Low Layer Compatibility
LLC
Private Integrated Services Network (PISN): A
3.5
NC Number complete indication
private network. providing services to a specific set of
users. Originating Number
ON
NOTES OS Originating Subaddress
8. Contrary to a Public ISDN which provides Services to the OS1 Open Systems Interconnection
general public.
PINX Private Integrated Services Network
9. The term PISN covers more than a private ISDN. Exchange
PISN Private Integrated Services Network
3.6 Private Integrated Services Network Exchange
(PINX): A PISN nodal entity which provides automatic
Public Switched Telephone Network
PSTN
0 1s0/lEc ISO/IEC 11574: 1994 (E)
Rec. (ITU-T) Recommendation activation of supplementary Services on a per teleservice
basis, e.g., cal1 forwarding. Any use of this information by
request
req I rq
a PISN is outside the scope, but is not precluded by, this
resp 1 rs response
International Standard.
RT
Report Type
Annex B provides guidelines and additional information
which are appropriate for the teleservice, telephony.
SDL Specification and Description Language
TE
Terminal Equipment
5.3 Control and signalling
In Order for information transfer to take place, an informa-
5 Provision of Services by a PISN
tion connection must exist between the PISN users
concemed. A demand service involves the establishment
Basic services within a PISN consist of bearer services and
and release of information connections according to the
teleservices. A bearer service is defined only up to a certain
demands of users. From the point of view of users, calls
layer, in any case no higher than Layer 3. The definition of
have to be established and released, and this involves cal1
a teleservice also encompasses the higher layers up to
control functions. Cal1 control requires knowledge of the
Layer 7 (although some of the layers tan be empty or not
proper-Ges of the user information to be transferred in Order
specified, as with for example, Telephony).
to provide appropriate capabilities.
The basic services defined in this International Standard
In general, more than one network element (e.g., PINX,
correspond to the 64 kbit/s circuit-mode basic Services
terminal) is involved in a call, and therefore cal1 control is
defmed in ITU-T Recommendation 1.23 1.
distributed. Consequently cal1 control information needs to
be conveyed between network elements. The conveyance of
5.1 Bearer Services
this information is a function of signalling.
PISN circuit-mode bearer services provide a means of
PISN services use message based signalling information,
transferring information between users at the physical layer
which means that signalling information is carried over a
level. Service attributes above Layer 3 are not defined.
dedicated logical connection, separate from the connection
Consequently, the Provision of bearer services involves
established for conveying user information.
only low layer functions. A bearer service tan support a
NOTE 10 The possible use of the signalling connection also
variety of high layer protocols.
to provide user-tower infonnation transfer is the fknction of
A circuit-mode bearer service provides an end to end
the User-to-User Signalling supplementary Service, and is
connection (at the physical layer) for the conveyance of
outside the scope of this International Standard.
user information. Esch switching point intervenes only at
the physical layer. This gives a constant bit rate and fixed
54 . Interworking considerations
delays which are very close to the inherent delays of the
In general, interworking between a PISN bearer service
transmission media.
and a bearer service provided by another network requires
interworking functions, both for information transfer and
5.2 Teleservices
for signalling.
The provision of a teleservice involves high layer func-
When interworking with the same service in a public
tions, generally using the underlying low layer capabilities
ISDN, the interworking function for information transfer is
of a bearer service. A PISN tan support a teleservice by
null. However, interworking has an impact on signalling.
supporting a bearer service having the same capabilities as
those required by the teleservice and by satisfying any
5.5 Service model
special control requirements of the teleservice. The
Provision of high layer functions in support of a teleservice
This International Standard uses the following service
is not a necessary part of a PISN and is beyond the scope of
model in Order to specify services.
this International Standard.
The PISN provides bearer capabilities between end users
When requesting a teleservice from a PISN, the user has to
for the support of the bearer service requested by the user
explicitly indicate the bearer capabilities required in the
to support applications. The PISN user controls the bearer
Same way as when a bearer service is requested. In addi-
capabilities through the control plane. Coordination
tion, an indication of the teleservice required is provided by
between the bearer capabilities and the control plane is
the PISN User, primarily for passing the indication through
maintained by each PINX involved in the connection.
the network to the called PISN user in Order to allow
compatibility checking. A PISN tan optionally make use of The user terminal interfaces are identified by an address,
this information for purposes such as barring certain which in a PISN is defined by a PISN number or a
teleservices to certain PISN users, or for the Provision or concatenation of a number and a Subaddress.

ISO/IEC 11574: 1994 (E) 0 ISO/lEC
The control plane processes address information along used for specifying supplementary Services. Supplementary
with other parameters as necessary to effect the necessary services are not specified in this International Standard.
routeing. This International Standard views control
functions as services being provided by a Network Cal1
User User
Control entity, which are accessible through control service
access points. Coordination functions use the services of
the Network Cal1 Control entity when coordinating cal1
Network Cal1
SA?
SAP
control with the transfer of user information, thereby
Control Entity
providing bearer capability to PISN users. Unless explicitly ,
*
stated the terms “network” and “Network Cal1 Control
FE ’ FE - FE ’ FE
, .
Entity” are used interchangeably. See figure 1.
SAP = Service Access Point
User
User
Figure 2 - Generic model for Stage 2
I I
Network Call
SAP
SAP
Section 2 : Service Description, (Stage 1
Control Entity
description)
I
SAP = Service Access Point
6 Circuit-mode 64 kbith unrestricted 8 kIIz
structured bearer Service category
Figure 1 - Service model
6.1 Definition
This bearer Service category provides information transfer
The primitives used across Network Cal1 Control Service
at 64 kbit/s without alteration between PISN users. The
access points are as follows.
Service tan support various PISN user applications.
l SETUP request / indication / response / confirma-
Examples include:
tion; us&l for cal1 establishment.
l Speech (see Note 11);
l RELEASE request / indication / response / confir-
-
l 3,l & audio (see Note 11);
mation; used for cal1 rejection and release.
l multiple subrate information streams multiplexed
l REPORT request / indication; used for reporting to
into 64 kbit/s by the PISN User;
the calling User:
l transparent access to a public or private X.25
- that the cal1 is proceeding,
network (KU-T Rec. X.3 1 case A for access to a
- that the called PISN user is being alerted,
public X.25 network).
- the presence of in-band tones or announcements,
NOTE 11. Whilst Speech and 3,l kHz audio have been given
- as applications for this bearer Service, the PISN User should
of interworking situations, and
ensure that a compatible encoding scheme is in Operation. In
l INFORMATION request; used for providing addi-
-
any case, no network Provision tan be made for the control of
tional destination addressing information not
such items as echo and loss, as the network is unaware of the
provided with the SETUP request.
- application in use. Furthermore, the quality of service attribute
value for information transfer delay indicates the suitability of a
In the Stage 1 description, the control aspects of Services
particular version of this bearer Service for Speech
are specified in terms of the primitives listed above at the
communication.
Network Cal1 Control service access points. The entire
Network Cal1 Control is treated as a Single entity.
6.2 Description
In the Stage 2 description, the intemal behaviour of
This circuit-mode bearer Service category allows:
Network Cal1 Control is specified by breaking it down into
a number of Functional Entities (FE) and specifying the
l two PISN users to communicate in a point to point
information flows between them. The result is a model of
configuration via the network using 64 kbit/s digital
the form shown in figure 2. The particular model used for
Signals, in both directions continuously and simul-
the basic cal1 is specified in section 3 of this International
taneously for the duration of a call;
Standard. Other models based on this generic model are
ISO/IEC 11574: 1994 (E)
0 ISO/IEC
l in conjunction with a Conference cal1 supplementary a analogue network (e.g., PSTNs or private analog-ue
service, (the procedures of which are outside the networks). To effect a connection, the PISN should use a
scope of this International Standard) three or more 64 kbit/s unrestricted eonnection between its user and the
PISN users to communicate in a multipoint interworking function, and a 3,l kHz audio connection (or
equivalent) from the interworking unit to the analogue
configuration
network.
Once the information channel connection has been estab-
NOTE 12. If additional information conceming layer 1 proto-
lishecl according to the procedures described in clauses 9 to
cols is available, the PISN may provide the interworking
11, it is available for the transmission of 64 kbit/s digital
function.
Signals in both directions continuously and simultaneously,
without alteration by the network. The network shall place
In general, when a cal1 originates in an analogue network,
no restrictions on the content of the digital Signals.
the analogue network is unable to indicate to the PISN the
senke required. Ifthis is the case, the called PISN user is
offered a 3,l kHz audio bearer setice with an indication of
6.3 Procedures
such interworking.
These are common to all services in this International
NOTE 13. If at the called PISN user there is a terminal
Standard and are given in clause 9.
adaptor which is unable to accept an incoming 3,l kHz audio
cal1 but is able to accept an incoming 64 kbit/s unrestricted
6.4 Network capability for charging
call, the introduction of an interworking function in the PISN
tan be achieved only if there is Service negotiation between the
This is outside the scope of this International Standard.
PISN and the called terminal adaptor. This capability is outside
the scope of this International Standard.
65 . Interworking considerations
6.6 Static Description: Service Attributes
6.5.1 Interworking with a public ISDN and certain
other digital network
For details conceming the structuring of selvice attribute,
see Annex A.
Services in this category are able to interwork with the
Same Services in a public ISDN. The interworking function Dominant information transfer attributes
for user information transfer is null.
The dominant information transfer attribute values for
this service category shall be:
6.5.2 Interworking with networks supporting only a
restricted digital information transfer capa-
1) Information transfer mode: circuit;
bility
2) Information transfer rate: 64 kbit/s;
During an interim period, some other networks may only
3) Information transfer capability: unrestricted;
support restricted 64 kbit/s digital information transfer
information transfer capability solely 4) Structure: 8 kHz integrity.
capability, i.e.,
restricted by the requirement that the all-Zero octet is not
l Secondary information transfer attributes
allowed. Interworking tan be achieved according to the
The secondary information transfer attribute values for
rules given in Appendix 1 of ITU-T Rec. 1.520 (the PISN
this Service category shall be:
being treated as an ISDN with unrestricted 64 kbit/s
capability). The PISN shall assume that the intenvorking
Establishment of communication: demand or
5)
fknctions are provided in the other network. The PISN
reserved or permanent (see Note 14);
need not be tiected by this interworking, other than by
Symmetry: bidirectional symmetric or unidirec-
6)
conveying the appropriate signalling indication to and
tional (see Note 15);
from the User.
Communication configuration: point-to-point or
7)
6.5.3 Interworking with analogue networks
multi-point (see Note 16).
The PISN may support calls between data terminals and an
l Access attributes
analogue network. In this case the following procedures
The access attribute values for this sewice category
aPPlY*
shall be (see Note 17):
A V-series terminal1 shall be connected to the PISN via a
8) Access channel: B;
terminal adaptor. The PISN shall provide an interworking
function (including a modern) for calls to or from a user of
9) Access protocol: Not defined.
NOTES
1 Terminals that support certain ITU-T Recommendations
Only demand Services are specified in this International
14.
such as V.24, V.28, V.10 and V.11. Standard.
0 ISO/IEC
ISO/IEX 11574: 1994 (E)
15. Only bidirectional symmetric Services are specifkd in this
7.5 Interworking considerations
International Standard.
c1.5.1 Interworking with a public ISDN and certain
16. Only point-toopoint Services are specified in this
other Digital Networks
International Standard. Multipoint configurations tan be
achieved using Conference cal1 supplementary Services.
Services specified in this International Standard are able to
interwork with the same services in a public ISDN. The
17. The access attributes refer only to the user information
not the signalling information. interworking function for user information transfer is null.
7.5.2 Inter
...